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C#.NET 으로 전역후킹 프로그램 만들때 주의사항..(WH_GETMESSAGE) 본문

Programming/C#

C#.NET 으로 전역후킹 프로그램 만들때 주의사항..(WH_GETMESSAGE)

Only Young - 수신 smok95 2008.12.12 00:31

C#으로 전역후킹 프로그램을 구현하시려는 분이 계시면..
WH_GETMESSAGE는 지원이 되지 않는다는 점을 꼭 숙지 하시기 바랍니다.

이걸로 한 3일은 삽질을 했습니다..

아래는 관련 내용입니다.





Dear Alex,

As far as I know to globally hook the unicode characters, we have to hook
the WM_IME_COMPOSITION message, but as explained in this KB article:

How to set a Windows hook in Visual C# .NET
http://support.microsoft.com/default.aspx?scid=kb;en-us;318804

"
Except for the WH_KEYBOARD_LL low-level hook and the WH_MOUSE_LL low-level
hook, you cannot implement global hooks in the Microsoft .NET Framework. To
install a global hook, a hook must have a native DLL export to inject
itself in another process that requires a valid, consistent function to
call into. This behavior requires a DLL export. The .NET Framework does not
support DLL exports. Managed code has no concept of a consistent value for
a function pointer because these function pointers are proxies that are
built dynamically.
"

We can only perform the WH_KEYBOARD_LL and WH_MOUSE_LL low-level hook in
the C# Windows application, the WH_GETMESSAGE hook type is not supported in
the .NET Framework.
So, I think we cannot globally hook the unicode characters in a C# Windows
application. Instead, we can create a separate DLL module, and perform the
WH_GETMESSAGE hook to trap the WM_IME_COMPOSITION message. Once the
WM_IME_COMPOSITION message is trapped, we can call the
ImmGetCompositionString API to retrieve the unicode characters.

For more information about the global hooks and WM_IME_COMPOSITION message,
you can refer to:

Hooks and DLLs
http://www.codeproject.com/KB/DLL/hooks.aspx

WM_IME_COMPOSITION
http://msdn.microsoft.com/en-us/library/ms776172.aspx

ImmGetCompositionString function
http://msdn.microsoft.com/en-us/library/ms776186.aspx

Sincerely,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team

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