I am trying to grab the names of webcams plugged into my computer and shove them into a combobox, then access the name later. Here is my code:
#include <QApplication>
#include <QComboBox>
#include <QCameraInfo>
#include <iostream>
int main(int argc, char *argv[])
{
QApplication app{ argc, argv };
QComboBox combo;
QList<QCameraInfo> info = QCameraInfo::availableCameras();
foreach(QCameraInfo i, info)
combo.addItem(i.description());
combo.show();
std::cout << combo.currentText().toStdString() << std::endl;
return app.exec();
}
The code creates and shows a combo box that has the name of a webcam that I have plugged in to the computer. It will then toss me an access violation exception in trying to print the combo box string to the console.
If I comment the cout line out, all is well, but on exit I get a Debug Assertion Failed! message:
Expression: _BLOCK_TYPE_IS_VALID(pHead->nBlockUse)
which I take to mean I am deleting an object that has been deleted (the QString in the combobox???).
If I change the code to fill the combo box with dummies:
#include <QApplication>
#include <QComboBox>
#include <QCameraInfo>
#include <iostream>
int main(int argc, char *argv[])
{
QApplication app{ argc, argv };
for(int i=0; i<2; i++)
combo.addItem(QString("la la la");
combo.show();
std::cout << combo.currentText().toStdString() << std::endl;
return app.exec();
}
I get the same error on the cout, but if I comment that line out, the application exits correctly. I am using Visual Studio 2013, Windows 7, and Qt5.
