Question

vc++6.0中socket怎样实现服务器向客户端传输文字？

#include<stdio.h>
#include<winsock.h>
#pragma comment (lib,"wsock32.lib")
void main()
{
WSADATA data;
WSAStartup(MAKEWORD(2,0),&data);
SOCKET socket1;
struct sockaddr_in local;
struct sockaddr_in from;
int fromlen =sizeof(from);
local.sin_family=AF_INET;
local.sin_port=htons(1000); ///监听端口
local.sin_addr.s_addr=INADDR_ANY; ///本机
socket1=socket(AF_INET,SOCK_DGRAM,0);
bind(socket1,(struct sockaddr*)&local,sizeof local);
while (1)
{
char buffer[1024]="\0";
printf("waiting for message from others-------------\n");
if (recvfrom(socket1,buffer,sizeof buffer,0,(struct sockaddr*)&from,&fromlen)!=SOCKET_ERROR)
{
printf("Received datagram from %s--%s\n",inet_ntoa(from.sin_addr),buffer);
////给cilent发信息
sendto(socket1,buffer,sizeof buffer,0,(struct sockaddr*)&from,fromlen);

}
}
closesocket(socket1);
WSACleanup();
}
这是服务器
#include<stdio.h>
#include<winsock.h>
#pragma comment (lib,"wsock32.lib")

void main()
{
WSADATA data;
WSAStartup(MAKEWORD(2,0),&data);
SOCKET socket1;
struct sockaddr_in server;
int len =sizeof(server);
server.sin_family=AF_INET;
server.sin_port=htons(1000); ///server的监听端口
server.sin_addr.s_addr=inet_addr("172.20.10.3"); ///server的地址

socket1=socket(AF_INET,SOCK_DGRAM,0);
while (1)
{
char buffer[1024]="\0";
printf("input message\n");
scanf("%s",buffer);
if (strcmp(buffer,"bye")==0)
break;
if (sendto(socket1,buffer,sizeof buffer,0,(struct sockaddr*)&server,len)!=SOCKET_ERROR)
{
if (recvfrom(socket1,
buffer,
sizeof buffer,
0,
(struct sockaddr*)&server,&len) != SOCKET_ERROR)
printf("rece from server:%s\n",buffer);
}
}
closesocket(socket1);
WSACleanup();
}这是客户端的。
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Answer 1

孙鑫《VC++深入详解》第14章有该代码的详细解说，可以看看，相信你看了就会明白的