How to display contents of a file to a text box?

Question

4.00/5 (1 vote)

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I want to display the contents of a file (data.txt) to a text box or label control once I click button control. But the code below only gives me one line, while I want the whole content to be retrieved from the file.

This is what I have so far:

private: System::Void Report_Click(System::Object^  sender, System::EventArgs^  e) {
try
         {
               FileStream^ fs = gcnew FileStream(L"data.txt", FileMode::Open);
               StreamReader^ sr = gcnew StreamReader(fs);

              int count = 0;
              for(;;)
              {
                     String^ line  = sr->ReadLine();
                   count++;
            if (line == nullptr) break;
                     this->ReportTextBox->Text=Convert::ToString(line);
                            }

         }
  catch(System::Exception^ pe)
         {
               Console::WriteLine(pe->ToString());
         }
}

Thanx in advance for any kind of help you can give me.

Posted 2-May-11 0:05am

macdonaldgeek

Updated 2-May-11 2:13am

Sergey Alexandrovich Kryukov

v3

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Olivier Levrey · Answer 1 · 2011-05-02T01:31:00

Solution 2

Try ReadToEnd method, and don't forget to close your file as soon as you don't need it anymore:

C

System::Void Report_Click(System::Object^  sender, System::EventArgs^  e)
{
    try
    {
        StreamReader^ sr = gcnew StreamReader(L"data.txt");
        //read the whole file
        this->ReportTextBox->Text = sr->ReadToEnd();
        //don't forget to close your file
        sr->Dispose();
    }
    catch(System::Exception^ pe)
    {
        Console::WriteLine(pe->ToString());
    }
}

Posted 2-May-11 1:31am

Olivier Levrey

Comments

macdonaldgeek 2-May-11 7:47am

Thanx Olivier, i'll try ReadToEnd and see if it works.

Sergey Alexandrovich Kryukov 2-May-11 8:16am

Yes, this is the answer, my 5.
--SA

Olivier Levrey 2-May-11 8:19am

Thank you SA.

Sergey Alexandrovich Kryukov 2-May-11 8:16am

It does. You better accept the answer formally (green button).
--SA

వేంకటనారాయణ(venkatmakam) · Answer 2 · 2011-05-02T00:22:00

Solution 1

I do not know about Managed c++\CLI.I am working in VC++.But from the code,

this->ReportTextBox->Text=Convert::ToString(line);

I understood that you are replcing the current text of textbox with new line in each loop.So you at the end you will have only one line in textbox(last line).If i am sure there will be + operator to append the text.

Posted 2-May-11 0:22am

వేంకటనారాయణ(venkatmakam)

Comments

macdonaldgeek 2-May-11 6:33am

you mean putting + like this or:

this->ReportTextBox->Text=Convert::ToString(line+);

వేంకటనారాయణ(venkatmakam) 2-May-11 6:57am

Like this, this->textBox1->AppendText(line);

Olivier Levrey 2-May-11 7:33am

Good answer, my 5. But you should tell OP about closing the file. Disposing of resources as soon as possible is a part of best practices.

వేంకటనారాయణ(venkatmakam) 2-May-11 7:44am

Thanks, I will do that next time:-)

macdonaldgeek 2-May-11 7:49am

Sure you'll do venkatmakam!

Sergey Alexandrovich Kryukov 2-May-11 8:15am

This is no "managed C++" anymore...
--SA