function HTTPEncode(const AStr: string): string;
const
NoConversion = ['A'..'Z', 'a'..'z', '*', '@', '.', '_', '-'];
var
S,R: PChar;
begin
SetLength(Result, Length(AStr) * 3);
S:= PChar(AStr);
R:= PChar(Result);
while S^ <> #0 do
begin
if S^ in NoConversion then
R^ := S^
else if S^ = ' ' then
R^ := '+'
else
begin
FormatBuf(R^, 3, '%%%.2x', 6, [Ord(S^)]);
Inc(R, 2);
end;
Inc®;
Inc(S);
end;
SetLength(Result, R - PChar(Result));
end; procedure TForm1.Button1Click(Sender: TObject);
begin
Edit1.Text := HTTPEncode(Edit1.Text);
end;
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