(Tcl) Magyar Nemzeti Bank (MNB) Get Currencies

The Magyar Nemzeti Bank (MNB) is the central bank of Hungary. In this role, its primary objective is to achieve and maintain price stability. The MNB website is available to visitors in both Hungarian and English. The MNB provides the Arfolyam (trans. Exchange Rate) API, which can be used to retrieve current and historic currency exchange rates. This service uses SOAP calls issued in XML format.

This example gets a list of currencies.

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load ./chilkat.dll

set rest [new_CkRest]

# URL: http://www.mnb.hu/arfolyamok.asmx
set bTls 0
set port 80
set bAutoReconnect 1
set success [CkRest_Connect $rest "www.mnb.hu" $port $bTls $bAutoReconnect]
if {$success != 1} then {
    puts "ConnectFailReason: [CkRest_get_ConnectFailReason $rest]"
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    exit
}

# --------------------------------------------------------------------------------
# Also see Chilkat's Online WSDL Code Generator
# to generate code and SOAP Request and Response XML for each operation in a WSDL.
# --------------------------------------------------------------------------------

set xml [new_CkXml]

CkXml_put_Tag $xml "soapenv:Envelope"
CkXml_AddAttribute $xml "xmlns:soapenv" "http://schemas.xmlsoap.org/soap/envelope/"
CkXml_AddAttribute $xml "xmlns:web" "http://www.mnb.hu/webservices/"
CkXml_UpdateChildContent $xml "soapenv:Header" ""
CkXml_UpdateChildContent $xml "soapenv:Body|web:GetCurrencies" ""

CkRest_AddHeader $rest "Content-Type" "text/xml"
CkRest_AddHeader $rest "SOAPAction" "/webservices/MNBArfolyamServiceSoap/GetCurrencies"
CkRest_AddHeader $rest "Accept" "application/xml"

set sbRequestBody [new_CkStringBuilder]

CkXml_GetXmlSb $xml $sbRequestBody
set sbResponseBody [new_CkStringBuilder]

set success [CkRest_FullRequestSb $rest "POST" "/arfolyamok.asmx" $sbRequestBody $sbResponseBody]
if {$success != 1} then {
    puts [CkRest_lastErrorText $rest]
    delete_CkRest $rest
    delete_CkXml $xml
    delete_CkStringBuilder $sbRequestBody
    delete_CkStringBuilder $sbResponseBody
    exit
}

set respStatusCode [CkRest_get_ResponseStatusCode $rest]
if {$respStatusCode >= 400} then {
    puts "Response Status Code = $respStatusCode"
    puts "Response Header:"
    puts [CkRest_responseHeader $rest]
    puts "Response Body:"
    puts [CkStringBuilder_getAsString $sbResponseBody]
    delete_CkRest $rest
    delete_CkXml $xml
    delete_CkStringBuilder $sbRequestBody
    delete_CkStringBuilder $sbResponseBody
    exit
}

puts "response status code = $respStatusCode"

set xmlResponse [new_CkXml]

CkXml_LoadSb $xmlResponse $sbResponseBody 1
puts [CkXml_getXml $xmlResponse]

# The XML response contains this:
# <?xml version="1.0" encoding="utf-8" ?>
# <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
#     <s:Body>
#         <GetCurrenciesResponse xmlns="http://www.mnb.hu/webservices/" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
#             <GetCurrenciesResult>&lt;MNBCurrencies&gt;&lt;Currencies&gt;&lt;Curr&gt;HUF&lt;/Curr&gt;&lt;Curr&gt;EUR&lt;/Curr&gt;&lt;Curr&gt;AUD&lt;/Curr&gt; ... &lt;/MNBCurrencies&gt;</GetCurrenciesResult>
#         </GetCurrenciesResponse>
#     </s:Body>
# </s:Envelope>

# Get the GetCurrenciesResult
set resultEncoded [CkXml_getChildContent $xmlResponse "s:Body|GetCurrenciesResponse|GetCurrenciesResult"]
puts "$resultEncoded"

