QLibrary fails to load .so file - qt

I am trying to load a simple C based library interface that is contained of few functions, and compiled with qt as template lib. When I follow the standart way of loading the library, my QLibrary::load() fails. Here is the code:
bool RecPluginMngr::loadLibrary(const QString &src)
{
bool res = false;
static QLibrary plugin(src);
res = plugin.load();
if (!res) {
return res;
}
bool load_all_res = true;
RecIface iface;
iface.init = (init) plugin.resolve("init");
// todo: err messages !!!
if (iface.init == nullptr) {
load_all_res &= false;
}
iface.get_data = (get_data) plugin.resolve("get_data");
if (iface.get_data == nullptr) {
load_all_res &= false;
}
iface.put_data = (put_data) plugin.resolve("put_data");
if (iface.put_data == nullptr) {
load_all_res &= false;
}
iface.put_ndata = (put_ndata) plugin.resolve("put_ndata");
if (iface.put_ndata == nullptr) {
load_all_res &= false;
}
// map them all
m_plugins[src] = iface;
return load_all_res;
}

Related

QTreeView: column resize from columns and not from headers?

Is there any way to allow the user to interactively resize the columns when headers are hidden?

You can install an event filter on the table's viewport and implement needed behavior manually. Below is a sample implementation.
Header:
#include <QTableView>
class Table_cell_resizer : public QObject {
Q_OBJECT
public:
explicit Table_cell_resizer(QTableView *view = 0);
protected:
bool eventFilter(QObject* object, QEvent* event);
private:
QTableView* m_view;
//max distance between mouse and a cell, small enough to trigger resize
int m_sensibility;
//variables for saving state while dragging
bool m_drag_in_progress;
Qt::Orientation m_drag_orientation;
int m_drag_section;
int m_drag_previous_pos;
// check if mouse_pos is around right or bottom side of a cell
// (depending on orientation)
// and return the index of that cell if found
QModelIndex index_resizable(QPoint mouse_pos, Qt::Orientation orientation);
};
Source:
#include "Table_cell_resizer.h"
#include <QMouseEvent>
#include <QHeaderView>
Table_cell_resizer::Table_cell_resizer(QTableView* view) :
QObject(view), m_view(view)
{
m_view->viewport()->installEventFilter(this);
m_view->viewport()->setMouseTracking(true);
m_sensibility = 5;
m_drag_in_progress = false;
}
bool Table_cell_resizer::eventFilter(QObject* object, QEvent* event) {
if (object == m_view->viewport()) {
QMouseEvent* mouse_event = dynamic_cast<QMouseEvent*>(event);
if (mouse_event) {
if (mouse_event->type() == QEvent::MouseMove) {
if (m_drag_in_progress) { // apply dragging
int delta;
QHeaderView* header_view;
if (m_drag_orientation == Qt::Vertical) {
delta = mouse_event->pos().y() - m_drag_previous_pos;
header_view = m_view->verticalHeader();
m_drag_previous_pos = mouse_event->pos().y();
} else if (m_drag_orientation == Qt::Horizontal) {
delta = mouse_event->pos().x() - m_drag_previous_pos;
header_view = m_view->horizontalHeader();
m_drag_previous_pos = mouse_event->pos().x();
}
//using minimal size = m_sensibility * 2 to prevent collapsing
header_view->resizeSection(m_drag_section,
qMax(m_sensibility * 2, header_view->sectionSize(m_drag_section) + delta));
return true;
} else { // set mouse cursor shape
if (index_resizable(mouse_event->pos(), Qt::Vertical).isValid()) {
m_view->viewport()->setCursor(Qt::SplitVCursor);
} else if (index_resizable(mouse_event->pos(), Qt::Horizontal).isValid()) {
m_view->viewport()->setCursor(Qt::SplitHCursor);
} else {
m_view->viewport()->setCursor(QCursor());
}
}
} else if (mouse_event->type() == QEvent::MouseButtonPress &&
mouse_event->button() == Qt::LeftButton &&
!m_drag_in_progress) { // start dragging
if (index_resizable(mouse_event->pos(), Qt::Vertical).isValid()) {
m_drag_in_progress = true;
m_drag_orientation = Qt::Vertical;
m_drag_previous_pos = mouse_event->y();
m_drag_section = index_resizable(mouse_event->pos(), Qt::Vertical).row();
return true;
} else if (index_resizable(mouse_event->pos(), Qt::Horizontal).isValid()) {
m_drag_in_progress = true;
m_drag_orientation = Qt::Horizontal;
m_drag_previous_pos = mouse_event->x();
m_drag_section = index_resizable(mouse_event->pos(), Qt::Horizontal).column();
return true;
}
} else if (mouse_event->type() == QEvent::MouseButtonRelease &&
mouse_event->button() == Qt::LeftButton &&
m_drag_in_progress) { // stop dragging
m_drag_in_progress = false;
return true;
}
}
}
return false;
}
QModelIndex Table_cell_resizer::index_resizable(QPoint mouse_pos, Qt::Orientation orientation) {
QModelIndex index = m_view->indexAt(mouse_pos - QPoint(m_sensibility + 1, m_sensibility + 1));
if (index.isValid()) {
if (orientation == Qt::Horizontal) {
if (qAbs(m_view->visualRect(index).right() - mouse_pos.x()) < m_sensibility &&
m_view->horizontalHeader()->sectionResizeMode(index.column()) == QHeaderView::Interactive) {
return index;
}
} else {
if (qAbs(m_view->visualRect(index).bottom() - mouse_pos.y()) < m_sensibility &&
m_view->verticalHeader()->sectionResizeMode(index.row()) == QHeaderView::Interactive) {
return index;
}
}
}
return QModelIndex();
}
Usage:
new Table_cell_resizer(ui->table);
User can now resize rows and columns using cell area in addition to header areas. You can hide headers if you wish. This implementation respects header resize modes, so make sure that resize mode is set to QHeaderView::Interactive for headers which you want to be resizable. For example, you can set horizontal header mode to Interactive and vertical header mode to Fixed, resulting in resizable columns and fixed rows.

