How to exclude a thread from global hook.

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Hi,

We are hooking TextOut(),ExtTextOut() and DrawText() methods GLOBALLY.

i.e.
hhook = SetWindowsHookEx(WH_CBT, function_address, module_handle, 0);

But we want to exclude our application (which we are using to install/uninstall hook) from being hooked. If the last argument to "SetWindowsHookEx()" is 0(zero) it will hook all the existing threads.How to check here if the current thread is "OurApplication.exe" and then exclude it from hooking or immediately unhook it.

Please provide help.

Thank you :)

Posted 24-Jan-10 21:30pm

helpseeker123

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2 solutions

Solution 2

Hi All,
We found the way to do that. Now we added the following block of code in the entry point of the injecting dll.And it is working fine.

BOOL APIENTRY DllMain(HINSTANCE hModule, DWORD dwReason, PVOID lpReserved)  <br />
{    <br />
    switch (dwReason)  <br />
    { <br />
       case DLL_PROCESS_ATTACH: <br />
           IsDebuggerPresent(); <br />
 <br />
           // Exclude the "someapplication.exe" from hooking <br />
           GetModuleFileName( GetModuleHandle( NULL ),Work,sizeof(Work) ); <br />
           PathStripPath(Work ); <br />
 <br />
           if ( _stricmp( Work, "someapplication.exe" ) != 0 ) <br />
           { <br />
              InstallWindowHooks(); <br />
           } <br />
 <br />
         break; <br />
       case DLL_PROCESS_DETACH: <br />
           hWindowReceiver = NULL; <br />
           CleanUp(); <br />
         break;      <br />
    } <br />
    return TRUE; <br />
}

Thank you.

Posted 25-Jan-10 2:30am

helpseeker123

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Jast_in · Accepted Answer · 2010-01-25T01:53:00

Solution 1

Look at 2 answers to your first question about the same problem! :)

Posted 25-Jan-10 1:53am

Jast_in