Question

我需要一个小脚本，将“\ n exit”追加到〜/ ae23054 /我的代码中所有文件的末尾：

#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>

     int main (void)
     {
       DIR *dp;
       struct dirent *ep;
       const char *path_dir ="~ae23054/Giuseppe";//Inserire la directory qui

       dp = opendir (path_dir);
       if (dp != NULL)
         {
           while (ep = readdir (dp)){
             printf(ep->d_name);
             char nome_file[256]=ep->d_name;

             FILE *fd=fopen(nome_file, a+);
             fprint(fd,"\nEXIT");
             fclose(fd);
           }
           (void) closedir (dp);
         }
       else
         perror ("Non posso aprire la directory");

       return -1;
}

但我在编译时遇到此错误：gcc test.c

esempio_giuseppe.c: In function ‘main’:
esempio_giuseppe.c:16: error: invalid initializer
esempio_giuseppe.c:18: error: ‘a’ undeclared (first use in this function)
esempio_giuseppe.c:18: error: (Each undeclared identifier is reported only once
esempio_giuseppe.c:18: error: for each function it appears in.)
esempio_giuseppe.c:18: error: expected expression before ‘)’ token

感谢您的帮助

我有这个错误：

char nome_file[256];

strcpy(nome_file, ep->d_name);


ae23054@el088soh:/home/risorse/ae23054/Giuseppe> gcc esempio_giuseppe.c
esempio_giuseppe.c: In function ‘main’:
esempio_giuseppe.c:18: warning: incompatible implicit declaration of built-in function   ‘strcpy’
esempio_giuseppe.c:20: error: ‘a’ undeclared (first use in this function)
esempio_giuseppe.c:20: error: (Each undeclared identifier is reported only once
esempio_giuseppe.c:20: error: for each function it appears in.)
esempio_giuseppe.c:20: error: expected expression before ‘)’ token

Answer 1

您需要将fopen的第二个参数设为字符串，因为它需要const char*

FILE *fd=fopen(nome_file, "a+");
                          ^  ^
                          ^  ^

而不是

FILE *fd=fopen(nome_file, a+);

另请参阅@AlterMann关于文件名缓冲区的答案。

Answer 2

问题出在char nome_file[256]=ep->d_name; 您需要使用strcpy()复制字符串，例如strcpy(nome_file,ep->d_name);，并将FILE *fd=fopen(nome_file, a+);更改为FILE *fd=fopen(nome_file, "a+");

C语言中的简单程序，用于将字符串附加到目录中的所有文件

2 个答案: