linux udp文件传输,LINUX下实现UDP传输文件

最新推荐文章于 2023-03-21 18:11:48 发布

jian bao

最新推荐文章于 2023-03-21 18:11:48 发布

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文章标签： linux udp文件传输

本文介绍了一个简单的UDP协议下的客户端与服务器文件传输实现方案。客户端通过sendto发送文件路径及文件内容给服务器，服务器端接收文件路径后获取文件名并创建新文件，再接收文件内容并写入新文件中。该方案利用了C语言标准库函数完成文件操作。

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客户端使用sendto

服务器端使用recv

UDP要想用send需要先使用connect

客户端代码

#include

#include //for malloc

#define BUFFER_SIZE 1024

int main()

{

int sockcd;

struct sockaddr_in server;

char recv[4096],send1[4096];

char filepath[100];//file to translate

FILE *fp;

int lenpath; //filepath length

char *buffer;//file buffer

int fileTrans;

buffer = (char *)malloc(sizeof(char)*BUFFER_SIZE);

bzero(buffer,BUFFER_SIZE);

//memset(buffer,0,sizeof(buffer));

if((sockcd = socket(AF_INET,SOCK_DGRAM,0))<0)

{

printf("socket build error!\n");

}

memset(&server,0,sizeof(server));

server.sin_family= AF_INET;

server.sin_port = htons(9999);

if(inet_pton(AF_INET,"192.168.61.143",&server.sin_addr)<0)

{

printf("inet_pton error!\n");

}

while(1)

{

printf("input filepath:\n");

//memset(filepath,'\0',sizeof(filepath));

scanf("%s",filepath);//get filepath

lenpath = sendto(sockcd,filepath,sizeof(filepath),0,(struct sockaddr*)&server,sizeof(server));

//lenpath = send(sockcd,filepath,strlen(filepath),0);// put file path to sever

if(lenpath<0)

{

printf("filepath send error!\n");

}

fp = fopen(filepath,"r");//opne file

sleep(3);

while((fileTrans = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0)

{

printf("fileTrans =%d\n",fileTrans);

if(sendto(sockcd,buffer,fileTrans,0,(struct sockaddr*)&server,sizeof(server))<0)

{

printf("send failed!\n");

break;

}

bzero(buffer,BUFFER_SIZE);

//memset(buffer,0,sizeof(buffer));

}

fclose(fp);

}

close(sockcd);

return 0;

}

服务器端代码

#include

#include //for malloc

#define BUFFER_SIZE 1024

int main()

{

int sockcd;

struct sockaddr_in server;

char recv1[4096],send1[4096];

char filename[100];

char filepath[100];

char *buffer;//file buffer

int fileTrans;

buffer = (char *)malloc(sizeof(char)*BUFFER_SIZE);

bzero(buffer,BUFFER_SIZE);

//memset(buffer,0,sizeof(buffer));

int lenfilepath;

FILE *fp;

int writelength;

if((sockcd = socket(AF_INET,SOCK_DGRAM,0))<0)

{

printf("socket build error!\n");

}

memset(&server,0,sizeof(server));

server.sin_family= AF_INET;

server.sin_addr.s_addr = htonl(INADDR_ANY);

server.sin_port = htons(9999);

if((bind(sockcd,(struct sockaddr*)&server,sizeof(server)))==-1)

{

printf("bind error!\n");

}

while(1)

{

//printf("client IP: %d\n",ntohl(client.sin_addr.s_addr));

//printf("client PORT: %d\n",ntohs(client.sin_port));

memset(filename,'\0',sizeof(filename));

memset(filepath,'\0',sizeof(filepath));

lenfilepath = recv(sockcd,filepath,100,0);

printf("filepath :%s\n",filepath);

if(lenfilepath<0)

{

printf("recv error!\n");

}

else

{

int i=0,k=0;

for(i=strlen(filepath);i>=0;i--)

{

if(filepath[i]!='/')

{

k++;

}

else

break;

}

strcpy(filename,filepath+(strlen(filepath)-k)+1);

}

printf("filename :%s\n",filename);

fp = fopen(filename,"w");

if(fp!=NULL)

{

while(fileTrans =recv(sockcd,buffer,BUFFER_SIZE,0))

{

if(fileTrans<0)

{

printf("recv error!\n");

break;

}

writelength = fwrite(buffer,sizeof(char),fileTrans,fp);

if(writelength

{

printf("write error!\n");

break;

}

bzero(buffer,BUFFER_SIZE);

//memset(buffer,0,sizeof(buffer));

}

printf("recv finished!\n");

fclose(fp);

}

close(sockcd);

return 0;

}