Converting data from TextBox (String^) to string

iMikki

Hello people, I am trying to make an application with in- and output. Input by textboxes and output by writing it to a file. I succeeded to get text from a TextBox^ and put it in a RichTextBox^. No problem. I succeeded to use fstream to 'print' data (string) to a file. Now I want to combine these by using a vector. The problem I am facing is that if I do: fout << textBox->Text; that I get the following error:

1< d:\stageappvc\terminalapp\terminalapp\Form1.h(185) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'System::String ^' (or there is no acceptable conversion)
1< C:\Program Files\Microsoft Visual Studio 9.0\VC\include\ostream(653): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)

If I want to write the

textBox->Text

to my vector. I get the following error:

1>d:\stageappvc\terminalapp\terminalapp\Form1.h(194) : error C2664: 'std::vector<_Ty>::push_back' : cannot convert parameter 1 from 'System::String ^' to 'const std::string &'

I tried to find out what this String^ actually is - but I could not find an accurate answer. I also tried:

textBox->Text.toString()

which failed too. Is anyone able to help me with this? I tried to find examples of how to put TextBox data in a string, but I couldn't find anything useful... Kind regards, Mikki Weesenaar

transoft

Don't use "System::String" instead use "std::string"

iMikki

I have: std::vector textCode; private: System::Windows::Forms::RichTextBox^ textBox; private: System::Windows::Forms::TextBox^ invoerVeld; textBox->Text += invoerVeld->Text + "\r\n"; < works fine textCode.push_back(textBox->Text); < no-go textCode.push_back(invoerVeld->Text); 1>d:\stageappvc\terminalapp\terminalapp\Form1.h(194) : error C2664: 'std::vector<_Ty>::push_back' : cannot convert parameter 1 from 'System::String ^' to 'const std::string &' 1>d:\stageappvc\terminalapp\terminalapp\Form1.h(195) : error C2664: 'std::vector<_Ty>::push_back' : cannot convert parameter 1 from 'System::String ^' to 'const std::string &' So I think I cannot just use string in stead of String. Its a native thing of the TextBox and RichTextBox. I guess... Or if Im wrong, correct me :)

_Superman_

I got this from MSDN -

String^ c = gcnew String("Change Me");
std::string str1 = (const char*)(Marshal::StringToHGlobalAnsi(s)).ToPointer();
std::wstring str2 = (const wchar_t*)(Marshal::StringToHGlobalUni(s)).ToPointer();

«_Superman_» I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++)

iMikki

I dont see the relation between the first line and the other two. And I need it otherwise. I have a String^ (coming from textBox->Text) and I want to store this in a string (which I have in a vector).

_Superman_

The first line creates a String^. I believe you already have that in textBox->Text. The second line converts that to a string. The third line converts that to a wstring. What else do you not see?

«_Superman_» I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++)

iMikki

I guess I need the second then. Currently I have

std::string str1 = (const char*)(Marshel::StringToHGlobalAnsi(textBox->Text)).ToPointer();

But it gives me the following errors:

1>d:\stageappvc\terminalapp\terminalapp\Form1.h(200) : error C2653: 'Marshel' : is not a class or namespace name
1>d:\stageappvc\terminalapp\terminalapp\Form1.h(200) : error C2228: left of '.ToPointer' must have class/struct/union
1> type is ''unknown-type''
1>d:\stageappvc\terminalapp\terminalapp\Form1.h(200) : error C3861: 'StringToHGlobalAnsi': identifier not found

So I tried to #include , but that didn't work either. How can I use this function? And by the way - thanks for your fast replies :)

_Superman_

Typo It should be Marshal. You got it wrong there. Look at my posting.

«_Superman_» I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++)

iMikki

1>d:\stageappvc\terminalapp\terminalapp\Form1.h(7) : fatal error C1083: Cannot open include file: 'Marshal': No such file or directory :p Yeh - I corrected it but copied the wrong stuff I saw... But with A its still not working :( I am using Visual C++ Express Edition. Downloaded the package yesterday :p

_Superman_

I suspect some mix-up in your code. You do not have to include any file called Marshal. And you can use this class only in managed applications.

«_Superman_» I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++)

iMikki

#pragma once
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
//#include <Windows.h>

namespace TerminalApp {

using namespace std;
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>

//Variabele waar alle code in komt te staan//
std::vector<string> textCode;

public ref class Form1 : public System::Windows::Forms::Form
{
public:
	Form1(void)
	{
		InitializeComponent();
		//
		//
	}

protected:
	/// <summary>
	/// Clean up any resources being used.
	/// </summary>
	~Form1()
	{
		if (components)
		{
			delete components;
		}
	}
private: System::Windows::Forms::Button^  exitButton;
private: System::Windows::Forms::Button^  addText;
private: System::Windows::Forms::RichTextBox^  textBox;
private: System::Windows::Forms::Button^  saveButton;
private: System::Windows::Forms::TextBox^  invoerVeld;
private: System::Windows::Forms::Button^  voegTextButton;


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->exitButton = (gcnew System::Windows::Forms::Button());
this->addText = (gcnew System::Windows::Forms::Button());
this->textBox = (gcnew System::Windows::Forms::RichTextBox());
this->saveButton = (gcnew System::Windows::Forms::Button());
this->invoerVeld = (gcnew System::Windows::Forms::TextBox());
this->voegTextButton = (gcnew System::Windows::Forms::Button());
this->SuspendLayout();
//
// exitButton
//
this->exitButton->Location = System

_Superman_

Try adding this line -

using namespace System::Runtime::InteropServices;

«_Superman_» I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++)

iMikki

1>d:\stageappvc\terminalapp\terminalapp\Form1.h(200) : error C2653: 'Marshel' : is not a class or namespace name
1>d:\stageappvc\terminalapp\terminalapp\Form1.h(200) : error C2228: left of '.ToPointer' must have class/struct/union
1> type is ''unknown-type''
1>d:\stageappvc\terminalapp\terminalapp\Form1.h(200) : error C3861: 'StringToHGlobalAnsi': identifier not found

Is there any other known way to get text out such TextBox into a string? One made by Microsoft themselves? :p

_Superman_

You have typed in Marsh**e**l. The correct spelling is Marsh**a**l. Do you see the difference?

«_Superman_» I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++)

iMikki

How strange - because I copied it directly from your post - since first of all I hate typing and secondly its always better to copy paste :p But it is working now - let me test the output etc. Thanks in advance <3

_Superman_

:thumbsup: But I really think you should not be driving now. :)

«_Superman_» I love work. It gives me something to do between weekends.
Microsoft MVP (Visual C++)

iMikki

No Im not driving lol. It works! *cheering the hell outta it* Adding text to the TextBox and with a button its sending the data to my vector string which can be read and send to the output :-\ Thank you very very much! I really needed this line! <33 :rose: