tcpserver.c

一个用C语言编写的TCP服务器的源代码111

/**********************************************************************
*
*    案例四、TCP服务器(TcpServer.c)
*      描述：接收结构体消息
*  
***********************************************************************/
//#pragma pack(1)
#include <assert.h>
#include <stdio.h>
#include <winsock.h>

#pragma comment(lib, "WSOCK32.LIB")
#define PORT 5001

typedef struct TalkMsg
{
	unsigned char msgId;         //消息号
	unsigned int  seq;           //序列号
    unsigned int  msglen;        //消息长度,最大为1k
	char          content[1024];    //消息内容
}TalkMsg;

void main()
{
	SOCKADDR_IN local_sin;  
	SOCKADDR_IN client_sin;  
	int client_sin_len;
	TalkMsg msg;

	WSADATA WSAData;
	SOCKET ls;
	SOCKET cs;

	//该函数在Winsocket中必须调用
   	if (WSAStartup(MAKEWORD(1,1), &WSAData) != 0) 
 	{
		printf("Call WSAStartup()失败!\n");
		return;
	}
   
	ls = socket( AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if( ls == INVALID_SOCKET) 
 	{
		printf("创建套接字失败!\n");
		return;
	}

	memset((char *)&local_sin, 0, sizeof(local_sin));  /* 服务器地址清0 */
	
	local_sin.sin_family = PF_INET;
	local_sin.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	local_sin.sin_port = htons(PORT);

	if (bind(ls, (struct sockaddr FAR *) &local_sin, sizeof(local_sin)) == SOCKET_ERROR) 
	{
		printf("绑定套接字失败!\n");
		return;
	}

	if(listen(ls, 1000) == SOCKET_ERROR) 
	{
		printf("Call listen() 失败!\n");
		return;
	}

	client_sin_len = sizeof(client_sin);
	cs = accept(ls, (struct sockaddr FAR *)&client_sin, (int FAR *)&client_sin_len );
	
	memset(&msg, 0, sizeof(msg));
	recv(cs, &msg, sizeof(msg), 0);
	printf("msgId:%d\n", msg.msgId);
	printf("seq:%d\n", msg.seq);
	printf("msglen:%d\n", msg.msglen);
	printf("content:%s\n", msg.content);

	return;
}