Ad:

C++ Discussion Thread
Unsolved
Views: 909

Oct 26th, 2007

File not closing

Expand Post »

Hi all,
This is my problem:

C++ Syntax (Toggle Plain Text)
void StartRun( void )
{
    std::auto_ptr<Validate> val ( new Validate( "input.txt" ) );
    val->DoIt( );
}
// Destructor
Validate::~WValidate( )
{
  if( mFileIn.is_open())
  {
    mFileIn.close();
  }
  if( mFileOut.is_open() )
  {
    mFileOut.flush();
    mFileOut.close();
  }
}
void StartRun( void )
{
    std::auto_ptr<Validate> val ( new Validate( "input.txt" ) );
    val->DoIt( );
}
// Destructor
Validate::~WValidate( )
{
  if( mFileIn.is_open())
  {
    mFileIn.close();
  }
  if( mFileOut.is_open() )
  {
    mFileOut.flush();
    mFileOut.close();
  }
}

The function DoIt() makes use of a DLL. Now heres the problem:
When there is an exception thrown by the DLL, I should say the
mFileOut should always be closed but it doesn't. I can't delete
the outputfile until I close my application because it says the
file is still open.
It only closes in the 'Debug Build' but not in the 'Release Build'.
Anyone has an idea ??
I use the Borland Developer Studio 2006.

Similar Threads

Syntax for deleting specified file ( in C++) in C++
memory management in wndows 2000 in Windows NT / 2000 / XP
Doesn't open for file input successfully.... why? in C++
Can someone debug my program??? in C
Application Data Folder... in Viruses, Spyware and other Nasties

disc

Reputation Points: 10

Solved Threads: 1

Light Poster

Offline

29 posts
since Sep 2006

Permalink

Oct 26th, 2007

Re: File not closing

Can you not catch all exceptions from DoIt ?

ithelp

Reputation Points: 769

Solved Threads: 128

Banned

Offline

1,910 posts
since May 2006

Permalink

Oct 26th, 2007

Re: File not closing

My guess is that your program is crashing sooooo bad that the destructor is not getting called, the program is just dumping back to the os without doing any cleanup. You really need to find out what is causing the exception and fix it. Lacking that you should implement exceptions (try/catch blocks) as ithelp suggested.

Ancient Dragon

Sponsor

Team Colleague

Featured Poster

Reputation Points: 5608

Solved Threads: 2283

Retired and Enjoying Life

Offline

21,963 posts
since Aug 2005

Permalink

Oct 26th, 2007

Re: File not closing

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

My guess is that your program is crashing sooooo bad that the destructor is not getting called, the program is just dumping back to the os without doing any cleanup. You really need to find out what is causing the exception and fix it. Lacking that you should implement exceptions (try/catch blocks) as ithelp suggested.

The try/catch block is already implemented in the DoIt function but that's not the solution because the exception is caused by a third party DLL.
It's still a fact that in the 'Debug Build' the destructor is called, and the file can be deleted, but in the 'Release Build' it isn't.
So suggestions are still welcome....

disc

Reputation Points: 10

Solved Threads: 1

Light Poster

Offline

29 posts
since Sep 2006

Permalink

Oct 26th, 2007

Re: File not closing

Click to Expand / Collapse Quote originally posted by disc ...

The try/catch block is already implemented in the DoIt function but that's not the solution because the exception is caused by a third party DLL.

Talk to the third party. They have a better chance of figuring out what's going wrong.

WaltP

Moderator

Reputation Points: 3281

Solved Threads: 896

Posting Sage

Offline

7,749 posts
since May 2006

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

Previous Thread in C++ Forum Timeline: one loop to perform 2 things

Next Thread in C++ Forum Timeline: Problem with static STL i.e. map

DaniWeb Message

Cancel Changes

User Name
Password