QCoreApplication::instance() returning NULL

[PaulOfford]

I am developing a plugin for an Qt application called Wireshark. The plugin is built into a Windows DLL that is detected at Wireshark startup time.

I want to reference the QCoreApplication in the DLL. I've tried using QCoreApplication::instance() but it return a NULL pointer.

The main application class is defined like this:

class WiresharkApplication : public QApplication
{
    Q_OBJECT
public:
    explicit WiresharkApplication(int &argc,  char **argv);
.
.

And it's instantiated in main.

I've read that there is a problem with QCoreApplication::instance() and release and debug builds - see http://www.qtcentre.org/archive/index.php/t-45574.html

Is this an actual problem?

I'm using Visual Studio 2013 to develop the code.

Thanks and regards...Paul

[dheerendra]

In fact this should not give the problem. It should return the right value object value. It does not matter from where you are calling. I have used this many times on linux and Mac, It works fine. I'm sure this will not help you. Can I send my simple plugin and app code which you can check ? Hope your plugin and exe are either in release or debug mode and NOT criss-crossed.

[PaulOfford]

@dheerendra Hi - I might take you up on the offer of trying your code but let me try to fix what I have first. The build process for Wireshark is extremely complex and so I think I should check that I have criss crossed the build and debug status.