读取目录中的每个文件 (unix/posix)
reading every file in directories (unix/posix)
我坚持 unix 系统编程,并且是初学者。假设有一个目录是X。有一个文件(text1.txt)和另一个目录是X中的Y。最后,有两个文件(text2.noExtension)和text3.noExtension)另一个目录是 Y 中的 Z。我的目标是读取文件并输入目录,直到没有目录为止。坦率地说,我真的不知道如何继续下去。
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
struct dirent *direntp;
DIR *dirp;
if (argc != 2) {
fprintf(stderr, "Usage: %s directory_name\n", argv[0]);
return 1; }
if ((dirp = opendir(argv[1])) == NULL)
{
perror ("Failed to open directory");
return 1;
}
while ((direntp = readdir(dirp)) != NULL)
printf("%s\n", direntp->d_name);
while ((closedir(dirp) == -1) && (errno == EINTR)) ;
return 0;
}
如果要列出所有目录和子目录,请尝试递归。例如:
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void listOfDir(char * dirname, int level)
{
struct dirent *direntp;
DIR *dirp;
char *subdirname;
if ((dirp = opendir(dirname)) == NULL)
{
return;
}
while ((direntp = readdir(dirp)) != NULL)
{
if(strcmp(direntp->d_name, ".")==0 || strcmp(direntp->d_name, "..")==0)
continue; // skip current and parent directories
printf("%*c%s\n", level, '>', direntp->d_name);
if( direntp->d_type == 4)
{
// build child dir name and call listOfDir
subdirname = (char*)malloc(strlen(direntp->d_name) + strlen(dirname) + 2);
strcpy(subdirname, dirname);
strcat(subdirname, "/");
strcat(subdirname, direntp->d_name);
listOfDir(subdirname, level+1);
free(subdirname);
}
}
closedir(dirp);
}
int main(int argc, char *argv[]) {
struct dirent *direntp;
DIR *dirp;
if (argc != 2) {
fprintf(stderr, "Usage: %s directory_name\n", argv[0]);
return 1;
}
listOfDir(argv[1], 1);
return 0;
}
像printf("%*c", level, '>')
这样的表达式只是为了嵌套的elach级别缩进
我坚持 unix 系统编程,并且是初学者。假设有一个目录是X。有一个文件(text1.txt)和另一个目录是X中的Y。最后,有两个文件(text2.noExtension)和text3.noExtension)另一个目录是 Y 中的 Z。我的目标是读取文件并输入目录,直到没有目录为止。坦率地说,我真的不知道如何继续下去。
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
int main(int argc, char *argv[]) {
struct dirent *direntp;
DIR *dirp;
if (argc != 2) {
fprintf(stderr, "Usage: %s directory_name\n", argv[0]);
return 1; }
if ((dirp = opendir(argv[1])) == NULL)
{
perror ("Failed to open directory");
return 1;
}
while ((direntp = readdir(dirp)) != NULL)
printf("%s\n", direntp->d_name);
while ((closedir(dirp) == -1) && (errno == EINTR)) ;
return 0;
}
如果要列出所有目录和子目录,请尝试递归。例如:
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void listOfDir(char * dirname, int level)
{
struct dirent *direntp;
DIR *dirp;
char *subdirname;
if ((dirp = opendir(dirname)) == NULL)
{
return;
}
while ((direntp = readdir(dirp)) != NULL)
{
if(strcmp(direntp->d_name, ".")==0 || strcmp(direntp->d_name, "..")==0)
continue; // skip current and parent directories
printf("%*c%s\n", level, '>', direntp->d_name);
if( direntp->d_type == 4)
{
// build child dir name and call listOfDir
subdirname = (char*)malloc(strlen(direntp->d_name) + strlen(dirname) + 2);
strcpy(subdirname, dirname);
strcat(subdirname, "/");
strcat(subdirname, direntp->d_name);
listOfDir(subdirname, level+1);
free(subdirname);
}
}
closedir(dirp);
}
int main(int argc, char *argv[]) {
struct dirent *direntp;
DIR *dirp;
if (argc != 2) {
fprintf(stderr, "Usage: %s directory_name\n", argv[0]);
return 1;
}
listOfDir(argv[1], 1);
return 0;
}
像printf("%*c", level, '>')
这样的表达式只是为了嵌套的elach级别缩进