Microsoft KB Archive/100357

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SAMPLE: Xtenaccl.exe - Accelerators for File Manager Extensions

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Q100357

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
Xtenaccl.exe is a sample that installs a task-specific message hook (WH_GETMESSAGE) and calls TranslateAccelerator on every WM_KEY and WM_KEYDOWN message. If an appropriate accelerator is found, TranslateAccelerator passes a WM_COMMAND to the main window. File Manager extensions cannot directly use accelerators because extensions do not have their own message pump. File Manager pulls messages on behalf of the extensions, and does not load and translate extension's accelerators.

MORE INFORMATION
The following file is available for download from the Microsoft Download Center:

"Xtenaccl.exe" For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:

"Q119591 How to Obtain Microsoft Support Files from Online Services" Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that prevent any unauthorized changes to the file.

The main window of File Manager handles and processes the WM_COMMAND message passed to it by TranslateAccelerator. However, File Manager does not know how to handle that message because wParam (containing menu IDs) is defined by the extension. To interpret the correct value, File Manager dynamically changes an extension's menu IDs to suit its own needs. Therefore, XTENACCL traps the WM_COMMAND message passed by TranslateAccelerator and routes it to a child window of its own. The child window in turn processes the menu command.

To intercept the WM_COMMAND message, XTENACCL is using a second message hook that is of type WH_CALLWNDPROC. Because TranslateAccelerator sends a WM_COMMAND instead of posting it, this second hook was needed.

Additional query words: 0 file manager extension

Keywords : kbfile kbsample kb16bitonly kbFileManExt kbHook kbInput kbKeyAccel kbGrpDSUser kbOSWin310 kbGrpDSShell

Issue type :

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310