Win32 API Window messages WM_DESTROY
Example
This message is sent to your window procedure when a window is being destroyed. It is sent after the window is removed from the screen. Most applications free any resources, like memory or handles, obtained in WM_CREATE. If you handle this message, return 0.
LRESULT CALLBACK winproc(HWND hwnd, UINT wm, WPARAM wp, LPARAM lp)
{
static char *text;
switch (wm) {
case WM_CREATE:
text = malloc(256);
/* use the allocated memory */
return 0;
case WM_CLOSE:
switch (MessageBox(hwnd, "Save changes?", "", MB_YESNOCANCEL)) {
case IDYES:
savedoc();
/* fall through */
case IDNO:
DestroyWindow(hwnd);
break;
}
return 0;
case WM_DESTROY:
/* free the memory */
free(text);
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, wm, wp, lp);
}
