VB.NET

QR Code Generator via api.qrserver.com REST API

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

Dim success As Boolean = False

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

Dim http As New Chilkat.Http

' 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]

Dim queryParams As New Chilkat.JsonObject
queryParams.UpdateString("data","Hello World")
queryParams.UpdateString("size","100x100")

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

' Send the GET request to an endpoint.
' Chilkat will add the url-encoded query params passed in the JSON.
Dim resp As New Chilkat.HttpResponse
success = http.HttpParams("GET","https://api.qrserver.com/v1/create-qr-code/",queryParams,resp)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


' Did it succeed?
If (resp.StatusCode <> 200) Then
    ' The response body, if anything, would not be the image data, but would likely be the error text (or HTML, or whatever...)
    Debug.WriteLine(resp.BodyStr)
    Debug.WriteLine("Response status = " & resp.StatusCode)
    Debug.WriteLine("Failed.")
    Exit Sub
End If


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

' Or get the bytes:
Dim bd As New Chilkat.BinData
resp.GetBodyBd(bd)
' Use the bytes in bd...
' See the online reference documentation for the function to access the bytes directly.

Debug.WriteLine("Success.")