TextBox sadface

[CaliberC]

So I've been working on this project (simple Note Program) to help me learn C++ and provide me with new Features.

Ran into One issue that I am Confuzzled By.
Basically, I have a TextBox and a button. When i Click the Button, what is in the TextBox gets written to a TextFile. But, i get an error message that is really long that ends in..........
"(while trying to match the argument list '(std::ofstream, System::Windows::Forms::TextBox ^))"

inpline1 is my TextBox's Name
Buttons Code VvV

ofstream myfile ("example.txt");
  if (myfile.is_open())
  {
    myfile << inpline1;
    myfile.close();
  }

im using VB C++ 2010
Win XP SP3

[MiiNiPaa]

I don't familiar with Visual Studio, but it looks like you are trying to pass object to ofstream. There should be something like inpline1.text or something that will return string, contained in inpline1. You should pass that to myfile, not just inpline1.

[andywestken]

It does look like you're mixing (native) C++ with C++/CLI, which is a related but different language.

To get the System::String from the TextBox you need to use the Text property

// assuming inpline1 is a TextBox^
String^ example = inpline1->Text;

and then you need to convert the System::String into something ofstream can understand

IntPtr hglob = Marshal::StringToHGlobalAnsi(example); // from above
char* data = static_cast<char*>(hglob.ToPointer());

ofstream myfile ("example.txt");
if (myfile.is_open())
{
    myfile << data;
    myfile.close();
}

Marshal::FreeHGlobal(hglob);

or maybe

char buffer[1024]; // need to be careful with buffer size in real code
IntPtr hglob = Marshal::StringToHGlobalAnsi(example);
char* data = static_cast<char*>(hglob.ToPointer());
strcpy(buffer, data);
Marshal::FreeHGlobal(hglob);

// then write contents of buffer out using ofstream 

Andy

[CaliberC]

thnx andy, works just as needed.

[andywestken]

Cool!

The alternative is to stick with C++/CLI

    // from System::IO
    StreamWriter^ sw = gcnew StreamWriter(L"C:\\temp\\example22.txt");
    sw->WriteLine(inpline1->Text);
    sw->Close();

(assuming you already have a C:\Temp folder)

Andy

[CaliberC]

Craps'' ran into another similar issue during the Loading..

So now i Reload that Text File. But im getting another Conversion Error

getting the error Code (C2664)


inp1a is inpline1 From Up Top

string line;
  ifstream myfile ("example.txt");
  if (myfile.is_open())
  {
    while ( myfile.good() )
    {
      getline (myfile,line);
      //cout << line << endl;
        inp1a->Text = line; //This is where my issue is, not sure how to Convert this part
    }
    myfile.close();
  }

[andywestken]

If you want to read the file using ifstream and string, you'll need to construct a System::String from the string you read.

String^ value = gcnew String(line.c_str());
inp1a->Text = value;

Andy