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定义一个类CheckPath，它由两个public方法组成：

1） checkPath：检查传入的字符串指定的路径是否存在，存在返回true，否则返回false。

2） createFilePath：根据传入的字符串指定的路径，创建由 pathDepth指定的路径，例如：如果传入字符串为/home/user/aa/bb，如果指定的pathDepath为0，则不创建这个路径，如果pathDepath为1，则创建从/开始创建所有路径，如果pathDepath为2，则创建从/home开始创建所有路径。

class CheckPath{
public:bool checkPath(std::string &filePath);bool createFilePath(const char * path, int pathDepth);
};

checkpath.cpp源文件： 

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <iostream>
#include <sstream>
#include <fstream>#define MAX_FILENAME_LEN        256class CheckPath{
public:bool checkPath(std::string &filePath);bool createFilePath(const char * path, int pathDepth);
};/* 测试指定目录是否存在 */
bool CheckPath::checkPath(std::string &filePath)
{char lastChar;struct stat buff;int istat;int isDir = 0;bool pathExists = false;int len = filePath.size();if (len == 0) return false;lastChar = filePath[len - 1];if (lastChar == '/'){filePath.resize(len - 1);}istat = stat(filePath.c_str(), &buff);if (!istat) isDir = (S_IFDIR & buff.st_mode);if (!istat && isDir){pathExists = true;}filePath.append("/");return pathExists;
}/* 安pathDepath指定深度开始创建指定的目录 */
bool CheckPath::createFilePath(const char * path, int pathDepth)
{bool    result = true;char    * parts[MAX_FILENAME_LEN];int     num_parts;char    directory[MAX_FILENAME_LEN];char    nextDir[MAX_FILENAME_LEN];char    * saveptr;int     i = 0;/* donot create path */if (pathDepth == 0) return result;while ((path[i] == '/') && i < MAX_FILENAME_LEN){nextDir[i] = path[i];i++;}nextDir[i] = 0;printf("nextDir: %s\n", nextDir);strcpy(directory, &path[i]);printf("Directory: %s\n", directory);num_parts = 0;parts[num_parts] = strtok_r(directory, "\\/", &saveptr);while (parts[num_parts] != NULL){parts[++num_parts] = strtok_r(NULL, "\\/", &saveptr);}//        for (i = 0; i < num_parts; i++){
//                printf("%d: %s\n", i+1, parts[i]);//}if (pathDepth < 0){pathDepth = num_parts + pathDepth;if (pathDepth < 1) pathDepth = 1;}for (i = 0; i < num_parts && result != false; i++){strcat(nextDir, parts[i]);if (i >= pathDepth){//                printf("depath = %d,create path %s\n",i, nextDir);if (mkdir(nextDir, 0777) != 0 && errno != EEXIST){result = false;}}strcat(nextDir, "/");}return result;
}/* 测试主程序 */
int main(int argc, char ** argv)
{if (argc != 2){fprintf(stderr, "Usage: %s pathname\n", argv[0]);return -1;}std::string filePath = argv[1];std::cout << "Check File Path : " << filePath << " exists?" << std::endl;;CheckPath * pcp = new CheckPath();/* Test file path exists or not */std::cout << "*****************************************"<<std::endl;std::cout << "Test Function 1 checkPath:" << std::endl;if (pcp->checkPath(filePath)){std::cout << "FilePath:" << filePath <<" does exist" << std::endl;}else{std::cout << "FilePath:" << filePath << " does not exist" << std::endl;}std::cout << "*****************************************"<<std::endl<<std::endl;;std::cout << "*****************************************"<<std::endl;std::cout << "Test Function 2 createFilePath:" << std::endl;std::cout << "Please enter a path to create:";std::cin >> filePath;std::cout << "The path to create :" << filePath << std::endl;int depth;std::cout << "Please enter the create depth:";std::cin >> depth;printf("Depth: %d\n", depth);if (pcp->createFilePath(filePath.c_str(), depth)){std::cout << "Create the "  << depth << " depth of file path " << filePath << std::endl;}else{std::cout << "can not create file path " << filePath << std::endl;}std::cout << "*****************************************"<<std::endl;delete pcp;return 0;
}

编译以上代码，观察结果：

orangepi@orangepi5:~/C_program$ ./checkpath aa
Check File Path : aa exists?
*****************************************
Test Function 1 checkPath:
FilePath:aa/ does exist
**********************************************************************************
Test Function 2 createFilePath:
Please enter a path to create:/home/orangepi/C_program/aa/bb
The path to create :/home/orangepi/C_program/aa/bb
Please enter the create depth:3
Depth: 3
nextDir: /
Directory: home/orangepi/C_program/aa/bb
Create the 3 depth of file path /home/orangepi/C_program/aa/bb
*****************************************
orangepi@orangepi5:~/C_program$ ls aa/
bb

检查当前目录下aa目录时存在的，并且在aa目录下创建了一个bb目录。