DllImport in C# 2005

[JumpyNET]

I'm trying to declare the mouse_event API in C# 2005 Express. What's wrong?

 

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern void mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo);

 

And I get the following error:

 

Error 1 The type or namespace name 'DllImport' could not be found (are you missing a using directive or an assembly reference?)

Edited June 3, 2005 by JumpyNET

[PlausiblyDamp]

You are missing a using directive.

add

using System.Runtime.InteropServices;

to the top of the file

[JumpyNET]

Thank you :)

[Wraith]

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern void mouse_event(long dwFlags, long dx, long dy, long cButtons, long dwExtraInfo);

 

Your types are the wrong size. the definition of mouse_event from the documentation is:

VOID mouse_event(
   DWORD dwFlags,
   DWORD dx,
   DWORD dy,
   DWORD dwData,
   ULONG_PTR dwExtraInfo
);

DWORD is an unsigned 32 bit integer, you're using long which is 64 bits and signed. The definitionof ULONG_PTR is debatable but i'd go with UIntPtr or IntPtr myself. I'd also say you can make the first type use a Flags marked enumeration of the values outlined in the documentation preventing lots of pointless casting internally once you've made the call.