c的socket編程實例
『壹』 在windows下，如何用純c語言實現socket網路編程
mfc只是對socket進行了一些封裝，大部分人做
網路編程
都是用的原始的socket，比如如下介面都可以在c下進行調用
1.socket()
2.bind()
3.connect()
4.listen()
5.accept()
6.send()
和recv()
7.sendto()
和recvfrom()
8.close()
和shutdown()
9.
getpeername
()
10.
gethostname
()
這些介面是在Winsock2.h中定義的不是在mfc中定義的，你只需要包含Winsock2.h
頭文件
和
Ws2
_32.lib庫就可以了。
『貳』 linux C語言編程,socket實現的即使通訊系統
Socket通信創建步驟：
（1）通過socket()函數創建socket
（2）通過bind函數綁定socket於設備地址
（3）進行讀寫操作read/recv/recvfrom write/send/sendto
（4）close方法關閉套接字
例子如下：
test1.c
#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<netinet/in.h>
#include<arpa/inet.h>
intmain(void)
{
//createsocket
intfd=socket(AF_INET,SOCK_DGRAM,0);
if(fd==-1)
{
perror("socket ");
exit(-1);
}
printf("socketfd=%d ",fd);
//buildconnectionaddress
structsockaddr_inaddr;
addr.sin_family=AF_INET;
addr.sin_port=htons(6666);
addr.sin_addr.s_addr=inet_addr("127.0.0.1");
intr;
r=bind(fd,(structsockaddr*)&addr,sizeof(addr));
if(r==-1)
{
perror("bind");
close(fd);
exit(-1);
}
printf("bindaddresssuccessful! ");
//acceptorsendmessage
charbuf[255];
structsockaddr_infrom;
socklen_tlen;
len=sizeof(from);
while(1)
{
r=recvfrom(fd,buf,sizeof(buf)-1,0,(structsockaddr*)&from,&len);
if(r>0)
{
buf[r]=0;
printf("Themessagefrom%sis:%s ",inet_ntoa(from.sin_addr),buf);
}
else
{
break;
}
}
//closesocket
close(fd);
return0;
}
test2.c
java">#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<string.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<arpa/inet.h>
intmain(void)
{
//createsocket
intfd=socket(AF_INET,SOCK_DGRAM,0);
if(fd==-1)
{
perror("socket");
exit(-1);
}
printf("createsocketOK! ");
//createansendaddress
structsockaddr_inaddr={};
addr.sin_family=AF_INET;
addr.sin_port=htons(6666);
addr.sin_addr.s_addr=inet_addr("127.0.0.1");
//
intr;
charbuf[255];
while(1)
{
r=read(0,buf,sizeof(buf)-1);
if(r<=0)
break;
sendto(fd,buf,r,0,(structsockaddr*)&addr,sizeof(addr));
}
//closesocket
close(fd);
return0;
}
先運行test1.c，然後運行test2.c，在test2.c運行後輸入內容，在test1.c所在終端中就會顯示信息
運行結果如下：
『叄』 windows 下 c語言，不是c++，c語言socket的簡單實例
伺服器：
#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 local;
struct sockaddr_in from;
int fromlen =sizeof(from);
local.sin_family=AF_INET;
local.sin_port=htons(1000); ///監聽埠
local.sin_addr.s_addr=INADDR_ANY; ///本機
socket1=socket(AF_INET,SOCK_DGRAM,0);
bind(socket1,(struct sockaddr*)&local,sizeof local);
while (1)
{
char buffer[1024]="\0";
printf("空信岩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);
////給坦培cilent發信斗御息
sendto(socket1,buffer,sizeof buffer,0,(struct sockaddr*)&from,fromlen);
}
}
closesocket(socket1);
WSACleanup();
}
客戶端：
#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的監聽埠
server.sin_addr.s_addr=inet_addr("???.???.???.???"); ///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();
}
『肆』 C語言socket編程
send用戶名和密碼,然後再伺服器判斷這段字元串的賬號密碼是否符合,然後客戶端recv,如果recv的字元串是登錄成功,才進行下面操作.否則就提示用戶名和密碼有誤.
