Microsoft KB Archive/81332

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HookAll2.exe Demos WH_CALLWNDPROC & WH_GETMESSAGE Hooks

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Q81332

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The information in this article applies to:


 * Microsoft Windows Software Development Kit (SDK) 3.1

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SUMMARY
HookAll2.exe is a sample that demonstrates how to use the WH_GETMESSAGE and WH_CALLWNDPROC hooks in Windows 3.1. HookAll2.exe contains the code for a dynamic-link library (DLL) with functions that set and remove the hooks, as well as the hook filter functions. The DLL uses the new hook functions provided by Windows 3.1: SetWindowsHookEx, UnhookWindowsHookEx, and CallNextHookEx. HookAll2.exe also contains code for a TESTHOOK application that tests the DLL.

HookAll2.exe updates the HOOKALL sample to use the features provided by Windows 3.1. For more information about HOOKALL, query on the following words in the Microsoft Knowledge Base:

"hookall"

MORE INFORMATION
The following files are available for download from the Microsoft Download Center:

HookAll2.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.

With the exception of WM_LBUTTONDOWN messages, the hook filter functions pass all messages directly to the next hook function in the hook chain. When they receive a WM_LBUTTONDOWN message, the filter functions draw a rectangle of random size and color in the TESTHOOK application's client area. One corner of the rectangle is at the point where the user pressed the mouse button.

Additional query words:

Keywords : kbfile kbsample kb16bitonly kbHook kbGrpDSUser kbOSWin310

Issue type :

Technology : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310