linux如何遍历键值对

通过【Map.keyset()】使用【foreach】遍历key和value。唯闭linux通过【Map.keyset()】逗山源使用【foreach】遍历key和value遍历键值对，Linux是一种自由和开山态放源代码的类UNIX *** 作系统。该 *** 作系统的内核由林纳斯·托瓦兹在1991年10月5日首次发布。

UNIX环境高级橘尺带编程，或者LINUX程序设计里头都有这个例子。

从《LINUX程序设计第二版》当中找了个print2.c的代码给你

/* We start with the appropriate headers and then a function, printdir,

which prints out the current directory.

It will recurse for subdirectories, using the depth parameter is used for indentation. */

#include <unistd.h>

#include <stdio.h>

#include <dirent.h>

#include <string.h>

#include <sys/stat.h>圆芦

void printdir(char *dir, int depth)

{

DIR *dp

struct dirent *entry

struct stat statbuf

if((dp = opendir(dir)) == NULL) {

fprintf(stderr,"cannot open directory: %s\n", dir)

return

}

chdir(dir)

while((entry = readdir(dp)) != NULL) {

lstat(entry->d_name,&statbuf)

if(S_ISDIR(statbuf.st_mode)) {

/* Found a directory, but ignore . and .. */

if(strcmp(".",entry->d_name) == 0 ||

strcmp("..",entry->d_name) == 0)

continue

printf("%*s%s/\n",depth,"",entry->d_name)

/* Recurse at a new indent level */

printdir(entry->d_name,depth+4)

}

else printf("%*s%s\n",depth,"",entry->d_name)

}

chdir("..")

closedir(dp)

}

/* Now we move onto the main function. */

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

{

char *topdir, pwd[2]="."

if (argc != 2)

topdir=pwd

else

topdir=argv[1]

printf("困芹Directory scan of %s\n",topdir)

printdir(topdir,0)

printf("done.\n")

exit(0)

}

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