CutyCapt not able to generate HTTPS web site screenshot when launched from w3wp.exe

I have updated the latest code from SVN and complie CutyCapt with Qt SDK 4.8.
And I have static-linked libeay32.dll / ssleay32.dll in the same location of the binary.
It works fine if I launch the CutyCapt process in command window.
It works fine if I launch the CutyCapt process from ASP.NET (w3wp) to capture HTTP web page.
it does NOT work if I launch the CutyCapt process from ASP.NET (w3wp) to capture HTTPS web page, always generates a blank image.
I doubted it was because the libeay32.dll / ssleay32.dll dependencies are not loaded, so I copied these 2 dll to system32 / SysWOW64, this does not resolve my problem.
Then I monitor the process by ProcessMonitor, it shows me that libeay32.dll / ssleay32.dll are loaded successfully.
So, the dependencies are not the reason.
Here is my C# code to launch the CutyCapt,
using (Process process = new Process())
{
process.StartInfo.FileName = ti.ExeFile;
process.StartInfo.ErrorDialog = false;
process.StartInfo.CreateNoWindow = true;
process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
process.StartInfo.WorkingDirectory = Path.GetDirectoryName(ti.ExeFile);
process.StartInfo.UseShellExecute = false;
process.StartInfo.Arguments = string.Format(#"--min-width=1024 --delay=1500 --javascript=off --auto-load-images=on --plugins=off --java=off --url={0} --out={1}"
, ti.Url
, destFile
);
process.Start();
process.WaitForExit();
process.Close();
}
Does anyone knows how to allow CutyCapt works from w3wp?

