hello!
I need a help for this:
i need to call a c++ dll that allocates and returns an int array something like this
struct vett_int {int vettore_interi[10];
}; static struct vett_int new_vett_int; extern "C" __declspec (dllexport) vett_int __stdcall intvect(int scelta)
{
{
switch (scelta) {
case 1 : return new_vett_int;
}
return new_vett_int;
}
}
i am calling intvect from a c# application like this
[DllImport("dataex.dll")] public static extern vettore_di_interi intvect(int choice); public struct vettore_di_interi { public int[] vettore_di_int; }main
prova_chiamata_a_dll.Program.vettore_di_interi vettore_interi_instance = new Program.vettore_di_interi(); vettore_di_interi = Program.intvect(1);at runtime i get the error ::
"Method's type signature is not PInvoke compatible."The same does not happen when i call another dll returning a simple two field structure like this
other c++ dll
struct retta_per_due_punti {
double Y;
short valido;
};
extern "C" __declspec (dllexport) retta_per_due_punti __stdcall rettadueP(double X_mis, double X2, double X1, double Y2, double Y1)
{ ... }
c# code like this
[DllImport("fumat.dll")] public static extern retta_due_P rettadueP( double misura, double X2, double X1, double Y2,double Y1); public struct retta_due_P { public double liv; public short valido; }main
prova_chiamata_a_dll.Program.retta_due_P retta_due_p_instance = new Program.retta_due_P(); retta_due_p_instance = rettadueP(10, 15, 5, 0, 20);this works correctly
call a c++ dll func returning a int array from a c# code
Suganya Mahadevan
In C# code, try the following:
public struct vettore_di_interi
{
[MarshalAs(UnmanagedType.LPArray)]
public int[] vettore_di_int;
}
I have not tried, but you can use the MarshalAs attribute to pass arrays as parameters, why why not with structs.
seu
Thank you for your help
The reality is that I already try what you suggest but I got the same behaviour.
Let me know if you have other ideas.
Best regards
rodrigo