DOCUMENT:Q197671  21-OCT-2000  [winnt]
TITLE   :HOWTO: How to Enumerate Monitors in Win 98 and Windows 2000
PRODUCT :Microsoft Windows NT
PROD/VER::; WINDOWS:
OPER/SYS:
KEYWORDS:kbOSWin2000 kbSDKPlatform kbGrpDSUser kbOSWin98

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The information in this article applies to:

 - Microsoft Windows 2000 Advanced Server 
 - Microsoft Windows 2000 Server 
 - Microsoft Windows 2000 Professional 
 - Microsoft Windows 98 
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product. The information in this article is provided as-is
and is subject to change without notice.
No formal product support is available from Microsoft for
this Beta product. For information about obtaining support
for a Beta release, please see the documentation included
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SUMMARY
=======

Starting with Microsoft Windows 98 and Microsoft Windows 2000, multiple monitors
could be attached to a computer and connected to the desktop. This article
contains sample code showing how to enumerate those devices attached to the
desktop.

MORE INFORMATION
================

The following code is for a small console-mode application that enumerates the
attached display devices:

Sample Code
-----------

      #include <windows.h>
      #include <stdio.h>
      #ifndef SM_CMONITORS

          typedef HANDLE HMONITOR;

      #endif
      #ifndef DISPLAY_DEVICE_PRIMARY_DEVICE

          typedef struct _DISPLAY_DEVICE {
           DWORD  cb;
           TCHAR  DeviceName[32];
           TCHAR  DeviceString[128];
           DWORD  StateFlags;
          } DISPLAY_DEVICE, *PDISPLAY_DEVICE, *LPDISPLAY_DEVICE;
          #define DISPLAY_DEVICE_ATTACHED_TO_DESKTOP 0x00000001
          #define DISPLAY_DEVICE_MULTI_DRIVER        0x00000002
          #define DISPLAY_DEVICE_PRIMARY_DEVICE      0x00000004
          #define DISPLAY_DEVICE_VGA             0x00000010

      #endif

      main (int argc, char**argv)
      {

       int i;
      int j=0;
       BOOL (WINAPI* pEnumDisplayDevices)(PVOID,DWORD,PVOID,DWORD);

       (FARPROC)pEnumDisplayDevices = GetProcAddress(
           LoadLibrary("USER32"), "EnumDisplayDevicesA");

       if (pEnumDisplayDevices)
       {
           DISPLAY_DEVICE dd;
           ZeroMemory(&dd, sizeof(dd));
           dd.cb = sizeof(dd);

           printf("*** EnumDisplayDevices\n");

           for (i=0; (*pEnumDisplayDevices)(NULL, i, &dd, 0); i++)
           {
            j++;
               printf("    DeviceName:   '%s'\n", dd.DeviceName);
               printf("    DeviceString: '%s'\n", dd.DeviceString);
               printf("    Flags:        %08X %s%s\n",
                   dd.StateFlags,
                   ((dd.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP) ?
   "Desktop " : ""),

                   ((dd.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE) ? "Primary

   " : ""));

              }
          }

      return j;
      }

REFERENCES
==========

MSDN VC++ Documentation

Additional query words:

======================================================================
Keywords          : kbOSWin2000 kbSDKPlatform kbGrpDSUser kbOSWin98 
Technology        : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWin98search kbWinAdvServSearch kbWin98
Version           : :; WINDOWS:
Issue type        : kbhowto

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