siddhs
Level: Professor
Registered: 02-03-2003
Posts: 92
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Re: Hook Programming
hiiiii
HOOK ........the toughest to write one in VB.
A hook is a point in the system message-handling mechanism where an application can install a subroutine to monitor the message traffic in the system and process certain types of messages before they reach the target window procedure. To install a hook use SetWindowsHookEx() function. It takes 4 parameters
There are two types of Hooks - Thread specific hooks and Systemwide hooks. A thread specific hook is associated with particular thread only (Any thread owned by the calling process.). If you want to associate the hook with other processes and threads, you will have to use a systemwide hook. There is a hook procedure associated with a hook. This procedure is always called when the particular event occurs. For eg. the mouse. When there is an event associated with the mouse, this hook procedure is called. The hook is set by calling the function SetWindowsHookEx( ). The hook is removed by calling UnhookWindowsHookEx( ).
For thread hooks, the hook procedure may be in an EXE file or a DLL. But for Global or System hooks, the hook procedure must reside in a DLL. For this, we need to create a DLL.
To do this, create a Win32 DLL project with only the starter files in it and modify it to suit your needs. It is better to put the code for installing and removing the hook in the DLL itself.
Just some notes
Siddhs
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