(C++) Checking Specific Folder Name by 一半人生
Created the Friday 19 May 2023. Updated 11 months ago.
Description:
This C++ code provides three different functions to check whether a given directory exists in a Windows file system. The functions IsDirectory, IsDirectory1, and IsDirectory2 each use different methods to verify the existence of the directory. IsDirectory uses the CRT _access function, IsDirectory1 uses the WinAPI CreateFileA function with the OPEN_EXISTING flag and FILE_FLAG_BACKUP_SEMANTICS attribute to check if a directory handle can be created, and IsDirectory2 uses the CreateDirectoryA function to attempt to create the directory and then checks for an ERROR_ALREADY_EXISTS error. The main function then tests these three methods on a directory named "C:\Cuckoo" and outputs whether each method successfully detected the directory.
Code
#include <Windows.h>
#include <iostream>
#include <io.h>
// win api
const bool IsDirectory2(std::string& strDirName) {
const auto iCode = CreateDirectoryA(strDirName.c_str(), NULL);
if (ERROR_ALREADY_EXISTS == GetLastError())
return true;
if (iCode)
RemoveDirectoryA(strDirName.c_str());
return false;
}
// win api
const bool IsDirectory1(std::string& strDirName) {
const HANDLE hFile = CreateFileA(
strDirName.c_str(),
GENERIC_READ,
0,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
NULL);
if (!hFile || (INVALID_HANDLE_VALUE == hFile))
return false;
if(hFile)
CloseHandle(hFile);
return true;
}
// crt
const bool IsDirectory(std::string& strDirName) {
if (0 == _access(strDirName.c_str(), 0))
return true;
return false;
}
int main()
{
std::string strDirName = "C:\\Cuckoo";
if (IsDirectory(strDirName)) {
std::cout << "Ture: " << strDirName.c_str() << std::endl;
}
else {
std::cout << "Flase: " << strDirName.c_str() << std::endl;
}
if (IsDirectory1(strDirName)) {
std::cout << "Ture: " << strDirName.c_str() << std::endl;
}
else {
std::cout << "Flase: " << strDirName.c_str() << std::endl;
}
if (IsDirectory2(strDirName)) {
std::cout << "Ture: " << strDirName.c_str() << std::endl;
}
else {
std::cout << "Flase: " << strDirName.c_str() << std::endl;
}
return 0;
}