(PureBasic) QR Code Generator via api.qrserver.com REST API

See more HTTP Examples

Demonstrates how to generate a QR code using the api.qrserver.com REST API service.

For more information, see https://goqr.me/api/doc/create-qr-code/

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkBinData.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    ; This example requires 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

    success.i

    ; Send the following GET request to get a binary response.
    ; The body of the binary response contains the image data for the QR code.
    ; https://api.qrserver.com/v1/create-qr-code/?data=[URL-encoded-text]&size=[pixels]x[pixels]

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

    CkJsonObject::ckUpdateString(queryParams,"data","Hello World")
    CkJsonObject::ckUpdateString(queryParams,"size","100x100")

    ; Get a PNG file..
    ; Possible formats are:
    ; png
    ; gif
    ; jpeg
    ; jpg
    ; svg
    ; eps
    ; Case matters.  Use lowercase.
    CkJsonObject::ckUpdateString(queryParams,"format","png")

    ; Send the GET request to an endpoint.
    ; Chilkat will add the url-encoded query params passed in the JSON.
    resp.i = CkHttp::ckQuickRequestParams(http,"GET","https://api.qrserver.com/v1/create-qr-code/",queryParams)
    If CkHttp::ckLastMethodSuccess(http) = 0
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(queryParams)
        ProcedureReturn
    EndIf

    ; Did it succeed?
    If CkHttpResponse::ckStatusCode(resp) <> 200
        ; The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
        Debug CkHttpResponse::ckBodyStr(resp)
        Debug "Response status = " + Str(CkHttpResponse::ckStatusCode(resp))
        Debug "Failed."
        CkHttpResponse::ckDispose(resp)

        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(queryParams)
        ProcedureReturn
    EndIf

    ; Success if we get here..
    ; Save the binary body as the PNG file, or you can get the bytes of the PNG..
    success = CkHttpResponse::ckSaveBodyBinary(resp,"c:/temp/qa_output/qr_code.png")

    ; Or get the bytes:
    bd.i = CkBinData::ckCreate()
    If bd.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttpResponse::ckGetBodyBd(resp,bd)
    ; Use the bytes in bd...
    ; See the online reference documentation for the function to access the bytes directly.

    CkHttpResponse::ckDispose(resp)

    Debug "Success."


    CkHttp::ckDispose(http)
    CkJsonObject::ckDispose(queryParams)
    CkBinData::ckDispose(bd)


    ProcedureReturn
EndProcedure