Hello,
I'm writing a .NET program which is using a mouse hook but everytime the
filter function is invoked a argumentException is thrown.
Here is the part of code i'm using to convert the structure :

this.MouseData = (MouseHookStruct)Marshal.PtrToStructure(lParam,
typeof(MouseHookStruct));

And here my declaration of the structure :

//Declare the wrapper managed MouseHookStruct class.
[StructLayout(LayoutKind.Sequential)]
public class MouseHookStruct
{
public POINT pt;
public int hwnd;
public int wHitTestCode;
public int dwExtraInfo;
}

Am i doing something wrong, do I forgot something... ?

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How did you declare the POINT type? What about the callback method
signature?


Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com

Here is the POINT type declaration :

public class POINT
{
public int x;
public int y;
}

and the callback function signature :

// Filter function delegate
public delegate int HookProc(int code, IntPtr wParam, IntPtr lParam);

"aimoz@intechinfo.fr" <aimozintechinfofr@discussions.microsoft.com> wrote in
message news:9719EE2C-C0CD-4FB6-8B87-0E30F104837F@microsoft.com...
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Should definitely be a struct, not a class:
http://pinvoke.net/default.aspx/Structures.POINT

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That looks mostly ok:
http://pinvoke.net/default.aspx/user32/SetWindowsHookEx.html
http://www.pinvoke.net/default.aspx/Delegates/HookProc.html

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I've tried with your information, now it works.