I adjust the QT_MESSAGE_PATTERN on build environment both for pc and raspberry.
When I did a run on pc, debug gives me an output as I adjusted but when a did a run on raspberry pi (deployment) , debug gives me an output like I didn't adjust....
here is adjustment;
QT_MESSAGE_PATTERN = "[(%{file}:%{line}) - %{message}"
in order to work you need to do:
qSetMessagePattern(QT_MESSAGE_PATTERN);
qInstallMessageHandler(yourCustomMessageHandler);
You need to set the message pattern; at the beginning of int main() add qputenv("QT_MESSAGE_PATTERN", QByteArray("[(%{file}:%{line}) - %{message}"));
Try this snippet:
#include <QDebug>
#include <unistd.h>
int main(int /*argc*/, char* /*argv*/ [])
{
qputenv("QT_MESSAGE_PATTERN", QByteArray("[(%{file}:%{line}) - %{message}"));
while (1) {
sleep(1);
qDebug() << "Message";
}
}
Related
I am currently having some trouble debugging a program that starts processes via QProcess.
Simply executing the binary without dbg works just fine but when I try to debug the executable with gdb I am getting a SIGTRAP when the process has started.
After that the stack always shows '??' instead of function names.
When continuing I get a SIGILL.
I found out that the trap is not caused when no breakpoint is set.
In my project I also get following output:
Probes-based dynamic linker interface failed.
I am not sure whether this is related to loaded plugins or libraries.
The problem can be reproduced (except from the " Probes-based dynamic linker interface failed." output) with the following code:
#include <QCoreApplication>
#include <QProcess>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QProcess proc;
QString exe = "echo";
QStringList arguments;
arguments << "Test";
proc.start(exe, arguments);
if (!proc.waitForFinished()) {
qDebug() << "failed to start" << proc.exitCode() << proc.errorString();
}
qDebug() << "process finished";
qDebug() << proc.readAllStandardOutput();
return a.exec();
}
My OS is arch linux (up to date)
Qt5: qt5-base 5.15.1-1
GDB: gdb 9.2-1
clang++: clang 10.0.1-1
Does anybody have an idea what is causing the SIGTRAP when debugging with dbg?
This is my first time using QMap and I don't know what I'm doing wrong.
#include <QMap>
QMap<QString, int> name_sec_age;
name_sec_age.insert("willy", 593381460);
my errors are:
"unknown type name 'name_sec_age'"
and "expected unqualified id"
I'm using Qt Creator 4.0 with Qt 5.6 on a mac.
Side note: the run button on Qt Creator isn't available. To run my app I build it and then open the app from its path in finder. rather annoying.
You can't run code in the wild like that, it needs to be in a function.
#include <QMap>
#include <QString>
#include <QDebug>
int main() {
QMap<QString, int> name_sec_age;
name_sec_age.insert("willy", 593381460);
qDebug() << name_sec_age;
}
Your setup must be messed up somehow. Perhaps you'll have more luck by installing macports and using Qt/Qt Creator from there.
The following compiles just fine for me under Qt 5.5.1:
#include <QMap>
int main() {
QMap<QString, int> name_sec_age;
name_sec_age.insert("willy", 593381460);
}
I am trying to run the Qt 5.7 beta QBluetooth GATT Server example ( https://doc-snapshots.qt.io/qt5-dev/qtbluetooth-heartrate-server-example.html ) on a Raspberry Pi 3 with it's integrated Broadcom Bluetooth chip.
Bluetooth works great on my Pi 3 and the hci0 interface is "UP RUNNING" after a fresh boot:
root#raspberrypi:~/bluez-5.39# hciconfig -a
hci0: Type: BR/EDR Bus: UART
BD Address: B8:27:EB:6F:71:A7 ACL MTU: 1021:8 SCO MTU: 64:1
UP RUNNING PSCAN
RX bytes:2316 acl:0 sco:0 events:99 errors:0
TX bytes:2676 acl:0 sco:0 commands:99 errors:0
Features: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH SNIFF
Link mode: SLAVE ACCEPT
Name: 'raspberrypi'
Class: 0x000000
Service Classes: Unspecified
Device Class: Miscellaneous,
HCI Version: 4.1 (0x7) Revision: 0xb6
LMP Version: 4.1 (0x7) Subversion: 0x2209
Manufacturer: Broadcom Corporation (15)
I successfully downloaded, compiled, and installed the latest BlueZ 5.39, which contains a complete DBus interface to the BlueZ BLE functionality:
http://www.kernel.org/pub/linux/bluetooth/bluez-5.39.tar.xz
I've confirmed that the versions picked up in the path are the right version:
[bluetooth]# version
Version 5.39
I used buildroot to cross compile Qt 5.7 and deployed it's libraries to the Pi. I can successfully build on my host machine and run the resulting executable on the Pi.
