如何通过SendMessage设置对话框图标？

如何通过SendMessage设置对话框图标？

// Sets the dialog box icons
inline void chSETDLGICONS(HWND hwnd, int idi) {
SendMessage(hwnd, WM_SETICON, TRUE, (LPARAM)
LoadIcon((HINSTANCE) GetWindowLongPtr(hwnd, GWLP_HINSTANCE),
MAKEINTRESOURCE(idi)));
SendMessage(hwnd, WM_SETICON, FALSE, (LPARAM)
LoadIcon((HINSTANCE) GetWindowLongPtr(hwnd, GWLP_HINSTANCE),
MAKEINTRESOURCE(idi)));
}