APUE统计目录各类文件个数(c++版)

最新推荐文章于 2024-03-24 22:36:13 发布

原创最新推荐文章于 2024-03-24 22:36:13 发布 · 359 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#APUE #c++ #目录与文件

APUE 专栏收录该内容

16 篇文章

订阅专栏

本文介绍了一个C++实现的文件系统统计工具，该工具能够遍历指定目录并统计各种类型的文件数量，包括普通文件、目录文件等。通过递归方式深入子目录进行详细统计，并将结果输出。

4.20.cpp

#include <iostream>
#include <sys/stat.h>
#include <string.h>
#include <stdexcept>
#include <memory>
#include <dirent.h>

using namespace std;

class Dir
{
public:
    string dirname;
    int nreg;
    int nblk;
    int nchr;
    int ndir;
    int nslink;
    int nfifo;
    int nsock;
    int ntotal;
private:
    struct stat* statbuf;
    DIR *dp;
    struct dirent *dirp;
private:
    void isFile()
    {
    switch (statbuf->st_mode & S_IFMT)
    {
        case S_IFREG:
        ++nreg; break;
        case S_IFBLK:
        ++nblk; break;
        case S_IFCHR:
        ++nchr; break;
        case S_IFLNK:
        ++nslink; break;
        case S_IFIFO:
        ++nfifo; break;
        case S_IFSOCK:
        ++nsock; break;
        default:
        throw out_of_range("未知类型文件");
    }
    }
    void isDir()
    {
    ++ndir;
    if ((dp = opendir(dirname.c_str())) == NULL)
        throw out_of_range("打开目录失败");
    while ((dirp = readdir(dp)) != NULL)
    {
        if (strcmp(dirp->d_name,".") == 0 || strcmp(dirp->d_name,"..") ==0)
        continue;
       string ndirname = dirname + "/" + dirp->d_name;
        cout << ndirname  << endl;
        unique_ptr<Dir> dir(new Dir(ndirname));
        nreg += dir->nreg;
        nchr += dir->nchr;
        nblk += dir->nblk;
        nslink += dir->nslink;
        ndir += dir->ndir;
        nfifo += dir->nfifo;
        nsock += dir->nsock;
        ntotal += dir->ntotal;
    }
    }
public:
    Dir(const string& s):dirname(s),nreg(0),nblk(0),ndir(0),nfifo(0),nchr(0)
             ,nsock(0),nslink(0),ntotal(0),statbuf(new struct stat)
    {

    if (lstat(dirname.c_str(),statbuf) < 0)
        throw out_of_range("lstat error\n");
    if (S_ISDIR(statbuf->st_mode) == 0)
        isFile();
    else if (S_ISLNK(statbuf->st_mode) != 0)
        ++nslink;
    else
        isDir();
    ntotal = nreg + nblk + ndir + nfifo + nchr + nsock + nslink;
    }
    void display()
    {
    cout << "********************************************" << endl;
    cout << "普通文件总量:         " << nreg << endl;
    cout << "字符特殊文件总量:     " << nchr << endl;
    cout << "块特殊文件总量:       " << nblk << endl;
    cout << "符号链接总量:           " << nslink << endl;
    cout << "套接字文件总量:       " << nsock << endl;
    cout << "目录文件总量:           " << ndir << endl;
    cout << "管道文件总量:         " << nfifo << endl;
    cout << "文件总量:         " << ntotal << endl;
    cout << "********************************************" << endl;
    }
    ~Dir()
    {
    if (S_ISDIR(statbuf->st_mode) != 0)
       closedir(dp);
    if (statbuf != NULL)
        delete statbuf;
    }
};
int main(int argc,char* argv[])
{
    try
    {
    if (argc != 2)
        throw domain_error("add <filename>");
    Dir dir(argv[1]);
    dir.display();
    }
    catch(const exception& e)
    {
    cout << e.what() << endl;
    }
}

运行:

这里写图片描述