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Article #16405

File Copy Operation

#16405
From: Muhammad Momin Rashid
Date: Thu, 15 May 2003 09:28
37 lines
2323 bytes
Hello All,

<Brief Description and background>
I made a program some time back for copying large files from one media to
another.  I am using TFileStream Object to read and write chunks of data
from an existing file to a new file (I am reading writing chunks of data
because in some cases I need to modify data before writing it to new file).

<Problem>
1. This approach is significantly slower than the windows file copy
operation itself.  I need to speed up my file coping operation.
2. The operation consumes a lot of processing power while reading from media
such as CDROM etc.  Is there any way to bring down the processor usage?
3. If there is a problem in file reading (bad or corrupted media) the system
locks up for a fair amount of time.  How to avoid this? and how can I
control the amount of time system has to keep trying before it quits trying
to read?

<Sample Code>

  fsPtrExistingFile = new TFileStream(EditFileToCopy->Text, fmOpenRead |
fmShareDenyWrite);
  fsPtrNewFile = new TFileStream(EditCopyTo->Text + asFileName, fmCreate |
fmShareDenyWrite);

  // Some code here

  // Loop till end of file is reached
  fsPtrExistingFile->Read(cPtrBuffer, lMaxBufferSize);
  fsPtrNewFile->Write(cPtrBuffer, lMaxBufferSize);

  // Clean up code here



Thanks for your time and effort
Muhammad Momin Rashid
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From: "Muhammad Momin Rashid" <momin@hotmail.com>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: File Copy Operation
Date: Thu, 15 May 2003 14:28:50 +0500
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