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Creating a text file containing no control characters?

Posted on 2004-08-02
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Last Modified: 2013-11-20
I need to create a text file in VC++ .NET containing plain numbers with no control characters which can be read with, say, the Notepad (the way text (not binary) files are created in, say, VB.NET). It appears that all examples given in a book such as Deitel’s “Visual C++ .NET. How to Program” create files which contain control characters and encrypt the data. Is that it? Isn’t there a way to create plain and simple text files in VC++ .NET containing no additional characters that can be viewed by common text editors?
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Question by:judico
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7 Comments
 
LVL 16

Expert Comment

by:nonubik
ID: 11691863
HANDLE      hFile = CreateFile(m_strFileName, GENERIC_READ, 0, 0, CREATE_NEW, FILE_ATTRIBUTE_HIDDEN, 0);
if (hFile == INVALID_HANDLE_VALUE)
{
      OutputDebugString(_T("\nError creating file"));
            
}      
else
{      
                TCHAR      szLine[] = _T("Some text here");
      DWORD      dwBytes;
                WriteFile(hFile, szLine, sizeof(szLine), &dwBytes, 0);
      CloseHandle(hFile);
{
0
 

Author Comment

by:judico
ID: 11694131
I am having problems implementing above code in managed environment (when trying to use forms). Also, what is the corresponding code for reading the created text file? I would appreciate it very much if you could post a working example using forms in VC++ .NET. Thank you in advance.
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Author Comment

by:judico
ID: 11695228
I found a link that seems to solve the problem:

http://support.microsoft.com/default.aspx?scid=kb;%5BLN%5D;307398&product=vcNET#1

There were several typos to be corrected, otherwise it works fine. Now the problems with OpenFileDialog and SaveFileDialog remain to be solved. To start, how can one change the directory in which the file is written in the code:

StreamWriter* pwriter = new StreamWriter( S"\\KBTest.txt" );   ?
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LVL 16

Expert Comment

by:nonubik
ID: 11701137
StreamWriter* pwriter = new StreamWriter( S"c:\\My_Directory\\KBTest.txt" );  
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Author Comment

by:judico
ID: 11706105
This is what I needed:

//This demonstrates how to READ a text file:
      private: System::Void button1_Click(System::Object *  sender, System::EventArgs *  e)
                   {
// Use try...catch to deal with a 0 byte file or a non-existent file.
listBox1->Items->Clear();

try  
{    
      
OpenFileDialog *fileChooser = new OpenFileDialog();
Windows::Forms::DialogResult result = fileChooser->ShowDialog();

// name of file containing data
String *fileName;

// exit event handler if user clicked Cancel
if ( result == DialogResult::Cancel )
     return;

// get specified file name
fileName = fileChooser->FileName;

// show error if user specifies invalid data
if ( ( fileName->Equals( S"" ) ) )
MessageBox::Show( S"Invalid File Name", S"Error",
                         MessageBoxButtons::OK, MessageBoxIcon::Error );

else {

       String* textFile = String::Concat( fileName );
             
     }

      StreamReader *reader = new  StreamReader(fileName);
      do
      {
      listBox1->Items->Add(reader->ReadLine());
      }  
      while(reader->Peek() != -1);
}    
catch(FileNotFoundException *ex)
{
      listBox1->Items->Add(ex);
}  
       
catch (System::Exception *e)
{
      listBox1->Items->Add(e);
}

                   }




 // This demonstrates how to create and to WRITE to a text file.
private: System::Void button2_Click(System::Object *  sender, System::EventArgs *  e)
             {

SaveFileDialog *fileChooser = new SaveFileDialog();
Windows::Forms::DialogResult result = fileChooser->ShowDialog();

String *fileName;

fileChooser->CheckFileExists = false;

if ( result == DialogResult::Cancel )
     return;

fileName = fileChooser->FileName;

if ( ( fileName->Equals( S"" ) ) )
MessageBox::Show( S"Invalid File Name", S"Error",
                         MessageBoxButtons::OK, MessageBoxIcon::Error );

else {
StreamWriter* pwriter = new StreamWriter( fileName );
pwriter->WriteLine( S"The file was created by using the StreamWriter class." );
pwriter->Close();

listBox1->Items->Clear();
String *filew = new String(S"File written to C:\efi\KBTest.txt");
listBox1->Items->Add(filew);

}

Now, the next step is to find out how to place the two columns of numbers in my text file in two separate arrays which I want to use later in the program.

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Accepted Solution

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CetusMOD earned 0 total points
ID: 11895558
Closed, 50 points refunded.
CetusMOD
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