『伍』 用Socket編程實現一個基於C/S的應用
例子一旅滾肢：
1 客戶端的程序
package net3;
import java.io.*;
import java.net.*;
public class Client {
public static void main(String[] args){
try{
System.out.println("連接拆世到伺服器");
Socket s=new Socket("localhost",4005);
BufferedReader b=new BufferedReader(new InputStreamReader(System.in));
BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter pw=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
String str="";
String sss="";
while(true)
{
str=b.readLine();
pw.println(str);
pw.flush();
//不理睬大小寫轉換
if(str.equalsIgnoreCase("stop"))
{
System.out.println("服務停止");
break;
}
sss=br.readLine();
System.out.println(sss);
if(sss.equalsIgnoreCase("stop"))
{
System.out.println("服務停止");
break;
}
}
b.close();
br.close();
pw.close();
}
catch(IOException e){}
}
}
2 伺服器端的程序：
package net3;
import java.io.*;
import java.net.*;
public class Server {
public static void main(String[] args){
try{
System.out.println("伺服器備局正在啟動....");
ServerSocket ss=new ServerSocket(4005);
System.out.println("伺服器啟動,等待服務...");
Socket s=ss.accept();
BufferedReader r=new BufferedReader(new InputStreamReader(System.in));
BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
PrintWriter bw=new PrintWriter(new OutputStreamWriter(s.getOutputStream()));
String str="";
String sss="";
while(true)
{
sss=br.readLine();
System.out.println(sss);
if(sss.equalsIgnoreCase("stop"))
{
System.out.println("服務停止");
break;
}
str=r.readLine();
bw.println(str);
bw.flush();
//不理睬大小寫轉換
if(str.equalsIgnoreCase("stop"))
{
System.out.println("服務停止");
break;
}
}
br.close();
r.close();
bw.close();
}
catch(IOException e){}
}
}
例子二：
package test.socket;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
public class TalkMe {
public static void main(String[] args) {
System.out.println("請輸入:IP地址：");
TalkMe talk = new TalkMe();
talk.listener().start();
try {
talk.talker(new BufferedReader(new InputStreamReader(System.in)).readLine()).start();
} catch (IOException e) {
e.printStackTrace();
}
}
private Thread listener(){
return new Thread() {
public void run() {
DataInputStream dataIS = null;
String clientSay;
try {
ServerSocket server = new ServerSocket(9666);
Socket socket = server.accept();
while (true) {
dataIS = new DataInputStream(socket.getInputStream());
clientSay = dataIS.readLine();
System.out.println("Other say:" + clientSay);
}
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
private Thread talker(final String ip){
return new Thread(){
public void run() {
Socket socket = null;
InputStreamReader stdin=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(stdin);
DataInputStream dataIS = new DataInputStream(System.in);
OutputStream os;
PrintStream ps;
String say = "";
boolean flag = true;
while (flag) {
if (flag)
System.out.println("connection ....");
try {
socket = new Socket(ip, 9666);
System.out.println("connection ok.");
flag = true;
os = socket.getOutputStream();
ps = new PrintStream(os);
while (true) {
say = dataIS.readLine();
ps.println(say);
}
} catch (UnknownHostException e) {
try {
sleep(1000);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
} catch (IOException e) {
}
}
}
};
}
}
『陸』 誰能用C語言寫個最簡單socket通信服務端和客戶端示例
網路的Socket數據傳輸是一種特殊的I/O，Socket也是一種文件描述符。Socket也具有一個類似液逗於打開文件的函數調用Socket()，該函數返回一個整型的Socket描述符，隨後的連接建立、數據傳輸等操作都是通過該Socket實現的。
下面用Socket實現一個windows下的c語言socket通信例子，這里我們客棚埋渣戶端傳遞一個字元串，伺服器端進鏈悄行接收。
【伺服器端】
#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>
#include <winsock2.h>
#define SERVER_PORT 5208 //偵聽埠
void main()
『柒』 c語言中關於socket函數的例子
函數說明：socket()用來建立一個新的socket, 也就是向系統注冊, 通知系統建立一通信埠. 參數domain 指定使用何種的地址類型, 完整的定義在/usr/include/bits/socket.h 內, 底下是常見的協議:
PF_UNIX/PF_LOCAL/AF_UNIX/AF_LOCAL UNIX 進程通信協議
PF_INET?AF_INET Ipv4 網路協議
PF_INET6/AF_INET6 Ipv6 網路協議
PF_IPX/AF_IPX IPX-Novell 協議
PF_NETLINK/AF_NETLINK 核心用戶介面裝置
PF_X25/AF_X25 ITU-T X. 25/ISO-8208 協議
PF_AX25/AF_AX25 業余無線AX. 25 協議
PF_ATMPVC/AF_ATMPVC 存取原始 ATM PVCs
PF_APPLETALK/AF_APPLETALK appletalk (DDP)協議
PF_PACKET/AF_PACKET 初級封包介面
參數 type 有下列幾種數值:
1、SOCK_STREAM 提供雙向連續且可信賴的數據流, 即TCP. 支持 OOB 機制, 在所有數據傳送前必須使用connect()來建立連線狀態.
