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Save in CSV file

Posted on 1997-12-09
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Last Modified: 2012-05-04
Dear
       I want to save the input which comes form interface in        a CSV file.But when I open CSV file with editor, It is not CSV type.
     And I want to append the information in the last line of file. How to modify?    
       The code is shown below
        Thank You for help
void CDeliverer::OnOkButton()
{
      // TODO: Add your control notification handler code here
            CFile f;                                                                   f.Open("C:\\TRY.CSV",
                                CFile::modeCreate|CFile::modeWrite);
      UpdateData(TRUE);
      CArchive ar(&f,CArchive::store);
      ar<<m_Var1;
      f.Write(m_Var1,m_Var1.GetLength());
      ar.Close();
      f.Close();

}
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Comment
Question by:logout
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9 Comments
 
LVL 2

Expert Comment

by:AlFa
ID: 1175597
You open your file with no truncate option an seek to end.

CFile f; f.Open("C:\\TRY.CSV",
 CFile::modeCreate|CFile::modeWrite|CFile::modeNoTruncate   );
f.Seek( 0L, CFile::end );
0
 

Author Comment

by:logout
ID: 1175598
Dear
        I can insert a comma betw each input data. But I find some porblem. First of all, When I add 2 set data, I find there are some unknown extra repeat data in the file. (please see the result).
And I hope the 2 set data in different line , How to change the code. Thank You

p.s temp=","

void CParcel::OnOkButton()
{
      // TODO: Add your control notification handler code       CFile f;
                     f.Open("C:\\Parcel.CSV",CFile::modeCreate
               |CFile::modeWrite
               |CFile::modeNoTruncate);
      f.Seek( 0L, CFile::end );
      UpdateData(TRUE);
       CArchive               ar(&f,CArchive::store);                                  ar<<m_PID<<m_Weight;
      f.Write(m_PID,m_PID.GetLength());
      f.Write(temp,temp.GetLength());
      f.Write(m_Weight,m_Weight.GetLength());
      f.Write(temp,temp.GetLength());
      ar.Close();
      f.Close();

}

Result:
===================================
1357 , HK  ,  1357HK         AASA , NNN ,  AASANNN    


Expect result:
===================================  
1357 , HK  ,  
 AASA , NNN ,
 
0
 
LVL 2

Expert Comment

by:AlFa
ID: 1175599
Why do you use 2 write method ?
use Carchive or Cfile not both
p.s temp=","

void CParcel::OnOkButton()
{
// TODO: Add your control notification handler code CFile f;
f.Open("C:\\Parcel.CSV",CFile::modeCreate
 |CFile::modeWrite
 |CFile::modeNoTruncate);
f.Seek( 0L, CFile::end );
UpdateData(TRUE);
//CArchive ar(&f,CArchive::store); ar<<m_PID<<m_Weight;
f.Write(m_PID,m_PID.GetLength());
f.Write(temp,temp.GetLength());
f.Write(m_Weight,m_Weight.GetLength());
f.Write(temp,temp.GetLength());
//ar.Close();
f.Close();

}

or
void CParcel::OnOkButton()
{
// TODO: Add your control notification handler code CFile f;
f.Open("C:\\Parcel.CSV",CFile::modeCreate
 |CFile::modeWrite
 |CFile::modeNoTruncate);
f.Seek( 0L, CFile::end );
UpdateData(TRUE);
CArchive ar(&f,CArchive::store);
ar<<m_PID;
ar<<temp;
ar<<m_Weight;
ar<<temp;
ar.Close();
f.Close();
}

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Author Comment

by:logout
ID: 1175600
Dear
        Thank for your help, If I want to get the value from the file,
       What is the code?

      f.Open("C:\\Parcel.CSV",CFile::modeRead)
       f.??(m_PID,10,  ','     );
10 means that read 10 char , comma is the separation betw the data
0
 
LVL 2

Expert Comment

by:AlFa
ID: 1175601
How to read?
 you have to read char by char up to ','

void ReadOne(CFile &f, CString &cStr)
{
    char c;
    cStr.Empty();
    do
    {
        if(f.Read(&c, 1)<1) return; // error?
        if(c==',') return;
        cStr += c;
    } while(1);
}

call this for each field

f.Open("C:\\Parcel.CSV",CFile::modeRead);
CString cStrTmp;
ReadOne(f, cStrTmp);
m_PID = atoi(cStrTmp);
etc ...

you could have a ft witch return CString or overloaded ft for each type you have to manage.


0
 

Author Comment

by:logout
ID: 1175602
Dear
I integrate the  following coding into my program. Is the wrong declaration

void CDeliverer::OnModifyButton()
{
      // TODO: Add your control notification handler code here
f.Open("C:\\Parcel.CSV",CFile::modeRead);
CString cStrTmp;
ReadOne(f, cStrTmp);
m_PID = atoi(cStrTmp);
f.Close();
}

void CDellverer::ReadOne(CFile &f, CString &cStr)
{
char c;
cStr.Empty();
do
{
if(f.Read(&c, 1)<1) return; // error?
if(c==',') return;
cStr += c;
} while(1);
}

In header filer
================
protected:

      // Generated message map functions
      //{{AFX_MSG(CDeliverer)
      afx_msg void OnExitButton();
      afx_msg void OnClearButton();
      afx_msg void OnOkButton();
      afx_msg void OnAddButton();
      afx_msg void OnModifyButton();
      afx_msg void ReadOne(CFile ,CString );  <- Wrong Declaration?

Error message:
error C2558: 'CFile' : no copy constructor available
error C2558: 'CFile' : no copy constructor available
error C2579: 'ReadOne(class CFile &,class CString &)' : parameter list not sufficiently different from 'ReadOne(class CFile,class CString)'

0
 
LVL 2

Accepted Solution

by:
AlFa earned 50 total points
ID: 1175603
afx_msg void ReadOne(CFile ,CString ); <- Wrong Declaration?
 you are right it's wrong.
declare it as
void ReadOne(CFile &, CString&); that's all.
Do not put instruction(declaration) in class wizard work
//{{AFX.....
 here
//}}AFX ...
b'cause next time you call it it will not reconize it's job an go to error.


0
 

Author Comment

by:logout
ID: 1175604
Dear
      Help again!
                How to disable the button (ADD button) before I enter all Fields and enable it when user enter all information in all fields. What is the coding?

0
 
LVL 2

Expert Comment

by:AlFa
ID: 1175605
Where is this add button?
To disable a button you've to get a variable on it with GetDlgItem
after you disable  it with EnableWindow.


CWnd * xx = GetDlgItem(#ID_ADD);
xx->EnableWindow(FALSE);

0

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