The GATT example from Qt is very simple and I only added 2 "qDebug" lines to see some console ouput. I'll paste it here for completeness:
#include <QtBluetooth/qlowenergyadvertisingdata.h>
#include <QtBluetooth/qlowenergyadvertisingparameters.h>
#include <QtBluetooth/qlowenergycharacteristic.h>
#include <QtBluetooth/qlowenergycharacteristicdata.h>
#include <QtBluetooth/qlowenergydescriptordata.h>
#include <QtBluetooth/qlowenergycontroller.h>
#include <QtBluetooth/qlowenergyservice.h>
#include <QtBluetooth/qlowenergyservicedata.h>
#include <QtCore/qbytearray.h>
#include <QtCore/qcoreapplication.h>
#include <QtCore/qlist.h>
#include <QtCore/qscopedpointer.h>
#include <QtCore/qtimer.h>
#include <QDebug>
int main(int argc, char *argv[])
{
QCoreApplication app(argc, argv);
QLowEnergyAdvertisingData advertisingData;
advertisingData.setDiscoverability(QLowEnergyAdvertisingData::DiscoverabilityGeneral);
advertisingData.setIncludePowerLevel(true);
advertisingData.setLocalName("BlueZ 5 GATT Server");
advertisingData.setServices(QList<QBluetoothUuid>() << QBluetoothUuid::HeartRate);
QLowEnergyCharacteristicData charData;
charData.setUuid(QBluetoothUuid::HeartRateMeasurement);
charData.setValue(QByteArray(2, 0));
charData.setProperties(QLowEnergyCharacteristic::Notify);
const QLowEnergyDescriptorData clientConfig(QBluetoothUuid::ClientCharacteristicConfiguration,
QByteArray(2, 0));
charData.addDescriptor(clientConfig);
QLowEnergyServiceData serviceData;
serviceData.setType(QLowEnergyServiceData::ServiceTypePrimary);
serviceData.setUuid(QBluetoothUuid::HeartRate);
serviceData.addCharacteristic(charData);
const QScopedPointer<QLowEnergyController> leController(QLowEnergyController::createPeripheral());
const QScopedPointer<QLowEnergyService> service(leController->addService(serviceData));
qDebug() << "Beginning to advertise...";
leController->startAdvertising(QLowEnergyAdvertisingParameters(), advertisingData,
advertisingData);
QTimer heartbeatTimer;
quint8 currentHeartRate = 60;
enum ValueChange { ValueUp, ValueDown } valueChange = ValueUp;
const auto heartbeatProvider = [&service, ¤tHeartRate, &valueChange]() {
QByteArray value;
value.append(char(0)); // Flags that specify the format of the value.
value.append(char(currentHeartRate)); // Actual value.
QLowEnergyCharacteristic characteristic
= service->characteristic(QBluetoothUuid::HeartRateMeasurement);
Q_ASSERT(characteristic.isValid());
qDebug() << "Changing characteristic to: " << value;
service->writeCharacteristic(characteristic, value); // Potentially causes notification.
if (currentHeartRate == 60)
valueChange = ValueUp;
else if (currentHeartRate == 100)
valueChange = ValueDown;
if (valueChange == ValueUp)
++currentHeartRate;
else
--currentHeartRate;
};
QObject::connect(&heartbeatTimer, &QTimer::timeout, heartbeatProvider);
heartbeatTimer.start(1000);
auto reconnect = [&leController, advertisingData]() {
leController->startAdvertising(QLowEnergyAdvertisingParameters(), advertisingData,
advertisingData);
};
QObject::connect(leController.data(), &QLowEnergyController::disconnected, reconnect);
return app.exec();
}
Pro file:
TEMPLATE = app
TARGET = qt-gatt
QT += bluetooth
CONFIG += c++11
SOURCES += main.cpp
## Install directory
target.path = /home/pi
INSTALLS += target
When I run the app on the Pi as root after a fresh boot - it runs and outputs my print messages:
root#raspberrypi:/home/pi# ./qt-gatt
Beginning to advertise...
