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Access a binary file.

Posted on 1999-07-23
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Last Modified: 2012-05-04
Suppose a binary file, say SAMPLE.EXE is 111,234 bytes long.
If I want to "extract" some contents from sample.exe and output it to another file(extract.dat), for instance, copy from 10,000th bytes to 12,499th bytes, a total of 2,500 bytes.
How can I do so?  Thanks in advance!
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Question by:yingkit
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3 Comments
 
LVL 10

Accepted Solution

by:
Lischke earned 60 total points
ID: 1390721
1) Use a file stream and open the file (not necessarily an executable).
2) Set the streams position to the one you need.
3) Create a target sream for the part to extract.
4) Call TargetStream.CopyFrom(SourceStream, NumberOfBytesToCopy).
5) Close both streams.

Ciao, Mike
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Author Comment

by:yingkit
ID: 1390722
Can you pls provide me detail source codes?  I am only a beginner... :-(
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LVL 10

Expert Comment

by:Lischke
ID: 1390723
Right, here's the code:

procedure ExtractFile(const Source, Target: String; Start, Length: Cardinal);

// Extracts from a file which name is passed in Target from
// another file which name is passed in Source. Both strings
// must include valid pathes. Start determines the start
// position in Source and Length the the length of the file
// to be extracted.

var SourceStream, TargetStream: TFileStream;

begin
  SourceStream := TFileStream.Create(Source, fmOpenRead);
  TargetStream := TFileStream.Create(Target, fmOpenWrite);
  SourceStream.Position := Start;
  TargetStream.CopyFrom(SourceStream, Length);
  SourceStream.Free;
  TargetStream.Free;
end;

Ciao, Mike
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