????????之前在?https://blog.csdn.net/fengbingchun/article/details/51474728?給出了在Windows遍歷指定文件夾的C++實現(xiàn)，這里給出在Linux下遍歷目錄的實現(xiàn)，Windows和Linux下的實現(xiàn)都是參考了OpenCV 2.x中的實現(xiàn)，OpenCV中的用法可參考https://blog.csdn.net/fengbingchun/article/details/42435901?，OpenCV 3.x中將這一部分移除掉了。

????? ? 目前不論是windows、linux還是opencv本身的實現(xiàn)，在目錄中嵌套的目錄只能遍歷一層。

????? ? 測試代碼如下：

#include <dirent.h>
#include <string.h>
#include <iostream>
#include <vector>
#include <string>namespace {void Usage(const char* exe)
{fprintf(stderr, "input params error, run this exe as following command line:\n");fprintf(stderr, "\t%s arg1 arg2 arg3\n", exe);fprintf(stderr, "\targ1: specify the directory to traverse\n");fprintf(stderr, "\targ2: type:\n""\t\t0: tarverse all files and all directories in directory;\n""\t\t1: only tarverse all files, don't include directories in directory;\n""\t\t2: only tarverse all directories, don't include files in directory.\n");fprintf(stderr, "\targ3: optional, filter, default is *, which is don't filter. \n");fprintf(stderr, "for example(support relative path), only traverse jpg image:\n");fprintf(stderr, "\t%s ./images 0 .jpg\n", exe);fprintf(stderr, "##### test fail #####\n");
}// 遍歷指定文件夾下的所有文件，不包括指定文件夾內(nèi)的文件夾
std::vector<std::string> GetListFiles(const std::string& path, const std::string& exten = "*")
{std::vector<std::string> list;list.clear();DIR* dp = nullptr;struct dirent* dirp = nullptr;if ((dp = opendir(path.c_str())) == nullptr) {return list;}while ((dirp = readdir(dp)) != nullptr) {if (dirp->d_type == DT_REG) {if (exten.compare("*") == 0)list.emplace_back(static_cast<std::string>(dirp->d_name));elseif (std::string(dirp->d_name).find(exten) != std::string::npos)list.emplace_back(static_cast<std::string>(dirp->d_name));}}closedir(dp);return list;
}// 遍歷指定文件夾下的所有文件夾，不包括指定文件夾下的文件
std::vector<std::string> GetListFolders(const std::string& path, const std::string& exten = "*")
{std::vector<std::string> list;list.clear();DIR* dp = nullptr;struct dirent* dirp = nullptr;if ((dp = opendir(path.c_str())) == nullptr) {return list;}while ((dirp = readdir(dp)) != nullptr) {if (dirp->d_type == DT_DIR && strcmp(dirp->d_name, ".") != 0 && strcmp(dirp->d_name, "..") != 0) {if (exten.compare("*") == 0)list.emplace_back(static_cast<std::string>(dirp->d_name));elseif (std::string(dirp->d_name).find(exten) != std::string::npos)list.emplace_back(static_cast<std::string>(dirp->d_name));}}closedir(dp);return list;
}// 遍歷指定文件夾下的所有文件，包括指定文件夾內(nèi)的文件夾
std::vector<std::string> GetListFilesR(const std::string& path, const std::string& exten = "*")
{std::vector<std::string> list = GetListFiles(path, exten);std::vector<std::string> dirs = GetListFolders(path, exten);for (auto it = dirs.cbegin(); it != dirs.cend(); ++it) {std::vector<std::string> cl = GetListFiles(*it, exten);for (auto file : cl) {list.emplace_back(*it + "/" + file);}}return list;
}} // namespaceint main(int argc, char* argv[])
{if (argc < 3 || argc > 4) {Usage(argv[0]);return -1;}int type = atoi(argv[2]);std::string exten = "*";if (argc == 4) exten = std::string(argv[3]);std::vector<std::string> vec;if (type == 0) vec = GetListFilesR(std::string(argv[1]), exten);else if (type == 1) vec = GetListFiles(std::string(argv[1]), exten);else if (type == 2) vec = GetListFolders(std::string(argv[1]), exten);else { Usage(argv[0]); return -1;}fprintf(stdout, "traverse result: files count: %d\n", vec.size());for (auto& file : vec) {fprintf(stderr, "\t%s\n", file.c_str());}fprintf(stdout, "===== test success =====\n");
}

????? ? CMakeLists.txt文件內(nèi)容如下：

PROJECT(samples_cplusplus)
CMAKE_MINIMUM_REQUIRED(VERSION 3.0)# 支持C++11
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -Wall -O2 -std=c11")
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}  -g -Wall -O2 -std=c++11")INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR})FILE(GLOB samples ${PROJECT_SOURCE_DIR}/*.cpp)FOREACH (sample ${samples})STRING(REGEX MATCH "[^/]+$" sample_file ${sample})STRING(REPLACE ".cpp" "" sample_basename ${sample_file})ADD_EXECUTABLE(test_${sample_basename} ${sample})TARGET_LINK_LIBRARIES(test_${sample_basename} pthread)
ENDFOREACH()

????? ? build.sh腳本內(nèi)容如下：

#! /bin/bashecho "Note: new create build directory, and executable file in build"
echo ${PWD}
mkdir -p build
cd build
cmake ..
make

????? ? 執(zhí)行過程：將終端定位到Linux_Code_Test/Samples_cplusplus目錄下，執(zhí)行：./build.sh，然后進入到build目錄下，執(zhí)行生成的執(zhí)行文件即可。

????? ? 測試結(jié)果如下：

????? ? GitHub：?https://github.com/fengbingchun/Linux_Code_Test?

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