SOLUTION:
I have resolved this problem by modifying the CutyCapt source.
The idea is that, get the HTML of the url then set the HTML to the WebKit.
CutyCapt.hpp
#include <QtWebKit>
class CutyCapt;
class CutyPage : public QWebPage {
Q_OBJECT
public:
void setAttribute(QWebSettings::WebAttribute option, const QString& value);
void setUserAgent(const QString& userAgent);
void setAlertString(const QString& alertString);
void setPrintAlerts(bool printAlerts);
void setCutyCapt(CutyCapt* cutyCapt);
QString getAlertString();
protected:
QString chooseFile(QWebFrame *frame, const QString& suggestedFile);
void javaScriptConsoleMessage(const QString& message, int lineNumber, const QString& sourceID);
bool javaScriptPrompt(QWebFrame* frame, const QString& msg, const QString& defaultValue, QString* result);
void javaScriptAlert(QWebFrame* frame, const QString& msg);
bool javaScriptConfirm(QWebFrame* frame, const QString& msg);
QString userAgentForUrl(const QUrl& url) const;
QString mUserAgent;
QString mAlertString;
bool mPrintAlerts;
CutyCapt* mCutyCapt;
};
class CutyCapt : public QObject {
Q_OBJECT
public:
QString mUrl;
// TODO: This should really be elsewhere and be named differently
enum OutputFormat { SvgFormat, PdfFormat, PsFormat, InnerTextFormat, HtmlFormat,
RenderTreeFormat, PngFormat, JpegFormat, MngFormat, TiffFormat, GifFormat,
BmpFormat, PpmFormat, XbmFormat, XpmFormat, OtherFormat };
CutyCapt(CutyPage* page,
const QString& output,
int delay,
OutputFormat format,
const QString& scriptProp,
const QString& scriptCode);
private slots:
void HtmlDownloadFinished(QNetworkReply * reply);
void HtmlDownloadError(QNetworkReply::NetworkError code);
void DocumentComplete(bool ok);
void InitialLayoutCompleted();
void JavaScriptWindowObjectCleared();
void Timeout();
void Delayed();
private:
void TryDelayedRender();
void saveSnapshot();
bool mSawInitialLayout;
bool mSawDocumentComplete;
protected:
QString mOutput;
int mDelay;
CutyPage* mPage;
OutputFormat mFormat;
QObject* mScriptObj;
QString mScriptProp;
QString mScriptCode;
};
CutyCapt.cpp
////////////////////////////////////////////////////////////////////
//
// CutyCapt - A Qt WebKit Web Page Rendering Capture Utility
//
// Copyright (C) 2003-2010 Bjoern Hoehrmann <bjoern#hoehrmann.de>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// $Id: CutyCapt.cpp 7 2011-11-30 10:56:34Z hoehrmann $
//
////////////////////////////////////////////////////////////////////
#include <QApplication>
#include <QtWebKit>
#include <QtGui>
#include <QSvgGenerator>
#include <QPrinter>
#include <QTimer>
#include <QByteArray>
#include <QNetworkRequest>
#include <QtCore>
#include "CutyCapt.hpp"
#if QT_VERSION >= 0x040600 && 0
#define CUTYCAPT_SCRIPT 1
#endif
#ifdef STATIC_PLUGINS
Q_IMPORT_PLUGIN(qjpeg)
Q_IMPORT_PLUGIN(qgif)
Q_IMPORT_PLUGIN(qtiff)
Q_IMPORT_PLUGIN(qsvg)
Q_IMPORT_PLUGIN(qmng)
Q_IMPORT_PLUGIN(qico)
#endif
static struct _CutyExtMap {
CutyCapt::OutputFormat id;
const char* extension;
const char* identifier;
} const CutyExtMap[] = {
{ CutyCapt::SvgFormat, ".svg", "svg" },
{ CutyCapt::PdfFormat, ".pdf", "pdf" },
{ CutyCapt::PsFormat, ".ps", "ps" },
{ CutyCapt::InnerTextFormat, ".txt", "itext" },
{ CutyCapt::HtmlFormat, ".html", "html" },
{ CutyCapt::RenderTreeFormat, ".rtree", "rtree" },
{ CutyCapt::JpegFormat, ".jpeg", "jpeg" },
{ CutyCapt::PngFormat, ".png", "png" },
{ CutyCapt::MngFormat, ".mng", "mng" },
{ CutyCapt::TiffFormat, ".tiff", "tiff" },
{ CutyCapt::GifFormat, ".gif", "gif" },
{ CutyCapt::BmpFormat, ".bmp", "bmp" },
{ CutyCapt::PpmFormat, ".ppm", "ppm" },
{ CutyCapt::XbmFormat, ".xbm", "xbm" },
{ CutyCapt::XpmFormat, ".xpm", "xpm" },
{ CutyCapt::OtherFormat, "", "" }
};
QString
CutyPage::chooseFile(QWebFrame* /*frame*/, const QString& /*suggestedFile*/) {
return QString::null;
}
bool
CutyPage::javaScriptConfirm(QWebFrame* /*frame*/, const QString& /*msg*/) {
return true;
}
bool
CutyPage::javaScriptPrompt(QWebFrame* /*frame*/,
const QString& /*msg*/,
const QString& /*defaultValue*/,
QString* /*result*/) {
return true;
}
void
CutyPage::javaScriptConsoleMessage(const QString& /*message*/,
int /*lineNumber*/,
const QString& /*sourceID*/) {
// noop
}
void
CutyPage::javaScriptAlert(QWebFrame* /*frame*/, const QString& msg) {
if (mPrintAlerts)
qDebug() << "[alert]" << msg;
if (mAlertString == msg) {
QTimer::singleShot(10, mCutyCapt, SLOT(Delayed()));
}
}
QString
CutyPage::userAgentForUrl(const QUrl& url) const {
if (!mUserAgent.isNull())
return mUserAgent;
return QWebPage::userAgentForUrl(url);
}
void
CutyPage::setUserAgent(const QString& userAgent) {
mUserAgent = userAgent;
}
void
CutyPage::setAlertString(const QString& alertString) {
mAlertString = alertString;
}
QString
CutyPage::getAlertString() {
return mAlertString;
}
void
CutyPage::setCutyCapt(CutyCapt* cutyCapt) {
mCutyCapt = cutyCapt;
}
void
CutyPage::setPrintAlerts(bool printAlerts) {
mPrintAlerts = printAlerts;
}
void
CutyPage::setAttribute(QWebSettings::WebAttribute option,
const QString& value) {
if (value == "on")
settings()->setAttribute(option, true);
else if (value == "off")
settings()->setAttribute(option, false);
else
(void)0; // TODO: ...
}
// TODO: Consider merging some of main() and CutyCap
CutyCapt::CutyCapt(CutyPage* page, const QString& output, int delay, OutputFormat format,
const QString& scriptProp, const QString& scriptCode) {
mPage = page;
mOutput = output;
mDelay = delay;
mSawInitialLayout = false;
mSawDocumentComplete = false;
mFormat = format;
mScriptProp = scriptProp;
mScriptCode = scriptCode;
mScriptObj = new QObject();
// This is not really nice, but some restructuring work is
// needed anyway, so this should not be that bad for now.
mPage->setCutyCapt(this);
}
void
CutyCapt::InitialLayoutCompleted() {
mSawInitialLayout = true;
if (mSawInitialLayout && mSawDocumentComplete)
TryDelayedRender();
}
void
CutyCapt::DocumentComplete(bool /*ok*/) {
mSawDocumentComplete = true;
if (mSawInitialLayout && mSawDocumentComplete)
TryDelayedRender();
}
void
CutyCapt::JavaScriptWindowObjectCleared() {
if (!mScriptProp.isEmpty()) {
QVariant var = mPage->mainFrame()->evaluateJavaScript(mScriptProp);
QObject* obj = var.value<QObject*>();
if (obj == mScriptObj)
return;
mPage->mainFrame()->addToJavaScriptWindowObject(mScriptProp, mScriptObj);
}
mPage->mainFrame()->evaluateJavaScript(mScriptCode);
}
void CutyCapt::HtmlDownloadFinished(QNetworkReply * reply)
{
QVariant statusCode = reply->attribute( QNetworkRequest::HttpStatusCodeAttribute );
qDebug() << statusCode;
if ( !statusCode.isValid() )
{
QApplication::exit();
return;
}
int status = statusCode.toInt();
if( status == 301 || status == 302 )
{
QVariant loc = reply->header(QNetworkRequest::LocationHeader);
qDebug() << "Location :" << loc.toString();
QApplication::exit();
return;
}
if ( status != 200 )
{
QString reason = reply->attribute( QNetworkRequest::HttpReasonPhraseAttribute ).toString();
qDebug() << reason;
QApplication::exit();
return;
}
QString html=QString::fromUtf8(reply->readAll());
mPage->mainFrame()->setHtml( html, QUrl(mUrl) );
}
void CutyCapt::HtmlDownloadError(QNetworkReply::NetworkError code)
{
