I want to use managed code in my VC++ Project ,
Here is my Code
ref class MySQSClass
{
public:
System::String ^QueryURL ;
MySQSClass();
~MySQSClass();
};
MySQSClass :: MySQSClass()
{
QueueURL = "https://sqs.us-east-1.amazonaws.com/036469908951/TestDBQueue";
}
But it giving me error like
error C2065: 'QueueURL' : undeclared identifier
Related
I am in an initial stage for developing a BLE library using DLL(Universal Windows) using VS2019.
Below showing the code snippet.
void Device::StartDeviceScan()
{
// Additional properties we would like about the device.
auto requestedProperties = single_threaded_vector<hstring>(
{ L"System.Devices.Aep.DeviceAddress",
L"System.Devices.Aep.IsConnected",
L"System.Devices.Aep.Bluetooth.Le.IsConnectable" });
// list Bluetooth LE devices
hstring aqsAllBluetoothLEDevices =
L"(System.Devices.Aep.ProtocolId:=\"{bb7bb05e-5972-42b5-94fc-76eaa7084d49}\")";
m_DeviceWatcher = Windows::Devices::Enumeration::DeviceInformation::CreateWatcher(
aqsAllBluetoothLEDevices,
requestedProperties,
DeviceInformationKind::AssociationEndpoint);
// Register event handlers before starting the watcher.
m_DeviceWatcherAddedRevoker = m_DeviceWatcher.Added(
winrt::auto_revoke,
&Device::DeviceWatcher_Added);
While building the project i am getting following issues,
1>E:\Piu_projects_test\SensorDll\SensorDll\Generated Files\winrt\base.h(5170): error C2516: 'H': is not a legal base class
1>E:\Piu_projects_test\SensorDll\SensorDll\Generated Files\winrt\Windows.Foundation.h(888): message : see reference to class template instantiation 'winrt::impl::implements_delegate<winrt::Windows::Foundation::TypedEventHandler<winrt::Windows::Devices::Enumeration::DeviceWatcher,winrt::Windows::Devices::Enumeration::DeviceInformation>,H>' being compiled
1> with
1> [
1> H=void (__cdecl infinitysensormodule::Device::* )(winrt::Windows::Devices::Enumeration::DeviceWatcher,winrt::Windows::Devices::Enumeration::DeviceInformation)
1> ]
1>E:\Piu_projects_test\SensorDll\SensorDll\Generated Files\winrt\base.h(5219): message : see reference to class template instantiation 'winrt::impl::delegate<T,H>' being compiled
1> with
1> [
1>
Could you please suggest a solution?
In order to test some functions of a Qt application (named qtapp), I build the Qt application as lib/dll library. The ctor and dtor have been correctly exported in the library. However compiling the test project (a Qt console project named consoleTest) is always running to the following link errors:
Link:
1> Bibliothek "C:\Users\gmbh\test\x64\Debug\consoleTest.lib" und Objekt C:\Users\gmbh\test\x64\Debug\consoleTest.exp" werden erstellt.
1>moc_testFour.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""public: static struct QMetaObject const qtapp::staticMetaObject" (?staticMetaObject#qtapp##2UQMetaObject##B)".
1>testFour.obj : error LNK2001: Nicht aufgelöstes externes Symbol ""public: static struct QMetaObject const qtapp::staticMetaObject" (?staticMetaObject#qtapp##2UQMetaObject##B)".
1>C:\Users\gmbh\test\x64\Debug\consoleTest.exe : fatal error LNK1120: 1 nicht aufgelöste Externe
The Qt application is quite simple:
#ifndef QTAPP_H
#define QTAPP_H
#include <QtWidgets/QMainWindow>
#include "ui_qtapp.h"
class __declspec(dllexport) qtapp : public QMainWindow
{
Q_OBJECT
public:
qtapp(QWidget* parent = 0);
~qtapp();
private:
Ui::qtappClass ui;
};
#endif // QTAPP_H
Implementation:
#include "qtapp.h"
__declspec(dllexport) qtapp::qtapp(QWidget* parent)
: QMainWindow(parent)
{
ui.setupUi(this);
}
__declspec(dllexport) qtapp::~qtapp()
{
}
If I simply include #include "qtapp.h" in the test project, the compiler yields the above error.
My questions:
What are the causes for the errors?
How to correctly deploy a Qt
application as lib?
My compiler is visual studio 2013, qt has the version of 5.4.2
That's actually a question independent of Qt. When linking an application against the library you need to have __declspec(dllimport) instead of __declspec(dllexport).
