Tcl

Finnhub API - Get Stock Quote

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Demonstrates how to get a stock quote from the Finnhub API. Tcl

load ./chilkat.dll

set success 0

# Replace with your actual Finnhub API key.
set apiKey "YOUR_FINNHUB_API_KEY"
set symbol "AAPL"

set http [new_CkHttp]

# This is the URL without params.
set urlWithoutParams "https://finnhub.io/api/v1/quote"

set req [new_CkHttpRequest]

# Add params that will be sent in the URL.
CkHttpRequest_AddParam $req "symbol" $symbol
CkHttpRequest_AddParam $req "token" $apiKey

CkHttpRequest_put_HttpVerb $req "GET"

# Send the request to get the JSON response.
set resp [new_CkHttpResponse]

set success [CkHttp_HttpReq $http $urlWithoutParams $req $resp]
if {$success == 0} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkHttp $http
    delete_CkHttpRequest $req
    delete_CkHttpResponse $resp
    exit
}

set json [new_CkJsonObject]

CkHttpResponse_GetBodyJson $resp $json

set statusCode [CkHttpResponse_get_StatusCode $resp]
puts "response status code: $statusCode"

CkJsonObject_put_EmitCompact $json 0
puts [CkJsonObject_emit $json]

# Sample result:

# {
#   "c": 248.8,
#   "d": -4.09,
#   "dp": -1.6173,
#   "h": 255.493,
#   "l": 248.07,
#   "o": 253.9,
#   "pc": 252.89,
#   "t": 1774641600
# }

if {$statusCode == 200} then {
    # Add the symbol to the top of the result.
    CkJsonObject_AddStringAt $json 0 "symbol" $symbol

    # Rename members for clarification.
    CkJsonObject_Rename $json "c" "currentPrice"
    CkJsonObject_Rename $json "d" "change"
    CkJsonObject_Rename $json "dp" "percentChange"
    CkJsonObject_Rename $json "h" "high"
    CkJsonObject_Rename $json "l" "low"
    CkJsonObject_Rename $json "o" "open"
    CkJsonObject_Rename $json "pc" "prevClose"
    CkJsonObject_Rename $json "t" "unixTime"

    puts [CkJsonObject_emit $json]

} else {
    puts "Failed"
}


delete_CkHttp $http
delete_CkHttpRequest $req
delete_CkHttpResponse $resp
delete_CkJsonObject $json