学步园

//////SRV
#include <Winsock2.h>
#include <stdio.h>

void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD(2, 2);

err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
return;
}

if (LOBYTE(wsaData.wVersion) != 2 ||
HIBYTE(wsaData.wVersion) != 2) {
WSACleanup();
return;
}
//// SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);
SOCKET sockSrv = socket(AF_INET, SOCK_DGRAM, 0);//UDP和TCP的不一样的地方

SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(6603);

bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));

/// listen(sockSrv, 5);//UDP不需要；

char recvBuf[100] = { 0 };
char sendBuf[100] = { 0 };
char tempBuf[200] = { 0 };//多定义两个

SOCKADDR_IN addrClient;
int len = sizeof(SOCKADDR);///这两个和UDP一样

///UDP不需要监听和建立连接
//while (1)
//{
// SOCKET sockConn = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
// char sendBuf[100] = { 0 };
// sprintf_s(sendBuf, 100, "Welcome %s to http://www.sunxin.org", inet_ntoa(addrClient.sin_addr));
// send(sockConn, sendBuf, strlen(sendBuf) + 1, 0);

// recv(sockConn, recvBuf, 100, 0);

// recvfrom(sockSrv, recvBuf, 100, 0, (SOCKADDR*)&addrClient, &len);///UDP用recvfrom而不是recv
////net用while(1)死循环这点和UDP 不一样的
while(1)
{
recvfrom(sockSrv, recvBuf, 100, 0, (SOCKADDR*)&addrClient, &len);///UDP用recvfrom而不是recv
if('q' == recvBuf[0])
{
sendto(sockSrv, "q", strlen("q") + 1, 0, (SOCKADDR*)&addrClient, len);
printf("ta xiang tuichu! chat end\n");
break;
}
sprintf_s(tempBuf,"%s say :%s",inet_ntoa(addrClient.sin_addr),recvBuf);
printf("%s\n",tempBuf);

////以下是受到信息后 对其回复的处理！！
printf("qing shuru shuju\n");
gets_s(sendBuf);
sendto(sockSrv, sendBuf, strlen(sendBuf) + 1, 0, (SOCKADDR*)&addrClient, len);
}
// printf("%s\n", recvBuf);

/// closesocket(sockConn);
closesocket(sockSrv);
WSACleanup();

//}

}

///CLIENT

#include <Winsock2.h>//加裁头文件
#include <stdio.h>//加载标准输入输出头文件
void main()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;

wVersionRequested = MAKEWORD(2, 2);

err = WSAStartup(wVersionRequested, &wsaData);
if (err != 0) {
/* Tell the user that we could not find a usable */
/* WinSock DLL.                                  */
return;
}
if (LOBYTE(wsaData.wVersion) != 2 ||
HIBYTE(wsaData.wVersion) != 2) {
/* Tell the user that we could not find a usable */
/* WinSock DLL.                                  */
WSACleanup();
return;
}

/// SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);
SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, 0);///UDP是这样设置的  0代表选择合适的协议

SOCKADDR_IN addrSrv;
addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(6603);
///以上是和TCP一样的！
/// connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));

/*char recvBuf[100] = { 0 };
int len = sizeof(SOCKADDR);*///UDP不需要

///// recv(sockClient, recvBuf, 100, 0);
//// recvfrom(sockClient, recvBuf, 100, 0, (SOCKADDR*)&addrSrv, &len);///UDP用recvfrom而不是recv
//
//// printf("%s\n", recvBuf);
///以上UDP不需要
/// send(sockClient, "This is zhangsan12 ", strlen("This is zhangsan ") + 1, 0);

///下面是UDP和net不同的地方
char recvBuf[100] = { 0 };
char sendBuf[100] = { 0 };
char tempBuf[200] = { 0 };//多定义三个
int len = sizeof(SOCKADDR);//net需要

///聊天时  加上一个while(1)循环
while(1)
{
printf("please input data:\n");
gets_s(sendBuf);
sendto(sockClient, sendBuf, strlen(sendBuf) + 1, 0, (SOCKADDR*)&addrSrv,len);
recvfrom(sockClient, recvBuf, 100, 0, (SOCKADDR*)&addrSrv, &len);
if ('q' == recvBuf[0])
{
sendto(sockClient, "q", strlen("q") + 1, 0, (SOCKADDR*)&addrSrv, len);
printf("char end\n");
break;
}
sprintf_s(tempBuf,"%s say:%s",inet_ntoa(addrSrv.sin_addr),recvBuf);
printf("%s\n",tempBuf);

}
// sendto(sockClient, "This is zhangsan123 ", strlen("This is zhangsan12345 ") + 1, 0, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));
closesocket(sockClient);
WSACleanup();
}