Win32 API WM_CREATE
示例
在窗口CreateWindowEx调用期间，WM_CREATE消息发送到您的窗口过程。该lp参数包含一个指向CREATESTRUCT包含传递给参数CreateWindowEx。如果应用程序从WM_CREATE返回0，则创建窗口。如果应用程序返回-1，则创建将被取消。
LRESULT CALLBACK winproc(HWND hwnd, UINT wm, WPARAM wp, LPARAM lp)
{
switch (wm) {
case WM_CREATE:
CREATESTRUCT *cs = (CREATESTRUCT *) lp;
if (MessageBox(hwnd,
"Do you want to continue creating the window?", "", MB_YESNO)
== IDYES) {
/* create window controls */
return 0;
}
/* cancel creation */
return -1;
}
return DefWindowProc(hwnd, wm, wp, lp);
}