[RESOLVED] dll returns C structure with dynamic arrays, how to get data in c# ???

Hello

I have a DLL written in C and I am struggling with using the functions that return a structure in C#.

C Code that compiles into dll

Code:

---


typedef struct
{
        unsigned int Height;        //!< Height of the image in pixels.
        unsigned int Width;        //!< Width of the image in pixels.
        unsgined short ***Pixels;         
} IMAGE;

//! Creates and initializes image structure and returns pointer to new image
__declspec(dllexport) IMAGE        CreateImage(unsigned int aHeight, unsigned int aWidth);

---

I need to use this function in C#, this is what i tried:

Code:

---


public struct IMAGE
{
        int Height;
        int Width;
        short[,,] Pixels;
}

[DLLImport("IMAGE.dll")]
public static extern IMAGE CreateImage(int aHeight, int aWidth);

---

But when I call

Code:

---

IMAGE image = new IMAGE();
image = CreateImage(100,100);

---

I get the error: Method's type signature is not PInvoke compatible

Other functions that return plain integers work just fine. Someone please explain how I can use a structure created by DLL.

Thanks

Solved it .....

Code:

---


public struct IMAGE
{
      public Int32 Height;
      public Int32 Width;
      public IntPtr Pixels;
}

[DllImport("Image.dll")]
public static extern IMAGE CreateImage(Uint32 Height, Uint32 Width);

---

after calling the CreateImage function I can use Marshal.ReadIntPrt(Pixels) and Marshal.ReadInt16(IntPtr) to get the data :).