c语言实现TCP的socket通信

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>  
#include "NC_ComLib.h"

SOCKET m_sock;

int NetTimeout =8000 ;//网络超时时间


void Com_Hook_DebugOutHex( unsigned char *data, unsigned int datalen )
{
    unsigned int i=0;
    for(i =0; i < datalen; i++)
    {
        printf("%02x",data[i]);
    }
    printf("rn");
}

void Com_Hook_DebugOutAscii( unsigned char *data, unsigned int datalen )
{
    printf("%sn",data);
}

int Connect( const char* address,int port)  
{  
    int rlt = 0;  
	  
    int iErrMsg;  
    //初始化WinSock  
    WSADATA wsaData;  
    iErrMsg = WSAStartup(MAKEWORD(2,2),&wsaData);  
    if (iErrMsg != 0)  
    {  
        printf("failed with wsaStartup error : %dn",iErrMsg);  
  
        rlt = 1;  
        return rlt; 
    }  
    m_sock = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);  
    if (m_sock == INVALID_SOCKET)  
    {  
        printf("socket failed with error : %dn",WSAGetLastError());  
  
        rlt = 2;  
        return rlt;  
    }  
  
    //地址配置
    SOCKADDR_IN sockaddrServer;  
    sockaddrServer.sin_family = AF_INET;  
    sockaddrServer.sin_port = htons(port);  
    sockaddrServer.sin_addr.s_addr = inet_addr(address);  
  
    setsockopt(m_sock,SOL_SOCKET,SO_RCVTIMEO,(char*)&NetTimeout,sizeof(int));
    //建立连接 
    iErrMsg = connect(m_sock,(SOCKADDR*)&sockaddrServer,sizeof(sockaddrServer)); 
    if (iErrMsg < 0)  
    {  
        printf("connect failed with error : %dn",iErrMsg);  
  
        rlt = 3;  
        return rlt;  
    }  
	return rlt;  
}

int SendMsg(const char* msg,int len)  
{  
    int rlt = 0;  
  
    int iErrMsg = 0;  
  
    iErrMsg = send(m_sock,msg,len,0);  
    if (iErrMsg < 0)  
    {  
        printf("send msg failed with error : %dn",iErrMsg);  
        rlt = 1;  
        return rlt;  
    }  
  
    return rlt;  
}  
unsigned int Com_Dev_Connect( const char* address,int port, unsigned int timeout,unsigned int channel )
{
    return Connect(address,port);
}
unsigned int Com_Dev_TxData( unsigned char *buf, unsigned int len, unsigned int timeout, unsigned int channel )
{
    unsigned int rlt = 0;  
  
    int iErrMsg = 0;  
  
    iErrMsg = send(m_sock,(char*)buf,len,0);  
    if (iErrMsg < 0)  
    {  
        printf("send msg failed with error : %dn",iErrMsg);  
        rlt = 1;  
        return rlt;  
    } 
    printf("->send:rn");
    Com_Hook_DebugOutAscii(buf,len);
    return rlt;  
}

unsigned int Com_Dev_RxData( unsigned char *buf, unsigned int *len, unsigned int bufsize, unsigned int timeout, unsigned int channel )
{
    unsigned int rcode = 0;
    int rval = 0; 
    unsigned char recvbuf[bufsize];
    rval = recv(m_sock,(char*)recvbuf,bufsize,0); 
    if(rval == SOCKET_ERROR)  
    {
        printf("recv socket error!rn"); 
        rcode = rval;
    }  
    else if (rval == 0)
    {
        //recv·µ»Ø0±íʾÕý³£Í˳ö  
        printf("ending connection!rn"); 
        rcode =200;
    }
    else 
    {
        //ÏÔʾ½ÓÊÕµ½µÄÊý¾Ý  
        printf("<-recv:rn");
        *len =  rval;
        memcpy(buf,recvbuf,*len);
        Com_Hook_DebugOutAscii(buf,*len);
        rcode =0;
    }
    return rcode;
}

unsigned int Com_Dev_Disconnect( unsigned int channel )
{
    closesocket(m_sock); 
    return 0; 
}