DllImport (c#) and Qt

mrdebug

Hi. I have a dll written in Qt with a QThread object in it. The Qthread sends an event every each second to an callback in the C# program.
If the Qthread invokes the callback directly the program works. I have in the C# layer on event every second.
But If I use "connect" instead of the callback directly I never have the event.
Sounds an the event queue in the Qt dll does not starts correctly.
How can I start it?

SGaist

Hi,

You should show your code.

mrdebug

    pCallback= NULL;
    Timer= new QTimer();
    connect(Timer, SIGNAL(timeout()), this, SLOT(OnTimer()));
    Timer->start(1000);
    ThTest= new QThTest(this);
    ThTest->start();
    qDebug() << "DllTest::DllTest()";

If I use this dll with a program written in Qt che row below works perfectly.

    connect(Timer, SIGNAL(timeout()), this, SLOT(OnTimer()));

But if I use this dll with a program written in C# I never have the event. I think the problem is that a program written in Qt has got an compatible internal event queue but the C# program not.

Eddy

Hi,

You might have a look at the Dot Net Example
It explains the use of managed code with Qt.

Also, there is a similar topic

Hope it helps you in the right direction.

Eddy

jsulm

@mrdebug I guess you do not have event loop in your dll and since there is no Qt event loop in a pure C# program it does not work.

Unsolved DllImport (c#) and Qt