save listbox data to a text file.

[tarja311]

Hi all,

I am trying to save all the contents inside a listbox to a txt file. Unfortunately i can't seem to get it right. The txt file that is read into the listbox contains up to 7,000 lines. I want to be able to edit and save it.

This is what i've come up with :

IDC_LIST1 is the listbox control.

	CListBox* p_ListBox = (CListBox*) GetDlgItem(IDC_LIST1);
	CStdioFile savefile;

	savefile.Open("C://myfile.txt", CFile::modeReadWrite);

	CString theText = "";


	p_ListBox->GetWindowText(theText);
	savefile.WriteString(theText);
	

	savefile.Close();

With a little modification it works fine with an editbox. But i can't get it working with a listbox.

I am using Visual Studio 2003, MFC, Dialog based.

Any help would be greatly appreciated.

Thank you

-- tarja

[g_gili]

AFAIK you can't enter 7000 items into a list box.... but not 100%.

[golanshahar]

Here try this code:

  // fill the list
  for ( int ii=0; ii< 50000; ii++ )
  {
    char str[MAX_PATH]={0};
    sprintf(str,"%d",ii);
    m_list.AddString(str);
  }

  // write it to file
  FILE *fp = fopen ( "c:\\time.txt","w");
  for (  ii=0; ii< m_list.GetCount(); ii++ )
  {
    char str[MAX_PATH]={0};
    m_list.GetText(ii,str);
    fprintf(fp,"%s\n",str);
  }
  fclose(fp);

Cheers

[tarja311]

Thank you. That works but one problem. If the file is, say, only 3 lines long, the write code above puts in too many blank spaces. Is there a way for it to know when the end of the file has been reached?

[golanshahar]

Thank you. That works but one problem. If the file is, say, only 3 lines long, the write code above puts in too many blank spaces. Is there a way for it to know when the end of the file has been reached?

Your question is not clear, what kind of blanks are you referring to? The code above writes a line and at the end ( \n ) which is end of line

Cheers

[tarja311]

The code above, when reading a 3 lined file, acts as if i hit the enter key 5000 times after the 3rd line.

[golanshahar]

The code above, when reading a 3 lined file, acts as if i hit the enter key 5000 times after the 3rd line.

ok now i got it, in the writing loop replace this line:

for (  ii=0; ii< 50000; ii++ )

with this line:

for (  ii=0; ii<m_list.GetCount(); ii++ )

Cheers

[tarja311]

Awesome! Thank you very much. You've been most helpful. :]

[golanshahar]

You are welcome

Cheers

[cilu]

Well, just a small thing, I sugest using CStdioFile and CString instead of FILE and char*.

  CString str;
  // fill the list
  for ( int ii=0; ii< 50000; ii++ )
  {
    str.Format("%d", ii);
    m_list.AddString(str);
  }

  // write it to file
  CStdioFile file;
  if(file.Open("text.txt", CFile::modeWrite|CFile::modeCreate))
  {
     int total = (int)m_list.GetCount();

     for (  ii=0; ii< total; ii++ )
     {
       m_list.GetText(ii, str);
       file.WriteString(str);
     }
  }