What messages are sent when you connect an external display

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Hi,

Does anyone know what kind of messages or events are sent when you connect an external display to your system?
I noticed that my program went to adjust some of the dialogs when a second display was connected and I'm trying to figure out how to supress them or make them work for me.

If you can point me to a site which explains more of these messages, that will be great too.

Posted 3-May-12 22:08pm

amsga

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Richard MacCutchan 4-May-12 6:23am

I'm not sure of the answer, but if you have a retail version of Visual Studio you can use Spy++ to track the messages.

enhzflep 4-May-12 13:23pm

Further to what Richard said, you can get free versions of essentially the same tool.
I had the same idea moments ago and just saw his response now.
When I plug-in a second display to my laptop, the new screen becomes my primary monitor and all output is directed to it, while the laptop's panel is turned off. This may mean there are extra/missing messages.

I'm receiving:
WM_DISPLAYCHANGE
WM_DEVICECHANGE
WM_SETTINGSCHANGE

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Espen Harlinn · Accepted Answer · 2012-05-04T09:20:00

Solution 1

Have a look at WM_DISPLAYCHANGE[^]

And this Driver Development Part 6: Introduction to Display Drivers[^] provides extra information that you will find useful.

Best regards
Espen Harlinn

Posted 4-May-12 9:20am

Espen Harlinn

Comments

Sergey Alexandrovich Kryukov 5-May-12 22:18pm

Good information, a 5.
--SA

Espen Harlinn 7-May-12 3:00am

Thank you, Sergey :-D

Wendelius 23-May-12 0:10am

That should help!

Espen Harlinn 23-May-12 4:29am

Thank you Mika :-D