How do I intercept and change a message sent to a control?

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I have a static control on my dialog. I give the handle of the control to a third party DLL, which sends WM_SETTEXT messages directly to it.

However, now I find I might want to intercept that message and change the text. How do I do it?

What I have tried:

I've tried PreTranslateMessage in my dialog. All ON_NOTIFY and ON_REFLECT macros.

I think I might need a hook - but the documentation says I'm not allowed to modify the message using a hook?

Posted 24-May-21 12:11pm

Kyudos

Updated 24-May-21 21:55pm

v2

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2 solutions

Solution 2

In addition to Rick's suggestion you can subclass a control which allows you to intercept all messages. See Subclassing Controls - Win32 apps | Microsoft Docs[^].

Posted 24-May-21 21:55pm

Richard MacCutchan

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Maciej Los 25-May-21 3:59am

5ed!

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Rick York · Accepted Answer · 2021-05-24T12:44:00

Solution 1

You can make a new class, derive it from CStatic, and let it handle all the messages you want it to and exactly how you want it to. As an example, see the CLabel class here : Extended Use of CStatic Class - CLabel 1.6[^]. That class is derived from CStatic and has facilities to change the font, colors, and other properties.

Posted 24-May-21 12:44pm

Rick York

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Maciej Los 25-May-21 3:59am

5ed!