SetWindowLongPtr fails when window is subclassed for some cases.

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Win32

Hello,

1. I have injected a my own DLL into IE-8, when DLLMain is called i have sub-classed IE-8 main window procedure.

2. After sub-classing the main window i have sub-classed a window where i put my caret. That is when i click at TextBox that window is sub-classed.

3. This is working fine with all other application and versions (IE7 and lower also mozilla) but fails in IE8 and get a Error Code : 5 (Access Denied)


4. Even I have checked the my application thread and process priority with IE-8 so it found same.

Can anybody suggest why this is happening so that i can extract a solution from it.

Thanks