Created
February 13, 2014 23:03
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Classe feita em Delphi para recuperar a cotação de algumas moedas estrangeiras baseada nas versões brasileiras do site CashCash.cc
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program TesteCotacao; | |
{$APPTYPE CONSOLE} | |
{$R *.res} | |
uses | |
System.SysUtils, | |
Utils.Cotacao in 'Utils.Cotacao.pas'; | |
var | |
oCotacao : TCotacao; | |
begin | |
oCotacao := TCotacao.Create; | |
try | |
Writeln('Hoje estamos com as seguintes contações de moedas estrangeiras'); | |
Writeln(Format('Dolar: R$%f',[oCotacao.Dolar()])); | |
Writeln(Format('Euro: R$%f',[oCotacao.Euro()])); | |
Writeln(Format('Libra: R$%f',[oCotacao.Libra()])); | |
finally | |
oCotacao.Free; | |
end; | |
write('Pressione ENTER para sair...'); | |
Readln; | |
end. |
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unit Utils.Cotacao; | |
interface | |
uses | |
IdHTTP; | |
type | |
TCotacao = class | |
strict private | |
FHTTP : TIdHTTP; | |
function GetCotacao(const AUrl : string; ARegEx : string = 'nacional"[ ]+value="([0-9,]+)'):Real; | |
public | |
constructor Create; | |
destructor Free; | |
function Dolar():Real; | |
function Euro():Real; | |
function Libra():Real; | |
end; | |
implementation | |
uses | |
RegularExpressions, | |
Classes, System.SysUtils; | |
{ TCotacao } | |
constructor TCotacao.Create; | |
begin | |
Self.FHTTP := TIdHTTP.Create(nil); | |
end; | |
function TCotacao.GetCotacao(const AUrl: string; ARegEx: string = 'nacional"[ ]+value="([0-9,]+)'): Real; | |
var | |
ssResponse : TStringStream; | |
rMatch : TMatch; | |
begin | |
Result := 0; | |
ssResponse := TStringStream.Create(); | |
try | |
Self.FHTTP.Get(AUrl,ssResponse); | |
rMatch := TRegEx.Match(ssResponse.DataString,ARegEx,[roMultiLine]); | |
if rMatch.Success then | |
Result := StrToFloat(rMatch.Groups.Item[1].Value); | |
finally | |
ssResponse.Free; | |
end; | |
end; | |
function TCotacao.Libra: Real; | |
begin | |
Result := Self.GetCotacao('http://librahoje.com/'); | |
end; | |
function TCotacao.Dolar: Real; | |
begin | |
Result := Self.GetCotacao('http://dolarhoje.com/'); | |
end; | |
function TCotacao.Euro: Real; | |
begin | |
Result := Self.GetCotacao('http://eurohoje.com/'); | |
end; | |
destructor TCotacao.Free; | |
begin | |
Self.FHTTP.Free; | |
end; | |
end. |
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