Changing characteristic to: "\x00<"
Changing characteristic to: "\x00="
Changing characteristic to: "\x00>"
Changing characteristic to: "\x00?"
There are no errors or warnings displayed - but none of my devices can see it. My iPhone and Mac can see other BLE devices, but not the Pi. The code sets the Pi as "discoverable".
How can I make this work / What am I doing wrong?
You may already know this but I think bluetoothd still needs to be started with -E for experimental mode.
Also you can add the following line at the top of main() to see logging from QBluetooth. Let us know what you see or figure out. I'm trying to do a very similar thing and having now luck...and the logging doesn't seem to work on my platform.
QLoggingCategory::setFilterRules(QStringLiteral("qt.bluetooth* = true"));
According to qlogging.h
#define qDebug QMessageLogger(__FILE__, __LINE__, Q_FUNC_INFO).debug
but when I use like this, file,line,function name not show.
qDebug()<< "abc"; // only show abc;
qDebug()<< ""; // show nothing;
I search for a while, it seems no one had my problem like above.
I use ubuntu14.04,g++ version 4.8.2, qt5.3 build from git.
You can reformat from default output format.
This function was introduced in Qt 5.0.
The line number does not output because the default message pattern is "%{if-category}%{category}: %{endif}%{message}". This format means that the default outputting format is not including metadata like a line number or file name.
% cat logtest.pro
TEMPLATE = app
TARGET = logtest
mac:CONFIG-=app_bundle
SOURCES += main.cpp
% cat main.cpp
#include <QCoreApplication>
#include <QDebug>
int main(int argc, char *argv[])
{
qSetMessagePattern("%{file}(%{line}): %{message}");
QCoreApplication a(argc, argv);
qDebug() << "my output";
return 0;
}
% qmake && make
% ./logtest
main.cpp(8): my output
You can also use QT_MESSAGE_PATTERN environment variable for setting the message pattern without calling qSetMessagePattern().
See reference for other placeholder. http://qt-project.org/doc/qt-5/qtglobal.html#qSetMessagePattern
If you dig in Qt history you can find out that the __FILE__ and __FUNCTION__ are logged only in debug builds since 1 Oct 2014. The git commit hash is d78fb442d750b33afe2e41f31588ec94cf4023ad. The commit message states:
Logging: Disable tracking of debug source info for release builds
Tracking the file, line, function means the information has to be
stored in the binaries, enlarging the size. It also might be a
surprise to some commercial customers that their internal file &
function names are 'leaked'. Therefore we enable it for debug builds
only.
Here's a simple example of how you might use the captured QMessageLogContext data in a custom message handler installed using qInstallMessageHandler. I didn't output the category or version members because they didn't seem useful. If desired you could also log to a file this way.
#include <QDebug>
#include <QString>
#include <QDateTime>
#include <iostream>
void verboseMessageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
static const char* typeStr[] = {"[ Debug]", "[ Warning]", "[Critical]", "[ Fatal]" };
if(type <= QtFatalMsg)
{
QByteArray localMsg = msg.toLocal8Bit();
QString contextString(QStringLiteral("(%1, %2, %3)")
.arg(context.file)
.arg(context.function)
.arg(context.line));
QString timeStr(QDateTime::currentDateTime().toString("dd-MM-yy HH:mm:ss:zzz"));
std::cerr << timeStr.toLocal8Bit().constData() << " - "
<< typeStr[type] << " "
<< contextString.toLocal8Bit().constData() << " "
<< localMsg.constData() << std::endl;
if(type == QtFatalMsg)
{
abort();
}
}
}
int main()
{
//Use default handler
qDebug() << "default handler";
qWarning() << "default handler";
qCritical() << "default handler";
//Install verbose handler
qInstallMessageHandler(verboseMessageHandler);
qDebug() << "verbose handler";
qWarning() << "verbose handler";
qCritical() << "verbose handler";
//Restore default handler
qInstallMessageHandler(0);
qDebug() << "default handler";
qWarning() << "default handler";
qCritical() << "default handler";
return 0;
}
You can use standard C++'s __LINE__ and __FILE__. Also, take a look at What's the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__ SO question. If you use GCC, you can write __PRETTY_FUNCTION__ to get information about function from where the code executes. Just prepare debug-define you like.
