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Frequently Asked Questions

Maping a DLL into another process

Question:

Is it possible to map a DLL into another process under Win32?

Answer:

Yes, the following details one method of forcing a DLL to be mapped

into a different process under both Windows NT, and Windows 95.



Install a global WH_GETMESSAGE hook which is implemented by the

DLL. Note that you must store the HHOOK variable returned by the

SetWindowsHookEx() function (and any other global variables that are

used in the DLL) into a memory mapped file to be able to access it in

the target process. Note that any global variables contained in the

DLL will not be mapped into the other process, and will contain

uninitialized values when referenced while the DLL is mapped into the

other process(s).



PostMessage a custom message (WM_USER + something) to a window in

the target process.



When the hook traps the message the DLL will be mapped into the

target process during the processing of the message. 

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