网络图片传输

/*socket_client.c，运行在arm9 Linux开发板中*/

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <netdb.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/socket.h>

#define PORT 4321

#define BUFFER_SIZE 8*1024

int main(int argc, char *argv[])

{

int sock_fd,sendbytes;

FILE *file_fd;

int buf[BUFFER_SIZE]; // It is the integer

struct hostent *host;

struct sockaddr_in serv_addr;

long int num;

memset(buf,0,sizeof(buf));

file_fd = fopen("test-mmap.jpg","rb");

/* if(-1 == (num = fread(buf,1,sizeof(buf),file_fd)))

{

perror("fopen");

exit(1);

}

printf("file words num is : %d\n\n",num);

*/

if(argc < 2) //It was 3 first time.

{

fprintf(stderr,"USAGE:./client Hostname(or ip address)Text\n");

exit(1);

}

if(NULL == (host = gethostbyname(argv[1])))

{

perror("gethostbyname");

exit(1);

}

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

//scanf("%s",buf);

//sprintf(buf,"%s",argv[2]);

if(-1 == (sock_fd = socket(AF_INET,SOCK_STREAM,0)))

{

perror("socket");

exit(1);

}

serv_addr.sin_family = AF_INET;

serv_addr.sin_port = htons(PORT);

serv_addr.sin_addr = *((struct in_addr*)host->h_addr);

bzero(&(serv_addr.sin_zero),8);

if(-1 == connect(sock_fd,(struct sockaddr *)&serv_addr,sizeof(struct sockaddr)))

{

perror("connect");

exit(1);

}

if(-1 == (num = fread(buf,1,sizeof(buf),file_fd)))

{

perror("fopen");

exit(1);

}

if(-1 == (sendbytes = send(sock_fd,buf,num,0))) //send()

{

perror("send");

exit(1);

}

if(num != sendbytes)

{

printf("num != sendbytes\n");

//break;

}

printf("file words num is :%d\n",num);

printf("-----sendbytes is :%d\n\n",sendbytes);

close(sock_fd);

close(file_fd);

exit(0);

}

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-----------------------------------------------------------------------------------

/*socket_server.c,运行在虚拟机Linux中*/

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <unistd.h>

#include <netinet/in.h>

#define PORT 4321 //PORT number must be the same with client

#define BUFFER_SIZE 8*1024 // 1024 * 1024 = 1048576

#define MAX_QUE_CONN_NM 10

int main()

{

struct sockaddr_in server_sockaddr,client_sockaddr;

int sin_size,recvbytes;

int sock_fd,client_fd;

FILE *file_fd;

char buf[BUFFER_SIZE];

long int num;

int ii;

if(-1 == (sock_fd = socket(AF_INET,SOCK_STREAM,0))) //SOCK_STREAM

{

perror("socket");

exit(1);

}

printf("Socket id = %d(sock_fd)\n",sock_fd);

server_sockaddr.sin_family = AF_INET;

server_sockaddr.sin_port = htons(PORT);

server_sockaddr.sin_addr.s_addr = INADDR_ANY;

bzero(&(server_sockaddr.sin_zero),8);

int i = 1;

setsockopt(sock_fd,SOL_SOCKET,SO_REUSEADDR,&i,sizeof(i));

if(-1 == bind(sock_fd,(struct sockaddr *)&server_sockaddr,sizeof(struct sockaddr)))

{

perror("bind");

exit(1);

}

printf("Bind success!\n");

if(-1 == listen(sock_fd,MAX_QUE_CONN_NM))

{

perror("listen");

exit(1);

}

printf("Listening....\n");

if(-1 == (client_fd = accept(sock_fd,(struct sockaddr *)&client_sockaddr,&sin_size)))

{

perror("accept");

exit(1);

}

memset(buf,0,sizeof(buf));

if(-1 == (recvbytes = recv(client_fd,buf,sizeof(buf),0)))

{

perror("recv");

exit(1);

}

printf("sizeof(buf)= %d\n",sizeof(buf));

printf("receive bytes num is :%d\n\n",recvbytes);

//FILE * abc_fd;

file_fd = fopen("./test-mmap.jpg","wb");

if(-1 == (num = fwrite(buf,sizeof(buf),1,file_fd)))

{

perror("fwrite date ");

exit(1);

}

// printf("Received a message: %s\n",buf);

close(sock_fd);

fclose(file_fd);

exit(0);

}

知道看别人的代码是件挺痛苦的事情，尤其是我这样的没有注释的代码（因为是在Linux下编程，没有安装中文输入法，英文太麻烦，反正是改的例子，所以就没写了）还好代码不是很长，还是很希望能有高人帮我看看，传输到虚拟机中图片总是显示不全，不知道问题出在哪里，在这里先谢谢了。

自学嵌入式真不是一件容易的事情。。。


这里是完整图片的样子


这是传输不完整的图片

总是丢失数据，小弟刚学socket编程，不知道哪里有什么问题需要注意，还请大虾们指点一下，感激不尽。。。