将c ++代码转换为c#

时间:2013-03-28 06:40:19

标签: c# c++ interop com-interop

这是来自c ++的代码片段

struct 
    {
        short       m_nVersion;
        short       m_nMOT_Addr;
        q_address   m_oDistribution_Q;
        short       m_nOffset;
        char        m_cOperator;
        short       m_cLength;
        long        m_lOperand;
        char        m_cReq_Ack;
        char        m_cReq_SeqGap;
        char        m_cReq_AutoDereg;
    } oSbsReg;

    const short nMsgSize = 20;  //20 byte long structure when packed

    char sMessageBuffer[nMsgSize]; // I created stringbuilder in c#

    memset(&oSbsReg,0,sizeof(oSbsReg));
    memset(sMessageBuffer,0,sizeof(sMessageBuffer));

    oSbsReg.m_nVersion = 20;                        //Version
    oSbsReg.m_nMOT_Addr = (short) lMot;             //MOT in which to register with
    oSbsReg.m_oDistribution_Q.au.queue = m_oQueue.au.queue; //Current queue number
    oSbsReg.m_oDistribution_Q.au.group = m_oQueue.au.group; //Current group 
    //changed to 0 to resolve Oswego issue when moved to DMQ 5.0
    oSbsReg.m_nOffset = 0;                          //Start byte for telegram match
    oSbsReg.m_cOperator = PSEL_OPER_EQ;             //Exact match
    oSbsReg.m_cLength = 4;                          //Number of bytes in match
    oSbsReg.m_lOperand = lTelegramId;               //Telegram Id to match against
    oSbsReg.m_cReq_Ack = 1;                         //TRUE: Request an acknowledge of registration
    oSbsReg.m_cReq_SeqGap = 1;                      //TRUE: Request an acknowledge of a sequence gap
    oSbsReg.m_cReq_AutoDereg = 1;                   //TRUE: Request an auto deregistration on a connection loss

    //default compile option is 8 byte packing, didn't want to change it
    //manually pack bytes in structure to satisfy the SBS server's expectations
    memcpy(sMessageBuffer, &oSbsReg, 11);
    memcpy(sMessageBuffer+11, &(oSbsReg.m_cLength), 2);
    memcpy(sMessageBuffer+13, &(oSbsReg.m_lOperand), 7); //twenty bytes max!

我需要在c#,

中转换上面的代码

我在c#中创建了上面的结构并进行了初始化但是现在我想把它放在stringbuilder变量中,同样在结构放入char数组中。但是你可以看到他们使用memset和mem cpy函数。

我怎样才能在c#中实现同样的目标?

如何将上述结构放在stringbuilder变量c#中,如何从结构中提取字节并将其放入字符串生成器变量中?

1 个答案:

答案 0 :(得分:1)

我不建议使用char来存储C#中的字节(C#中的char实际上是两个字节,因为它是unicode)。
在.NET中有这种数据的数据类型,它被称为byte,它更类似于C ++的char,因为它还包含一个字节。

如果用结构类型的名称替换T,可以将对象转换为像这样的字节数组(顺便提一下,你可以用它来制作一个非常有用的泛型方法):

int size = Marshal.SizeOf(typeof(T));
byte[] rawData = new byte[size];

IntPtr ptr = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(obj, ptr, true);
Marshal.Copy(ptr, rawData, 0, size);
Marshal.FreeHGlobal(ptr);