Using RingLibCurl

In this chapter we will learn about using RingLibCurl

Get Request

Example:

load "libcurl.ring"

curl = curl_easy_init()

curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1)
curl_easy_setopt(curl, CURLOPT_URL, "http://ring-lang.sf.net")

curl_easy_perform(curl)

curl_easy_cleanup(curl)

Post Request

Example:

load "libcurl.ring"

curl = curl_easy_init()

cPostThis = "page=4&Number1=4&Number2=5"
curl_easy_setopt(curl, CURLOPT_URL, "http://localhost/ringapp/index.ring?page=3")
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, cPostThis)

curl_easy_perform(curl)

curl_easy_cleanup(curl)

Facebook Login

Example:

load "libcurl.ring"

see "Enter Email : " give $login_email
See "Enter Password : " give $login_pass

curl = curl_easy_init()

curl_easy_setopt(curl, CURLOPT_URL, 'https://www.facebook.com/login.php')
curl_easy_setopt(curl, CURLOPT_POSTFIELDS,'charset_test=j u s t a t e s t'+
' &email='+urlencode($login_email)+'&pass='+
urlencode($login_pass)+'&login=Login')
curl_easy_setopt(curl, CURLOPT_POST, 1)
curl_easy_setopt(curl, CURLOPT_HEADER, 0)
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1)
curl_easy_setopt(curl, CURLOPT_COOKIEJAR, "cookies.txt")
curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "cookies.txt")
curl_easy_setopt(curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U;"+
" Windows NT 5.1; en-US; rv:1.8.1.3) Gecko/20070309 Firefox/2.0.0.3")
curl_easy_setopt(curl, CURLOPT_REFERER, "http://www.facebook.com")
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE)
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 2)

mylist = curl_slist_append(NULL,'Accept-Charset: utf-8')
curl_slist_append(mylist,'Accept-Language: en-us,en;q=0.7,bn-bd;q=0.3')
curl_slist_append(mylist,'Accept: text/xml,application/xml,'+
'application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5')
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, mylist)

curl_easy_setopt(curl, CURLOPT_COOKIESESSION, false)

curl_easy_perform(curl)

curl_easy_cleanup(curl)

Func URLEncode cStr
        cOut = ""
        for x in cStr
                if isalnum(x)
                        cOut += x
                but x = " "
                        cOut += "+"
                else
                        cOut += "%"+str2hex(x)
                ok
        next
        return cOut

Save Output to String

Example:

load "libcurl.ring"

curl = curl_easy_init()

curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1)
curl_easy_setopt(curl, CURLOPT_URL, "http://ring-lang.sf.net")

cOutput = curl_easy_perform_silent(curl)

See "Output:" + nl
see cOutput

curl_easy_cleanup(curl)

Get Stock Data From Yahoo

Example:

Load "libcurl.ring"

### Part 1 --- Get Crumb and Cookie -----------------------------------------

See "Start curl_easy_init(): "+ nl
curl = curl_easy_init()                     ### >>> HANDLE >>> 01006BD0  CURL  0

        curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1)
        curl_easy_setopt(curl, CURLOPT_COOKIEJAR,  "cookies.txt")
        curl_easy_setopt(curl, CURLOPT_COOKIEFILE, "cookies.txt")
        curl_easy_setopt(curl, CURLOPT_URL, "https://finance.yahoo.com/quote/AMZN/history")

        ###  HTML Data >>> STDOUT Window,  Use curl_easy_perform_silent >>> String

cOutput = curl_easy_perform_silent(curl)    ### GO Get Data >>> String


###   Extract Crumb from data
###  "CrumbStore":{"crumb":"abcdefghijk"},

if cOutput != NULL

        newStr1     = substr(cOutput, substr(cOutput, '"CrumbStore":{"crumb":"' ), 48 )
                nPosS   = substr(newStr1, ':"' ) ;  ### Start of crumb -2
                nPosE   = substr(newStr1, '"}' ) ;  ### End   of crumb
                nCount  = nPosE - nPosS -2          ### size  of crumb
        myCrumb     = substr(newStr1, nPosS +2, nCount)

        See "myCrumb.: |"+ myCrumb +"|" +nl

        ### UniCode "\u002F" replace it with "/"
                if substr( myCrumb, "\u002F")
                   myCrumb = substr( myCrumb, "\u002F", "/")
                   See "myCrumb2: |"+ myCrumb +"|"+ nl
                ok

else
        See "No Connectivity to Yahoo. Looking for Cookie and Crumb." +nl +nl
ok


### Part 2 --- Send URL with Crumb, and Cookie -----------------------------------------

        ### Send URL+Crumb to Yahoo to fetch 1st stock history data,

        $url = "https://query1.finance.yahoo.com/v7/finance/download/AMZN?period1=1277856000&period2=1498777545&interval=1wk&events=history&crumb=" + myCrumb

        curl_easy_setopt(curl, CURLOPT_URL, $url);
        cStr = curl_easy_perform_silent(curl)
        See cStr

curl_easy_cleanup(curl)  ### REMEMBER to CLOSE  CURL

Output:

myCrumb.: |sEEeW97mxvN|
Date,Open,High,Low,Close,Adj Close,Volume
2010-07-05,110.650002,117.480003,109.000000,117.260002,117.260002,21000400
2010-07-12,117.809998,124.879997,117.320000,118.489998,118.489998,29407300
2010-07-19,118.379997,121.250000,105.800003,118.870003,118.870003,74252100