(VBScript) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

' 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
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.OAuth2")
set oauth2 = CreateObject("Chilkat.OAuth2")
oauth2.AccessToken = "FACEBOOK-ACCESS-TOKEN"

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Rest")
set rest = CreateObject("Chilkat.Rest")

' Connect to Facebook...
success = rest.Connect("graph.facebook.com",443,1,1)
If (success <> 1) Then
    outFile.WriteLine(rest.LastErrorText)
    WScript.Quit
End If

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

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbPath = CreateObject("Chilkat.StringBuilder")
success = sbPath.Append("/v2.7/")
success = 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/
success = rest.AddQueryParam("fields","id,album,images")

responseJson = rest.FullRequestNoBody("GET",sbPath.GetAsString())
If (rest.LastMethodSuccess <> 1) Then
    outFile.WriteLine(rest.LastErrorText)
    WScript.Quit
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = CreateObject("Chilkat.JsonObject")
json.EmitCompact = 0
success = json.Load(responseJson)

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

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

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbImageUrl = CreateObject("Chilkat.StringBuilder")
success = sbImageUrl.Append(imageUrl)

' Build the output local file path.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbToPath = CreateObject("Chilkat.StringBuilder")
success = sbToPath.Append("qa_output/fb")
success = sbToPath.Append(json.StringOf("id"))
bCaseSensitive = 0
If (sbImageUrl.Contains(".jpg",bCaseSensitive) = 1) Then
    success = sbToPath.Append(".jpg")
Else
    success = sbToPath.Append(".png")
End If

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

' Download using Chilkat HTTP.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Http")
set http = CreateObject("Chilkat.Http")
success = http.Download(imageUrl,sbToPath.GetAsString())
If (success <> 1) Then
    outFile.WriteLine(http.LastErrorText)
Else
    outFile.WriteLine("Downloaded.")
End If


outFile.Close