TIdURI类中有两个用于对URL进行编码/解码的静态方法
uses
IdURI;
..
begin
S := TIdURI.URLEncode(str);
//
S := TIdURI.URLDecode(str);
end;
在Delphi新版中，使用TNetEncoding.URL.Decode
Uses
NetEncoding;
function URLEncode(const s : string) : string;
begin
result := TNetEncoding.URL.Encode(s);
end
TIdUri或HTTPEncode的Unicode字符集有问题。以下功能将为您正确编码。
function EncodeURIComponent(const ASrc: string): UTF8String;
const
HexMap: UTF8String = '0123456789ABCDEF';
function IsSafeChar(ch: Integer): Boolean;
begin
if (ch >= 48) and (ch <= 57) then Result := True // 0-9
else if (ch >= 65) and (ch <= 90) then Result := True // A-Z
else if (ch >= 97) and (ch <= 122) then Result := True // a-z
else if (ch = 33) then Result := True // !
else if (ch >= 39) and (ch <= 42) then Result := True // '()*
else if (ch >= 45) and (ch <= 46) then Result := True // -.
else if (ch = 95) then Result := True // _
else if (ch = 126) then Result := True // ~
else Result := False;
end;
var
I, J: Integer;
ASrcUTF8: UTF8String;
begin
Result := ''; {Do not Localize}
ASrcUTF8 := UTF8Encode(ASrc);
// UTF8Encode call not strictly necessary but
// prevents implicit conversion warning
I := 1; J := 1;
SetLength(Result, Length(ASrcUTF8) * 3); // space to %xx encode every byte
while I <= Length(ASrcUTF8) do
begin
if IsSafeChar(Ord(ASrcUTF8[I])) then
begin
Result[J] := ASrcUTF8[I];
Inc(J);
end
else if ASrcUTF8[I] = ' ' then
begin
Result[J] := '+';
Inc(J);
end
else
begin
Result[J] := '%';
Result[J+1] := HexMap[(Ord(ASrcUTF8[I]) shr 4) + 1];
Result[J+2] := HexMap[(Ord(ASrcUTF8[I]) and 15) + 1];
Inc(J,3);
end;
Inc(I);
end;
SetLength(Result, J-1);
end;