C++ || How To Get The File Path, File Name & File Extension From A Path Using C++

December 05, 2020 admin No comments

The following is a module with functions which demonstrates how to parse a file path, file name and file extension from a path using C++.

1. Get File Path

The example below demonstrates the use of ‘Utils::getFilePath‘ to parse and get the file path from a path.





		
		
			1. Get File Path
			
C++
			
			// Get File Path

// Declare path
std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";

// Get the file path
auto filePath = Utils::getFilePath(path);

std::cout << "Path: " << path << std::endl;
std::cout << "File Path: " << filePath;

// expected output:
/*
    Path: C:\Users\Name\Desktop\20171216_155433.jpg
    File Path: C:\Users\Name\Desktop
*/
			
				
					
				
					1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
				
						// Get File Path
 
// Declare path
std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";
 
// Get the file path
auto filePath = Utils::getFilePath(path);
 
std::cout << "Path: " << path << std::endl;
std::cout << "File Path: " << filePath;
 
// expected output:
/*
    Path: C:\Users\Name\Desktop\20171216_155433.jpg
    File Path: C:\Users\Name\Desktop
*/

2. Get File Name

The example below demonstrates the use of ‘Utils::getFileName‘ to parse and get the file name from a path.





		
		
			2. Get File Name
			
C++
			
			// Get File Name

// Declare path
std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";

// Get the file name
auto fileName = Utils::getFileName(path);

std::cout << "Path: " << path << std::endl;
std::cout << "File Name: " << fileName;

// expected output:
/*
    Path: C:\Users\Name\Desktop\20171216_155433.jpg
    File Name: 20171216_155433.jpg
*/
			
				
					
				
					1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
				
						// Get File Name
 
// Declare path
std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";
 
// Get the file name
auto fileName = Utils::getFileName(path);
 
std::cout << "Path: " << path << std::endl;
std::cout << "File Name: " << fileName;
 
// expected output:
/*
    Path: C:\Users\Name\Desktop\20171216_155433.jpg
    File Name: 20171216_155433.jpg
*/

3. Get File Name Extension

The example below demonstrates the use of ‘Utils::getFileExtension‘ to parse and get the file extension from a path.





		
		
			3. Get File Name Extension
			
C++
			
			// Get File Name Extension

// Declare path
std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";

// Get the file extension
auto extension = Utils::getFileExtension(path);

std::cout << "Path: " << path << std::endl;
std::cout << "File Extension: " << extension;

// expected output:
/*
    Path: C:\Users\Name\Desktop\20171216_155433.jpg
    File Extension: jpg
*/
			
				
					
				
					1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
				
						// Get File Name Extension
 
// Declare path
std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";
 
// Get the file extension
auto extension = Utils::getFileExtension(path);
 
std::cout << "Path: " << path << std::endl;
std::cout << "File Extension: " << extension;
 
// expected output:
/*
    Path: C:\Users\Name\Desktop\20171216_155433.jpg
    File Extension: jpg
*/

4. Utils Namespace

The following is the Utils Namespace. Include this in your project to start using!





		
		
			Utils Namespace
			
C++
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 5, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Utils.h
//    Description: Handles general utility functions
// ============================================================================
#pragma once
#include <string>
#include <algorithm>
#include <cctype>

namespace Utils {
    /**
    * FUNCTION: getFilePath 
    * USE: Returns the path from a given file path
    * @param path: The path of the file
    * @return: The path from the given file path
    */
    std::string getFilePath(const std::string& path) {
        auto pathEnd = path.find_last_of("/\\");
        auto pathName = pathEnd == std::string::npos ? path : path.substr(0, pathEnd);
        return pathName;
    }

    /**
    * FUNCTION: getFileName 
    * USE: Returns the file name from a given file path
    * @param path: The path of the file
    * @return: The file name from the given file path
    */
    std::string getFileName(const std::string& path) {
        auto fileNameStart = path.find_last_of("/\\");
        auto fileName = fileNameStart == std::string::npos ? path : path.substr(fileNameStart + 1);
        return fileName;
    }

    /**
    * FUNCTION: getFileExtension 
    * USE: Returns the file extension from a given file path
    * @param path: The path of the file
    * @return: The file extension from the given file path
    */
    std::string getFileExtension(const std::string& path) {
        auto fileName = getFileName(path);
        auto extStart = fileName.find_last_of('.');
        auto ext = extStart == std::string::npos ? "" : fileName.substr(extStart + 1);
        std::transform(ext.begin(), ext.end(), ext.begin(), [](unsigned char c) { 
            return static_cast<unsigned char>(std::tolower(c)); 
        });
        return ext;
    }
}// http://programmingnotes.org/
			
