C++ 如果目录不存在，则创建一个目录
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Create a directory if it doesn't exist
提问by pourjour
In my app I want to copy a file to the other hard disk so this is my code:
在我的应用程序中，我想将一个文件复制到另一个硬盘，所以这是我的代码：
#include <windows.h>
using namespace std;
int main(int argc, char* argv[] )
{
string Input = "C:\Emploi NAm.docx";
string CopiedFile = "Emploi NAm.docx";
string OutputFolder = "D:\test";
CopyFile(Input.c_str(), string(OutputFolder+CopiedFile).c_str(), TRUE);
return 0;
}
so after executing this, it shows me in the D:HDD a file testEmploi NAm.docxbut I want him to create the test folder if it doesn't exist.
因此，执行此操作后，它会在D:HDD 中向我显示一个文件，testEmploi NAm.docx但我希望他创建测试文件夹（如果该文件夹不存在）。
I want to do that without using the Boost library.
我想在不使用 Boost 库的情况下做到这一点。
回答by hmjd
Use the WINAPI CreateDirectory()function to create a folder.
使用 WINAPICreateDirectory()函数创建文件夹。
You can use this function without checking if the directory already exists as it will fail but GetLastError()will return ERROR_ALREADY_EXISTS:
您可以在不检查目录是否已存在的情况下使用此函数，因为它会失败但GetLastError()会返回ERROR_ALREADY_EXISTS：
if (CreateDirectory(OutputFolder.c_str(), NULL) ||
ERROR_ALREADY_EXISTS == GetLastError())
{
// CopyFile(...)
}
else
{
// Failed to create directory.
}
The code for constructing the target file is incorrect:
构建目标文件的代码不正确：
string(OutputFolder+CopiedFile).c_str()
this would produce "D:\testEmploi Nam.docx": there is a missing path separator between the directory and the filename. Example fix:
这会产生"D:\testEmploi Nam.docx"：目录和文件名之间缺少路径分隔符。示例修复：
string(OutputFolder+"\"+CopiedFile).c_str()
回答by Chris Rayner
Probably the easiest and most efficient way is to use boost and the boost::filesystem functions. This way you can build a directory simply and ensure that it is platform independent.
可能最简单和最有效的方法是使用 boost 和 boost::filesystem 函数。通过这种方式，您可以简单地构建目录并确保它与平台无关。
const char* path = _filePath.c_str();
boost::filesystem::path dir(path);
if(boost::filesystem::create_directory(dir))
{
std::cerr<< "Directory Created: "<<_filePath<<std::endl;
}
回答by Vertexwahn
#include <experimental/filesystem> // or #include <filesystem>
namespace fs = std::experimental::filesystem;
if (!fs::is_directory("src") || !fs::exists("src")) { // Check if src folder exists
fs::create_directory("src"); // create src folder
}
回答by Fivee Arch
Here is the simple way to create a folder.......
下面是创建文件夹的简单方法......
#include <windows.h>
#include <stdio.h>
void CreateFolder(const char * path)
{
if(!CreateDirectory(path ,NULL))
{
return;
}
}
CreateFolder("C:\folder_name\")
This above code works well for me.
上面的代码对我来说效果很好。
回答by jiasli
_mkdirwill also do the job.
_mkdir也会做这份工作。
_mkdir("D:\test");
回答by saurabheights
OpenCV Specific
OpenCV 特定
Opencv supports filesystem, probably through its dependency Boost.
Opencv 支持文件系统，可能是通过它的依赖 Boost。
#include <opencv2/core/utils/filesystem.hpp>
cv::utils::fs::createDirectory(outputDir);
回答by Noa Yehezkel
You can use cstdlib
您可以使用cstdlib
Although- http://www.cplusplus.com/articles/j3wTURfi/
虽然 - http://www.cplusplus.com/articles/j3wTURfi/
#include <cstdlib>
const int dir= system("mkdir -p foo");
if (dir< 0)
{
return;
}
you can also check if the directory exists already by using
您还可以使用以下命令检查目录是否已存在
#include <dirent.h>
回答by DotNetUser
Use CreateDirectory (char *DirName, SECURITY_ATTRIBUTES Attribs);
用 CreateDirectory (char *DirName, SECURITY_ATTRIBUTES Attribs);
If the function succeeds it returns non-zero otherwise NULL.
如果函数成功，则返回非零，否则返回NULL。
