如何使一个文件夹/目录 [英] How to make a folder/directory

问题描述

如何使用c ++创建目录/文件夹。我试图使用mkdir（）没有成功。我想编写一个程序，cin是一个变量，然后使用这个变量来创建子目录和文件。
我当前的代码。它说的mkdir（）中的+运算符说错误没有操作数

  char newFolder [20] 
 
 cout<< 输入新项目的名称，不含空格：\\\
; 
 cin>>新文件夹; 
 string files [] = {index.php}; 
 string dir [] = {/ images，/ includes，/ includes / js，/ contact，about}; 
 
 for（int i = 0; i <= 5; i ++）{
 mkdir（newFolder + dir [i]）; 
 ofstream write（index / index.php）; 
 write<< <？php \\\
 \\\
 \\\
？>; 
 write.close（）; 
} 
  

解决方案

$ c> #include< string> ， std :: string

表达式 newFolder + dir [i] 的结果是 std :: string ， mkdir（）需要一个 const char * 。更改为：

  mkdir（（newFolder + dir [i]）c_str 
  

检查 mkdir（）的返回值以确保成功，如果不使用 strerror（errno）来获取失败的原因。

数组的结尾 dir ：

  for（int i = 0; i <= 5; i ++）{
 mkdir（newFolder + dir [i]）; 
  

5 $ c> dir ，所以合法索引从 0 到 4 。更改为：

  for（int i = 0; i <5; i ++）{
 mkdir（newFolder + dir [一世]）; 
  

使用 std :: string c $ c> newFolder ，而不是 char [20] ：

  std :: string newFolder; 
  

然后你不必担心超过19个字符

How do I make a directory/folder with c++. I've tried to use the mkdir() without success. I want to write a program that cin's a variable and then uses this variable to create sub-directory's and files with in those. my current code. It says the + operator in the mkdir() says error no operand

char newFolder[20];

cout << "Enter name of new project without spaces:\n";
cin >> newFolder;
string files[] = {"index.php"};
string dir[] = {"/images","/includes","/includes/js","/contact","about"};

for (int i = 0; i<=5; i++){
mkdir(newFolder + dir[i]);
ofstream write ("index/index.php");
write << "<?php \n \n \n ?>";
write.close();
}

解决方案

You need to #include <string>, the std::string operators are defined in that header.

The result of the expression newFolder + dir[i] is a std::string, and mkdir() takes a const char*. Change to:

mkdir((newFolder + dir[i]).c_str());

Check the return value of mkdir() to ensure success, if not use strerror(errno) to obtain the reason for failure.

This accesses beyond the end of the array dir:

for (int i = 0; i<=5; i++){
    mkdir(newFolder + dir[i]);

there are 5 elements in dir, so legal indexes are from 0 to 4. Change to:

for (int i = 0; i<5; i++){
    mkdir(newFolder + dir[i]);

Usestd::string for newFolder, rather than char[20]:

std::string newFolder;

Then you have no concern over a folder of more than 19 characters (1 required for null terminator) being entered.

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