解决Win7下UAC开启时无法响应WM_DROPFILES消息

 //以管理员身份运行，程序窗口就可以接收到拖放文件消息【WM_DROPFILES】了。
     ChangeWndMessageFilterOk(WM_DROPFILES, MSGFLT_ADD);
     ChangeWndMessageFilterOk(0x0049, MSGFLT_ADD);        // 0x0049 == WM_COPYGLOBALDATA

 BOOL CXXXFrameWnd::ChangeWndMessageFilterOk(UINT nMessage, BOOL bAllow)
 {
     typedef BOOL(WINAPI * ChangeWindowMessageFilterOkFn)(UINT, DWORD);     HMODULE hModUser32 = NULL;
     hModUser32 = LoadLibrary(_T("user32.dll"));
     if (hModUser32 == NULL) {
         return FALSE;
     }     ChangeWindowMessageFilterOkFn pfnChangeWindowMessageFilter = (ChangeWindowMessageFilterOkFn)GetProcAddress(hModUser32, "ChangeWindowMessageFilter");
     if (pfnChangeWindowMessageFilter == NULL)
     {
         FreeLibrary(hModUser32);
         return FALSE;
     }     FreeLibrary(hModUser32);     return pfnChangeWindowMessageFilter(nMessage, bAllow ? MSGFLT_ADD : MSGFLT_REMOVE);
 }

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