To achieve that, one usually uses defines that change when linking the library vs linking the application against the library. Microsoft has a help page on that "Importing into an Application Using __declspec(dllimport)".
The Qt documentation provides another one. The one thing where Qt can help, is replacing the __declspec by a cross-platform Q_DECL_IMPORT.
I am trying to connect to SQL Server 2008R2 with my qt application in windows but I am getting errors. Here's what I am doing:
#include "ui_test1.h";
#include "QtSql/QtSql";
void Test1::on_btnsnd_clicked()
{
QSqlDatabase db = QSqlDatabase::addDatabase("ODBC");
db.setHostName("ITPL_PC1");
db.setDatabaseName("Test");
db.setUserName("sa");
db.setPassword("insforia");
db.open();
QSqlQueryModel *model = new QSqlQueryModel;
QString query = "insert into qttable(PID) values('ARUP')";
model->setQuery(query, db);
db.close();
}
i am getting this error 27 times :
test1.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QSqlDatabase::~QSqlDatabase(void)" (__imp_??1QSqlDatabase##QAE#XZ) referenced in function "private: void __thiscall Test1::on_btnsnd_clicked(void)" (?on_btnsnd_clicked#Test1##AAEXXZ)
I don't know how to do this (I found this in google.)
What should I do to fix it?
If you use MSVC, you should add %QTDIR%/lib/QtSql4.lib to Release configuration of your project and %QTDIR%/lib/QtSqld4.lib to Debug one. You should change 4 in file names to 500, if you use Qt 5.0. So, file names would be %QTDIR%/lib/QtSql500.lib and %QTDIR%/lib/QtSqld500.lib
If you use QtCreator you should add the next line into your .pro file
QT += sql
Upd: added description for QtCreator's .pro file
I have a very strange error in my Qt project. Here is the code, the main_window.h:
#include <QtGui>
#include <QtSql>
class main_window : public QTabWidget
{
Q_OBJECT
/// #name List Widgets
private:
QListWidget* m_documents_list;
....
and here is main_window.cpp:
...
void main_window::create_documents_widget()
{
m_documents = new QWidget(this);
m_documents_list = new QListWidget(m_documents);
}
...
The problem that I can't understand is in QListView, I'm not using it in my project. There is only QListWidget, but when I'm trying to build the project the following errors occur:
qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
qlistview.h:194: error: expected ',' or '...' before '&' token
Also the following strange errors:
qlistwidget.h:308: error: no 'void QListWidget::removeItemWidget(QListWidgetItem)' member function declared in class 'QListWidget'*
qlistwidget.h:311: error: no 'void QListWidget::addItem(QListWidgetItem)' member function declared in class 'QListWidget'*
qlistwidget.h:314: error: no 'QListWidgetItem QListWidget::itemAt(int, int) const' member function declared in class 'QListWidget'*
etc.
Thanks in advance.
UPD: I'm using QtCreator 2.2.1 on Windows 7.
UPD2: Qt version is 4.7.1.
UPD3: The complete output
In file included from c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/QtGui:68,
from ..\my_project\/main_window.h:4,
from ..\my_project\main.cpp:2:
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: expected ',' or '...' before '&' token
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: ISO C++ forbids declaration of 'QListView' with no type
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:194: error: expected ';' before '&' token
In file included from c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/QtGui:69,
from ..\my_project\/main_window.h:4,
from ..\my_project\main.cpp:2:
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:202: error: redefinition of 'class QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistview.h:58: error: previous definition of 'class QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:308: error: no 'void QListWidget::removeItemWidget(QListWidgetItem*)' member function declared in class 'QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:311: error: no 'void QListWidget::addItem(QListWidgetItem*)' member function declared in class 'QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:314: error: no 'QListWidgetItem* QListWidget::itemAt(int, int) const' member function declared in class 'QListWidget'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'void QListWidgetItem::setSelected(bool)':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:318: error: 'class QListWidget' has no member named 'setItemSelected'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'bool QListWidgetItem::isSelected() const':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:321: error: 'class QListWidget' has no member named 'isItemSelected'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'void QListWidgetItem::setHidden(bool)':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:324: error: 'class QListWidget' has no member named 'setItemHidden'
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h: In member function 'bool QListWidgetItem::isHidden() const':
c:\QtSDK\Desktop\Qt\4.7.3\mingw\include\QtGui/qlistwidget.h:327: error: 'class QListWidget' has no member named 'isItemHidden'
Firstly - you should also mention qt version, as in this case that's most important.