QApplication::exit();
}
void
CutyCapt::TryDelayedRender() {
if (!mPage->getAlertString().isEmpty())
return;
if (mDelay > 0) {
QTimer::singleShot(mDelay, this, SLOT(Delayed()));
return;
}
saveSnapshot();
QApplication::exit();
}
void
CutyCapt::Timeout() {
saveSnapshot();
QApplication::exit();
}
void
CutyCapt::Delayed() {
saveSnapshot();
QApplication::exit();
}
void
CutyCapt::saveSnapshot() {
QWebFrame *mainFrame = mPage->mainFrame();
QPainter painter;
const char* format = NULL;
for (int ix = 0; CutyExtMap[ix].id != OtherFormat; ++ix)
if (CutyExtMap[ix].id == mFormat)
format = CutyExtMap[ix].identifier; //, break;
// TODO: sometimes contents/viewport can have size 0x0
// in which case saving them will fail. This is likely
// the result of the method being called too early. So
// far I've been unable to find a workaround, except
// using --delay with some substantial wait time. I've
// tried to resize multiple time, make a fake render,
// check for other events... This is primarily a problem
// under my Ubuntu virtual machine.
mPage->setViewportSize( mainFrame->contentsSize() );
switch (mFormat) {
case SvgFormat: {
QSvgGenerator svg;
svg.setFileName(mOutput);
svg.setSize(mPage->viewportSize());
painter.begin(&svg);
mainFrame->render(&painter);
painter.end();
break;
}
case PdfFormat:
case PsFormat: {
QPrinter printer;
printer.setPageSize(QPrinter::A4);
printer.setOutputFileName(mOutput);
// TODO: change quality here?
mainFrame->print(&printer);
break;
}
case RenderTreeFormat:
case InnerTextFormat:
case HtmlFormat: {
QFile file(mOutput);
file.open(QIODevice::WriteOnly | QIODevice::Text);
QTextStream s(&file);
s.setCodec("utf-8");
s << (mFormat == RenderTreeFormat ? mainFrame->renderTreeDump() :
mFormat == InnerTextFormat ? mainFrame->toPlainText() :
mFormat == HtmlFormat ? mainFrame->toHtml() :
"bug");
break;
}
default: {
QImage image(mPage->viewportSize(), QImage::Format_ARGB32);
painter.begin(&image);
mainFrame->render(&painter);
painter.end();
// TODO: add quality
image.save(mOutput, format);
}
};
}
void
CaptHelp(void) {
printf("%s",
" -----------------------------------------------------------------------------\n"
" Usage: CutyCapt --url=http://www.example.org/ --out=localfile.png \n"
" -----------------------------------------------------------------------------\n"
" --help Print this help page and exit \n"
" --url=<url> The URL to capture (http:...|file:...|...) \n"
" --out=<path> The target file (.png|pdf|ps|svg|jpeg|...) \n"
" --out-format=<f> Like extension in --out, overrides heuristic \n"
// " --out-quality=<int> Output format quality from 1 to 100 \n"
" --min-width=<int> Minimal width for the image (default: 800) \n"
" --min-height=<int> Minimal height for the image (default: 600) \n"
" --max-wait=<ms> Don't wait more than (default: 90000, inf: 0)\n"
" --delay=<ms> After successful load, wait (default: 0) \n"
// " --user-styles=<url> Location of user style sheet (deprecated) \n"
" --user-style-path=<path> Location of user style sheet file, if any \n"
" --user-style-string=<css> User style rules specified as text \n"
" --header=<name>:<value> request header; repeatable; some can't be set\n"
" --method=<get|post|put> Specifies the request method (default: get) \n"
" --body-string=<string> Unencoded request body (default: none) \n"
" --body-base64=<base64> Base64-encoded request body (default: none) \n"
" --app-name=<name> appName used in User-Agent; default is none \n"
" --app-version=<version> appVers used in User-Agent; default is none \n"
" --user-agent=<string> Override the User-Agent header Qt would set \n"
" --javascript=<on|off> JavaScript execution (default: on) \n"
" --java=<on|off> Java execution (default: unknown) \n"
" --plugins=<on|off> Plugin execution (default: unknown) \n"
" --private-browsing=<on|off> Private browsing (default: unknown) \n"
" --auto-load-images=<on|off> Automatic image loading (default: on) \n"
" --js-can-open-windows=<on|off> Script can open windows? (default: unknown) \n"
" --js-can-access-clipboard=<on|off> Script clipboard privs (default: unknown)\n"
#if QT_VERSION >= 0x040500
" --print-backgrounds=<on|off> Backgrounds in PDF/PS output (default: off) \n"
" --zoom-factor=<float> Page zoom factor (default: no zooming) \n"
" --zoom-text-only=<on|off> Whether to zoom only the text (default: off) \n"
" --http-proxy=<url> Address for HTTP proxy server (default: none)\n"
#endif
#if CUTYCAPT_SCRIPT
" --inject-script=<path> JavaScript that will be injected into pages \n"
" --script-object=<string> Property to hold state for injected script \n"
" --expect-alert=<string> Try waiting for alert(string) before capture \n"
" --debug-print-alerts Prints out alert(...) strings for debugging. \n"
#endif
" -----------------------------------------------------------------------------\n"
" <f> is svg,ps,pdf,itext,html,rtree,png,jpeg,mng,tiff,gif,bmp,ppm,xbm,xpm \n"
" -----------------------------------------------------------------------------\n"
#if CUTYCAPT_SCRIPT
" The `inject-script` option can be used to inject script code into loaded web \n"
" pages. The code is called whenever the `javaScriptWindowObjectCleared` signal\n"
" is received. When `script-object` is set, an object under the specified name \n"
" will be available to the script to maintain state across page loads. When the\n"
" `expect-alert` option is specified, the shot will be taken when a script in- \n"
" vokes alert(string) with the string if that happens before `max-wait`. These \n"
" options effectively allow you to remote control the browser and the web page.\n"
" This an experimental and easily abused and misused feature. Use with caution.\n"
" -----------------------------------------------------------------------------\n"
#endif
" http://cutycapt.sf.net - (c) 2003-2010 Bjoern Hoehrmann - bjoern#hoehrmann.de\n"
"");
}
int
main(int argc, char *argv[]) {
int argHelp = 0;
int argDelay = 0;
int argSilent = 0;
int argMinWidth = 800;
int argMinHeight = 600;
int argMaxWait = 90000;
int argVerbosity = 0;
const char* argUrl = NULL;
const char* argUserStyle = NULL;
const char* argUserStylePath = NULL;
const char* argUserStyleString = NULL;
const char* argIconDbPath = NULL;
const char* argInjectScript = NULL;
const char* argScriptObject = NULL;
QString argOut;
CutyCapt::OutputFormat format = CutyCapt::OtherFormat;
QApplication app(argc, argv, true);
CutyPage page;
QNetworkAccessManager::Operation method =
QNetworkAccessManager::GetOperation;
QByteArray body;
QNetworkRequest req;
QNetworkAccessManager manager;
// Parse command line parameters
for (int ax = 1; ax < argc; ++ax) {
size_t nlen;
const char* s = argv[ax];
const char* value;
// boolean options
if (strcmp("--silent", s) == 0) {
argSilent = 1;
continue;
} else if (strcmp("--help", s) == 0) {
argHelp = 1;
break;
} else if (strcmp("--verbose", s) == 0) {
argVerbosity++;
continue;
#if CUTYCAPT_SCRIPT
} else if (strcmp("--debug-print-alerts", s) == 0) {
page.setPrintAlerts(true);
continue;
#endif
}
value = strchr(s, '=');
if (value == NULL) {
// TODO: error
argHelp = 1;
break;
}
nlen = value++ - s;
// --name=value options
