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MFC, Determine if \'this\' app has focus

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Determine if 'this' app has focus.
Using MFC.

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  1. static HWND hWnd2 = (HWND)-1;
  2.    HWND hWnd = ::GetForegroundWindow();
  3.  
  4.    if ( hWnd2==hWnd )
  5.    {
  6.       return;
  7.    }
  8.  
  9.    hWnd2 = hWnd;
  10.  
  11.    int slength = ::GetWindowTextLength(hWnd) + 1; // length of its title bar text
  12.    CString wintext;
  13.    ::GetWindowText(hWnd, wintext.GetBufferSetLength(slength), slength); // get title bar text
  14.    wintext.ReleaseBuffer();
  15.  
  16.    DWORD dwProcessIdFocus;
  17.    // Use Windows API GetWindowThreadProcessId to find the window's process ID.
  18.    GetWindowThreadProcessId( hWnd, &dwProcessIdFocus );
  19.  
  20.    // Use Windows API GetCurrentProcessId to find 'this' process ID.
  21.    DWORD dwProcessIdParent = GetCurrentProcessId();
  22.  
  23.    bool thisAppHasFocus = dwProcessIdFocus==dwProcessIdParent;
  24.  
  25.    CString msg;
  26.    msg.Format( 
  27.       "%s%s
  28. "
  29.       "HWND: 0x%X
  30. "
  31.       "Process ID: %d",
  32.       wintext.GetLength() ? wintext : "(null)",
  33.       thisAppHasFocus ? " (me)" : "",
  34.       hWnd,
  35.       dwProcessIdFocus
  36.    );

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