1.使用C++标准库创建（适用于141工具集）

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#include <direct.h>
#include <iostream>
#include <filesystem>
#include <fstream>

int main() {
    std::error_code ercode;

    //获取当前路径
	std::string curexe_path = _getcwd(NULL, 0);

    //判断文件夹是否存在，不存在则创建
    curexe_path = curexe_path + string("\\testlogcpp");
	if (std::experimental::filesystem::exists(curexe_path, ecode) == false)
	{
		std::experimental::filesystem::create_directories(curexe_path, ecode);
	}

    //判断文件是否存在，不存在则创建
	std::string file_path = curexe_path + "\\example.txt";
    if (std::experimental::filesystem::exists(file_path)) {
        std::cout << "File exists.\n";
    } else {
        std::cout << "File does not exist. Creating file...\n";
        std::ofstream outfile(file_path);
        outfile << "This is a new file.\n";
        outfile.close();
        std::cout << "File created.\n";
    }
    return 0;
}

注意：此种方法选择142工具集时会报错，因为在142中已经把filesystem::exists()从标准库中移除了。

2.使用windows标准库创建(适用于141和142工具集)

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#include <fstream>
#include <direct.h>
#include <iostream>
#include <Windows.h>

//判断文件夹是否存在
bool isDirExist(const std::string& path) {
	DWORD dwAttrib = GetFileAttributesA(path.c_str());
	if (dwAttrib != INVALID_FILE_ATTRIBUTES && (dwAttrib & FILE_ATTRIBUTE_DIRECTORY)) {
		return true;
	}
	return false;
}

//创建文件夹
bool createDir(const std::string& path) {
	if (CreateDirectoryA(path.c_str(), NULL)) {
		return true;
	}
	return false;
}


int main()
{
    //获取当前路径
	std::string curexe_path = _getcwd(NULL, 0);
	std::error_code ecode1;
	std::string logpath = curexe_path + std::string("\\cpplog");
	
    //若不存在则创建
    if (!isDirExist(logpath))
		createDir(logpath);
	
	return 0;
}