服务端程序
#include <Winsock2.h>
#include <stdio.h>void main()
{
//加载1.1版本的套接字库
WORD wVersionRequested;
WSADATA wsaData;
int err; wVersionRequested = MAKEWORD( 1, 1 ); err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
} //创建套接字
SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);
//绑定
SOCKADDR_IN addrSrc;
addrSrc.sin_family=AF_INET;
addrSrc.sin_port=htons(7000);
addrSrc.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
bind(sockSrv,(SOCKADDR*)&addrSrc,sizeof(SOCKADDR)); //将套接字设置为监听模式
listen(sockSrv,5);
SOCKADDR_IN addrClient;//接受客户端地址信息
int len=sizeof(SOCKADDR);
while(1)//等待客户的连接请求
{
SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len);
char sendBuf[100];
sprintf(sendBuf,"Welcome %s to http://www.sunxin.org",inet_ntoa(addrClient.sin_addr));
send(sockConn,sendBuf,strlen(sendBuf)+1,0);//向客户端发送数据 char recvBuf[100];
recv(sockConn,recvBuf,100,0);//客户端接收数据
printf("%s\n",recvBuf); closesocket(sockConn);
}
}
#include <Winsock2.h>
#include <stdio.h>
void main()
{
//加载1.1版本的套接字库
WORD wVersionRequested;
WSADATA wsaData;
int err; wVersionRequested = MAKEWORD( 1, 1 ); err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
} SOCKET sockClient=socket(AF_INET,SOCK_STREAM,0); 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(7000);
connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR)); char recvBuf[100];
recv(sockClient,recvBuf,100,0);
printf("%s\n",recvBuf);
send(sockClient,"This is zhangsan",strlen("This is zhangsan")+1,0); closesocket(sockClient);
WSACleanup();
}
#include <Winsock2.h>
#include <stdio.h>void main()
{
//加载1.1版本的套接字库
WORD wVersionRequested;
WSADATA wsaData;
int err; wVersionRequested = MAKEWORD( 1, 1 ); err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
} //创建套接字
SOCKET sockSrv=socket(AF_INET,SOCK_STREAM,0);
//绑定
SOCKADDR_IN addrSrc;
addrSrc.sin_family=AF_INET;
addrSrc.sin_port=htons(7000);
addrSrc.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
bind(sockSrv,(SOCKADDR*)&addrSrc,sizeof(SOCKADDR)); //将套接字设置为监听模式
listen(sockSrv,5);
SOCKADDR_IN addrClient;//接受客户端地址信息
int len=sizeof(SOCKADDR);
while(1)//等待客户的连接请求
{
SOCKET sockConn=accept(sockSrv,(SOCKADDR*)&addrClient,&len);
char sendBuf[100];
sprintf(sendBuf,"Welcome %s to http://www.sunxin.org",inet_ntoa(addrClient.sin_addr));
send(sockConn,sendBuf,strlen(sendBuf)+1,0);//向客户端发送数据 char recvBuf[100];
recv(sockConn,recvBuf,100,0);//客户端接收数据
printf("%s\n",recvBuf); closesocket(sockConn);
}
}
#include <Winsock2.h>
#include <stdio.h>
void main()
{
//加载1.1版本的套接字库
WORD wVersionRequested;
WSADATA wsaData;
int err; wVersionRequested = MAKEWORD( 1, 1 ); err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
} SOCKET sockClient=socket(AF_INET,SOCK_STREAM,0); 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(7000);
connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR)); char recvBuf[100];
recv(sockClient,recvBuf,100,0);
printf("%s\n",recvBuf);
send(sockClient,"This is zhangsan",strlen("This is zhangsan")+1,0); closesocket(sockClient);
WSACleanup();
}
和sendBuf初始化为0 ,我试过,之后运行结果就是什么也不现实!!!
网上说把recvBuf,和sendBuf初始化为0 ,我试过,之后运行结果就是什么也不显示!!!
