Mega Code Archive
How to read a binary file and display the byte values as ASCII
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Title: How to read a binary file and display the byte values as ASCII
type
TDisplayProc = procedure(const s: string) of object;
procedure ShowBinary(var Data; Count: Cardinal; DispProc: TDisplayProc);
implementation
procedure ShowBinary(var Data; Count: Cardinal; DispProc: TDisplayProc);
var
line: string[80];
i: Cardinal;
p: PChar;
nStr: string[4];
const
posStart = 1;
binStart = 7;
ascStart = 57;
HexChars: PChar = '0123456789ABCDEF';
begin
p := @Data;
line := '';
for i := 0 to Count - 1 do
begin
if (i mod 16) = 0 then
begin
if Length(line) 0 then
DispProc(line);
FillChar(line, SizeOf(line), ' ');
line[0] := Chr(72);
nStr := Format('%4.4X', [i]);
Move(nStr[1], line[posStart], Length(nStr));
line[posStart + 4] := ':';
end;
if p[i] = ' ' then
line[i mod 16 + ascStart] := p[i]
else
line[i mod 16 + ascStart] := '.';
line[binStart + 3 * (i mod 16)] := HexChars[(Ord(p[i]) shr 4) and $F];
line[binStart + 3 * (i mod 16) + 1] := HexChars[Ord(p[i]) and $F];
end;
DispProc(line);
end;
procedure TForm1.Display(const S: string);
begin
Memo1.Lines.Add(S);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
ms: TMemoryStream;
begin
if Opendialog1.Execute then
begin
ms := TMemoryStream.Create;
try
ms.LoadFromfile(OpenDialog1.FileName);
ShowBinary(ms.Memory^, ms.Size, Display);
finally
ms.Free
end;
end;
end;
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