				
					
				
					1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
				
						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 5, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Utils.h
//    Description: Handles general utility functions
// ============================================================================
#pragma once
#include <string>
#include <algorithm>
#include <cctype>
 
namespace Utils {
    /**
    * FUNCTION: getFilePath 
    * USE: Returns the path from a given file path
    * @param path: The path of the file
    * @return: The path from the given file path
    */
    std::string getFilePath(const std::string& path) {
        auto pathEnd = path.find_last_of("/\\");
        auto pathName = pathEnd == std::string::npos ? path : path.substr(0, pathEnd);
        return pathName;
    }
 
    /**
    * FUNCTION: getFileName 
    * USE: Returns the file name from a given file path
    * @param path: The path of the file
    * @return: The file name from the given file path
    */
    std::string getFileName(const std::string& path) {
        auto fileNameStart = path.find_last_of("/\\");
        auto fileName = fileNameStart == std::string::npos ? path : path.substr(fileNameStart + 1);
        return fileName;
    }
 
    /**
    * FUNCTION: getFileExtension 
    * USE: Returns the file extension from a given file path
    * @param path: The path of the file
    * @return: The file extension from the given file path
    */
    std::string getFileExtension(const std::string& path) {
        auto fileName = getFileName(path);
        auto extStart = fileName.find_last_of('.');
        auto ext = extStart == std::string::npos ? "" : fileName.substr(extStart + 1);
        std::transform(ext.begin(), ext.end(), ext.begin(), [](unsigned char c) { 
            return static_cast<unsigned char>(std::tolower(c)); 
        });
        return ext;
    }
}// http://programmingnotes.org/

5. More Examples

Below are more examples demonstrating the use of the ‘Utils‘ Namespace. Don’t forget to include the module when running the examples!





		
		
			More Examples
			
C++
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 5, 2020
//    Taken From: http://programmingnotes.org/
//    File:  program.cpp
//    Description: The following demonstrates the use of the Utils Namespace
// ============================================================================
#include <iostream>
#include <string>
#include <exception>
#include "Utils.h"

void display(const std::string& message);

int main() {
    try {
        // Declare path
        std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";

        // Get the file path
        auto filePath = Utils::getFilePath(path);

        display("Path: " + path + ", File Path: " + filePath);
        
        // Get the filename
        auto fileName = Utils::getFileName(path);

        display("Path: " + path + ", File Name: " + fileName);

        // Get the file extension
        auto extension = Utils::getFileExtension(path);

        display("Path: " + path + ", File Extension: " + extension);

    } catch (std::exception& e) {
        display("\nAn error occurred: " + std::string(e.what()));
    }

    std::cin.get();
    return 0;
}

void display(const std::string& message) {
    std::cout << message << std::endl;
}// http://programmingnotes.org/
			
				
					
				
					1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
				
						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Dec 5, 2020
//    Taken From: http://programmingnotes.org/
//    File:  program.cpp
//    Description: The following demonstrates the use of the Utils Namespace
// ============================================================================
#include <iostream>
#include <string>
#include <exception>
#include "Utils.h"
 
void display(const std::string& message);
 
int main() {
    try {
        // Declare path
        std::string path = "C:\\Users\\Name\\Desktop\\20171216_155433.jpg";
 
        // Get the file path
        auto filePath = Utils::getFilePath(path);
 
        display("Path: " + path + ", File Path: " + filePath);
        
        // Get the filename
        auto fileName = Utils::getFileName(path);
 
        display("Path: " + path + ", File Name: " + fileName);
 
        // Get the file extension
        auto extension = Utils::getFileExtension(path);
 
        display("Path: " + path + ", File Extension: " + extension);
 
    } catch (std::exception& e) {
        display("\nAn error occurred: " + std::string(e.what()));
    }
 
    std::cin.get();
    return 0;
}
 
void display(const std::string& message) {
    std::cout << message << std::endl;
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Was this article helpful?

👍 YesNo

Posted in: Basic, C++ Tags: c++

C++ || How To Get The File Path, File Name & File Extension From A Path Using C++

Related

Leave a ReplyCancel reply

Search

Compile Your Code Now

Translate Page

Popular Pages

Recent

Archives

Categories