B4X

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. B4X

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 ChilkatHttp
http.Initialize("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 ChilkatJsonObject
queryParams.Initialize
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 ChilkatHttpResponse
resp.Initialize
success = http.HttpParams("GET", "https://api.qrserver.com/v1/create-qr-code/", queryParams, resp)
If success = False Then
    Log(http.LastErrorText)
    Return
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...)
    Log(resp.BodyStr)
    Log("Response status = " & resp.StatusCode)
    Log("Failed.")
    Return
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 ChilkatBinData
bd.Initialize
resp.GetBodyBd(bd)
'  Use the bytes in bd...
'  See the online reference documentation for the function to access the bytes directly.

Log("Success.")