在訪問非托管C / C ++ dll函數時將C結構轉換為C＃結構時遇到問題

Question

我如何使用interopservices將C結構轉換為C ＃結構以將其作為參數發送給非托管dll函數。

C結構

typedef struct {
   unsigned int opt,
   NDVAL val,
   byte type
} NDGETVAL; 

typedef union    
{    
int i,    
bool b,    
float f,    
char *t,    
} NDVAL

Answer 1

  Converted c stracture to c#


      [StructLayout( LayoutKind.Explicit )]
       struct NDVAL
     {
       [FieldOffset( 0 )]
       int i;
       [FieldOffset( 0 )]
       bool b;
       [FieldOffset( 0 )]
       float f;
       [FieldOffset( 0 )]
       IntPtr t;
    }

    class NDGETVAL
    {
      uint opt;
      NDVAL val;
     byte type;
    }