For example, here is small compilable application:
#include <QApplication>
#include <QDebug>
#include <iostream>
// Qt-way
#define MyDBG (qDebug()<<__FILE__<<__LINE__<<__PRETTY_FUNCTION__)
// GCC
#define MyStdDBG (std::cout<< __FILE__<<":"<<__LINE__<<" in "<<__PRETTY_FUNCTION__<<std::endl)
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
// Qt-way
MyDBG;
MyDBG << "Something happened!";
// GCC
MyStdDBG;
return a.exec();
}
It gives next output:
../path/main.cpp 14 int main(int, char**)
../path/main.cpp 15 int main(int, char**) Something happened!
../path/main.cpp:18 in int main(int, char**)
UPD: Added pure C++-way to output.
I think you need to define:
#define qDebug() QMessageLogger(__FILE__, __LINE__, Q_FUNC_INFO).debug()
and use it as
qDebug() << "abc";
or
#define qDebug QMessageLogger(__FILE__, __LINE__, Q_FUNC_INFO).debug()
and use it as:
qDebug << "abc";
According to documentation qDebug() is already a macro to QMessageLogger(). Default Message handler prints only the message to stderr. I think you might want to use qInstallMessageHandler() to install your own message handler, that uses the context
Edit:
There is a relevant section in a manual, that describes this issue. In Qt4 context variable was not passed to installed message handler, so this solution is Qt5+ only. Default message handler does not make use of passed in context, but you can easily install your own, it's just a function pointer. There is even an example in the manual.
This depends on your Qt version number, whether you are using a debug build or a release build of Qt, and whether you have customized Qt message handling in your application.
According to Qt 5.4 documentation written in source code "qlogging.cpp":
QMessageLogger is used to generate messages for the Qt logging framework. Usually one uses
it through qDebug(), qWarning(), qCritical, or qFatal() functions,
which are actually macros: For example qDebug() expands to
QMessageLogger(__FILE__, __LINE__, Q_FUNC_INFO).debug()
for debug builds, and QMessageLogger(0, 0, 0).debug() for release builds.
So if you do not see file, line and function name information in your output, very likely you are using a release version of Qt.
If you still want to see the file, line and function name information in your output with a release version of Qt, there are several ways of achieving it, as very well explained in some of the previous answers.
If you wonder how to get the debug context in a non-debug build: Define QT_MESSAGELOGCONTEXT while compiling your code, and the information won't be stripped:
http://doc.qt.io/qt-5/qmessagelogcontext.html
I am trying to figure out the use of QProcess. I looked at Qt doc with no luck.
http://doc.qt.io/qt-4.8/qprocess.html
EXAMPLES OF PROBLEM.
Example 1: Code bellow works.
#include <QtCore/QCoreApplication>
#include <QTextStream>
#include <QByteArray>
#include <QProcess>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QTextStream qout(stdout);
QProcess cmd;
cmd.start("cmd");
if (!cmd.waitForStarted()) {
return false;
}
cmd.waitForReadyRead();
QByteArray result = cmd.readAll();
//qout << result.data() << endl; //console junk captured, doesn't show.
//My test command
cmd.write("echo hello");
cmd.write("\n");
//Capture my result
cmd.waitForReadyRead();
//This is my command shown by cmd, I don't show it, capture & discard it.
result = cmd.readLine();
//Read result of my command ("hello") and the rest of output like cur dir.
result = cmd.readAll();
qout << result.data();
qout << "\n\n---End, bye----" << endl;
return a.exec();
}
The output of the above code is
hello
F:\Dev_Qt\expControllingExtConsoleApps-build-desktop>
---End, bye----
The problem is that if I try to use ipconfig or 7zip in this fashion via Qprocess and cmd console, I am unable to see any output from ipconfig or 7zip. I don't know if anything is even done, if something is done then why can't I see the output? Code below illustrates.
Example 2: Does not work. Can't use ipconfig.
#include <QtCore/QCoreApplication>
#include <QTextStream>
#include <QByteArray>
#include <QString>
#include <QProcess>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QTextStream qout(stdout);
QProcess cmd2;
cmd2.setWorkingDirectory("C:/Program Files/7-Zip"); //not needed in this example.
cmd2.setReadChannel(QProcess::StandardOutput);
cmd2.setProcessChannelMode(QProcess::MergedChannels);
cmd2.start("cmd");
if (!cmd2.waitForStarted())
{
qout << "Error: Could not start!" << endl;
return false;
}
cmd2.waitForReadyRead();
QByteArray result = cmd2.readAll();
qout << result.data() << endl; //Console version info, etc.
