- 论坛徽章:
- 0
|
初学网络编程，我在linux下写了个程序客户端向服务端发送文件，然后服务端接收后返回给客户端受到信息。
但是现在他只能接收到64KB以下大小的文件，打的就收不到了，不知道那初错了。
希望高手帮我看看 ，我是第一次写网络通信的程序，才学了不到一个星期。
server.c服务端
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#define BUFFERMAX 102400
#define FILENAMEMAX 100
int main(int argc, char *argv[])
{
int sockfd, new_sockfd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size, portnumber, i, len;
char buffer[BUFFERMAX];
char filename[FILENAMEMAX];
char c[20] = "i have recive file!";
FILE * fp;
bzero(buffer, sizeof(buffer));
if(argc!=2)
{
fprintf(stderr, "Usage:%s portnumber\a\n", argv[0]);
exit(1);
}
if((portnumber = atoi(argv[1]))<0)
{
fprintf(stderr, "Usage:%s portnumber\a\n", argv[0]);
exit(1);
}
/* 服务器端开始建立socket描述符 */
if((sockfd = socket(AF_INET, SOCK_STREAM,0))==-1)
{
fprintf(stderr, "Socket error:%s\n\a", strerror(errno));
exit(1);
}
/* 服务器端填充 sockaddr结构 */
bzero(&server_addr, sizeof(struct sockaddr_in));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(portnumber);
/* 捆绑sockfd描述符 */
if(bind(sockfd, (struct sockaddr *)(&server_addr), sizeof(struct sockaddr)) == -1)
{
fprintf(stderr, "Bind error:%s\n\a", strerror(errno));
exit(1);
}
/* 监听sockfd描述符 */
if(listen(sockfd, 5) == -1)
{
fprintf(stderr, "Listen error:%s\n\a", strerror(errno));
exit(1);
}
while(1)
{
/* 等待客户程序建立连接 */
sin_size = sizeof(struct sockaddr_in);
if((new_sockfd = accept(sockfd, (struct sockaddr *)(&client_addr), &sin_size)) == -1)
{
fprintf(stderr, "Accept error:%s\n\a", strerror(errno));
exit(1);
}
fprintf(stderr, "Server get connection from %s\n", inet_ntoa(client_addr.sin_addr));
/*接收客户端发送的数据，文件名称，内容*/
recvfrom(new_sockfd, filename, sizeof(filename), 0, &client_addr, sin_size);
recvfrom(new_sockfd, buffer, sizeof(buffer), 0, &client_addr, sin_size);
fp = fopen(filename, "w");
if (fp == NULL)
{
fprintf(stderr, "server open file write error");
exit(1);
}
/*判断文件是否接收成功？成功发送信息到客户端*/
if(fwrite(buffer, strlen(buffer), 1, fp) > 0)
{
fprintf(stderr, "server:%s\n", c);
sendto(new_sockfd, c, strlen(c), 0, &client_addr, sizeof(client_addr));
}
else
{
fprintf(stderr, "server:not recive flie");
}
fclose(fp);
close(new_sockfd);
}
bzero(buffer, sizeof(buffer));
bzero(filename, sizeof(filename));
close(sockfd);
exit(0);
}
客户端
client.c
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#define BUFFERMAX 102400
#define FILENAMEMAX 50
#define PATHNAMEMAX 100
int main(int argc, char *argv[])
{
int sockfd;
char buffer[BUFFERMAX];
char filename[FILENAMEMAX];
char pathname[PATHNAMEMAX] = "send//";
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
struct hostent *host;
int portnumber;
int i, ch;
long long filelength;
char c[20];
FILE *fp;
bzero(buffer, sizeof(buffer));
if(argc!=4)
{
fprintf(stderr, "Usage:%s hostname portnumber filename\a\n", argv[0]);
exit(1);
}
if((host = gethostbyname(argv[1])) == NULL)
{
fprintf(stderr, "Gethostname error\n");
exit(1);
}
if((portnumber=atoi(argv[2]))<0)
{
fprintf(stderr, "Usage:%s hostname portnumber\a\n", argv[0]);
exit(1);
}
/* 客户程序开始建立 sockfd描述符 */
if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)
{
fprintf(stderr, "Socket Error:%s\a\n", strerror(errno));
exit(1);
}
/* 客户程序填充服务端的资料 */
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(portnumber);
server_addr.sin_addr = *((struct in_addr *)host->h_addr);
/* 客户程序发起连接请求 */
if(connect(sockfd, (struct sockaddr *)(&server_addr), sizeof(struct sockaddr)) == -1)
{
fprintf(stderr, "Connect Error:%s\a\n", strerror(errno));
exit(1);
}
/*打开要发送的文件*/
strcat(pathname,argv[3]);
strcpy(filename, argv[3]);
fp = fopen(pathname, "r");
if (fp == NULL)
{
fprintf(stderr, "client open file error\n");
exit(1);
}
/*计算文件长度*/
fseek(fp,0L,SEEK_END);
filelength = ftell(fp)-1;
fseek(fp,0L,SEEK_SET);
/*读取文件内容*/
fread(buffer,1,filelength,fp);
buffer[filelength] = '\0';
/*
ch = fgetc(fp);
for(i=0; (i<BUFFERMAX)&&(feof(fp)==0); i++)
{
buffer = (char)ch;
ch = fgetc(fp);
}
buffer = '\0';
*/
fprintf(stderr, "client send file <= 64KB\n");
/*发送文件名称及内容*/
sendto(sockfd, filename, sizeof(filename), 0, &server_addr, sizeof(server_addr));
sendto(sockfd, buffer, sizeof(buffer), 0, &server_addr, sizeof(server_addr));
/*服务器接收成功后接收成功信息*/
recvfrom(sockfd, c, sizeof(c), 0, &server_addr, sizeof(server_addr));
bzero(pathname, sizeof(pathname));
bzero(filename, sizeof(filename));
bzero(buffer, sizeof(buffer));
fclose(fp);
close(sockfd);
exit(0);
} |
|
免费注册
发表于 2008-03-21 08:35
