C++ Starting several modeless dialogs using WINAPI ( no MFC )

Question

I have been trying to get my program to display different modeless dialog boxes when different menu items are selected. So far I am only working on displaying 1 but I am unable to get this working.

When I run my code I can see the main window losing focus but the about dialog box is not being displayed.

HWND g_hToolbar = NULL;
HWND hDlgCurrent = NULL;

int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR    lpCmdLine,
int       nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);

MSG msg;
HACCEL hAccelTable;

LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_GUIAPP, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
    return FALSE;
}

while(GetMessage(&msg, NULL, 0, 0) > 0)
{
    if(!IsDialogMessage(g_hToolbar, &msg))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
}
return (int) msg.wParam;
}

Here is the code for my about box:

INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{

UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_CREATE:
    g_hToolbar = CreateDialog(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_ABOUTBOX),
        hDlg, ToolDlgProc
        );
    if(g_hToolbar != NULL)
    {
        ShowWindow(g_hToolbar, SW_SHOW);
    }
case WM_INITDIALOG:
    return (INT_PTR)TRUE;

case WM_ACTIVATE:
    if (0 == wParam)             // becoming inactive
        hDlgCurrent = NULL;
    else                         // becoming active
        hDlgCurrent = hDlg;
    return FALSE;

case WM_COMMAND:
    if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDOK)
    {
        EndDialog(hDlg, LOWORD(wParam));
        return (INT_PTR)TRUE;
    }
    break;
}
return (INT_PTR)FALSE;
}

Then my Call in WndProc

    case IDM_ABOUT:
        CreateDialog(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);        
        break;

I apologize for pasting such large sections of code in but I am unaware as to where exactly the problem is.

Any help on this would be great!

The code creating modal dialog is missing. And apparently that code is what you're asking about. Anyway, if you code in C++ instead of C things would become much more clear and safe. Be aware that `tWinMain` monstrosity is neither standard C, nor standard C++, and that it serves no technical purpose. It is only Microsoft obfuscation, so, use a standard `main`. Also, it helps to not use global variables. And don't use C style casts, in general. — Cheers and hth. - Alf, Apr 23 '12 at 13:15
Why does your `WM_CREATE` handler try and create the dialog again? — Deanna, Apr 23 '12 at 13:18
I have solved the Issue. There was no need to have g_hToolbar creating dialogs too. I just moved `ShowWindow(g_hToolbar, SW_SHOW);` to `WM_INITDIALOG` and its working for me. — Daniel Flannery, Apr 23 '12 at 13:21

score 0 · Accepted Answer · answered Apr 24 '12 at 10:54

0

This issue has been solved.

The solution is contained in the comments.

answered Apr 24 '12 at 10:54

Daniel Flannery

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C++ Starting several modeless dialogs using WINAPI ( no MFC )

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