Conversor de divisas utilizando la API de Google

? ConvertirDivisa(1, "USD", "ARS")  && 1 US Dolar -> Peso de Argentina 
? ConvertirDivisa(10, "EUR", "ARS")  && 10 Euros -> Peso de Argentina
? ConvertirDivisa(100, "ARS", "USD") && 100 Pesos de Argentina -> US Dolar

FUNCTION ConvertirDivisa(pnMonto, plFrom, plTo)
  LOCAL lc, lcUrl, la(1)
  DECLARE LONG URLDownloadToFile IN URLMON.DLL ;
    LONG, STRING, STRING, LONG, LONG
  ERASE "cambio.txt"
  lcURL = "https://www.google.com/finance/converter?a="+TRANSFORM(pnMonto)+"&from="+ plFROM +"&to=" + plTO
  IF 0 = URLDownloadToFile(0, lcURL, "cambio.txt", 0, 0)
    TRY
      INKEY(1)
      lc = FILETOSTR("cambio.txt")
      ALINES(la,lc,1,"<div id=currency_converter_result>")
      lc=la(2)
      ALINES(la,lc,1,"</span>")
      lc = STRTRAN(la(1),"<span class=bld>", "")
    CATCH
      lc =  "Error de divisas"
    ENDTRY
  ELSE
    lc =  "No hay conexion"
  ENDIF
  RETURN lc
ENDFUNC

Los códigos válidos de las distintas divisas están en la siguiente tabla:

