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How to read a file in binary mode Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
20-Oct-02
Category
Files Operation
Language
Delphi 2.x
Views
128
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Jonas Bilinkevicius

How can I read a file and get the first 10 bytes of that file in its hexadecimal 
format?

Answer:

1   function FirstTenBytes(const sFile: TFileName): string;
2   var
3     oIn: TFileStream;
4     iRead: Integer;
5     iMaxRead: Integer;
6     iData: Byte;
7   begin
8     Result := '';
9     oIn := TFileStream.Create(sFile, fmOpenRead or fmShareDenyNone);
10    try
11      iMaxRead := 10;
12      if iMaxRead > oIn.Size then
13        iMaxRead := oIn.Size;
14      for iRead := 1 to iMaxRead do
15      begin
16        oIn.read(iData, 1);
17        Result := Result + IntToHex(iData, 2);
18      end;
19    finally
20      FreeAndNil(oIn);
21    end;
22  end;


			
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