This seems like some weird quirk of compiler or qt - my recomendation would be first to create simplest program where problem occurs. If it shows also in program like
#include <QtGui/QListWidget>
int main(int argc, char* argv[]){
QListWidget* w = 0;
}
then it is some problem with qt headers of compiler - then answer cannot be provided from data provided. If it works, then try to slowly add other elements of your code to this simple file - most likely at some point you will get the same error again - then you will know that last added piece of code is guilty. Some additional thinking might be required to figure out how to remove problem once located.
It should be noted that QListWidget inherits from QListView, so you are indirectly using it.
The error your getting looks like you're simply missing a #include <QListWidget> line in your header file.
Also, it could be that that you're missing #include guards in your header file
#ifndef MYCLASS
#define MYCLASS
class MyClass { ... };
#endif
If your header file is #included by more than one project then that would explain the errors you're seeing.
Greetings all,
I am trying to implement a QT Plugin with CMake. But this "Q_EXPORT_PLUGIN2" directive stops my class from compiling. I can compile the plugin if I commented this out,but it won't work as a plugin if I do so.
QT doc says:
Q_EXPORT_PLUGIN2 ( PluginName, ClassName )
The value of PluginName should
correspond to the TARGET specified in
the plugin's project file
What about in CMake case? What should be the value for 'PluginName'?
Here is my Plugin Interface :
#ifndef RZPLUGIN3DVIEWERFACTORY_H_
#define RZPLUGIN3DVIEWERFACTORY_H_
#include <QObject>
#include "plugin/IRzPluginFactory.h"
class RzPlugin3DViewerFactory :public QObject,public IRzPluginFactory{
Q_OBJECT
Q_INTERFACES(IRzPluginFactory)
private:
QString uid;
public:
RzPlugin3DViewerFactory();
virtual ~RzPlugin3DViewerFactory();
IRzPlugin* createPluginInstance();
IRzPluginContext* createPluginContextInstance();
QString & getPluginUID();
};
#endif /* RZPLUGIN3DVIEWERFACTORY_H_ */
And implementation
#include "RzPlugin3DViewerFactory.h"
#include "RzPlugin3DViewer.h"
RzPlugin3DViewerFactory::RzPlugin3DViewerFactory() {
uid.append("RzPlugin3DView");
}
RzPlugin3DViewerFactory::~RzPlugin3DViewerFactory() {
// TODO Auto-generated destructor stub
}
IRzPlugin* RzPlugin3DViewerFactory::createPluginInstance(){
RzPlugin3DViewer *p=new RzPlugin3DViewer;
return p;
}
IRzPluginContext* RzPlugin3DViewerFactory::createPluginContextInstance()
{
return NULL;
}
QString & RzPlugin3DViewerFactory::getPluginUID()
{
return uid;
}
Q_EXPORT_PLUGIN2(pnp_extrafilters, RzPlugin3DViewerFactory)
Error Message is :
[ 12%] Building CXX object
CMakeFiles/RzDL3DView.dir/RzPlugin3DViewerFactory.cpp
.obj
C:\svn\osaka3d\trunk\osaka3d\rinzo-platform\src\dlplugins\threedviewer\RzPlugin3
DViewerFactory.cpp:36: error: expected
constructor, destructor, or type
conversi on before '(' token make[2]:
*** [CMakeFiles/RzDL3DView.dir/RzPlugin3DViewerFactory.cpp.obj]
Error 1
make[1]: *
[CMakeFiles/RzDL3DView.dir/all] Error
2 make: * [all] Error 2
Ok , I fixed the problem by giving the project name specified in Cmake file.
PROJECT (RinzoDLPlugin3DViewer CXX C)
So,now in CPP file its
Q_EXPORT_PLUGIN2(RinzoDLPlugin3DViewer , RzPlugin3DViewerFactory)
and included qpluginh.h
#include <qplugin.h>
I think the macro should be Q_EXPORT_PLUGIN2(pnp_rzplugin3dviewerfactory, RzPlugin3DViewerFactory) or whatever you have listed as the target name in the .pro file. In fact, the "pnp" part stands for "Plug & Paint" which is the Qt demo program for writing plugins :)
Edit:
Since I misunderstood how CMake works, this information isn't really relevant to the OP. I did do a quick search however and turned up this discussion of Qt, plugins and CMake. I hope there is some useful info there.
http://lists.trolltech.com/qt-interest/2007-05/msg00506.html