if (strncmp("--url", s, nlen) == 0) {
argUrl = value;
} else if (strncmp("--min-width", s, nlen) == 0) {
// TODO: add error checking here?
argMinWidth = (unsigned int)atoi(value);
} else if (strncmp("--min-height", s, nlen) == 0) {
// TODO: add error checking here?
argMinHeight = (unsigned int)atoi(value);
} else if (strncmp("--delay", s, nlen) == 0) {
// TODO: see above
argDelay = (unsigned int)atoi(value);
} else if (strncmp("--max-wait", s, nlen) == 0) {
// TODO: see above
argMaxWait = (unsigned int)atoi(value);
} else if (strncmp("--out", s, nlen) == 0) {
argOut = value;
if (format == CutyCapt::OtherFormat)
for (int ix = 0; CutyExtMap[ix].id != CutyCapt::OtherFormat; ++ix)
if (argOut.endsWith(CutyExtMap[ix].extension))
format = CutyExtMap[ix].id; //, break;
} else if (strncmp("--user-styles", s, nlen) == 0) {
// This option is provided for backwards-compatibility only
argUserStyle = value;
} else if (strncmp("--user-style-path", s, nlen) == 0) {
argUserStylePath = value;
} else if (strncmp("--user-style-string", s, nlen) == 0) {
argUserStyleString = value;
} else if (strncmp("--icon-database-path", s, nlen) == 0) {
argIconDbPath = value;
} else if (strncmp("--auto-load-images", s, nlen) == 0) {
page.setAttribute(QWebSettings::AutoLoadImages, value);
} else if (strncmp("--javascript", s, nlen) == 0) {
page.setAttribute(QWebSettings::JavascriptEnabled, value);
} else if (strncmp("--java", s, nlen) == 0) {
page.setAttribute(QWebSettings::JavaEnabled, value);
} else if (strncmp("--plugins", s, nlen) == 0) {
page.setAttribute(QWebSettings::PluginsEnabled, value);
} else if (strncmp("--private-browsing", s, nlen) == 0) {
page.setAttribute(QWebSettings::PrivateBrowsingEnabled, value);
} else if (strncmp("--js-can-open-windows", s, nlen) == 0) {
page.setAttribute(QWebSettings::JavascriptCanOpenWindows, value);
} else if (strncmp("--js-can-access-clipboard", s, nlen) == 0) {
page.setAttribute(QWebSettings::JavascriptCanAccessClipboard, value);
} else if (strncmp("--developer-extras", s, nlen) == 0) {
page.setAttribute(QWebSettings::DeveloperExtrasEnabled, value);
} else if (strncmp("--links-included-in-focus-chain", s, nlen) == 0) {
page.setAttribute(QWebSettings::LinksIncludedInFocusChain, value);
#if QT_VERSION >= 0x040500
} else if (strncmp("--print-backgrounds", s, nlen) == 0) {
page.setAttribute(QWebSettings::PrintElementBackgrounds, value);
} else if (strncmp("--zoom-factor", s, nlen) == 0) {
page.mainFrame()->setZoomFactor(QString(value).toFloat());
} else if (strncmp("--zoom-text-only", s, nlen) == 0) {
page.setAttribute(QWebSettings::ZoomTextOnly, value);
} else if (strncmp("--http-proxy", s, nlen) == 0) {
QUrl p = QUrl::fromEncoded(value);
QNetworkProxy proxy = QNetworkProxy(QNetworkProxy::HttpProxy,
p.host(), p.port(80), p.userName(), p.password());
manager.setProxy(proxy);
page.setNetworkAccessManager(&manager);
#endif
#if CUTYCAPT_SCRIPT
} else if (strncmp("--inject-script", s, nlen) == 0) {
argInjectScript = value;
} else if (strncmp("--script-object", s, nlen) == 0) {
argScriptObject = value;
} else if (strncmp("--expect-alert", s, nlen) == 0) {
page.setAlertString(value);
#endif
} else if (strncmp("--app-name", s, nlen) == 0) {
app.setApplicationName(value);
} else if (strncmp("--app-version", s, nlen) == 0) {
app.setApplicationVersion(value);
} else if (strncmp("--body-base64", s, nlen) == 0) {
body = QByteArray::fromBase64(value);
} else if (strncmp("--body-string", s, nlen) == 0) {
body = QByteArray(value);
} else if (strncmp("--user-agent", s, nlen) == 0) {
page.setUserAgent(value);
} else if (strncmp("--out-format", s, nlen) == 0) {
for (int ix = 0; CutyExtMap[ix].id != CutyCapt::OtherFormat; ++ix)
if (strcmp(value, CutyExtMap[ix].identifier) == 0)
format = CutyExtMap[ix].id; //, break;
if (format == CutyCapt::OtherFormat) {
// TODO: error
argHelp = 1;
break;
}
} else if (strncmp("--header", s, nlen) == 0) {
const char* hv = strchr(value, ':');
if (hv == NULL) {
// TODO: error
argHelp = 1;
break;
}
req.setRawHeader(QByteArray(value, hv - value), hv + 1);
} else if (strncmp("--method", s, nlen) == 0) {
if (strcmp("value", "get") == 0)
method = QNetworkAccessManager::GetOperation;
else if (strcmp("value", "put") == 0)
method = QNetworkAccessManager::PutOperation;
else if (strcmp("value", "post") == 0)
method = QNetworkAccessManager::PostOperation;
else if (strcmp("value", "head") == 0)
method = QNetworkAccessManager::HeadOperation;
else
(void)0; // TODO: ...
} else {
// TODO: error
argHelp = 1;
}
}
if (argUrl == NULL || argOut == NULL || argHelp) {
CaptHelp();
return EXIT_FAILURE;
}
// This used to use QUrl(argUrl) but that escapes %hh sequences
// even though it should not, as URLs can assumed to be escaped.
req.setUrl( QUrl::fromEncoded(argUrl) );
QString scriptProp(argScriptObject);
QString scriptCode;
if (argInjectScript) {
QFile file(argInjectScript);
if (file.open(QIODevice::ReadOnly)) {
QTextStream stream(&file);
stream.setCodec(QTextCodec::codecForName("UTF-8"));
stream.setAutoDetectUnicode(true);
scriptCode = stream.readAll();
file.close();
}
}
CutyCapt main(&page, argOut, argDelay, format, scriptProp, scriptCode);
main.mUrl = argUrl;
app.connect(&page,
SIGNAL(loadFinished(bool)),
&main,
SLOT(DocumentComplete(bool)));
app.connect(page.mainFrame(),
SIGNAL(initialLayoutCompleted()),
&main,
SLOT(InitialLayoutCompleted()));
if (argMaxWait > 0) {
// TODO: Should this also register one for the application?
QTimer::singleShot(argMaxWait, &main, SLOT(Timeout()));
}
if (argUserStyle != NULL)
// TODO: does this need any syntax checking?
page.settings()->setUserStyleSheetUrl( QUrl::fromEncoded(argUserStyle) );
if (argUserStylePath != NULL) {
page.settings()->setUserStyleSheetUrl( QUrl::fromLocalFile(argUserStylePath) );
}
if (argUserStyleString != NULL) {
QUrl data("data:text/css;charset=utf-8;base64," +
QByteArray(argUserStyleString).toBase64());
page.settings()->setUserStyleSheetUrl( data );
}
if (argIconDbPath != NULL)
// TODO: does this need any syntax checking?
page.settings()->setIconDatabasePath(argUserStyle);
// The documentation does not say, but it seems the mainFrame
// will never change, so we can set this here. Otherwise we'd
// have to set this in snapshot and trigger an update, which
// is not currently possible (Qt 4.4.0) as far as I can tell.
page.mainFrame()->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
page.mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
page.setViewportSize( QSize(argMinWidth, argMinHeight) );
#if CUTYCAPT_SCRIPT
// javaScriptWindowObjectCleared does not get called on the
// initial load unless some JavaScript has been executed.
page.mainFrame()->evaluateJavaScript(QString(""));
app.connect(page.mainFrame(),
SIGNAL(javaScriptWindowObjectCleared()),
&main,
SLOT(JavaScriptWindowObjectCleared()));
#endif
app.connect( &manager,SIGNAL(finished(QNetworkReply *)), &main,SLOT(HtmlDownloadFinished(QNetworkReply *)));
QNetworkReply *reply = manager.get(req);
app.connect( reply,SIGNAL(error(QNetworkReply::NetworkError)), &main,SLOT(HtmlDownloadError(QNetworkReply::NetworkError)));
return app.exec();
}

