Re: Cstring WriteString not working also write not working

From:

"Tom Serface" <tom@nospam.camaswood.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 28 Jan 2009 08:22:16 -0800

Message-ID:

<6112BF91-784D-46EF-AC35-8CFB3A8833B3@microsoft.com>

I have never heard that the memory wasn't released immediately in
CStringArray::RemoveAll(). I do know that deleted memory is often not
reflected in Task Manager for some time and often not until the program
ends, but is actually available for reuse.

Either of the methods suggested would work so long as the file is reasonable
small (less than the amount of free memory).

Tom

"jjoohhnn" <jjoohhnn@microsoft.discussions.com> wrote in message
news:utnmVrTgJHA.4220@TK2MSFTNGP06.phx.gbl...

Mike,

   We can go for CStringArray in case of less number of lines in a file.

   AFAIK CStringArray's object memory will not release immediately after
CStringArrayObject.RemoveAll() called, in case of huge number of lines in
a file.

   I suggest, Create temporary file and Update modified data into this.
Then Make 0 Kb size for source file then delete it.

   Please correct me If I am wrong.

Regards,
John.

"Mike Butler" <antivirus@jhuapl.edu> wrote in message
news:glnrkd$c9k$1@aplnetnews.jhuapl.edu...

Read file into a CstringArray.
Parse the CstringArray and edit the contents of the CString of interest.
Write CStringArray back to file.

"zack" <zack@discussions.microsoft.com> wrote in message
news:AB723EF4-CB8F-45BE-9CED-4B3DA9736037@microsoft.com...

Hi I am trying to cahnge one line in a TXT file (log file of my
application),
the TXT file already include many line and i try to recognize the line i
need and then update it with the string i need,
But WriteString looks like it finish fine no fail,
But the TXT file doesn't change .
Here is the code:

CString readLine,CompareResultFile="c:\a.txt";//the file path is just an
example
CStdioFile LogFile_CStdioFile;
char * full_Log_file_path= (char*)malloc (_MAX_PATH);
int numLines=0;
TCHAR PASS_test[] = _T("Result: PASS");
TCHAR FAIL_test[] = _T("Result: FAIL");

if (!LogFile_CStdioFile.Open(CompareResultFile, CFile::modeReadWrite ))
{
    return FALSE;
}
while(LogFile_CStdioFile.ReadString(readLine) )
{
               sprintf(full_Log_file_path,"%S",readLine.GetBuffer(0));
if(strncmp(full_Log_file_path,"Result:",7))
{
numLines++;
continue;
}
else
{
      if(Status)
      {
        LogFile_CStdioFile.WriteString(PASS_test);
      }
      else
     {
LogFile_CStdioFile.WriteString(FAIL_test);
     }
     break;
}
}
LogFile_CStdioFile.Close();

I need suggestion what is the best way to update one line?