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i have created CLR winforms(.net framework) c++ project, there's two buttons SelectImageBtn and EnhanceBn.
i want to select the folder where the blur images are stored by clicking SelectImageBtn and want to sharp and enhance all the blur images and save the new folder of enhanced images.
i have tried something but getting errors and i don't know weather it will work or not !!

getting error: E0725 name must be a namespace name, on line :
using namespace filesystem;

and error : E0276 name followed by '::' must be a class or namespace name, on line :
for (const auto& file : filesystem::directory_iterator(folderPath))

note : i am newbie to C++, so don't know much about c++
look out the code is i am going right or wrong ? suggestions will be appreciated and thanks in advance!!!

What I have tried:

#include <filesystem>
#include <exception>
#include <opencv2/opencv.hpp>
#include <msclr/marshal_cppstd.h>
#include <string>

namespace ImageEnhancer {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;
	using namespace System::IO;
	using namespace System::Drawing::Imaging;
	using namespace cv;
	using namespace std;
	using namespace filesystem;

	/// <summary>
	/// Summary for MyForm
	/// </summary>
	public ref class MyForm : public System::Windows::Forms::Form
			//TODO: Add the constructor code here

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
			if (components)
				delete components;
	FolderBrowserDialog^ dialog = gcnew FolderBrowserDialog;
	private: System::Windows::Forms::Button^ SelectImageBtn;
	private: System::Windows::Forms::Button^ EnhanceBn;




		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container^ components;

#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		void InitializeComponent(void)
			this->SelectImageBtn = (gcnew System::Windows::Forms::Button());
			this->EnhanceBn = (gcnew System::Windows::Forms::Button());
			// SelectImageBtn
			this->SelectImageBtn->Location = System::Drawing::Point(134, 152);
			this->SelectImageBtn->Name = L"SelectImageBtn";
			this->SelectImageBtn->Size = System::Drawing::Size(75, 45);
			this->SelectImageBtn->TabIndex = 0;
			this->SelectImageBtn->Text = L"Select";
			this->SelectImageBtn->UseVisualStyleBackColor = true;
			this->SelectImageBtn->Click += gcnew System::EventHandler(this, &MyForm::SelectImageBtn_Click);
			// EnhanceBn
			this->EnhanceBn->Location = System::Drawing::Point(277, 152);
			this->EnhanceBn->Name = L"EnhanceBn";
			this->EnhanceBn->Size = System::Drawing::Size(75, 45);
			this->EnhanceBn->TabIndex = 1;
			this->EnhanceBn->Text = L"Enhance";
			this->EnhanceBn->UseVisualStyleBackColor = true;
			this->EnhanceBn->Click += gcnew System::EventHandler(this, &MyForm::EnhanceBn_Click);
			// MyForm
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(522, 393);
			this->Name = L"MyForm";
			this->Text = L"ImageEnhancer";

#pragma endregion

		// Function to enhance a single image
		void enhanceImage(Mat& inputImage, Mat& outputImage)
			// Code to enhance image using OpenCV functions goes here
			// For example, sharpening the image:
			Mat kernel = (Mat_<float>(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
			filter2D(inputImage, outputImage, -1, kernel);

	private: System::Void SelectImageBtn_Click(System::Object^ sender, System::EventArgs^ e)
			// Create FolderBrowserDialog to select folder

			// Store selected folder path
			string folderPath = msclr::interop::marshal_as<string>(dialog->SelectedPath);

		catch (const std::exception& exx)
	private: System::Void EnhanceBn_Click(System::Object^ sender, System::EventArgs^ e)
		string folderPath = msclr::interop::marshal_as<string>(dialog->SelectedPath);
		// Loop through all files in the selected folder
		for (const auto& file : filesystem::directory_iterator(folderPath))
			// Load image using OpenCV
			Mat inputImage = imread(file.path().string());

			// Create output image
			Mat outputImage;

			// Enhance image
			enhanceImage(inputImage, outputImage);

			// Save enhanced image to new folder
			string outputPath = "output/" + file.path().filename().string();
			imwrite(outputPath, outputImage);


Updated 12-Mar-23 2:40am
Mohamed Alaa Mar2023 11-Mar-23 1:08am    
Given two strings S and T. Print 2 lines that contain the following in the same order:

Print the length of S and T separated by space.
Print a new string that contains S and T separated by a space.
For more clarification see the example below.

The first line contains a string S (1 ≤ |S| ≤ 103) where |S| is the length of S.

The second line contains a string T (1 ≤ |T| ≤ 103) where |T| is the length of T.

Print the answer required above.
Mohamed Alaa Mar2023 11-Mar-23 1:09am    
I want to know the solution to the question
Dave Kreskowiak 11-Mar-23 12:42pm    
The only code you get is the code YOU write. Nobody is going to do your homework for you.
Dave Kreskowiak 12-Mar-23 11:45am    
You posted your "question" as a comment on a completely unrelated topic. Your question is going to be ignored.

The /std option is used to control version-specific standard features of the ISO C or C++ programming language in a compiler.
However, according to your sample code you are using C++/CLI. This is a variant of the ISO C++ programming language developed by Microsoft.

You don't seem to be clear about the difference.
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okay i found the solutions for getting errors
i was using
ISO C++14 Standard (/std:c++14)
instead of upgraded version
ISO C++17 Standard (/std:c++17)

i fix the problem following steps

To switch to C++17 or later, you need to modify the compiler options. Here are the steps to switch to C++17 in Visual Studio:

-> Right-click on your project in the Solution Explorer and select "Properties".

->Select "C/C++" and then "Language" from the left-hand menu.

->In the "C++ Language Standard" drop-down, select "ISO C++17 Standard (/std:c++17)".

->Click "Apply" and then "OK" to save your changes.

If you are using a different compiler, you will need to consult the documentation for that compiler to find out how to switch to C++17.
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