# Entity decode the result to get XML.
set sbResult [new_CkStringBuilder]

CkStringBuilder_Append $sbResult $resultEncoded
CkStringBuilder_EntityDecode $sbResult

# Load it into XML.
set xmlResult [new_CkXml]

CkXml_LoadSb $xmlResult $sbResult 1
puts [CkXml_getXml $xmlResult]

# The result is this:

# <?xml version="1.0" encoding="utf-8" ?>
# <MNBCurrencies>
#     <Currencies>
#         <Curr>HUF</Curr>
#         <Curr>EUR</Curr>
#         <Curr>AUD</Curr>
#         <Curr>BGN</Curr>
#         <Curr>BRL</Curr>
#         <Curr>CAD</Curr>
#         <Curr>CHF</Curr>
#         <Curr>CNY</Curr>
#         <Curr>CZK</Curr>
#         <Curr>DKK</Curr>
#         <Curr>GBP</Curr>
#         <Curr>HKD</Curr>
#         <Curr>HRK</Curr>
#         <Curr>IDR</Curr>
#         <Curr>ILS</Curr>
#         <Curr>INR</Curr>
#         <Curr>ISK</Curr>
#         <Curr>JPY</Curr>
#         <Curr>KRW</Curr>
#         <Curr>MXN</Curr>
#         <Curr>MYR</Curr>
#         <Curr>NOK</Curr>
#         <Curr>NZD</Curr>
#         <Curr>PHP</Curr>
#         <Curr>PLN</Curr>
#         <Curr>RON</Curr>
#         <Curr>RSD</Curr>
#         <Curr>RUB</Curr>
#         <Curr>SEK</Curr>
#         <Curr>SGD</Curr>
#         <Curr>THB</Curr>
#         <Curr>TRY</Curr>
#         <Curr>UAH</Curr>
#         <Curr>USD</Curr>
#         <Curr>ZAR</Curr>
#         <Curr>ATS</Curr>
#         <Curr>AUP</Curr>
#         <Curr>BEF</Curr>
#         <Curr>BGL</Curr>
#         <Curr>CYN</Curr>
#         <Curr>CSD</Curr>
#         <Curr>CSK</Curr>
#         <Curr>DDM</Curr>
#         <Curr>DEM</Curr>
#         <Curr>EEK</Curr>
#         <Curr>EGP</Curr>
#         <Curr>ESP</Curr>
#         <Curr>FIM</Curr>
#         <Curr>FRF</Curr>
#         <Curr>GHP</Curr>
#         <Curr>GRD</Curr>
#         <Curr>IEP</Curr>
#         <Curr>ITL</Curr>
#         <Curr>KPW</Curr>
#         <Curr>KWD</Curr>
#         <Curr>LBP</Curr>
#         <Curr>LTL</Curr>
#         <Curr>LUF</Curr>
#         <Curr>LVL</Curr>
#         <Curr>MNT</Curr>
#         <Curr>NLG</Curr>
#         <Curr>OAL</Curr>
#         <Curr>OBL</Curr>
#         <Curr>OFR</Curr>
#         <Curr>ORB</Curr>
#         <Curr>PKR</Curr>
#         <Curr>PTE</Curr>
#         <Curr>ROL</Curr>
#         <Curr>SDP</Curr>
#         <Curr>SIT</Curr>
#         <Curr>SKK</Curr>
#         <Curr>SUR</Curr>
#         <Curr>VND</Curr>
#         <Curr>XEU</Curr>
#         <Curr>XTR</Curr>
#         <Curr>YUD</Curr>
#     </Currencies>
# </MNBCurrencies>
# 

delete_CkRest $rest
delete_CkXml $xml
delete_CkStringBuilder $sbRequestBody
delete_CkStringBuilder $sbResponseBody
delete_CkXml $xmlResponse
delete_CkStringBuilder $sbResult
delete_CkXml $xmlResult