C Socket

#include "stdafx.h"  
#include <stdio.h>  
#include <winsock2.h>  
#include <string.h>
#pragma comment(lib,"ws2_32.lib")  

extern char* substr(const char*str,unsigned start, unsigned end);
extern char * getFirst(char str[]);
extern char* getValue(char str[]);
extern void writeAfter(char buffer[]);
extern void del(char id[]);
extern char* searchByID(char id[]);


char revData[255];   
char sendData[255];

char* responseMsg(char strline[]){
    char res[255];
    char cmd[255];
    char values[255];
    strcpy(cmd,getFirst(strline));//cmd就是  add ....这样的命令
    strcpy(values,getValue(strline));
    printf("server get first is----%s",getFirst(strline));
    //当cmd就是add的时候 strcmp的结果是0  所以要加上！ 否则不能进入
    if(!strcmp(cmd,"add"))
    {
        writeAfter(values);
        strcpy(res,"server get add");//test
    }
    else if(!strcmp(cmd,"search"))
    {
        strcpy(res,searchByID(values));
    }
    else if(!strcmp(cmd,"del"))
    {
        del(values);
        strcpy(res,"server get del");
    }
    else
    {
        strcpy(res,"cmd is not right");
    }

    return res;
} 




int main(int argc, char* argv[])  
{  
    //初始化WSA  
    WORD sockVersion = MAKEWORD(2,2);  
    WSADATA wsaData;  
    if(WSAStartup(sockVersion, &wsaData)!=0)  
    {  
        return 0;  
    }  

    //创建套接字  
    SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);  
    if(slisten == INVALID_SOCKET)  
    {  
        printf("socket error !");  
        return 0;  
    }  

    //绑定IP和端口  
    sockaddr_in sin;  
    sin.sin_family = AF_INET;  
    sin.sin_port = htons(8081);  
    sin.sin_addr.S_un.S_addr = INADDR_ANY;   
    if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)  
    {  
        printf("bind error !");  
    }  

    //开始监听  
    if(listen(slisten, 5) == SOCKET_ERROR)  
    {  
        printf("listen error !");  
        return 0;  
    }  


    SOCKET sClient;  
    sockaddr_in remoteAddr;  
    int nAddrlen = sizeof(remoteAddr);  


    printf("等待连接...
");  
    sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);  
    if(sClient == INVALID_SOCKET)  
    {  
        printf("accept error !");  

    }  
    printf("接受到一个连接：%s 
", inet_ntoa(remoteAddr.sin_addr));  


    //发送数据  
    char *sendstr = "Hello Connected
";  
    strcpy(sendData,sendstr);
    send(sClient, sendData, strlen(sendData), 0);  

    int count=1;
    while(true)
    {
        printf("a loop starts count %d ======================
",++count );
        //接收数据  
        int ret = recv(sClient, revData, 255, 0);         
        if(ret > 0)  
        {  
            revData[ret] = 0x00;  
            printf("server get msg is------%s
",revData);  
        }  
        //处理revData============================

        //发送数据  
        strcpy(sendData,responseMsg(revData));
        strcat(sendData,"
");//注意java那边使用的是BufferedReader   也就是说要读到一个回车才算是读完一行  否则会一直卡住
        printf("Server response is-------%s",sendData);
        send(sClient, sendData, strlen(sendData), 0);  
        printf("a loop end count %d ======================
" ,count);    
    }

    closesocket(sClient);
    closesocket(slisten);  
    WSACleanup();  
    char sc=getc(stdin);
    return 0;  
}