2、SOCK_DGRAM 使用不連續不可信賴的數據包連接
3、SOCK_SEQPACKET 提供連續可信賴的數據包連接
4、SOCK_RAW 提供原始網路協議存取
5、SOCK_RDM 提供可信賴的數據包連接
6、SOCK_PACKET 提供和網路驅動程序直接通信. protocol 用來指定socket 所使用的傳輸協議編號, 通常此參考不用管它, 設為0 即可.
返回值：成功則返回socket 處理代碼, 失敗返回-1.
錯誤代碼：
1、EPROTONOSUPPORT 參數domain 指定的類型不支持參數type 或protocol 指定的協議
2、ENFILE 核心內存不足, 無法建立新的socket 結構
3、EMFILE 進程文件表溢出, 無法再建立新的socket
4、EACCESS 許可權不足, 無法建立type 或protocol 指定的協議
5、ENOBUFS/ENOMEM 內存不足
6、EINVAL 參數domain/type/protocol 不合法
『捌』 用c語言寫個 socket tcp 的
#include <winsock2.h>
#include <stdio.h>
#include <pthread.h>
#pragma comment(lib,"ws2_32.lib")
typedef struct{
SOCKET accpt;
int lock;
}Arg;
void *transfer(void *arg)
{
Arg * info = (Arg *)arg;
SOCKET clientSock;
char recvbuf[102];
char sendBuf[] = "10";
int ret;
memcpy(&clientSock,(void*)&info->accpt,sizeof(clientSock));
info->lock =1;
while (TRUE)
{
ret = send(clientSock,sendBuf,2,0);
if (ret == -1)
{
break;
}
ret = recv(clientSock,recvbuf,102,0);
printf("%s ",recvbuf);
}
return (void *)0;
}
void* timer(void *arg)
{
time_t last = time(NULL);
time_t now;
int i = 20;
while(i--)
{
now = time(NULL);
if(now - last == 1)
{
printf("1s past! ");
last = now;
}
Sleep(500);
}
printf("timer exit. ");
return (void *)0;
}
int main(void) {
WSADATA wsaData;
SOCKET ListenSocket;
SOCKADDR_IN service,client;
int len = sizeof(client);
Arg argument;
pthread_t tid;
char sendBuf[] = "ID=2;WHAT=host";
int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
if (iResult != NO_ERROR) {
printf("Error at WSAStartup() ");
return 1;
}
ListenSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (ListenSocket == INVALID_SOCKET) {
printf("Error at socket(): %ld ", WSAGetLastError());
WSACleanup();
return 1;
}
service.sin_family = AF_INET;
service.sin_addr.s_addr = inet_addr("127.0.0.1");
service.sin_port = htons(27115);
if (bind( ListenSocket,
(SOCKADDR*) &service,
sizeof(service)) == SOCKET_ERROR) {
printf("bind() failed. ");
closesocket(ListenSocket);
WSACleanup();
return 1;
}
if (listen( ListenSocket, 1 ) == SOCKET_ERROR) {
printf("Error listening on socket. ");
closesocket(ListenSocket);
WSACleanup();
return 1;
}
argument.lock = 1;
printf("Waiting for client to connect... ");
pthread_create(&tid,NULL,timer,NULL);
while(TRUE){
argument.accpt = accept( ListenSocket, (SOCKADDR*)&client, &len );
if (argument.accpt == INVALID_SOCKET) {
printf("accept failed: %d ", WSAGetLastError());
closesocket(ListenSocket);
WSACleanup();
return 1;
} else {
printf("accept%s:%d ",inet_ntoa(client.sin_addr),client.sin_port);
while (!argument.lock);
argument.lock = 0;
// sendto(argument.accpt,sendBuf,sizeof(sendBuf),0,(SOCKADDR*)&client,len);
pthread_create(&tid,NULL,transfer,&argument);