//My command
cmd2.write("ipconfig");
cmd2.write("\n");
//Capture output of ipconfig command
//DOES NOT WORK!!
cmd2.waitForReadyRead();
while (! cmd2.atEnd())
{
result = cmd2.readLine();
qout << result;
result.clear();
}
qout << endl;
qout << "\n\n---end----" << endl;
return a.exec();
}
Output is below, it is missing the ipconfig connection information result. No output from ipconfig is captured at all.
Microsoft Windows XP [Version
5.1.2600] (C) Copyright 1985-2001 Microsoft Corp.
C:\Program Files\7-Zip> ipconfig
---end----
Should have been more like this (with ipconfig result).
Microsoft Windows XP [Version
5.1.2600] (C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and
Settings\noname>ipconfig
Windows IP Configuration
Ethernet adapter Local Area
Connection:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.172.148.135
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.172.148.177
C:\Documents and Settings\noname>
Obviously the output should should have been a little diff than above but the Connection info which is the output of "ipconfig" should have been captured. In the same way if I try to use 7zip via cmd console... I can not see/capture any output of 7zip. So my question is how can I use command line apps like ipconfig and 7zip via QProcess and cmd console and see the result of the output of these applications?
Example 3: 7zip does not work
#include <QtCore/QCoreApplication>
#include <QTextStream>
#include <QByteArray>
#include <QProcess>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QTextStream qout(stdout);
QProcess cmd2;
cmd2.setWorkingDirectory("C:/Program Files/7-Zip");
cmd2.setReadChannel(QProcess::StandardOutput);
cmd2.setProcessChannelMode(QProcess::MergedChannels);
cmd2.start("cmd");
if (!cmd2.waitForStarted()) {
return false;
}
//My Command
cmd2.write("7z.exe");
cmd2.write("\n");
//Capture output of ipconfig command
cmd2.waitForReadyRead();
QByteArray result;
while (! cmd2.atEnd()) {
result = cmd2.readLine();
qout << result;
result.clear();
}
qout << endl;
qout << "\n\n---end----" << endl;
return a.exec();
}
Output below. Does not show anything from 7zip.
Microsoft Windows XP [Version
5.1.2600] (C) Copyright 1985-2001 Microsoft Corp.
C:\Program Files\7-Zip>7z.exe
---end----
Output is expected to be along the lines of...
Microsoft Windows XP [Version
5.1.2600] (C) Copyright 1985-2001 Microsoft Corp.
C:\Documents and Settings\noname>cd
C:\Program Files\7-Zip
C:\Program Files\7-Zip>7z.exe
7-Zip 9.15 beta Copyright (c)
1999-2010 Igor Pavlov 2010-06-20
Usage: 7z [...]
<archive_name> [<file_names>...]
[<#listfiles...>]
a: Add files to archive
b: Benchmark d: Delete files from
archive e: Extract files from
archive (without using directory
names) l: List contents of archive
t: Test integrity of archive u:
Update files to archive x: eXtract
files with full paths
-ai[r[-|0]]{#listfile|!wildcard}: Include archives
-ax[r[-|0]]{#listfile|!wildcard}: eXclude archives -bd: Disable
percentage indicator
-i[r[-|0]]{#listfile|!wildcard}: Include filenames -m{Parameters}:
set compression Method
-o{Directory}: set Output directory -p{Password}: set Password -r[-|0]: Recurse subdirectories -scs{UTF-8 |
WIN | DOS}: set charset for list files
-sfx[{name}]: Create SFX archive -si[{name}]: read data from stdin -slt: show technical information for l (List) command -so: write data to
stdout -ssc[-]: set sensitive case
mode -ssw: compress shared files
-t{Type}: Set type of archive -u[-][p#][q#][r#][x#][y#][z#][!newArchiveName]:
Update options -v{Size}[b|k|m|g]:
Create volumes -w[{path}]: assign
Work directory. Empty path means a
temporary directory
-x[r[-|0]]]{#listfile|!wildcard}: eXclude filenames -y: assume Yes on
all queries
C:\Program Files\7-Zip>
eI see one big problem.
Under windows you issue a commend pressing the Enter key. Writing
cmd.write("command");
cmd.write("\n");
just isn't enough you have to write
cmd.write("command");
cmd.write("\n\r");
Notice the trailing \r. Try this, it should work better, and by better I mean 7zip. I don't know if you'll get ipconfig to work properly.
