Title: CNPJ and CPF Validation
Question: How to validade CNPJ or CPF.
Answer:
In Brazil every people has a ID called CPF(Cadastro de pessoa fsica) and every company has a ID called CNPJ(Cadastro nacional de pessoa jurdica). Some times we need to validate those IDs.
Ps.: This function uses a function from JCL(StrKeepChars), this functions just remove other chars than numbers.
! UPDATED !
function CheckCNPJ (Numero: String): Boolean;
var
i, j, k, Soma, Digito: integer;
IsCNPJ: Boolean;
NumeroVerifica: String;
begin
Numero := StrKeepChars(Numero,['0'..'9']);
IsCNPJ := (Length(Numero) = 14);
NumeroVerifica := Copy(Numero, 0, Length(Numero)-2);
for j := 1 to 2 do begin
k := 2;
Soma := 0;
for i := Length(NumeroVerifica) downto 1 do begin
Soma := Soma + (Ord(NumeroVerifica[i])-Ord('0'))*k;
Inc(k);
if (k 9) and IsCNPJ then k := 2;
end;
Digito := 11 - Soma mod 11;
if Digito = 10 then
Digito := 0;
NumeroVerifica := NumeroVerifica + Chr(Digito + Ord('0'));
end;
Result := (NumeroVerifica = Numero);
end;