Start Win32 dialog from Qt Application

OlexandrLynda

I need some help with Win32. I`m working in VS2015.
my win32 dialog class:

class AddProcedureType
{
public:
    AddProcedureType();
    ~AddProcedureType();
    static BOOL CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam);

private:
    HWND hDialog;
    static AddProcedureType *ptr;
    void Cls_OnClose(HWND hwnd);
    BOOL Cls_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam);
    void Cls_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify);
};

And I want to call that window from Qt Application:

void getAddProcedureTypeDialog(WId id)
{
    AddProcedureType dlg;
    HINSTANCE h = GetModuleHandle(NULL);
    std::cout << "Error code : ";
    std::cout << DialogBox(h, MAKEINTRESOURCE(IDD_MAIN), (HWND)id, dlg.DlgProc);
    std::cout << "\nGetLastError() : " << GetLastError() << std::endl;
    std::cout << "CommDlgExtendedError() : " << CommDlgExtendedError() << std::endl;
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    getAddProcedureTypeDialog(this->winId());
}

But when I ran program it shows only Qt App without win32 dialog.
And out is :

Error code : -1
GetLastError() : 0
CommDlgExtendedError() : 0

P.S. I know about Qt Dialogs, but in this case I need Win32 dialog.

Chris Kawa

Hi, welcome to devnet.

I tried out a stripped down version of your code and it works fine. Could you try it on your side too?

INT_PTR CALLBACK DialogProc( HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    if(uMsg == WM_CLOSE)
    {
        EndDialog(hwndDlg, 0);
        return TRUE;
    }
    return FALSE;
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    HINSTANCE h = GetModuleHandle(NULL);
    DialogBox(h, MAKEINTRESOURCE(IDD_MAIN), (HWND)winId(), DialogProc);
}

OlexandrLynda

@Chris-Kawa Are you using VS 2015?

and my dlgProc is :

BOOL CALLBACK AddProcedureType::DlgProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
		HANDLE_MSG(hWnd, WM_CLOSE, ptr->Cls_OnClose);
		HANDLE_MSG(hWnd, WM_INITDIALOG, ptr->Cls_OnInitDialog);
		HANDLE_MSG(hWnd, WM_COMMAND, ptr->Cls_OnCommand);
	}
	return FALSE;
}

Chris Kawa

Are you using VS 2015?

Yes.

I wanted you to try the simpler example without extra classes and indirections to see if it's a problem in your code or more general.

OlexandrLynda

@Chris-Kawa My mentor helped me, the problem was that I need to include resource.rc file to project.