vc6中 EnumDisplayDevices 判断扩展屏幕，以及取得扩展屏幕的示例代码。

# define          SM_CMONITORS          80
/ /    int screen_count = ::GetSystemMetrics( SM_CMONITORS );
BOOL EnumDisplayDevices (
   LPCTSTR lpDevice ,                  / / device name
   DWORD iDevNum ,                     / / display device
   PDISPLAY_DEVICE lpDisplayDevice , / / device information
   DWORD dwFlags                      / / reserved
) ;

typedef BOOL ( __stdcall * pEnumDiaplayDevices ) (    LPCTSTR lpDevice ,                  / / device name
   DWORD iDevNum ,                     / / display device
   PDISPLAY_DEVICE lpDisplayDevice , / / device information
   DWORD dwFlags                      / / reserved
) ;

int
GetScreenRect ( int ScreenNo , RECT * rect )
{
     pEnumDiaplayDevices xenum ;
     BOOL flag ;
     DISPLAY_DEVICE dd ;
     ZeroMemory ( & dd , sizeof ( dd ) ) ;
     dd . cb = sizeof ( dd ) ;
     HMODULE hhh = LoadLibrary ( _T ( "user32.dll" ) ) ;
     if ( hhh )
     {
         xenum = ( pEnumDiaplayDevices ) GetProcAddress ( hhh , "EnumDisplayDevicesW" ) ;
     }
     if ( ! xenum )
     {
         FreeLibrary ( hhh ) ;
         return 1 ;
     }

     / /flag = EnumDisplayDevices( NULL, ScreenNo, &dd, 0 );
     flag = xenum ( NULL , ScreenNo , & dd , 0 ) ;

     if ( ! flag )
     {
         FreeLibrary ( hhh ) ;
         return 1 ;
     }

     DEVMODE dm ;
     ZeroMemory ( & dm , sizeof ( dm ) ) ;
     dm . dmSize = sizeof ( dm ) ;
     flag = EnumDisplaySettings ( dd . DeviceName , ENUM_CURRENT_SETTINGS , & dm ) ;
     rect - > left = dm . dmPosition . x ;
     rect - > top = dm . dmPosition . y ;
     rect - > right = dm . dmPelsWidth ;
     rect - > bottom = dm . dmPelsHeight ;

     FreeLibrary ( hhh ) ;
     return 0 ;
}

/ /*************************
/ / 简单测试代码
/ /*************************
   RECT rec ;
     int result = GetScreenRect ( 1 , & rec ) ;
     if ( rec . left = = rec . right )
     {
         / / 没找到第二显示器，随便判断一下，不严格

vc6中 EnumDisplayDevices 判断扩展屏幕，以及取得扩展屏幕的示例代码。

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