(PureBasic) Get Size of File on Web Server

Demonstrates how to send a HEAD request to fetch information about a file on a web server, which hopefully includes the Content-Length in the response header.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"

Procedure ChilkatExample()

    ; This example assumes the Chilkat API to have been previously unlocked.
    ; See Global Unlock Sample for sample code.

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    resp.i = CkHttp::ckGetHead(http,"https://nodejs.org/dist/v10.16.1/node-v10.16.1-win-x64.zip")
    If CkHttp::ckLastMethodSuccess(http) = 0
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    ; Examine the response header.
    Debug CkHttpResponse::ckHeader(resp)

    ; Here is a sample response header:

    ; Date: Thu, 01 Aug 2019 12:47:27 GMT
    ; Content-Type: application/zip
    ; Content-Length: 17457922
    ; Connection: keep-alive
    ; Set-Cookie: __cfduid=da5b78dcdd8171683c5a578eb9c9f88c81564663647; expires=Fri, 31-Jul-20 12:47:27 GMT; path=/; domain=.nodejs.org; HttpOnly
    ; Last-Modified: Wed, 31 Jul 2019 18:21:57 GMT
    ; ETag: "5d41dc45-10a6302"
    ; Accept-Ranges: bytes
    ; Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
    ; Server: cloudflare
    ; CF-RAY: 4ff7ebb32ac4e1e2-ORD

    ; Get the Content-Length header.
    contentLengthStr.s = CkHttpResponse::ckGetHeaderField(resp,"Content-Length")
    ; If the header exists...
    If CkHttpResponse::ckLastMethodSuccess(resp) = 1
        Debug "Content-Length: " + contentLengthStr
        ; Your application can convert the contentLengthStr to an integer and then use it....
    EndIf

    CkHttpResponse::ckDispose(resp)



    CkHttp::ckDispose(http)


    ProcedureReturn
EndProcedure