This article was previously published under Q222829
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Note Microsoft Visual C++ .NET (2002) supports both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code.
Accelerator keys are a common User Interface feature of Windows applications; therefore, why limit them to just the application? This article shows how to add accelerator key functionality to any modal dialog box.
Keyboard accelerators are processed by calling the TranslateAccelerator() function in the application's main message loop. However, for a modal dialog box, the dialog box manager message loop (built into Windows) is used to translate and dispatch messages. Of course, because this message loop is not designed to process accelerators, it does not call the TranslateAccelerator() function.
To process accelerator keys in a modal dialog box, you must override the dialog box's PreTranslateMessage() function and try to process the message as an accelerator by calling ::TranslateAccelerator(). If this method fails, then processing continues by calling the base class PreTranslateMessage().
For the purposes of this article, we add accelerator key functionality to the AboutBox dialog box of an MFC MDI application:
Create a new MFC MDI application named Test.
Add a button, with resource ID "IDC_BUTTON1", to the AboutBox dialog box resource.
Double-click the button to add a handler for this button and insert the following code as an indicator that the accelerator key works:
Insert a new Accelerator Table to the Resource.
Add an Accelerator key to the table by associating the F5 key to the resource ID "IDC_BUTTON1".
Add the member variable, m_hAccelTable, to the class CAboutBox: