delphi 字母大小写转换
{ Author Arno Garrels - Feel free to optimize! }
{ It's anyway faster than the RTL routine. }
function LowerCaseAnsi(const S: AnsiString): AnsiString;
var
Ch : AnsiChar;
L, I : Integer;
Source, Dest: PAnsiChar;
begin
L := Length(S);
if L = 0 then
Result := ''
else begin
SetLength(Result, L);
Source := Pointer(S);
Dest := Pointer(Result);
for I := 1 to L do begin
Ch := Source^;
if Ch in ['A'..'Z'] then Inc(Ch, 32);
Dest^ := Ch;
Inc(Source);
Inc(Dest);
end;
end;
end;
{ Author Arno Garrels - Feel free to optimize! }
{ It's anyway faster than the RTL routine. }
function UpperCaseAnsi(const S: AnsiString): AnsiString;
var
Ch : AnsiChar;
L, I : Integer;
Source, Dest: PAnsiChar;
begin
L := Length(S);
if L = 0 then
Result := ''
else begin
SetLength(Result, L);
Source := Pointer(S);
Dest := Pointer(Result);
for I := 1 to L do begin
Ch := Source^;
if Ch in ['a'..'z'] then Dec(Ch, 32);
Dest^ := Ch;
Inc(Source);
Inc(Dest);
end;
end;
end;
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