using PInvoke with an array of struct

[puchie]

Hi!

I want to call a function from a c++ unmanaged dll but i'm having a hard time in doing it because of an array parameter.

the definition in c++ of the method is:

int __export __stdcallInsertStruct(int countS,  AInfo info[11])

and

typedef struct
{
char* a;
char b;
char* c;
}AInfo;

In my c# code i have:

[StructLayout(LayoutKind.Sequential)]
        public struct AInfo
        {
            public string a;
            public char b;
            public string c;
        }
 

and

private delegate IntPtr InsertStructDelegate(int countS,  AInfo[] info);

I fill the array before calling this delegate and i
can't manage to get this to work. Always get an error of broken memory.

do i have to use another type instead of AInfo[] in my method definition?
Like IntPtr or byte[]?

Can someone help me with this one?

[Plater]

I don't know specifically, but check the Marshal class for some usefull things.
I think you may have to marshal your object as a special C array. Don't remember how, but I know saw something like that somewhere

[puchie]

I think the problem here is to Marshal the string fields. Does anyone hava an idea on how to do this. I Tried a lot of different approaches without success.

Thanks

[Plater]

Same deal, somewhere there's a property or something under the marshalling that says "make this a c-style array of char" or lpcstr or something