您好，我正在尝试制作一个我想要这些东西的 TCP 客户端/服务器。客户端将给出文件名或文件名的路径。服务器将找到该文件并提供以下详细信息：权限、大小、所有者、所有者组、修改/创建日期、字数、用户 ID 和优先级，如果出现问题，将这些信息发送给 -1 的客户端。客户端将打印这些详细信息。我已经做了很多这样的事情，但我有一个很大的问题，所以我无法继续，我的问题是服务器无法识别文件的路径，但我尝试命名文件并通信正常。我在做什么错误的？先感谢您
CLIENT
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buffer[1024];
if (argc < 3) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
printf("Please enter the filename or path of filename: ");
bzero(buffer,1024);
fgets(buffer,1024,stdin);
n = write(sockfd,buffer,strlen(buffer));
if (n < 0)
error("ERROR writing to socket");
bzero(buffer,1024);
n = read(sockfd,buffer,1024);
if (n < 0)
error("ERROR reading from socket");
printf("%s\n",buffer);
return 0;
SERVER
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/resource.h>
#include <sys/time.h>
void error(char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
FILE *fp;
int sockfd, newsockfd, portno, clilen,i;
char buffer[1024],filename[1024];
char * pPath;
struct sockaddr_in serv_addr, cli_addr;
int n;
int which = PRIO_PROCESS;
id_t pid;
int ret;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr,
&clilen);
if (newsockfd < 0)
error("ERROR on accept");
bzero(buffer,1024);
n = read(newsockfd,buffer,1024);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
system("ls -al 1.txt > ls.txt");
system("wc -w 1.txt > wc.txt");
/* pPath = getenv ("PATH");
if (pPath!=NULL)
printf ("The current path is: %s\n",pPath);
system("touch path.txt");
fp=fopen("path.txt","w");
if (fp==NULL) exit(1);
fprintf(fp,pPath);
fclose(fp); */
pid = getpid();
ret = getpriority(which, pid);
printf("priority %d user id %d ret %d",which,pid,ret);
system("paste ls.txt wc.txt user.txt > info.txt");
fp=fopen("info.txt","r");
if (fp==NULL) exit(1);
for(int i=0;i<1000;i++){
fscanf(fp,"%c",&buffer[i]);
}
fclose(fp);
n = write(newsockfd,buffer,1024);
if (n < 0) error("ERROR writing to socket");
return 0;
}
}`
感谢您的快速回复。具体来说，教授没有要求我们制作我创建的这个 txt 文件，但我创建的原因是我找不到解决方案，我无法将所有内容写入缓冲区。应该是这样的：
缓冲区我来自客户端的路径从缓冲区中找到路径文件（这是我有问题的地方）ls -al 写入缓冲区（我将其写入.txt）wc 写入缓冲区（我将其写入.txt）路径写入缓冲区（还没有这样做）用户信息写入缓冲区（还没有这样做）缓冲区发送到客户端客户端打印所有这些信息的缓冲区
我试过 sprintf 但我不明白你是如何使用它的，但是这个命令看起来比我的要好，谢谢:)。如果我理解得很好，No 会通过缓冲区。