QSignalSpy to capture a reference argument

It is not possible to capture an argument that has been passed as reference with a QSignalSpy:
QSignalSpy spy( myObject, SIGNAL(foo(int&)));
...
int& i=spy.at(0).at(0).value<int&>();
Since a QVariant can not contain a reference member. Plain logic.
But are there other solutions to check the passed-in argument?

Since Qt 5, we can simply connect to a lambda function, which makes the use of the QSignalSpy unnecessary:
std::vector<Value> values;
QObject::connect(myObject, &MyObject::foo,
[&](const auto &value)
{ values.emplace_back(value); });
myObject.somethingCausingFoo();
ASSERT_EQ(1u, values.size());
EXPECT_EQ(expectedValue, values.at(0));

An "ugly solution" would be to hack the fairly simple QSignalSpy code in order to handle the reference passed arguments. I provide a minimal working example for int reference arguments. The only changes were made to initArgs and appendArgs functions.
Notice that with this approach you will only be able to check the value of the passed argument by reference. You will not be able to change it's value.
In the initArgs function we check if we have references by argument and we populate the shouldreinterpret list.
void initArgs(const QMetaMethod &member)
{
QList<QByteArray> params = member.parameterTypes();
for (int i = 0; i < params.count(); ++i) {
int tp = QMetaType::type(params.at(i).constData());
if (tp == QMetaType::Void)
{
qWarning("Don't know how to handle '%s', use qRegisterMetaType to register it.",
params.at(i).constData());
// Check if we have a reference by removing the & from the parameter name
QString argString(params.at(i).constData());
argString.remove("&");
tp = QMetaType::type(argString.toStdString().c_str());
if (tp != QMetaType::Void)
shouldReinterpret << true;
}
else
shouldReinterpret << false;
args << tp;
}
}
and the appendArgs function, where we reinterpret the passed by reference arguments:
void appendArgs(void **a)
{
QList<QVariant> list;
for (int i = 0; i < args.count(); ++i) {
QMetaType::Type type = static_cast<QMetaType::Type>(args.at(i));
if (shouldReinterpret.at(i))
{
switch (type)
{
case QMetaType::Int:
list << QVariant(type, &(*reinterpret_cast<int*>(a[i + 1])));
break;
// Do the same for other types
}
}
else
list << QVariant(type, a[i + 1]);
}
append(list);
}
Complete code for reference:
class MySignalSpy: public QObject, public QList<QList<QVariant> >
{
public:
MySignalSpy(QObject *obj, const char *aSignal)
{
#ifdef Q_CC_BOR
const int memberOffset = QObject::staticMetaObject.methodCount();
#else
static const int memberOffset = QObject::staticMetaObject.methodCount();
#endif
Q_ASSERT(obj);
Q_ASSERT(aSignal);
if (((aSignal[0] - '0') & 0x03) != QSIGNAL_CODE) {
qWarning("QSignalSpy: Not a valid signal, use the SIGNAL macro");
return;
}
QByteArray ba = QMetaObject::normalizedSignature(aSignal + 1);
const QMetaObject *mo = obj->metaObject();
int sigIndex = mo->indexOfMethod(ba.constData());
if (sigIndex < 0) {
qWarning("QSignalSpy: No such signal: '%s'", ba.constData());
return;
}
if (!QMetaObject::connect(obj, sigIndex, this, memberOffset,
Qt::DirectConnection, 0)) {
qWarning("QSignalSpy: QMetaObject::connect returned false. Unable to connect.");
return;
}
sig = ba;
initArgs(mo->method(sigIndex));
}
inline bool isValid() const { return !sig.isEmpty(); }
inline QByteArray signal() const { return sig; }
int qt_metacall(QMetaObject::Call call, int methodId, void **a)
{
methodId = QObject::qt_metacall(call, methodId, a);
if (methodId < 0)
return methodId;
if (call == QMetaObject::InvokeMetaMethod) {
if (methodId == 0) {
appendArgs(a);
}
--methodId;
}
return methodId;
}
private:
void initArgs(const QMetaMethod &member)
{
QList<QByteArray> params = member.parameterTypes();
for (int i = 0; i < params.count(); ++i) {
int tp = QMetaType::type(params.at(i).constData());
if (tp == QMetaType::Void)
{
qWarning("Don't know how to handle '%s', use qRegisterMetaType to register it.",
params.at(i).constData());
QString argString(params.at(i).constData());
argString.remove("&");
tp = QMetaType::type(argString.toStdString().c_str());
if (tp != QMetaType::Void)
shouldReinterpret << true;
}
else
shouldReinterpret << false;
args << tp;
}
}
void appendArgs(void **a)
{
QList<QVariant> list;
for (int i = 0; i < args.count(); ++i) {
QMetaType::Type type = static_cast<QMetaType::Type>(args.at(i));
if (shouldReinterpret.at(i))
{
switch (type)
{
case QMetaType::Int:
int k = (*reinterpret_cast<int*>(a[i + 1]));
list << QVariant(type, &k);
break;
}
}
else
list << QVariant(type, a[i + 1]);
}
append(list);
}
// the full, normalized signal name
QByteArray sig;
// holds the QMetaType types for the argument list of the signal
QList<int> args;
// Holds the indexes of the arguments that
QList<bool> shouldReinterpret;
};

