SAMPLE: HookAll2.exe Demos WH_CALLWNDPROC & WH_GETMESSAGE Hooks

ID: Q81332

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) for Windows version 3.1

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 file is available for download from the Microsoft Software Library:

 ~ HookAll2.exe (size: 26821 bytes)

For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online Services

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 kbGrpUser kbWinOS310

Last Reviewed: December 10, 1998