QLibrary load inside class

[^NyAw^]

Hi,

I'm trying to load a library in runtime using QLibrary.
I'm using the QLibrary class inside a class. I'm able to call a resolved function from the library. The problem is on the next function,method, ... call. This call produces a "buffer saturation" error. If I load the library into the main it works perfectly.
I want to use the QLibrary inside a class because it will be like a plugin.

Is there any memory limitation or maybe I'm making a mistake?

Here there is the piece of code in the application constructor:

QLibrary myLib("pci-dask");
typedef I16 (*MyPrototype)(U16,U16);
MyPrototype myFunction = (MyPrototype) myLib.resolve("Register_Card");
myFunction = (MyPrototype) myLib.resolve("Register_Card");
if (myFunction)
	card = myFunction(PCI_7230,card_number);
 
m_qDAQThread.setCard(card);    //This cause the crash. Changing it to any call like a "QObject::connect" produces the same error

QLibrary myLib("pci-dask");
typedef I16 (*MyPrototype)(U16,U16);
MyPrototype myFunction = (MyPrototype) myLib.resolve("Register_Card");
myFunction = (MyPrototype) myLib.resolve("Register_Card");
if (myFunction)
	card = myFunction(PCI_7230,card_number);

m_qDAQThread.setCard(card);    //This cause the crash. Changing it to any call like a "QObject::connect" produces the same error

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If I don't call "card = myFunction(PCI_7230,card_number)", there is no problem.

Thanks,

P.S.: I'm using Qt 4.6.1 and Visual Studio 2008 on Windows XP

[^NyAw^]

Hi,

Has no one found a similar problem?

Thanks,

[^NyAw^]

Hi,

There is an option in Visual Studio "/GS" that if I disable it then I get a "0xC0000005" error.
The problem is that I there is no crash if I don't call any resolved fucntion.

m_qLibrary.setFileName("pci-dask");
if (m_qLibrary.load())
{
    //Pointer to functions
    Register_Card = (pf_Register_Card) m_qLibrary.resolve("Register_Card");
    Release_Card = (pf_Release_Card) m_qLibrary.resolve("Release_Card");
    DI_ReadPort = (pf_DI_ReadPort) m_qLibrary.resolve("DI_ReadPort");
    if (Register_Card)
        m_card = Register_Card(PCI_7230,card_number);
 
    QObject::connect(this,SIGNAL(mySignal()),this,SLOT(mySlot()));    //This produces the error
 
    if (DI_ReadPort)
        I16 error = DI_ReadPort(m_card,0,&m_uInputs);
}

m_qLibrary.setFileName("pci-dask");
if (m_qLibrary.load())
{
    //Pointer to functions
    Register_Card = (pf_Register_Card) m_qLibrary.resolve("Register_Card");
    Release_Card = (pf_Release_Card) m_qLibrary.resolve("Release_Card");
    DI_ReadPort = (pf_DI_ReadPort) m_qLibrary.resolve("DI_ReadPort");
    if (Register_Card)
        m_card = Register_Card(PCI_7230,card_number);

    QObject::connect(this,SIGNAL(mySignal()),this,SLOT(mySlot()));    //This produces the error

    if (DI_ReadPort)
        I16 error = DI_ReadPort(m_card,0,&m_uInputs);
}

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This produces the error: Excepción no controlada en 0x671d4836 (QtCored4.dll) en ADLINK_IO.exe: 0xC0000005: Infracción de acceso al leer la ubicación 0x6f6c7331.
That will be like "Exception not controlled in 0x671d4836 (QtCored4.dll) in ADLINK_IO.exe: 0xC0000005: error on reading 0x6f6c7331."

Thanks,