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Initializing a CMemFile derived class

Posted on 1998-11-05
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Last Modified: 2013-11-20
To work on a file i have derived one class from CMemFile.
Then the idea is to load the memory with the file (its working fine)
the problem is that everytime i end the application this appears in the output window:
"
Detected memory leaks!
Dumping objects ->
{56} normal block at 0x00674260, 1000 bytes long.
 Data: <                > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD
Object dump complete.
"

here how i am creating my class CIntelHexaFile

BYTE *pBuf = (BYTE*) new BYTE(10000);
m_HexaMem  = (CIntelHexaFile*) new CIntelHexaFile(pBuf,10000,5000);

this is done in other object constructor. In the destructor i do :
delete m_HexaMem;

m_HexaMem is declared as CIntelHexaFile * m_HexaMem.


Can anyone tell me what is the problem?
(pBuf is destructed be the CMemFile destructor.Right?)
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Question by:jmartins71
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jstolan earned 50 total points
ID: 1324254
pBuf will only be destroyed if the CMemFile m_bAutoDelete member variable is TRUE.  When you create the class with the constructor you have chosen, m_bAutodelete initializes to FALSE.

Since you are creating the buffer, it's probably cleaner for you to delete it explicitly.  For the record, here is the destructor of CMemFile:

CMemFile::~CMemFile()
{
      // Close should have already been called, but we check anyway
      if (m_lpBuffer)
            Close();
      ASSERT(m_lpBuffer == NULL);

      m_nGrowBytes = 0;
      m_nPosition = 0;
      m_nBufferSize = 0;
      m_nFileSize = 0;
}

And here is the close function it calls:

void CMemFile::Close()
{
      ASSERT_VALID(this);

      m_nGrowBytes = 0;
      m_nPosition = 0;
      m_nBufferSize = 0;
      m_nFileSize = 0;
      if (m_lpBuffer && m_bAutoDelete)
            Free(m_lpBuffer);
      m_lpBuffer = NULL;
}


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Author Comment

by:jmartins71
ID: 1324255
thanks jstolan.
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