LINUX下实现UDP传输文件

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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 <stdio.h>#include <sys/socket.h>#include <sys/types.h>#include <string.h>#include <netinet/in.h>#include <errno.h>#include <memory.h> #include <stdlib.h>  //for malloc#define BUFFER_SIZE 1024int 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 <stdio.h>#include <sys/socket.h>#include <sys/types.h>#include <string.h>#include <netinet/in.h>#include <errno.h>#include <memory.h> #include <stdlib.h>  //for malloc#define BUFFER_SIZE 1024int 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 <fileTrans)                    {                        printf("write error!\n");                        break;                    }                    bzero(buffer,BUFFER_SIZE);                     //memset(buffer,0,sizeof(buffer));                }                printf("recv finished!\n");                fclose(fp);            }    }    close(sockcd);    return 0;}

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