大多数都是buffer没有zeromemory,或者访问越界导致的
int i,j,k;
char binstr[80]; for (i=0;i<len;i++) {
if (0==(i%16)) {
sprintf(binstr,"%08x -",i+addr);
sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
} else if (15==(i%16)) {
sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
sprintf(binstr,"%s ",binstr);
for (j=i-15;j<=i;j++) {
sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
}
printf("%s\n",binstr);
} else {
sprintf(binstr,"%s %02x",binstr,(unsigned char)buf[i]);
}
}
if (0!=(i%16)) {
k=16-(i%16);
for (j=0;j<k;j++) {
sprintf(binstr,"%s ",binstr);
}
sprintf(binstr,"%s ",binstr);
k=16-k;
for (j=i-k;j<i;j++) {
sprintf(binstr,"%s%c",binstr,('!'<buf[j]&&buf[j]<='~')?buf[j]:'.');
}
printf("%s\n",binstr);
}
}
我给改了一下你看看有没有用#include "stdafx.h"
#include <Winsock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32")
void main()
{
//加载1.1版本的套接字库
WORD wVersionRequested;
WSADATA wsaData;
int err; wVersionRequested = MAKEWORD( 1, 1 ); err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return;
}
if ( LOBYTE( wsaData.wVersion ) != 1 ||HIBYTE( wsaData.wVersion ) != 1 )
{
WSACleanup( );
return;
} SOCKET sockClient=socket(AF_INET,SOCK_STREAM,0); 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(7000);
if(SOCKET_ERROR==connect(sockClient,(SOCKADDR*)&addrSrv,sizeof(SOCKADDR)))
{
printf("%s%d\n","无法连接服务器:",::WSAGetLastError());
closesocket(sockClient);
WSACleanup();
system("pause");
return;
}
char recvBuf[100];
if(SOCKET_ERROR ==recv(sockClient,recvBuf,100,0))
{
printf("%s%d\n","接收失败:",::WSAGetLastError());
closesocket(sockClient);
WSACleanup();
system("pause");
return;
}
printf("%s\n",recvBuf);
if(SOCKET_ERROR ==send(sockClient,"This is zhangsan",strlen("This is zhangsan")+1,0))
{
printf("%s%d\n","发送失败:",::WSAGetLastError());
}
closesocket(sockClient);
WSACleanup();
system("pause");
}
printf("%s\n",recvBuf);
send(人多)send(病少)send(财富)
recv(人多病)recv(少财富)
陷阱里面啊!
http://bbs.csdn.net/topics/380167545
recv(sockClient,recvBuf, _countof(recvBuf) - 1,0);类似的地方都修改一下,同时判断recv的返回值,看看接受的数据完整了没?如果没有收完,就循环接收。
* 0xABABABAB : Used by Microsoft's HeapAlloc() to "no man's land" guard bytes after allocated heap memory
漱 * 0xABADCAFE : A startup to this value to initialize all free memory to catch errant pointers
涵? * 0xBAADF00D : Used by Microsoft's LocalAlloc(LMEM_FIXED) to uninitialised allocated heap memory
很? * 0xBADCAB1E : Error Code returned to the Microsoft eVC debugger when connection is severed to the debugger
撅饰 * 0xBEEFCACE : Used by Microsoft .NET as a magic number in resource files
烫烫 * 0xCCCCCCCC : Used by Microsoft's C++ debugging runtime library to uninitialised stack memory
屯屯 * 0xCDCDCDCD : Used by Microsoft's C++ debugging runtime library to uninitialised heap memory
葺葺 * 0xDDDDDDDD : Used by Microsoft's free() or delete to freed heap memory
蕲蕲 * 0xDEADDEAD : A Microsoft Windows STOP Error code used when the user manually initiates the crash
* 0xFDFDFDFD : Used by Microsoft's C++ debugging heap to "no man's land" guard bytes before and after allocated heap memory
* 0xFEEEFEEE : Used by Microsoft's HeapFree() to freed heap memory
recv(sockConn,recvBuf,100,0);/没有返回数据,是超时返回的
数组要初始化为空
还有,当中文字符(双字节)和英文(单字节)的字符混在一起的时候,更容易出现这类错误。解决办法是使用UNICODE字符集,汉字英文通通以双字节存储。不过,同样会出现空字符的上述两种情况,根据情况解决就是了。
int nRecvLen = recv(sockConn,recvBuf,100,0);//客户端接收数据
if(nRecvLen>0)
{
recvBuf[nRecvLen] = '\0';
printf("%s\n",recvBuf);
}