在將C結構轉換爲C＃結構時訪問非託管C/C++ dll函數

Question

如何將一個C結構轉換爲C＃結構，以使用interopservices將其作爲參數發送給非託管dll函數。

Ç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; 
    }