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Editorial Team
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Asked: 2026-05-24T17:09:37+00:00

I created an MFC dialog based app and wanted to add timer on the

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I created an MFC dialog based app and wanted to add timer on the form. But it turns out that MFC is different than the .NET windows forms.

I added the ON_WM_TIMER() in the messagemap. and added the function definition for CMyDialog::OnTimer(UINT_PTR x)
{
}

But I am getting a compiler error in VS2005. I do not know what i am doing wrong.
“error C2509: ‘OnTimer’ : member function not declared in ‘CMyDialog'”

Help is greatly appreciated. Thanks.

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1 Answer

  1. Editorial Team

    Obviously, you forgot to declare the function in MyDialog.h, in CMyDialog declaration:

    afx_msg void OnTimer(UINT_PTR x);

    Note that afx_msg is purely informative and can be omitted.

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