//send(AcceptSocket,sendBuf,sizeof(sendBuf),0);
}
}
// No longer need server socket
closesocket(ListenSocket);
WSACleanup();
return 0;
}
發送數據格式按需求。可以發送字元串，也可以發送結構體。如果發送結構體的話，要注意序列化和反序列化。程序例子是伺服器對每個客戶端的connect動作起一個線程去交互。還有一個線程是定時器。
『玖』 C語言socket編程實現網路數據傳輸
僅供參考
// serverTCP.cpp : 定義控制台應用程序的入口點。
//
#include "stdafx.h"
using namespace std;
long long cnt = 0;
void transFile(SOCKET s)
{
printf("新子服務%d......",cnt);
send(s,"welcome to TCP FILE SERVER !",strlen("welcome to TCP FILE SERVER !")+1,0);
char Buf[BUFSIZE];
FILE *fp;
//printf("客戶端已打開\n請輸入存放文件地址：\n");
char FilePath[128]={"0"};
ltoa(cnt,FilePath,10);
if((fp=fopen(FilePath,"wb"))==NULL)
{
printf("文件未打開\n");
return;
}
else
{
send(s,"開始傳送",strlen("開始傳送")+1,0);
//得到文件大小
char Size[20];
long int FileSize=0;
recv(s,Size,21,0);
FileSize=atol(Size);
printf("得到文件大小： %d\n",FileSize);
//開始傳送
char Block[BUFSIZE];
long int x=0;
while (1)
{
x += BUFSIZE;
if(x < FileSize)
{
recv(s,Block,BUFSIZE+1,0);
fwrite(Block,1,BUFSIZE,fp);
}
else
{
recv(s,Block,FileSize+BUFSIZE-x+1,0);
printf("文件接收完畢\n");
fwrite(Block,1,FileSize+BUFSIZE-x,fp);
fclose(fp);
break;
}
}
}
fclose(fp);
closesocket(s);
}
int _tmain(int argc, _TCHAR* argv[])
{
WORD myVersionRequest;
WSADATA wsaData;
myVersionRequest=MAKEWORD(1,1);
int err;
err = WSAStartup(myVersionRequest,&wsaData);
if (!err)
{
printf("伺服器啟動......\n");
}
else
{
printf("伺服器啟動失敗！");
exit(0);
}
SOCKET serSocket = socket(AF_INET,SOCK_STREAM,0);//創建了可識別套接字
SOCKADDR_IN addr;
addr.sin_family=AF_INET;
addr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);//ip地址
addr.sin_port=htons(PORTBASE);//綁定埠
bind(serSocket,(SOCKADDR*)&addr,sizeof(SOCKADDR));//綁定完成
listen(serSocket,ACESIZE);//其中第二個參數代表能夠接收的最多的連接數
SOCKADDR_IN clientAddr;
int len = sizeof(SOCKADDR);
while(1)
{
cnt++;
SOCKET serConn;
serConn = accept(serSocket,(SOCKADDR*)&clientAddr,&len);//如果這里不是accept而是conection的話。。就會不斷的監聽
if(_beginthread((void (*)(void *))transFile, ACESIZE,(void *)serConn) < 0) return 0;
}
return 0;
}
// clientTCP.cpp : 定義控制台應用程序的入口點。
//
#include "stdafx.h"
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
WORD myVersionRequest;
WSADATA wsaData;
myVersionRequest=MAKEWORD(1,1);
int err;
err=WSAStartup(myVersionRequest,&wsaData);
if (!err)
{
printf("已打開套接字\n");
}
else
{
//進一步綁定套接字
printf("套接字未打開!");
return 0;
}
SOCKET cliSocket =socket(AF_INET,SOCK_STREAM,0);
SOCKADDR_IN addr;
char ip_addr[16]={"127.0.0.1"};
addr.sin_addr.S_un.S_addr=inet_addr(ip_addr);
addr.sin_family=AF_INET;
addr.sin_port=htons(PORT);
char ACK[64];
connect(cliSocket,(SOCKADDR*)&addr,sizeof(SOCKADDR));//開始連接
recv(cliSocket,ACK,sizeof(ACK),0);
printf("%s\n",ACK);
FILE *fp;
int FileSize=0;
