Reading text file

This is a discussion on Reading text file within the C++ Programming forums, part of the General Programming Boards category; Hallo, I try to read a line of text in a file that looks like this: 10N11M12R where N, M ...

  1. #1
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    Reading text file

    Hallo,

    I try to read a line of text in a file that looks like this: 10N11M12R
    where N, M and R are numbers from 1 to 2000.
    For 3-digit numbers, I extracted N, M and R in this way:
    Code:
     int count = 0; 
     int ch;
      try
        {
         
            CStdioFile file(_T("temp.txt"), CFile::modeRead);
            CString str,mainstr = _T("");
     
            while(file.ReadString(str))
            {
                mainstr += str;
                mainstr += _T("\n");
            }
             
            textBox2 ->SetWindowTextA(mainstr.Mid(3,3));   // N
            textBox3 ->SetWindowTextA(mainstr.Mid(10,3)); // M
            textBox4 ->SetWindowTextA(mainstr.Mid(17,3)); // R    
          
        }
        catch(CException* e)//Catch by pointer as exceptions in MFC are crap
        {
            MessageBox(_T("Error - unable to open file"));
            e->Delete();//Lame...very lame...but needed
     
        }
    How can parse this line and determine the number of digits that contains N, M and R?

    Thanks,

    Haris
    Last edited by Haris1; 09-20-2012 at 06:46 AM.

  2. #2
    ZuK
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    Id try something like this
    Code:
    nr_N = mainstr.Find('N',0);
    nr_M = mainstr.Find('M', nr_N+1) - nr_N - 1;
    nr_R = mainstr.GetLength() - ( nr_N + nr_M + 2);
    This is not tested and propably wrong too but I hope you get the idea.
    Kurt

  3. #3
    RoD
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    How get all numbers by regex?

    should get you started on finding integers within a string.

  4. #4
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    Thanks, I try with your Feedback

    Haris

  5. #5
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    Thanks all, is now working.

    The release work fine on Windows 7 but not on XP(SP3). I have installed on XP Framework 4 and installed the application.
    Wen i try to write something througth the serialport, I get write failed. I cann't debug on Xp because VC 2010 ist not installed.
    The application is a MFC in a static Library and I think isn't a dll problem. What can the problem be?

    Haris

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