Arguments to DLL functions

[Zcumbag]

Hi!

I'm having some problem with a function in a DLL that I'm writing.
I need to recieve a System.Drawing.Graphics object as an argument to this function...

but visual studio keeps saying "Type 'System.Drawing.Graphics' is not defined"

It doesn't work to import System.Drawing either

This is the code I have

Public Shared Function drawCircle(ByVal x1%, ByVal gr As System.Drawing.Graphics) As System.Drawing.Graphics
        'Implementation
End Function

Why doesn't it work?

[hellswraith]

ByVal x1%

What does that mean?

[grahamambrose]

ByVal x1%

% is equivilant to typing 'as interger'
so you end up with a interger called x1

ByVal means that x1's value is passed to the function instead of a reference to x1

[Cander]

I dont think % works like that in .NET.

[Frans C]

To start with:
You need a reference to system.drawing.dll

But if I am correct, you cannot create a system.drawing.graphics object (or pass it byval). The graphics object can not be seperated from the device context that provided it. If lets say a picturebox provides a graphics object, you cannot use it seperate from the picturebox. Without the device context, the graphics object is useless. Are you sure you need it byval? Byref should be no problem.