Array Marshaling

C++

HRESULT New1(int ar[10]);  
HRESULT New2(double ar[10][20]);  
HRESULT New3(LPWStr ar[10]);

C#

void New1([MarshalAs(UnmanagedType.LPArray, SizeConst=10)] int[] ar);  
void New2([MarshalAs(UnmanagedType.LPArray, SizeConst=200)] double[] ar);  
void New2([MarshalAs(UnmanagedType.LPArray,
    ArraySubType=UnmanagedType.LPWStr, SizeConst=10)] String[] ar);

C++

HRESULT New1(int ar[]);  
HRESULT New2(int ArSize, [size_is(ArSize)] double ar[]);  
HRESULT New3(int ElemCnt, [length_is(ElemCnt)] LPStr ar[]);

C#

void New1(ref int ar);
void New2(ref double ar);
void New3(ref String ar);

배열의 요소 수를 지정하는 방법

1. 배열의 요소 수가 포함된 또 다른 매개 변수 식별, 매개 변수는 위치로 식별

void New(  
    int ElemCnt,
    [MarshalAs(UnmanagedType.LPArray, SizeParamIndex=0)] int[] ar);

2. 배열의 크기를 상수로 정의

void New(  
    [MarshalAs(UnmanagedType.LPArray, SizeConst=128)] int[] ar);

 

구조체 내의 배열

C++

struct MyStruct {
    int values[128];
};

C#

[StructLayout(LayoutKind.Sequential)]
public struct MyStruct
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConstant = 128)] public int[] values;
}

 

 

 

struct Image {
    unsigned char* image_ptr;
    int rows;
    int cols;
};
 
typedef void (*pfnCallback)(bool[], const char* [], Image[], Image, int length);

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct Image
{
    public IntPtr image_ptr;
    public int rows;
    public int cols;
}
 
public delegate void dgCallback(
    [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.I1, SizeParamIndex = 4)] bool[] status,
    [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr, SizeParamIndex = 4)] string[] id,
    [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 4)] Image[] img_face,
    Image img_org,
    int length);