Good luck and best regards
D
EDIT
Here is a working solution:
#include <QtCore/QCoreApplication>
#include <QtCore/QProcess>
#include <QtCore/QString>
#include <QtCore/QTextStream>
// Not clean, but fast
QProcess *g_process = NULL;
// Needed as a signal catcher
class ProcOut : public QObject
{
Q_OBJECT
public:
ProcOut (QObject *parent = NULL);
virtual ~ProcOut() {};
public slots:
void readyRead();
void finished();
};
ProcOut::ProcOut (QObject *parent /* = NULL */):
QObject(parent)
{}
void
ProcOut::readyRead()
{
if (!g_process)
return;
QTextStream out(stdout);
out << g_process->readAllStandardOutput() << endl;
}
void
ProcOut::finished()
{
QCoreApplication::exit (0);
}
int main (int argc, char **argv)
{
QCoreApplication *app = new QCoreApplication (argc, argv);
ProcOut *procOut = new ProcOut();
g_process = new QProcess();
QObject::connect (g_process, SIGNAL(readyReadStandardOutput()),
procOut, SLOT(readyRead()));
QObject::connect (g_process, SIGNAL(finished (int, QProcess::ExitStatus)),
procOut, SLOT(finished()));
g_process->start (QLatin1String ("cmd"));
g_process->waitForStarted();
g_process->write ("ipconfig\n\r");
// Or cmd won't quit
g_process->write ("exit\n\r");
int result = app->exec();
// Allright, process finished.
delete procOut;
procOut = NULL;
delete g_process;
g_process = NULL;
delete app;
app = NULL;
// Lets us see the results
system ("pause");
return result;
}
#include "main.moc"
Hope that helps. It worked everytime on my machine.
Even though Dariusz Scharsig already provided a solution to the problem, I would like to point out what I believe to be the actual problem(s) which can be solved using the signal slot mechanism.
Problem 1. The condition in your while loop is based on bool QProcess::atEnd () const which is according to QProcess Documentation states:
Reimplemented from QIODevice::atEnd().
Returns true if the process is
not running, and no more data is available for reading; otherwise
returns false.
But if you looking the documentation for QIODevice::atEnd(), it states:
Returns true if the current read and write position is at the end of
the device (i.e. there is no more data available for reading on the
device); otherwise returns false.
For some devices, atEnd() can return
true even though there is more data to read. This special case only
applies to devices that generate data in direct response to you
calling read() (e.g., /dev or /proc files on Unix and Mac OS X, or
console input / stdin on all platforms).
Solution 1. Change the while loop condition to check the state of your process: while(cmd2.state()!=QProcess::NotRunning){.
Problem 2. You use cmd2.waitForReadyRead(); outside of the loop. Perhaps some data is ready for reading now and when you finished reading, some more gets made available:
you read the commands you just wrote : ipconfig\n
ipconfig takes some time to start up and send text to the console. But by then you have already exited your loop because atEnd() gave true even though your process is still running.
Solution 2. place the waitForReadyRead() inside your loop.
Consequence 2. waitForReadyRead() will tell you when there is data available, which could be more than one Line, so you should consequently also change the cmd2.ReadLine() to cmd2.ReadAll().
Problem 3. As documented in QProcess::closeWriteChannel()
Closing the write channel is necessary for programs that read input
data until the channel has been closed.
Solution 3. One of the following options should work when finished writing your inputs
End the process: cmd2.write("exit\n");
close the Writechannel: cmd2.closeWriteChannel();
Working code:
#include <QtCore/QCoreApplication>
#include <QTextStream>
#include <QByteArray>
#include <QString>
#include <QProcess>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QTextStream qout(stdout);
QByteArray result;
QProcess cmd2;
cmd2.setReadChannel(QProcess::StandardOutput);
cmd2.setProcessChannelMode(QProcess::MergedChannels);
cmd2.start("cmd");
if (!cmd2.waitForStarted()){
qout << "Error: Could not start!" << endl;
return 0;
}
cmd2.write("ipconfig\n");
cmd2.closeWriteChannel(); //done Writing
while(cmd2.state()!=QProcess::NotRunning){
cmd2.waitForReadyRead();
result = cmd2.readAll();
qout << result;
}
qout << endl << "---end----" << endl;
return a.exec();
}
I wrote this answer just to explain the way I understand your problem and found a solution but would like to emphasize that the Preferable Solution is to use the Signal/Slot Mechanism as presented by Dariusz.