Programming Tips - How do I disable a Window's close button?

Date: 2008jul3 Platform: win32 Language: C/C++ Keywords: enable, disable, grey, gray, programmatically Q. How do I disable a Window's close button? The [X] thing in the top-right corner. A. Here's a little function that does the trick:
// Disable or enable the [X] button in top-right corner BOOL EnableCloseButton(const HWND hwnd, const BOOL bState) { HMENU hMenu; UINT dwExtra; if (hwnd == NULL) return FALSE; if ((hMenu = GetSystemMenu(hwnd, FALSE)) == NULL) return FALSE; dwExtra = bState ? MF_ENABLED : (MF_DISABLED | MF_GRAYED); return EnableMenuItem(hMenu, SC_CLOSE, MF_BYCOMMAND | dwExtra) != -1; }
// The MFC version... #ifdef _MFC_VER // Disable or enable the [X] button in top-right corner BOOL EnableCloseButton(const CWnd *wnd, const BOOL bState) { CMenu *menu; if (wnd == NULL) return FALSE; if ((menu = wnd->GetSystemMenu(FALSE)) == NULL) return FALSE; return menu->EnableMenuItem(SC_CLOSE, MF_BYCOMMAND | bState ? MF_ENABLED : MF_GRAYED) != -1; } #endif
// Example use: // To disable: EnableCloseButton(hwnd, FALSE); // To disable in MFC: EnableCloseButton(AfxGetMainWnd(), FALSE);