linux下socket通信，server和client简单例子（二）

2. [代码c代码 client部分     

001

client.c

002

003	#include <netinet/in.h>    // for sockaddr_in

004	#include <sys/types.h>    // for socket

005	#include <sys/socket.h>    // for socket

006	#include <stdio.h>        // for printf

007	#include <stdlib.h>        // for exit

008	#include <string.h>        // for bzero

009

/*

010	#include <sys/types.h>

011	#include <sys/stat.h>

012	#include <fcntl.h>

013	#include <unistd.h>

014

*/

015

016	#define HELLO_WORLD_SERVER_PORT    6666

017	#define BUFFER_SIZE 1024

018	#define FILE_NAME_MAX_SIZE 512

019

020	int main(int argc, char **argv)

021

{

022	if (argc != 2)

023

{

024	printf("Usage: ./%s ServerIPAddress\n",argv[0]);

025

exit(1);

026

}

027

028	//设置一个socket地址结构client_addr,代表客户机internet地址, 端口

029	struct sockaddr_in client_addr;

030	bzero(&client_addr,sizeof(client_addr)); //把一段内存区的内容全部设置为0

031	client_addr.sin_family = AF_INET;    //internet协议族

032	client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址

033	client_addr.sin_port = htons(0);    //0表示让系统自动分配一个空闲端口

034	//创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket

035	int client_socket = socket(AF_INET,SOCK_STREAM,0);

036	if( client_socket < 0)

037

{

038	printf("Create Socket Failed!\n");

039

exit(1);

040

}

041	//把客户机的socket和客户机的socket地址结构联系起来

042	if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))

043

{

044	printf("Client Bind Port Failed!\n");

045

exit(1);

046

}

047

048	//设置一个socket地址结构server_addr,代表服务器的internet地址, 端口

049	struct sockaddr_in server_addr;

050	bzero(&server_addr,sizeof(server_addr));

051	server_addr.sin_family = AF_INET;

052	if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数

053

{

054	printf("Server IP Address Error!\n");

055

exit(1);

056

}

057	server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);

058	socklen_t server_addr_length = sizeof(server_addr);

059	//向服务器发起连接,连接成功后client_socket代表了客户机和服务器的一个socket连接

060	if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)

061

{

062	printf("Can Not Connect To %s!\n",argv[1]);

063

exit(1);

064

}

065

066	char file_name[FILE_NAME_MAX_SIZE+1];

067	bzero(file_name, FILE_NAME_MAX_SIZE+1);

068	printf("Please Input File Name On Server:\t");

069	scanf("%s", file_name);

070

071	char buffer[BUFFER_SIZE];

072	bzero(buffer,BUFFER_SIZE);

073	strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));

074	//向服务器发送buffer中的数据

075	send(client_socket,buffer,BUFFER_SIZE,0);

076

077	//    int fp = open(file_name, O_WRONLY|O_CREAT);

078	//    if( fp < 0 )

079	FILE * fp = fopen(file_name,"w");

080	if(NULL == fp )

081

{

082	printf("File:\t%s Can Not Open To Write\n", file_name);

083

exit(1);

084

}

085

086	//从服务器接收数据到buffer中

087	bzero(buffer,BUFFER_SIZE);

088	int length = 0;

089	while( length = recv(client_socket,buffer,BUFFER_SIZE,0))

090

{

091	if(length < 0)

092

{

093	printf("Recieve Data From Server %s Failed!\n", argv[1]);

094

break;

095

}

096	//        int write_length = write(fp, buffer,length);

097	int write_length = fwrite(buffer,sizeof(char),length,fp);

098	if (write_length<length)

099

{

100	printf("File:\t%s Write Failed\n", file_name);

101

break;

102

}

103	bzero(buffer,BUFFER_SIZE);

104

}

105	printf("Recieve File:\t %s From Server[%s] Finished\n",file_name, argv[1]);

106

107	close(fp);

108	//关闭socket

109	close(client_socket);

110

return 0;

111

}