什么是C＃相当于这些C ++结构的 [英] What are the C# equivalent of these C++ structs

问题描述

typedef union _Value {
    signed char    c; 
    unsigned char  b; 
    signed short   s; 
    unsigned short w; 
    signed long    l; 
    unsigned long  u; 
    float          f; 
    double        *d; 
    char          *p; 
} Value;


typedef struct _Field {
 WORD    nFieldId;
 BYTE    bValueType;
 Value Value;
} Field;


typedef struct _Packet {
 WORD    nMessageType;
 WORD    nSecurityType;
 BYTE    bExchangeId;
 BYTE    bMarketCenter;
 int     iFieldCount;
 char    cSymbol[20];
    Field FieldArr[1];

} Packet;

什么是C＃相当于这些C ++结构的？

What are the C# equivalent of these C++ structs?

我从迁移C ++一些代码，C＃，不得不迁移这些结构问题。我曾尝试了一些东西，但我总是最后不得不编组的问题。

I am migrating some code from C++ to C# and having problems to migrate these structures. I had tried a few things but I always ended up having marshalling problems.

推荐答案

我假设的'炭'被用作一个8位数字，如果是的话，那么这里有你重新映射：

I'm assuming the 'char' is being used as an 8 bit number, if so, then here are you're mappings:

signed char    c; -> SByte    c; 
unsigned char  b; -> Byte     b;
signed short   s; -> Int16    s;
unsigned short w; -> UInt16   w;
signed long    l; -> Int32    l;
unsigned long  u; -> UInt32   u;
float          f; -> Single   f; (though 'float' still works)
double        *d; -> Double   d; (was this meant to be a pointer???)
char          *p; -> String   s; (assuming its a string here, in the marshaling you can tell it whether it is ASCII or wide char format)

通过这个信息应该是比较容易翻译那些strucutres（只要确保你让他们为结构，并给它属性[System.Runtime.InteropServices.StructLayout（System.Runtime.InteropServices.LayoutKind.Sequential） ，这将确保编组保持在同一顺序的所有数据。

With this info it should be relatively easy to translate those strucutres (just make sure you keep them as a struct and give it the attribute "[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]", which will make sure that the marshaller keeps all the data in the same order.

另外，我建议翻翻两个类和属性System.Runtime.InteropServices为他们提供自动化数据，C / C ++代码（它不要求不安全的C＃代码其一）的封送处理相当多的方法。

Also, I recommend looking through both the classes and attributes in System.Runtime.InteropServices as they do provide quite a few methods for automating marshaling of data to c/c++ code (and it doesn't require "unsafe" c# code either).

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