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How to pass WM_CTLCOLORBTN to a ActiveX Control

Posted on 1998-08-05
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Last Modified: 2013-11-19
I'm trying to send a WM_CTLCOLORBTN message to a Active Control.  That control has been created by the MFC Control Wizard.
Using other application, I'm calling the PostMessage to send WM_CTLCOLORBTN msg to the ActiveX Control, but it isn't receiving the msg.
I've put the ON_MESSAGE( WM_CTLCOLORBTN, OnColorBtn ) statement inside the Control and implemented the OnColorBtn() method.
I've seen that no message arrived in OnColorBtn.
Important: I did the following test:
  I replaced WM_CTLCOLORBTN by a WM_USER + xxx and it worked.  So, it seems that there's some trick to MFC ActiveX work with WM_CTLCOLORBTN.
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Question by:edsont
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Expert Comment

by:Tommy Hui
ID: 1320274
Instead of using ON_MESSAGE(WM_CTLCOLORBTN), try using

 ON_MESSAGE(OCM_CTLCOLORBTN, xxx)

instead.
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Author Comment

by:edsont
ID: 1320275
I've already tried using ON_MESSAGE(OCM_CTLCOLORBTN, xxx) but
that solution didn't work in my case.

Could it be caused by the options I've checked in ActiveX ControlWizard ?

    Normal features I've checked:

         [ ] Activates when visible
         [x] Invisible at runtime
         [ ] Available in "Insert Object" dialog
         [ ] Has an "About" box
         [x] Acts as a simple frame control

    Advanced ActiveX enhancements:

         [x] Windowless activation
         [ ] <Other options are unchecked>

If the OCM_CTLCOLORBTN isn't arriving to my ActiveX Control because of the options I've checked, what could I do to fix the problem ?

Regards.

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Author Comment

by:edsont
ID: 1320276
Adjusted points to 150
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Accepted Solution

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Answers2000 earned 300 total points
ID: 1320277
You can't do this because WM_CTLCOLOR messages are actually sent to the parent of the control (in the app rather than the ActiveX) and then under normal circumstances reflected.

Get round this by using a stock property in the ActiveX control you develop to control the color of display.
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Author Comment

by:edsont
ID: 1320278
Answers2000,

Could you give an example of your proposed solution ?

Regards.

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