如果接收正常就OK了?你发送到广播地址,接收到的是服务器发出的.
发送 ->to 255.255.255.255
接受 ->bind 0.0.0.0 ->from server_addr
要不然就是你没有说清楚
---------------------------
你希望服务器收到自己的广播？那个不是保证可以正确的。不一定会收到几个，也可能没有。
传文件最好用个TCP。UDP会丢包的////////////////////////////////////
//客户端代码
///////////////////////////////////
//本文件是客户机的代码
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
#include <time.h> //for time_t and time
#include <arpa/inet.h>
#define HELLO_WORLD_SERVER_PORT7754
#define BUFFER_SIZE 1024
int main(int argc, char **argv)
{
if (argc != 2)
{
printf("Usage: ./%s ServerIPAddress\n",argv[0])
exit(1)
}
//time_t now
FILE *stream
//设置一个socket地址结构client_addr,代表客户机internet地址, 端口
struct sockaddr_in client_addr
bzero(&client_addr,sizeof(client_addr))//把一段内存区的内容全部设置为0
client_addr.sin_family = AF_INET //internet协议族
client_addr.sin_addr.s_addr = htons(INADDR_ANY)//INADDR_ANY表示自动获取本机地址
client_addr.sin_port = htons(0) //0表示让系统自动分配一个空闲端口
//创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket
int client_socket = socket(AF_INET,SOCK_STREAM,0)
if( client_socket <0)
{
printf("Create Socket Failed!\n")
exit(1)
}
//把客户机的socket和客户机的socket地址结构联系起来
if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
{
printf("Client Bind Port Failed!\n")
exit(1)
}
//设置一个socket地址结构server_addr,代表服务器的internet地址, 端口
struct sockaddr_in server_addr
bzero(&server_addr,sizeof(server_addr))
server_addr.sin_family = AF_INET
if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数
{
printf("Server IP Address Error!\n")
exit(1)
}
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT)
socklen_t server_addr_length = sizeof(server_addr)
//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
if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) <0)
{
printf("Can Not Connect To %s!\n",argv[1])
exit(1)
}
char buffer[BUFFER_SIZE]
bzero(buffer,BUFFER_SIZE)
//从服务器接收数据到buffer中
int length = recv(client_socket,buffer,BUFFER_SIZE,0)
if(length <0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1])
exit(1)
}
printf("\n%s\n",buffer)
bzero(buffer,BUFFER_SIZE)
bzero(buffer,BUFFER_SIZE)
strcpy(buffer,"Hello, World! From Client\n")
//向服务器发送buffer中的数据
send(client_socket,buffer,BUFFER_SIZE,0)
if((stream = fopen("data","w+t"))==NULL)
{
printf("The file 'data' was not opened! \n")
}
else
bzero(buffer,BUFFER_SIZE)
length = 0
while( length = recv(client_socket,buffer,BUFFER_SIZE,0))
{
if(length <0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1])
break
}
int write_length = fwrite(buffer,sizeof(char),length,stream)
if (write_length<length)
{
printf("File is Write Failed\n")
break
}
bzero(buffer,BUFFER_SIZE)
}
printf("Recieve File From Server[%s] Finished\n", argv[1])
//关闭 文件
fclose(stream)
//关闭socket
close(client_socket)
return 0
}
////////////////////////////////////
//服务器代码
///////////////////////////////////
//本文件是服务器的代码
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
#include <time.h> //for time_t and time
#define HELLO_WORLD_SERVER_PORT 7754
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
int main(int argc, char **argv)
{
//设置一个socket地址结构server_addr,代表服务器internet地址, 端口
struct sockaddr_in server_addr
bzero(&server_addr,sizeof(server_addr))//把一段内存区的内容全部设置为0
server_addr.sin_family = AF_INET
server_addr.sin_addr.s_addr = htons(INADDR_ANY)
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT)
// time_t now
FILE *stream
//创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket
int server_socket = socket(AF_INET,SOCK_STREAM,0)
if( server_socket <0)
{
printf("Create Socket Failed!")
exit(1)
}
//把socket和socket地址结构联系起来
if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
{
printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT)
exit(1)
}
//server_socket用于监听
if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
{
printf("Server Listen Failed!")
