Chilkat Examples

ChilkatHOMEAndroid™Classic ASPCC++C#Mono C#.NET Core C#C# UWP/WinRTDataFlexDelphi ActiveXDelphi DLLVisual FoxProJavaLianjaMFCObjective-CPerlPHP ActiveXPHP ExtensionPowerBuilderPowerShellPureBasicCkPythonChilkat2-PythonRubySQL ServerSwift 2Swift 3/4TclUnicode CUnicode C++Visual Basic 6.0VB.NETVB.NET UWP/WinRTVBScriptXojo PluginNode.jsExcelGo

VB.NET UWP/WinRT Web API Examples

Primary Categories

AWS Translate
Activix CRM
Adyen
Amazon MWS
Azure Maps
Azure Monitor
Azure OAuth2
Azure Storage Accounts
Bluzone
CardConnect
ClickBank
Clickatell
Cloudfare
DocuSign
ETrade
Facebook
GeoOp
GetHarvest
Jira

MYOB
Magento
Microsoft Calendar
Microsoft Group
Microsoft Tasks and Plans
OneLogin OIDC
PayPal
Peoplevox
Populi
QuickBooks
SOAP finkok.com
Shopify
Stripe
SugarCRM
Trello
Twitter
VoiceBase
Vonage
Walmart
Xero
eBay
effectconnect

 

 

 

(VB.NET UWP/WinRT) Download Photo to a File

Assuming we have the ID of a Photo, this example demonstrates how to download the photo image data to a file.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

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

' This example assumes a previously obtained an access token
Dim oauth2 As New Chilkat.OAuth2
oauth2.AccessToken = "FACEBOOK-ACCESS-TOKEN"

Dim rest As New Chilkat.Rest

' Connect to Facebook...
Dim success As Boolean = Await rest.ConnectAsync("graph.facebook.com",443,True,True)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


' Provide the authentication credentials (i.e. the access key)
rest.SetAuthOAuth2(oauth2)

' Assumes we've already obtained a Photo ID.
Dim photoId As String = "10210199026347451"

Dim sbPath As New Chilkat.StringBuilder
sbPath.Append("/v2.7/")
sbPath.Append(photoId)

' First we're going to get the photo informaton so we can get the URL of the image file data.
' Select the fields we want.
' See https://developers.facebook.com/docs/graph-api/reference/photo/
rest.AddQueryParam("fields","id,album,images")

Dim responseJson As String = Await rest.FullRequestNoBodyAsync("GET",sbPath.GetAsString())
If (rest.LastMethodSuccess <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If


Dim json As New Chilkat.JsonObject
json.EmitCompact = False
json.Load(responseJson)

' Show the JSON in human-readable format.
Debug.WriteLine(json.Emit())

' Get the image URL.
Dim imageUrl As String = json.StringOf("images[0].source")
Debug.WriteLine("Downloading from " & imageUrl)

Dim sbImageUrl As New Chilkat.StringBuilder
sbImageUrl.Append(imageUrl)

' Build the output local file path.
Dim sbToPath As New Chilkat.StringBuilder
sbToPath.Append("qa_output/fb")
sbToPath.Append(json.StringOf("id"))
Dim bCaseSensitive As Boolean = False
If (sbImageUrl.Contains(".jpg",bCaseSensitive) = True) Then
    sbToPath.Append(".jpg")
Else
    sbToPath.Append(".png")
End If

Debug.WriteLine("Downloading to " & sbToPath.GetAsString())

' Download using Chilkat HTTP.
Dim http As New Chilkat.Http
success = Await http.DownloadAsync(imageUrl,sbToPath.GetAsString())
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
Else
    Debug.WriteLine("Downloaded.")
End If


 

© 2000-2019 Chilkat Software, Inc. All Rights Reserved.