Writing file

I use this :
CFile FileName(m_csTemp,CFile::modeCreate | CFile::modeWrite);
to create a file. This expression erase all of the existing files which have the same name. Is there a function which allow to see if a file with the same name already exists ?

Thank's for advance.

Why not you check using an 'if' - 'else' condition before you create the Cfile?
Hope this will help.
Cheers.

How to check ?
if ( what ??? )

1. To determine if a file exists you could use PathFileExists;
2. You could use flag CFile::modeNoTruncate . From MSDN:

Quote:

---

Combine this value with modeCreate. If the file being created already exists, it is not truncated to 0 length. Thus the file is guaranteed to open, either as a newly created file or as an existing file. This might be useful, for example, when opening a settings file that may or may not exist already. This option applies to CStdioFile as well.

---

Ok, thank's. And if the file already exists, I'd like to enter a new file name...

If you use standard CFileDialog (as "Save as...") or GetSaveFileName API to select the file to write in,
you could use flag OFN_OVERWRITEPROMPT that will

Quote:

---

... cause the Save As dialog box to generate a message box if the selected file already exists. The user must confirm whether to overwrite the file.

---

Is OFN_OVERWRITEPROMPT explained in MSDN ?
I don't see it...

Have you searched MSDN for it?
My MSDN (october 2000) gives me 16 article having OFN_OVERWRITEPROMPT :wave:
Ok! Have a look at OPENFILENAME structure

It's OK I saw it...

Is that code OK to display a CFileDialog ?

CFileDialog(FALSE,NULL,NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,NULL,NULL);
CFileDialog::DoModal;

It doesn't seem to work...

Quote:

---

Is that code OK to display a CFileDialog ?

CFileDialog(FALSE,NULL,NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,NULL,NULL);
CFileDialog:: DoModal;

---

Almost... :rolleyes: with some corrections...
I usualy add flag OFN_EXPLORER and test the return value of DoModal:

Code:

---

CFileDialog  cfdlg(FALSE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_EXPLORER,
                    NULL, NULL);
CString strFileName;
int iRet = cfdlg.DoModal();
if(iRet  == IDOK)
{
        //  get selected name:
        strFileName = cfdlg.GetPathName();
}
else
{
        //  error handling
}

---

Ok thank's it works well !
I have a another question. Is there a function "OnClickSave" which allow to do some extra operations when saving?

Which "some extra operations " do you mean?

My question is that when I click on "Save", does the program go on the following line of my program which might be :
CFile FileName(m_csTemp,CFile::modeCreate | CFile::modeWrite);
to create and write my file ?

And if I click "cancel", does it exit from the function it is called from?


For "PathFileExists", is the syntax OK :
if (PathFileExists(csFileName) == TRUE)
{
// Do smthg
}

The calling of this function might not be good cause "Undeclared identifier"...

Quote:

---

My question is that when I click on "Save", does the program go on the following line of my program which might be :
CFile FileName(m_csTemp,CFile::modeCreate | CFile::modeWrite);
to create and write my file ?

And if I click "cancel", does it exit from the function it is called from?

---

I should repeat: you must check the DoModal return value before doing someting else:

Code:

---

CFileDialog  cfdlg(FALSE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_EXPLORER,
                    NULL, NULL);
int iRet = cfdlg.DoModal();
if(iRet  == IDOK)
{
        //  Save button was clicked
        //  get selected name:
        m_csTemp = cfdlg.GetPathName();
        //  now you could work with the selected file:
        CFile FileName(m_csTemp,CFile::modeCreate | CFile::modeWrite);
        .............
}
else // iRet  == IDCANCEL
{
        // Cancel button was clicked
        // you could call the WindowsCommDlgExtendedError function to determine whether an error occurred.
        //  (see MSDN CFileDialog::DoModal )
        ..............
}

---