我希望读取特定文件夹中的所有文本文件。这些文件的名称没有任何共同的模式——否则任务会更容易。
//read a file from the directory
//Perform a common operation
//write output to a common file
//read the next file
如果我也可以处理子文件夹,那就太好了,但即使是基本的实现也足够了。
我尝试查看之前提出的相关问题(here https://stackoverflow.com/q/2918579/1295278, here https://stackoverflow.com/q/1844688/1295278, here https://stackoverflow.com/q/5840443/1295278 and here https://stackoverflow.com/q/5426398/1295278),但他们都没有给出我需要的 C 和 Linux 特定答案。
edit:所以,这就是我根据收到的答案写的-
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>
#include <unistd.h>
#include <errno.h>
int main(int argc, char **argv)
{
DIR* FD;
struct dirent* in_file;
FILE *output_file;
FILE *entry_file;
char buffer[BUFSIZ];
/* Opening common file for writing */
output_file = fopen("/home/pnp/snort_rules_folder/rulesoutput.txt", "a+");
if (output_file == NULL)
{
fprintf(stderr, "Error : Failed to open output_file\n");
return 1;
}
/* Scanning the in directory */
if (NULL == (FD = opendir ("/home/pnp/snort_rules_folder/rules")))
{
fprintf(stderr, "Error : Failed to open input directory\n");
fclose(output_file);
return 1;
}
while ((in_file = readdir(FD)))
{
/* On linux/Unix we don't want current and parent directories
* If you're on Windows machine remove this two lines
*/
if (!strcmp (in_file->d_name, "."))
continue;
if (!strcmp (in_file->d_name, ".."))
continue;
/* Open directory entry file for common operation */
/* TODO : change permissions to meet your need! */
entry_file = fopen(in_file->d_name, "r");
if (entry_file == NULL)
{
fprintf(stderr, "Error : Failed to open entry file\n");
fclose(output_file);
return 1;
}
/* Doing some stuff with entry_file : */
while (fgets(buffer, BUFSIZ, entry_file) != NULL)
{
/* Use fprintf or fwrite to write some stuff into common_file*/
}
fprintf(output_file, "reading file %s", in_file->d_name);
/* When you finish with the file, close it */
fclose(entry_file);
}
/* Don't forget to close common file before leaving */
fclose(output_file);
return 0;
}
收到错误-
pnp@pnp-laptop:~/snort_rules_folder$ ./a.out
错误:无法打开条目文件