Jochen Kalmbach's WebLog

Addition to: How to write Textfiles with encoding in MFC

Martin Richter pointed me to a problem in my previous posted code-example regarding opening files with a specific encoding.
If you pass a FILE* stream to the CStdioFile constructor, then it will not auto-delete the file in the destructor!

To prevent this, you can use a derived class:

  class CStdioFileWithClose : public CStdioFile
  {
  public:
    CStdioFileWithClose(FILE *pOpenStream)
      : CStdioFile(pOpenStream)
    {
      m_bCloseOnDelete = TRUE;
    }
  };

Then the example should look like:

  // Open the file with the specified encoding
  FILE *fStream;
  errno_t e = _tfopen_s(&fStream, _T("test.txt"),
    _T("wt,ccs=UNICODE"));
  if (e != 0) return; // failed..
  CStdioFileWithClose f(fStream);  // open the file from this stream

  f.WriteString(_T("Test"));
  f.Close();