problems with WriteString and CStdioFile

problems with WriteString and CStdioFile

• YohanAudoux

  CString dateiname, text;
  CStdioFile file;
  // etc.
  
  if (file.Open(dateiname, CFile::modeWrite | CFile::modeCreate | CFile::modeNoTruncate, &e )) {
  if (file.GetLength() == 0) {
  text.Format(_T("Log file Bsp1 %s %s\n"), geraet, typ);
  }
  else {
  text.Format(_T("Bsp2 %s %s\n"), geraet, typ);
  }
  file.SeekToEnd();
  file.WriteString(text);
  file.Close();
  } // end if
  else {
  MessageBox(L"Fehler beim Dateioffnen",L"Error");
  }
  
  

• Super login chat

  this is the part from afx.h, it looks ok:
  
  
  class CStdioFile : public CFile
  {
      DECLARE_DYNAMIC(CStdioFile)

  public:
  // Constructors
      CStdioFile();
  WCE_DEL CStdioFile(FILE* pOpenStream);
      CStdioFile(LPCTSTR lpszFileName, UINT nOpenFlags);

  // Attributes
  WCE_DEL FILE* m_pStream;    // stdio FILE
                          // m_hFile from base class is _fileno(m_pStream)

  // Operations
      // reading and writing strings
  WCE_DEL virtual void WriteString(LPCTSTR lpsz);
  WCE_DEL virtual LPTSTR ReadString(LPTSTR lpsz, UINT nMax);
  WCE_DEL virtual BOOL ReadString(CString& rString);
  

  
  

• Luckyboy

  Hmmm... I don't know what's the problem. In other forums people told me the same: "no error, no warning". You wrote "MFC enable", I am looking for my settings. In the project seetings I found "Use MFC in a Shared DLL". Is it correct I should I switch to "Use MFC in a Static Library"  
  

• jamhow

  Additionally I have to say that I am using these libraries:
  #include <afx.h>
  #include <time.h> 
  #include <string.h>
  
  and others, too.

  
  

• the_lmich

  Have you checked up the evc4 help pages on CStdioFile
  
  
  
  Please find it here , It explains that write string is not supported
  
  --Srikanth (MSFT)
  
  
  
  
  
  
  
  Microsoft Foundation Class Library for Windows CE
  
  
  
  
  CStdioFile
  
  
  This class is derived from CFile. Because CStdioFile does not support any methods or data members that are not supported by CFile, use the CFile reference documentation for method specifics.
  
  Use CStdioFile, instead of CFile, when you want to work with Internet classes.
  
  A CStdioFile object represents a C run-time stream file as opened by the run-time function fopen. Stream files are buffered and can be opened in either text mode, the default, or binary mode.
  
  Text mode provides special processing for carriage return–linefeed pairs. When you write a newline character (0x0A) to a text-mode CStdioFile object, the byte pair (0x0A, 0x0D) is sent to the file. When you read, the byte pair (0x0A, 0x0D) is translated to a single 0x0A byte.
  
  The CFile methods Duplicate, LockRange, and UnlockRange are not supported for CStdioFile.
  
  If you call these functions on a CStdioFile, you will get a CNotSupportedException .
  
  Remarks
  
  MFC for Windows CE does not support the following methods of the standard MFC CStdioFile class:
  
  * CStdioFile::ReadString
  * CStdioFile::WriteString
  * CStdioFile::CFile
  * CStdioFile::Abort
  * CStdioFile::Flush
  * CStdioFile::Close
  * CStdioFile::Read
  * CStdioFile::Write
  * CStdioFile::LockRange
  * CStdioFile::UnlockRange
  * CStdioFile::GetPosition
  * CStdioFile::Open
  * CStdioFile::Duplicate
  
  In addition, MFC for Windows CE does not support the CStdioFile::m_pStream data member.
  
  Requirements
  
  Windows CE versions: 2.10 and later
  Header file: Declared in Afx.h
  
  See Also
  
  File Service Classes
  
  
  
  ________________________________
  
  Send feedback to Microsoft
  
  © 2001 Microsoft Corporation. All rights reserved.
  
  Topic Version 7.0.9429.1425
  
  

• jporto

  Strange! I have no explenation for this. The MFC is the same in this case, there is no special version for CStdioFile on the embedded devices.
  
  Do you have a small program to repro this
  
  

• mjf_29

  The code was not complete but I aded some variables and the code compiles without any problems under VS.NET 2003 and 2005 with MFC enabled in unicode.
  
  

• flyonthewall

  Did you ever looked into your afx.h
  Maybe you accidental change the afx.h!
  
  

• BruceJohnson

  Nein, habe ich nicht ! Weder reingeschaut noch geandert. Irgendwie konnte das Problem auch CE-spezifisch sein wurde mir in einem anderen Forum gesagt.
  
  For all others: No, I do not looked into it and I do not changed it.
  
• problems with WriteString and CStdioFile