Why are my WINAPI messages not reaching my window procedure? - c

Question

I am using a winapi dialog as my root HWND for a window class. The program compiles and displays perfectly, but when I click on the buttons, nothing is responsive, almost like the messages aren't reaching my window procedure, or said procedure is never being called. How can I ensure that the messages are working correctly and I'm handling them properly for what I'm trying to do?
Simplified WinMain in main.c:
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
static char szAppName[] = TEXT ("AppName"); // Does not display, remove later
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = DlgProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = DLGWINDOWEXTRA;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MAIN));
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
wndclass.lpszMenuName = MAKEINTRESOURCE(IDC_MAINMENU);
wndclass.lpszClassName = szAppName;
if (!RegisterClass(&wndclass))
{
MessageBox(NULL,
TEXT("This program requires Windows NT!"),
szAppName,
MB_ICONERROR);
return 0;
}
hwnd = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_MAIN), 0, NULL);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
Simplified DlgProc (written in C++ and registered for use in C):
LRESULT CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
switch(Message)
{
case WM_INITDIALOG:
MessageBeep(0); // Does not sound, even if I change the case to WM_CREATE
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
// Handle buttons/statics inside the dialog, they do nothing
}
case WM_CLOSE:
EndDialog(hwnd, 0);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return FALSE;
}
return TRUE;
}
dialog in resource file:
IDD_MAIN DIALOG DISCARDABLE 0, 0, 207, 156
STYLE WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX
CAPTION "AppTitle"
FONT 8, "MS Sans Serif"
BEGIN
// Internal statics and buttons
END
Any help is appreciated. Thanks!

Answer 1

Follow the Using the code which is in Microsoft GitHub repository steps to complete your program. You should set your dialog Class Name = AppName in resource file and Change WM_INITDIALOG back to WM_CREATE in WndProc that you call DlgProc.