Visual C++ 2008 file reading help

[ATMventure]

Hi I am trying to create a simple file reading program in Visual C++ 2008 using fstream. When I compile it it gives me a dozzen errors to do with the fstream class. I think that the class is not being included properly.

Here is my code

#pragma once
#include <fstream>
#include <iostream>
#include <cstdio>
#include <string>
#include "stdafx.h"

namespace Cttest007 {



	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;

	/// <summary>
	/// Summary for Form1
	///
	/// WARNING: If you change the name of this class, you will need to change the
	///          'Resource File Name' property for the managed resource compiler tool
	///          associated with all .resx files this class depends on.  Otherwise,
	///          the designers will not be able to interact properly with localized
	///          resources associated with this form.
	/// </summary>
	public ref class Form1 : public System::Windows::Forms::Form
	{
	public:
		Form1(void)
		{
			String ^ data;
			InitializeComponent();
			//
			//TODO: Add the constructor code here
			//
		}

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~Form1()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::Button^  button1;
	protected: 
	private: System::Windows::Forms::Label^  label1;

	private:
		/// <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->button1 = (gcnew System::Windows::Forms::Button());
			this->label1 = (gcnew System::Windows::Forms::Label());
			this->SuspendLayout();
			// 
			// button1
			// 
			this->button1->Location = System::Drawing::Point(197, 17);
			this->button1->Name = L"button1";
			this->button1->Size = System::Drawing::Size(73, 28);
			this->button1->TabIndex = 0;
			this->button1->Text = L"button1";
			this->button1->UseVisualStyleBackColor = true;
			this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click);
			// 
			// label1
			// 
			this->label1->AutoSize = true;
			this->label1->Location = System::Drawing::Point(22, 108);
			this->label1->Name = L"label1";
			this->label1->Size = System::Drawing::Size(35, 13);
			this->label1->TabIndex = 1;
			this->label1->Text = L"label1";
			// 
			// Form1
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(292, 266);
			this->Controls->Add(this->label1);
			this->Controls->Add(this->button1);
			this->Name = L"Form1";
			this->Text = L"Form1";
			this->ResumeLayout(false);
			this->PerformLayout();

		}
#pragma endregion
	private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
				 ifstream ifs;
				 ifs.open( "test.txt", std::ios::in );

				
				 ifs >> data;

				 label1->Text = data;


				 ifs.close();
			 }
	};
}

[modoran]

This is not c++ language. And your includes must be in angle brackets, not double quotes:
#include <fstream>

[ATMventure]

I tried that and it still gives me the same errors.

I also edited the code example and changed it to '<<'.

[webJose]

As stated by modoran, you are not showing C++ code, but C++/CLI, which is pretty much a different language. In your button's click event you are mixing C++ with C++/CLI. Without knowing C++/CLI, I dare say this is not valid. Double check, of course. I believe you can use regular C++ but not all of the sudden as you are doing. Best thing you can do: Search the net for an introductory tutorial on C++/CLI.

[3hM2Nwbp]

C++ and C++/CLI should interop without issues (I use C++/CLI for user interfaces for my libraries.)

Post the exact compiler output that you're getting if you want help.

Offhand, I can see that:

1) ifstream doesn't exist in the global namespace, nor the Cttest007 namespace

// Did you mean
std::ifstream
// ? 

2) std::string cannot convert to System::String

http://codeoflegend.blogspot.com/2011/04/ccli-stdstring-to-systemstring.html 

[z05DSL3A]

Luc Lieber wrote:

C++ and C++/CLI should interop without issues

Yeah but there is no need to interop here, just do it all in C++/CLI.

Look at FileStream, StreamReader in System.IO Namespace

[ATMventure]

Thanks for your help I have figured it out and its working fine now.