檔案伺服器讀寫簡單樣本

_LIT(KFileName,"C://data//example.txt");
_LIT8(KDataString,"Modified Data");

 void CTestCSAppView::ReadFileL()
 {
 RFs fsSession;
 RFile rFile;
 
 User::LeaveIfError(fsSession.Connect());
 CleanupClosePushL(fsSession);
 
 User::LeaveIfError(rFile.Open(fsSession,KFileName,EFileStreamText));
 CleanupClosePushL(rFile);
 
 TInt fileSize;
 rFile.Size(fileSize);
 
 HBufC8* fileData8 = HBufC8::NewLC(fileSize);
 TPtr8 ptr8(fileData8->Des());
 rFile.Read(ptr8);
 TBuf<20> buf;
 buf.Copy(ptr8);
 
 CAknInformationNote* note;
 note = new (ELeave) CAknInformationNote;
 note->ExecuteLD(buf);
 
 CleanupStack::PopAndDestroy(3);
 fsSession.Close();
 }

void CTestCSAppView::WriteFileL()
 {
 RFs fsSession;
 User::LeaveIfError(fsSession.Connect());
 CleanupClosePushL(fsSession);
 
 RFile file;
 TInt ret = file.Replace(fsSession,KFileName,EFileWrite | EFileStreamText);
 switch(ret)
 {
 case KErrNotFound:
  User::LeaveIfError(file.Open(fsSession,KFileName,EFileWrite | EFileStreamText));
  break;
 case KErrNone:
  break;
 default:
  User::Leave(ret);
  break;
 }
 CleanupClosePushL(file);
 
 User::LeaveIfError(file.Write(KDataString));
 
 CleanupStack::PopAndDestroy(2);
 }