Full Screen Detection Method

In Windows, this problem is often encountered. Check whether an application is in full screen status. If yes, you need to perform some special actions.

I tried different methods,

Method 1: Check the hwnd of the four corners to see if they are in the same window. Normally, an application such as the player is in full screen with a progress control bar, as a result, four corners belong to two different windows.

Method 2: register the desktop toolbars. When a full screen program is opened or closed, there will be an abn_fullscreenapp Message notification, which can be processed after it is received.

 

The two methods are listed below:

Method 1:

bool   IsFullScreen(){    HWND   pWnd1   =   NULL;    HWND   pWnd2   =   NULL;    HWND   pWnd3   =   NULL;    HWND   pWnd4   =   NULL;    int iCx=GetSystemMetrics(SM_CXSCREEN);    int iCy=GetSystemMetrics(SM_CYSCREEN);    POINT   pt1;    pt1.x   =   1;    pt1.y   =   1;    POINT   pt2;    pt2.x   =   1;    pt2.y   =   iCy-1;    POINT   pt3;    pt3.x   =   iCx-1;    pt3.y   =   1;    POINT   pt4;    pt4.x   =   iCx-1;    pt4.y   =   iCy-1;    pWnd1   =   WindowFromPoint(pt1);    pWnd2   =   WindowFromPoint(pt2);    pWnd3   =   WindowFromPoint(pt3);    pWnd4   =   WindowFromPoint(pt4);    if (pWnd1   ==   pWnd2   &&   pWnd2   ==   pWnd3   &&   pWnd3   ==   pWnd4)    {        return true;    }    return false;} 

In fact, except for full screen of IE, none of the above methods have been tried successfully.

 

Method 2:

// Take dialog as an example. xdlg. hclass cxdlg {//... appbardata m_abd; //...}; xdlg. cpp

#define UM_APPBARIDWM_USER+1BEGIN_MESSAGE_MAP(cxdlg, CDialogEx)// ...    ON_WM_POWERBROADCAST()// ...END_MESSAGE_MAP()BOOL cxdlg::OnInitDialog(){// ...memset(&m_abd, 0, sizeof(APPBARDATA));m_abd.cbSize = sizeof(APPBARDATA);  m_abd.hWnd = this->m_hWnd;m_abd.uCallbackMessage = UM_APPBARID;  ::SHAppBarMessage(ABM_NEW, &m_abd);  // ...}
LRESULT cxdlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam){// TODO: Add your specialized code here and/or call the base classif (UM_APPBARID == message)  {TRACE(TEXT("==><== Get UM_APPBARID ... /n"));switch((UINT)wParam)  {  case ABN_FULLSCREENAPP:  {if (TRUE == (BOOL)lParam){TRACE(TEXT("GetFullScreen On/n"));}else{TRACE(TEXT("GetFullScreen Off/n"));}}break;default:break;} }
return CDialogEx::WindowProc(message, wParam, lParam);}