AED = United Arab Emirates Dirham (AED)
AFN = Afghan Afghani (AFN)
ALL = Albanian Lek (ALL)
AMD = Armenian Dram (AMD)
ANG = Netherlands Antillean Guilder (ANG)
AOA = Angolan Kwanza (AOA)
ARS = Argentine Peso (ARS)
AUD = Australian Dollar (A$)
AWG = Aruban Florin (AWG)
AZN = Azerbaijani Manat (AZN)
BAM = Bosnia-Herzegovina Convertible Mark (BAM)
BBD = Barbadian Dollar (BBD)
BDT = Bangladeshi Taka (BDT)
BGN = Bulgarian Lev (BGN)
BHD = Bahraini Dinar (BHD)
BIF = Burundian Franc (BIF)
BMD = Bermudan Dollar (BMD)
BND = Brunei Dollar (BND)
BOB = Bolivian Boliviano (BOB)
BRL = Brazilian Real (R$)
BSD = Bahamian Dollar (BSD)
BTC = Bitcoin (฿)
BTN = Bhutanese Ngultrum (BTN)
BWP = Botswanan Pula (BWP)
BYR = Belarusian Ruble (BYR)
BZD = Belize Dollar (BZD)
CAD = Canadian Dollar (CA$)
CDF = Congolese Franc (CDF)
CHF = Swiss Franc (CHF)
CLF = Chilean Unit of Account (UF) (CLF)
CLP = Chilean Peso (CLP)
CNH = CNH (CNH)
CNY = Chinese Yuan (CN¥)
COP = Colombian Peso (COP)
CRC = Costa Rican Colón (CRC)
CUP = Cuban Peso (CUP)
CVE = Cape Verdean Escudo (CVE)
CZK = Czech Republic Koruna (CZK)
DEM = German Mark (DEM)
DJF = Djiboutian Franc (DJF)
DKK = Danish Krone (DKK)
DOP = Dominican Peso (DOP)
DZD = Algerian Dinar (DZD)
EGP = Egyptian Pound (EGP)
ERN = Eritrean Nakfa (ERN)
ETB = Ethiopian Birr (ETB)
EUR = Euro (€)
FIM = Finnish Markka (FIM)
FJD = Fijian Dollar (FJD)
FKP = Falkland Islands Pound (FKP)
FRF = French Franc (FRF)
GBP = British Pound (£)
GEL = Georgian Lari (GEL)
GHS = Ghanaian Cedi (GHS)
GIP = Gibraltar Pound (GIP)
GMD = Gambian Dalasi (GMD)
GNF = Guinean Franc (GNF)
GTQ = Guatemalan Quetzal (GTQ)
GYD = Guyanaese Dollar (GYD)
HKD = Hong Kong Dollar (HK$)
HNL = Honduran Lempira (HNL)
HRK = Croatian Kuna (HRK)
HTG = Haitian Gourde (HTG)
HUF = Hungarian Forint (HUF)
IDR = Indonesian Rupiah (IDR)
IEP = Irish Pound (IEP)
ILS = Israeli New Sheqel (₪)
INR = Indian Rupee (Rs.)
IQD = Iraqi Dinar (IQD)
IRR = Iranian Rial (IRR)
ISK = Icelandic Króna (ISK)
ITL = Italian Lira (ITL)
JMD = Jamaican Dollar (JMD)
JOD = Jordanian Dinar (JOD)
JPY = Japanese Yen (¥)
KES = Kenyan Shilling (KES)
KGS = Kyrgystani Som (KGS)
KHR = Cambodian Riel (KHR)
KMF = Comorian Franc (KMF)
KPW = North Korean Won (KPW)
KRW = South Korean Won (₩)
KWD = Kuwaiti Dinar (KWD)
KYD = Cayman Islands Dollar (KYD)
KZT = Kazakhstani Tenge (KZT)
LAK = Laotian Kip (LAK)
LBP = Lebanese Pound (LBP)
LKR = Sri Lankan Rupee (LKR)
LRD = Liberian Dollar (LRD)
LSL = Lesotho Loti (LSL)
LTL = Lithuanian Litas (LTL)
LVL = Latvian Lats (LVL)
LYD = Libyan Dinar (LYD)
MAD = Moroccan Dirham (MAD)
MDL = Moldovan Leu (MDL)
MGA = Malagasy Ariary (MGA)
MKD = Macedonian Denar (MKD)
MMK = Myanmar Kyat (MMK)
MNT = Mongolian Tugrik (MNT)
MOP = Macanese Pataca (MOP)
MRO = Mauritanian Ouguiya (MRO)
MUR = Mauritian Rupee (MUR)
MVR = Maldivian Rufiyaa (MVR)
MWK = Malawian Kwacha (MWK)
MXN = Mexican Peso (MX$)
MYR = Malaysian Ringgit (MYR)
MZN = Mozambican Metical (MZN)
NAD = Namibian Dollar (NAD)
NGN = Nigerian Naira (NGN)
NIO = Nicaraguan Córdoba (NIO)
NOK = Norwegian Krone (NOK)
NPR = Nepalese Rupee (NPR)
NZD = New Zealand Dollar (NZ$)
OMR = Omani Rial (OMR)
PAB = Panamanian Balboa (PAB)
PEN = Peruvian Nuevo Sol (PEN)
PGK = Papua New Guinean Kina (PGK)
PHP = Philippine Peso (Php)
PKG = PKG (PKG)
PKR = Pakistani Rupee (PKR)
PLN = Polish Zloty (PLN)
PYG = Paraguayan Guarani (PYG)
QAR = Qatari Rial (QAR)
RON = Romanian Leu (RON)
RSD = Serbian Dinar (RSD)
RUB = Russian Ruble (RUB)
RWF = Rwandan Franc (RWF)
SAR = Saudi Riyal (SAR)
SBD = Solomon Islands Dollar (SBD)
SCR = Seychellois Rupee (SCR)
SDG = Sudanese Pound (SDG)
SEK = Swedish Krona (SEK)
SGD = Singapore Dollar (SGD)
SHP = St. Helena Pound (SHP)
SKK = Slovak Koruna (SKK)
SLL = Sierra Leonean Leone (SLL)
SOS = Somali Shilling (SOS)
SRD = Surinamese Dollar (SRD)
STD = São Tomé & Príncipe Dobra (STD)
SVC = Salvadoran Colón (SVC)
SYP = Syrian Pound (SYP)
SZL = Swazi Lilangeni (SZL)
THB = Thai Baht (THB)
TJS = Tajikistani Somoni (TJS)
TMT = Turkmenistani Manat (TMT)
TND = Tunisian Dinar (TND)
TOP = Tongan Paʻanga (TOP)
TRY = Turkish Lira (TRY)
TTD = Trinidad & Tobago Dollar (TTD)
TWD = New Taiwan Dollar (NT$)
TZS = Tanzanian Shilling (TZS)
UAH = Ukrainian Hryvnia (UAH)
UGX = Ugandan Shilling (UGX)
USD = US Dollar ($)
UYU = Uruguayan Peso (UYU)
UZS = Uzbekistani Som (UZS)
VEF = Venezuelan Bolívar (VEF)
VND = Vietnamese Dong (₫)
VUV = Vanuatu Vatu (VUV)
WST = Samoan Tala (WST)
XAF = Central African CFA Franc (FCFA)
XCD = East Caribbean Dollar (EC$)
XDR = Special Drawing Rights (XDR)
XOF = West African CFA Franc (CFA)
XPF = CFP Franc (CFPF)
YER = Yemeni Rial (YER)
ZAR = South African Rand (ZAR)
ZMK = Zambian Kwacha (1968–2012) (ZMK)
ZMW = Zambian Kwacha (ZMW)
ZWL = Zimbabwean Dollar (2009) (ZWL)

Luis María Guayán