exit(1)
}
while (1) //服务器端要一直运行
{
struct sockaddr_in client_addr
socklen_t length = sizeof(client_addr)
int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length)
if ( new_server_socket <0)
{
printf("Server Accept Failed!\n")
break
}
char buffer[BUFFER_SIZE]
bzero(buffer, BUFFER_SIZE)
strcpy(buffer,"Hello,World! 从服务器来！")
strcat(buffer,"\n")//C语言字符串连接
send(new_server_socket,buffer,BUFFER_SIZE,0)
bzero(buffer,BUFFER_SIZE)
//接收客户端发送来的信息到buffer中
length = recv(new_server_socket,buffer,BUFFER_SIZE,0)
if (length <0)
{
printf("Server Recieve Data Failed!\n")
exit(1)
}
printf("\n%s",buffer)
if((stream = fopen("/home/administrator/110405A000.jpg","r"))==NULL)
{
printf("The file 'data1' was not opened! \n")
exit(1)
}
else
printf("The file 'filename' was opened! \n")
bzero(buffer,BUFFER_SIZE)
int lengsize = 0
while((lengsize = fread(buffer,1,1024,stream)) >0)
{
printf("lengsize = %d\n",lengsize)
if(send(new_server_socket,buffer,lengsize,0)<0)
{
printf("Send File is Failed\n")
break
}
bzero(buffer, BUFFER_SIZE)
}
if(fclose(stream))
printf("The file 'data' was not closed! \n")
exit(1)
//关闭与客户端的连接
close(new_server_socket)
}
//关闭监听用的socket
close(server_socket)
return 0
}
要下班了，时间急，不写代码了先给你一个思路1 实现最简单的udp socket 模型，实现发送一个字符串。
2 实现一个简单的打开文件，读取文件的例子，如用fgets(),类似的函数有很多，然后再把读取的文件内容忘另一个文件里写(相关函数fopen(),write(),read())。
3 把上面两个函数结合到一起，在客户端实现打开要传送的文件，按一定的大小读取，读取后调用sendto（）发送到服务器端。在服务器端创建一个文件，然后调用recvfrom（）接受客户端发送过来的数据，向来是创建的那个文件中写。
下面是改好的udp发送文件的例子。
服务器端程序的编译
gcc -o file_server file_server
客户端程序的编译
gcc -o file_client file_client.c
服务器程序和客户端程应当分别运行在2台计算机上.
服务器端程序的运行,在一个计算机的终端执行
./file_server
客户端程序的运行,在另一个计算机的终端中执行
./file_client 运行服务器程序的计算机的IP地址
根据提示输入要传输的服务器上的文件，该文件在服务器的运行目录上
在实际编程和测试中,可以用2个终端代替2个计算机,这样就可以在一台计算机上测试网络程序,
服务器端程序的运行,在一个终端执行
./file_server
客户端程序的运行,在另一个终端中执行
./file_client 127.0.0.1
说明: 任何计算机都可以通过127.0.0.1访问自己. 也可以用计算机的实际IP地址代替127.0.0.1
//////////////////////////////////////////////////////////////////////////////////////
// file_server.c 文件传输顺序服务器示例
//////////////////////////////////////////////////////////////////////////////////////
//本文件是服务器的代码
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
/*
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
*/
#define HELLO_WORLD_SERVER_PORT 6666
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
int main(int argc, char **argv)
{
//设置一个socket地址结构server_addr,代表服务器internet地址, 端口
struct sockaddr_in server_addr， pcliaddr
bzero(&server_addr,sizeof(server_addr))//把一段内存区的内容全部设置为0
server_addr.sin_family = AF_INET
server_addr.sin_addr.s_addr = htons(INADDR_ANY)
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT)
//创建用于internet的据报套接字（UDPt,用server_socket代表服务器socket
// 创建数据报套接字（UDP）
int server_socket = socket(PF_INET,SOCK_DGRAM,0)
if( server_socket <0)
{
printf("Create Socket Failed!")
