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Set Primary Display (ChangeDisplaySettingsEx)

, 11 Aug 2009 CPOL
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Simplified code for setting the primary display on a multi-monitor PC.

Introduction

I've seen plenty of "complicated" code for setting the "primary" display in a multiple display PC environment, but never a "simple" C# version. (This code is based off plenty of samples I've seen on the web.)

Background

This code originated out of the need to pop applications to multiple monitors during an automated start-up script (i.e., set a designated monitor as primary, start apps, then revert back to original monitor).

Using the code

The code is left raw for addition of "bells and whistles".

//manual gather - NewPrimary name ----------------------------------
WinApi.DISPLAY_DEVICE ddOne = new WinApi.DISPLAY_DEVICE();

ddOne.cb = Marshal.SizeOf(ddOne);
deviceID = 1;
WinApi.User_32.EnumDisplayDevices(null, deviceID, ref ddOne, 0);
string NewPrimary = ddOne.DeviceName;

WinApi.DEVMODE ndm6 = NewDevMode();
result = (WinApi.DisplaySetting_Results)WinApi.User_32.ChangeDisplaySettingsEx(NewPrimary, 
          ref ndm6, (IntPtr)null, (int)WinApi.DeviceFlags.CDS_SET_PRIMARY | 
          (int)WinApi.DeviceFlags.CDS_UPDATEREGISTRY, IntPtr.Zero);
Console.WriteLine("Action 3.2 result:" + result.ToString());

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

beyonder422
Systems Engineer
United States United States
No Biography provided

Comments and Discussions

 
SuggestionWorking VB.Net "Conversion" PinmemberLostIt127823-Jan-13 17:55 
GeneralRe: Working VB.Net "Conversion" [modified] PinmemberLostIt127824-Feb-13 8:59 
GeneralDoes not work for me. PinmemberBill Langlais2-Nov-09 14:02 
GeneralManually set monitor\display name Pinmemberbeyonder42211-Aug-09 6:48 
GeneralRe: Manually set monitor\display name PinmemberThe_Mega_ZZTer11-Aug-09 7:51 
GeneralRe: Manually set monitor\display name Pinmemberdalek925-Aug-09 3:23 

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