How to get WinMain function's params in Qt's main function?

gaojinhsu

this is how Qt's main function is called. how can I get hInstance, hPrevInstance, lpCmdLine and nShowCmd?

int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd)

extern "C" int APIENTRY WinMain(HINSTANCE, HINSTANCE, LPSTR /*cmdParamarg*/, int /* cmdShow */)
{
    int argc = 0;
    wchar_t **argvW = CommandLineToArgvW(GetCommandLineW(), &argc);
    if (argvW == nullptr)
        return -1;
    char **argv = new char *[argc + 1];
    for (int i = 0; i != argc; ++i)
        argv[i] = wideToMulti(CP_ACP, argvW[i]);
    argv[argc] = nullptr;
    LocalFree(argvW);
    const int exitCode = main(argc, argv);
    for (int i = 0; (i != argc) && (argv[i] != nullptr); ++i)
        delete [] argv[i];
    delete [] argv;
    return exitCode;
}

Chris Kawa

@gaojinhsu These parameters get abstracted away by Qt into the cross-platform form.

To get the lpCmdLine which is basically the command line parameters you can use QCoreApplication::arguments(). This gets you the arguments as a list of QStrings.
If you want the command line in native form you can use the WinAPI GetCommandLineA() function.

To get hInstance you can use a native call to GetModuleHandle(NULL). This will get you the handle to the current executable (which is usually what you mean unless you somehow modified Qt app to run entirely as a DLL, then you need the DLL name passed as the parameter).

As for hPrevInstance this is a legacy parameter that on any 32 or 64 bit Windows is always null. It's a leftover from a 16 bit OS days, so you can safely ignore it or assume null if you need to.

JonB

@gaojinhsu
So far as I know, to access these individual top-level parameters to WinMain() you would need to provide your own definition code for this function, e.g. as per above.

gaojinhsu

@JonB you mean by modifying Qt's soruce code and compile it again?

Chris Kawa

@gaojinhsu These parameters get abstracted away by Qt into the cross-platform form.

To get the lpCmdLine which is basically the command line parameters you can use QCoreApplication::arguments(). This gets you the arguments as a list of QStrings.
If you want the command line in native form you can use the WinAPI GetCommandLineA() function.

To get hInstance you can use a native call to GetModuleHandle(NULL). This will get you the handle to the current executable (which is usually what you mean unless you somehow modified Qt app to run entirely as a DLL, then you need the DLL name passed as the parameter).

As for hPrevInstance this is a legacy parameter that on any 32 or 64 bit Windows is always null. It's a leftover from a 16 bit OS days, so you can safely ignore it or assume null if you need to.

gaojinhsu

@Chris-Kawa That' s exactly what I want, thank you.