Write data into .txt file created by CFileDialog, in C++

Question

I wanna Write data into .txt file created by CFileDialog, in C++.

The problem I am facing is that below codes doesn't work, although there is no build error. The .txt file created by CFileDialog can not be found for some reason. What's wrong the code?

what's the efficient way to Write data into .txt file created by CFileDialog, in C++?

Thanks

CFileDialog dlg(FALSE, NULL, NULL, OFN_OVERWRITEPROMPT,
    _T("My Data File (*.txt)|*.txt||"));
if(dlg.DoModal() != IDOK)
     return;
CString filename = dlg.GetPathName();
ofstream outfile (filename);
int mydata = 10;
outfile << "my data:" << mydata << endl;
outfile.close();

Answer 1

Why are you trying to use ofstream when you using MFC? You could use a CFile isn't it? Any specific reason why you are using ofstream?

Answer 2

Without knowing about some settings I can only do a qualified guess.

E.g. depending on how you compile this, UNICODE or !UNICODE the CString behaves differently, i.e. maps to etiher CStringA or CStringW. The CString also behaves differently depending on the MFC version, in some cases there is a operator to implicit convert to a c string, in some not.

An ofstream normally expects a const char* as argument, so you may want to change it to

ofstream outfile(filename.GetBuffer(255)); 

in that case.

EDIT:

Did you check if you could open the file? from the above code it seems you assume success...

if ( outfile.is_open() )
...