No Keyboard input if QLineEdit on frameless popup window

When a parent widget is defined with:
setWindowFlags(Qt::FramelessWindowHint | Qt::Popup);
Any edit box widget placed on top of it will not receive keyboard input. Mouse will work, right click, context menu, paste will work -- but not direct keyboard input. Any ideas why and how it can be fixed?

As I mentioned previously in a comment I had the same problem but now it is fixed with the following code:
// virtual override
void MyDialog::showEvent( QShowEvent* aShowEvent )
{
QDialog::showEvent( aShowEvent );
activateWindow();
}
After I added the activateWindow() function call I could use QLineEdit on my popup dialog.
I use Visual Studio 2013 and Qt 5.4.1 on Windows 8.1.

#include "StdAfx.h"
#include "qfindedit.h"
QFindEdit::QFindEdit(QWidget *parent)
: QLineEdit(parent)
, m_bEditFocus(true)
{
setPlaceholderText("please input find word");
m_stringListmodel = new QStringListModel(this);
m_pFindWnd = new QListView(this);
//m_pFindWnd->setWindowFlags(Qt::Popup);
m_pFindWnd->setEditTriggers(QAbstractItemView::NoEditTriggers);
m_pFindWnd->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
m_pFindWnd->setSelectionBehavior(QAbstractItemView::SelectRows);
m_pFindWnd->setSelectionMode(QAbstractItemView::SingleSelection);
m_pFindWnd->setParent(0, Qt::Popup);
m_pFindWnd->setFocusPolicy(Qt::NoFocus);
m_pFindWnd->setFocusProxy(this);
connect(this, SIGNAL(textEdited(const QString&)), this, SLOT(textEditedSlot(const QString&)));
QObject::connect(m_pFindWnd, SIGNAL(clicked(QModelIndex)),
this, SLOT(clickedSlot(QModelIndex)));
QObject::connect(this, SIGNAL(activated(QModelIndex)),
m_pFindWnd, SLOT(hide()));
this->installEventFilter(this);
m_pFindWnd->installEventFilter(this);
}
QFindEdit::~QFindEdit()
{
delete m_pFindWnd;
}
QStringList& QFindEdit::stringList()
{
return m_stringList;
}
void QFindEdit::showFindWnd(const QString& text)
{
QStringList sl;
foreach(QString word, m_stringList) {
if (word.contains(text)) {
sl << word;
}
}
if (sl.size() == 0)
{
hideFineWnd();
return;
}
m_stringListmodel->setStringList(sl);
m_pFindWnd->setModel(m_stringListmodel);
m_pFindWnd->resize(rect().width(), 200);
QPoint pTopleft = mapToGlobal(rect().bottomLeft());
m_pFindWnd->move(pTopleft.x(), pTopleft.y());
m_pFindWnd->show();
}
void QFindEdit::textEditedSlot(const QString& text)
{
QString strText = text.trimmed();
if (!strText.isEmpty())
{
showFindWnd(strText);
}
else
{
hideFineWnd();
}
}
void QFindEdit::clickedSlot(QModelIndex modelIndex)
{
setText(m_pFindWnd->model()->data(modelIndex).toString());
hideFineWnd();
}
void QFindEdit::hideFineWnd()
{
m_pFindWnd->hide();
}
bool QFindEdit::eventFilter(QObject *o, QEvent *e)
{
if (m_bEditFocus && (o == this) && e->type() == QEvent::FocusOut)
{
if (m_pFindWnd && m_pFindWnd->isVisible())
return true;
}
if (o != m_pFindWnd)
return __super::eventFilter(o, e);
switch (e->type())
{
case QEvent::KeyPress:
{
QKeyEvent *ke = static_cast<QKeyEvent *>(e);
QModelIndex curIndex = m_pFindWnd->currentIndex();
QModelIndexList selList = m_pFindWnd->selectionModel()->selectedIndexes();
const int key = ke->key();
if ((key == Qt::Key_Up || key == Qt::Key_Down) && selList.isEmpty() && curIndex.isValid() )
{
m_pFindWnd->setCurrentIndex(curIndex);
return true;
}
switch (key)
{
case Qt::Key_End:
case Qt::Key_Home:
if (ke->modifiers() & Qt::ControlModifier)
return false;
break;
case Qt::Key_Up:
if (!curIndex.isValid())
{
int rowCount = m_pFindWnd->model()->rowCount();
QModelIndex lastIndex = m_pFindWnd->model()->index(rowCount - 1, m_pFindWnd->modelColumn());
m_pFindWnd->setCurrentIndex(lastIndex);
return true;
}
else if (curIndex.row() == 0)
{
return true;
}
return false;
case Qt::Key_Down:
if (!curIndex.isValid())
{
QModelIndex firstIndex = m_pFindWnd->model()->index(0, m_pFindWnd->modelColumn());
m_pFindWnd->setCurrentIndex(firstIndex);
return true;
}
else if (curIndex.row() == m_pFindWnd->model()->rowCount() - 1)
{
return true;
}
return false;
}
m_bEditFocus = false;
this->event(ke);
m_bEditFocus = true;
if ( e->isAccepted() || !m_pFindWnd->isVisible()) {
if (!this->hasFocus())
hideFineWnd();
if (e->isAccepted())
return true;
}
switch (key)
{
case Qt::Key_Return:
case Qt::Key_Enter:
case Qt::Key_Tab:
hideFineWnd();
if (curIndex.isValid())
{
QString text = m_pFindWnd->currentIndex().data().toString();
setText(text);
}
break;
case Qt::Key_F4:
if (ke->modifiers() & Qt::AltModifier)
hideFineWnd();
break;
case Qt::Key_Backtab:
case Qt::Key_Escape:
hideFineWnd();
break;
default:
break;
}
return true;
}
case QEvent::MouseButtonPress:
if (!m_pFindWnd->underMouse())
{
hideFineWnd();
return true;
}
return false;
case QEvent::InputMethod:
case QEvent::ShortcutOverride:
QApplication::sendEvent(this, e);
break;
default:
return false;
}
return false;
}

Maybe try activating the window and/or setting widget focus?

