[?] ERROR_HOOK_NEEDS_HMOD during installing system hook

[Gambero]

Hi, i want to do system hook WH_SYSMSGFILTER,
my code is:

IntPtr hMod =
Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly ().GetModules()[0]);
//install hook
hSysMsgHook = Api.User32.SetWindowsHookEx(WH_SYSMSGFILTER,
SysMsgHookProcedure, hMod, 0);
//If SetWindowsHookex fails.
if (hSysMsgHook == 0)
{
int errorCode = Marshal.GetLastWin32Error();
//do cleanup
Stop(false, false, true, false);
//Initializes and throws a new instance of the Win32Exception class with
the specified error.
throw new Win32Exception(errorCode);
}
hMod is valid but the api return code is ERROR_HOOK_NEEDS_HMOD!
other types of hook like WH_KEYBOARD_LL or WH_MOUSE_LL works fine!
my machine is windows vista
what's wrong?
Thanks

[Mattias Sjögren]

>Hi, i want to do system hook WH_SYSMSGFILTER,

You can't implement global system hooks in managed code (with the
exception of the _LL types). Choose another language that compiles to
native code and that doesn't require any runtime library to run.
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[=?Utf-8?B?aXdkdTE1?=]

the bottom of this article

http://support.microsoft.com/default.aspx/kb/318804

explains that .net applications cannot implement global system hooks
hope this helps

--iwdu15