exit(1)
}
//把socket和socket地址结构联系起来
if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
{
printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT)
exit(1)
}
while (1) //服务器端要一直运行
{
//定义客户端的socket地址结构client_addr
struct sockaddr_in client_addr
socklen_t n = sizeof(client_addr)
int length
char buffer[BUFFER_SIZE]
bzero(buffer, BUFFER_SIZE)
length = recvfrom(new_server_socket,buffer,BUFFER_SIZE,0,&pcliaddr,&n)
if (length <0)
{
printf("Server Recieve Data Failed!\n")
break
}
char file_name[FILE_NAME_MAX_SIZE+1]
bzero(file_name, FILE_NAME_MAX_SIZE+1)
strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer))
// int fp = open(file_name, O_RDONLY)
// if( fp <0 )
FILE * fp = fopen(file_name,"r")
if(NULL == fp )
{
printf("File:\t%s Not Found\n", file_name)
}
else
{
bzero(buffer, BUFFER_SIZE)
int file_block_length = 0
// while( (file_block_length = read(fp,buffer,BUFFER_SIZE))>0)
while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0)
{
printf("file_block_length = %d\n",file_block_length)
//发送buffer中的字符串到new_server_socket,实际是给客户端
if(send(new_server_socket,buffer,file_block_length,0)<0)
{
printf("Send File:\t%s Failed\n", file_name)
break
}
bzero(buffer, BUFFER_SIZE)
}
// close(fp)
fclose(fp)
printf("File:\t%s Transfer Finished\n",file_name)
}
}
}
//////////////////////////////////////////////////////////////////////////////////////
// file_client.c 文件传输客户端程序示例
//////////////////////////////////////////////////////////////////////////////////////
//本文件是客户机的代码
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
/*
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
*/
#define HELLO_WORLD_SERVER_PORT 6666
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512
int main(int argc, char **argv)
{
if (argc != 2)
{
printf("Usage: ./%s ServerIPAddress\n",argv[0])
exit(1)
}
//设置一个socket地址结构client_addr,代表客户机internet地址, 端口
struct sockaddr_in client_addr
bzero(&client_addr,sizeof(client_addr))//把一段内存区的内容全部设置为0
client_addr.sin_family = AF_INET //internet协议族
client_addr.sin_addr.s_addr = htons(INADDR_ANY)//INADDR_ANY表示自动获取本机地址
client_addr.sin_port = htons(0) //0表示让系统自动分配一个空闲端口
//创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket
int client_socket = socket(AF_INET,SOCK_DGRAM,0)
if( client_socket <0)
{
printf("Create Socket Failed!\n")
exit(1)
}
//设置一个socket地址结构server_addr,代表服务器的internet地址, 端口
struct sockaddr_in server_addr
bzero(&server_addr,sizeof(server_addr))
server_addr.sin_family = AF_INET
if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数
{
printf("Server IP Address Error!\n")
exit(1)
}
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT)
socklen_t server_addr_length = sizeof(server_addr)
char file_name[FILE_NAME_MAX_SIZE+1]
bzero(file_name, FILE_NAME_MAX_SIZE+1)
printf("Please Input File Name On Server:\t")
scanf("%s", file_name)
char buffer[BUFFER_SIZE]
bzero(buffer,BUFFER_SIZE)
strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name))
//向服务器发送buffer中的数据
socklen_t n = sizeof(server_addr)
sendto(client_socket,buffer,BUFFER_SIZE,0,(struct sockaddr*)&server_addr,n)
// int fp = open(file_name, O_WRONLY|O_CREAT)
// if( fp <0 )
FILE * fp = fopen(file_name,"w")
if(NULL == fp )
{
printf("File:\t%s Can Not Open To Write\n", file_name)
exit(1)
}
//从服务器接收数据到buffer中
bzero(buffer,BUFFER_SIZE)
int length = 0
while( length = recv(client_socket,buffer,BUFFER_SIZE,0))
{
if(length <0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1])
break
}
// int write_length = write(fp, buffer,length)
int write_length = fwrite(buffer,sizeof(char),length,fp)
if (write_length<length)
{
printf("File:\t%s Write Failed\n", file_name)
break
}
bzero(buffer,BUFFER_SIZE)
}
printf("Recieve File:\t %s From Server[%s] Finished\n",file_name, argv[1])
return 0
}
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