Save Configuration Settings to XML file in QT?

I want to Save Configuration Settings to XML file in QT and read it from there ?
What is best approach to do this in QT ?
Any sample/ideas are highly appreciated.
Thanks.

You can register your XML file format with QSettings::registerFormat
Here's a sample implementation of the readXmlFile and writeXmlFile

There is Qt examples for XML.
Also you can use QSettings to store your settings.

Here is my code for exporting settings to XML. What you need is to call ExportSettingsToXml() with opened for writing QFile. The exported file can be imported again with ImportSettingsFromXml().
QString Variant2Text( const QVariant &value )
{
switch (value.type())
{
case QVariant::String:
case QVariant::Int:
case QVariant::UInt:
case QVariant::LongLong:
case QVariant::ULongLong:
case QVariant::Double:
case QVariant::Bool:
return value.toString();
}
QByteArray ba;
value.save(QDataStream(&ba, QIODevice::WriteOnly));
return QString(ba.toHex());
}
QVariant Text2Variant( const QString &sText, QVariant::Type nType )
{
switch (nType)
{
case QVariant::String:
case QVariant::Int:
case QVariant::UInt:
case QVariant::LongLong:
case QVariant::ULongLong:
case QVariant::Double:
case QVariant::Bool:
{
QVariant var(sText);
if (var.convert(nType))
return var;
return QVariant(sText);
}
return QVariant::fromValue(sText);
}
QVariant value;
value.load(QDataStream(&QByteArray::fromHex(sText.toLatin1()), QIODevice::ReadOnly));
return value;
}
void XmlExportSettingsRecursive(QXmlStreamWriter &writer, QSettings &settings, const QStringList &blackList)
{
QString sGroup = settings.group();
if (!sGroup.isEmpty())
{
writer.writeStartElement("group");
writer.writeAttribute(QStringLiteral("name"), sGroup.mid(sGroup.indexOf(QChar('/')) + 1));
}
// Write child groups first
{
const QStringList &listGroups = settings.childGroups();
foreach (const QString &group, listGroups)
{
settings.beginGroup(group);
XmlExportSettingsRecursive(writer, settings, blackList);
settings.endGroup();
}
}
const QStringList &listKeys = settings.childKeys();
foreach (const QString &key, listKeys)
{
if (blackList.contains(key))
continue;
writer.writeStartElement("key");
writer.writeAttribute(QStringLiteral("name"), key);
const QVariant &value = settings.value(key);
writer.writeAttribute(QStringLiteral("type"), value.typeName());
writer.writeCharacters(Variant2Text(value));
writer.writeEndElement();
}
if (!sGroup.isEmpty())
writer.writeEndElement();
}
bool XmlImportSettingsRecursive(QXmlStreamReader &reader, QSettings &settings)
{
while (!reader.atEnd()) {
reader.readNext();
if (reader.isStartElement())
{
if (reader.name() == QStringLiteral("group"))
{
const QXmlStreamAttributes &attr = reader.attributes();
QString sGroup = attr.value(QStringLiteral("name")).toString();
settings.beginGroup(sGroup);
if (!XmlImportSettingsRecursive(reader, settings))
return false;
settings.endGroup();
}
else if (reader.name() == QStringLiteral("key"))
{
const QXmlStreamAttributes &attr = reader.attributes();
const QString &sKey = attr.value(QStringLiteral("name")).toString();
const QString &sType = attr.value(QStringLiteral("type")).toString();
if (reader.readNext())
{
if (reader.isCharacters() || reader.isEndElement())
{
const QString &sValue = reader.text().toString();
settings.setValue(sKey, Text2Variant(sValue, QVariant::nameToType(sType.toLatin1())));
}
else
continue;
}
}
}
else if (reader.isEndElement() && reader.name() == QStringLiteral("group"))
return true;
}
if (reader.hasError()) {
qDebug()<<reader.errorString();
return false;
}
return true;
}
bool ExportSettingsToXml( QIODevice *device, const QString &settingsGroup = QString(), const QStringList &blackList = QStringList())
{
if (!device || !device->isWritable())
return false;
QSettings settings;
settings.beginGroup(settingsGroup);
QXmlStreamWriter xmlWriter( device );
xmlWriter.setAutoFormatting( true );
xmlWriter.writeStartDocument();
xmlWriter.writeStartElement( QStringLiteral("settings") );
if (!settingsGroup.isEmpty())
{
xmlWriter.writeStartElement(QStringLiteral("group"));
xmlWriter.writeAttribute(QStringLiteral("name"), settingsGroup);
}
XmlExportSettingsRecursive(xmlWriter, settings, blackList);
if (!settingsGroup.isEmpty())
xmlWriter.writeEndElement();
xmlWriter.writeEndDocument();
return true;
}
bool ImportSettingsFromXml( QIODevice *device, const QString &settingsGroup = QString())
{
if (!device || !device->isReadable())
{
qDebug()<<"Trying to import XML settings from non-readable device";
return false;
}
QSettings settings;
settings.beginGroup(settingsGroup);
QXmlStreamReader xmlReader( device );
xmlReader.readNext();
if (!xmlReader.isStartDocument())
{
qDebug()<<"Invalid xml document format";
return false;
}
if (!xmlReader.readNextStartElement())
{
qDebug()<<"Empty settings xml document";
return true;
}
if (xmlReader.name() == QStringLiteral("settings") )
{
if (!XmlImportSettingsRecursive(xmlReader, settings))
return false;
}
else
{
qDebug()<<"Unknown settings format.";
return false;
}
return true;
}

For such things I often use the boost library for C+ and can highly recommend it. It offers serialization for various formats like XML, text, binary etc.
Serialization Tutorial (looks more complicated that it actually is)

Resources