char Block[BUFSIZE]={"0"};
char FilePath[128]={"0"};
int i=0;
do
{
printf("請輸入文件地址：\n");
gets(FilePath);
i = 0;
if((fp=fopen(FilePath,"rb"))==NULL)
{
i = 1;
printf("文件打開失敗\n");
}
}while(i);
fseek(fp,0L,SEEK_END);
FileSize=ftell(fp);
printf("待傳送文件大小： %d\n",FileSize);
printf("等待伺服器接受......\n");
recv(cliSocket,Block,sizeof(Block),0);
printf("%s\n",Block);
if(strcmp(Block,"開始傳送")==0)
{
char Size[20];
ltoa(FileSize,Size,10);
send(cliSocket,Size,sizeof(Size),0);
fseek(fp,0L,SEEK_SET);
long int y=0;
char trans[BUFSIZE];
while(!feof(fp))
{
fread(trans,1,BUFSIZE,fp);
y=y+BUFSIZE;
if(y<FileSize)
{
send(cliSocket,trans,BUFSIZE+1,0);
}
else
{
send(cliSocket,trans,FileSize+BUFSIZE-y+1,0);
closesocket(cliSocket);
WSACleanup();
}
}
}
printf("文件發送完畢\n");
fclose(fp);
closesocket(cliSocket);
WSACleanup();
system("pause");
return 0;
}
『拾』 C語言 UDP socket 簡單客戶端 編程，急
提一下，你那個地址不好用，換成了127.0.0.1，埠可以用，完全按照要求寫的，編譯沒錯誤，調試通過：
gcc server.c -o server
gcc client.c -o client
打開2個控制台：一個運行 ./server 另一個運行 ./client
server.c:
========================================
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#define BUFFERSIZE 1024
typedef struct sockaddr SA;
int main(void)
{
char buf[BUFFERSIZE];
struct sockaddr_in addr_s;
struct sockaddr_in addr_c;
int sockfd;
socklen_t length;
int i;
if((sockfd = socket(AF_INET,SOCK_DGRAM,0)) == -1)
{
perror("socket fail");
return -1;
}
memset(&addr_s,0,sizeof(addr_s));
addr_s.sin_family = AF_INET;
addr_s.sin_addr.s_addr = inet_addr("127.0.0.1");
addr_s.sin_port = htons(31180);
if(bind(sockfd,(SA *)&addr_s,sizeof(addr_s)) == -1)
{
perror("bind fail");
return -1;
}
length = sizeof(addr_c);
memset(buf,'\0',sizeof(buf));
if(recvfrom(sockfd,buf,sizeof(buf),0
,(SA *)&addr_c,&length) == -1)
{
perror("recvfrom fail");
}
printf("recvfrom client:%s\n",buf);
sendto(sockfd,buf,sizeof(buf),0,(SA *)&addr_c,sizeof(addr_c));
close(sockfd);
}
====================================
client.c:
====================================
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <errno.h>
#define BUFFERSIZE 1024
typedef struct sockaddr SA;
int main(void)
{
int sockfd;
char buf[BUFFERSIZE];
struct sockaddr_in addr_s;
if((sockfd = socket(AF_INET,SOCK_DGRAM,0)) == -1)
{
perror("socket fail");
return -1;
}
memset(&addr_s,0,sizeof(addr_s));
addr_s.sin_family = AF_INET;
addr_s.sin_addr.s_addr = inet_addr("127.0.0.1");
addr_s.sin_port = htons(31180);
memset(buf,'\0',sizeof(buf));
sprintf(buf,"abcde");
if(sendto(sockfd,buf,sizeof(buf)
,0,(SA *)&addr_s,sizeof(addr_s)) < 0)
{
perror("sendto fail");
}
memset(buf,'\0',sizeof(buf));
recvfrom(sockfd,buf,sizeof(buf),0,NULL,NULL);
printf("recvfrom server:%s\n",buf);
close(sockfd);
}