|
Chilkat • HOME • .NET Core C# • Android™ • AutoIt • C • C# • C++ • Chilkat2-Python • CkPython • Classic ASP • DataFlex • Delphi ActiveX • Delphi DLL • Go • Java • Lianja • Mono C# • Node.js • Objective-C • PHP ActiveX • PHP Extension • Perl • PowerBuilder • PowerShell • PureBasic • Ruby • SQL Server • Swift 2 • Swift 3,4,5... • Tcl • Unicode C • Unicode C++ • VB.NET • VBScript • Visual Basic 6.0 • Visual FoxPro • Xojo Plugin
(Visual FoxPro) Facebook Download all Photos to Local FilesDemonstrates how to download all of one's Facebook photos to a local filesystem directory. This sample code keeps a local cache to avoid re-downloading the same photos twice. The program can be run again after a time, and it will download only photos that haven't yet been downloaded.
LOCAL loFbCache LOCAL loOauth2 LOCAL loRest LOCAL lnSuccess LOCAL lcResponseJson LOCAL loPhotoJson LOCAL loSaPhotoUrls LOCAL loSbPhotoIdPath LOCAL loJson LOCAL i LOCAL lcPhotoId LOCAL lcImageUrl LOCAL lcAfterCursor LOCAL lnNumItems LOCAL lcPhotoJsonStr LOCAL loImgUrlJson LOCAL loHttp LOCAL lnNumUrls LOCAL loUrlJson LOCAL loImageBytes LOCAL loFac LOCAL loSbImageUrl LOCAL lcExtension LOCAL loSbLocalFilePath * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * This example will use a local disk cache to avoid re-fetching the same * photo id after it's been fetched once. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Cache') loFbCache = CreateObject('Chilkat.Cache') * The cache will use 1 level of 256 sub-directories. loFbCache.Level = 1 * Use a directory path that makes sense on your operating system.. loFbCache.AddRoot("C:/fbCache") * This example assumes a previously obtained an access token * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.OAuth2') loOauth2 = CreateObject('Chilkat.OAuth2') loOauth2.AccessToken = "FACEBOOK-ACCESS-TOKEN" * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest') loRest = CreateObject('Chilkat.Rest') * Connect to Facebook. lnSuccess = loRest.Connect("graph.facebook.com",443,1,1) IF (lnSuccess <> 1) THEN ? loRest.LastErrorText RELEASE loFbCache RELEASE loOauth2 RELEASE loRest CANCEL ENDIF * Provide the authentication credentials (i.e. the access key) loRest.SetAuthOAuth2(loOauth2) * There are two choices: * We can choose to download the photos the person is tagged in or has uploaded * by setting type to "tagged" or "uploaded". loRest.AddQueryParam("type","uploaded") * To download all photos, we begin with an outer loop that iterates over * the list of photo nodes in pages. Each page returned contains a list of * photo node ids. Each photo node id must be retrieved to get the download URL(s) * of the actual image. * I don't know the max limit for the number of records that can be downloaded at once. loRest.AddQueryParam("limit","100") * Get the 1st page of photos ids. * See https://developers.facebook.com/docs/graph-api/reference/user/photos/ for more information. lcResponseJson = loRest.FullRequestNoBody("GET","/v2.7/me/photos") IF (loRest.LastMethodSuccess <> 1) THEN ? loRest.LastErrorText RELEASE loFbCache RELEASE loOauth2 RELEASE loRest CANCEL ENDIF * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject') loPhotoJson = CreateObject('Chilkat.JsonObject') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringArray') loSaPhotoUrls = CreateObject('Chilkat.StringArray') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbPhotoIdPath = CreateObject('Chilkat.StringBuilder') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject') loJson = CreateObject('Chilkat.JsonObject') loJson.EmitCompact = 0 loJson.Load(lcResponseJson) * Get the "after" cursor. lcAfterCursor = loJson.StringOf("paging.cursors.after") DO WHILE loJson.LastMethodSuccess = 1 ? "-------------------" ? "afterCursor = " + lcAfterCursor * For each photo id in this page... i = 0 lnNumItems = loJson.SizeOfArray("data") DO WHILE i < lnNumItems loJson.I = i lcPhotoId = loJson.StringOf("data[i].id") ? "photoId = " + lcPhotoId * We need to fetch the JSON for this photo. Check to see if it's in the local disk cache, * and if not, then get it from Facebook. lcPhotoJsonStr = loFbCache.FetchText(lcPhotoId) IF (loFbCache.LastMethodSuccess = 0) THEN * It's not locally available, so get it from Facebook.. loSbPhotoIdPath.Clear() loSbPhotoIdPath.Append("/v2.7/") loSbPhotoIdPath.Append(lcPhotoId) loRest.ClearAllQueryParams() loRest.AddQueryParam("fields","id,album,images") ? "Fetching photo node from Facebook..." * This REST request will continue using the existing connection. * If the connection was closed, it will automatically reconnect to send the request. lcPhotoJsonStr = loRest.FullRequestNoBody("GET",loSbPhotoIdPath.GetAsString()) IF (loRest.LastMethodSuccess <> 1) THEN ? loRest.LastErrorText RELEASE loFbCache RELEASE loOauth2 RELEASE loRest RELEASE loPhotoJson RELEASE loSaPhotoUrls RELEASE loSbPhotoIdPath RELEASE loJson CANCEL ENDIF * Add the photo JSON to the local cache. loFbCache.SaveTextNoExpire(lcPhotoId,"",lcPhotoJsonStr) ENDIF * Parse the photo JSON and add the main photo download URL to saPhotoUrls * There may be multiple URLs in the images array, but the 1st one is the largest and main photo URL. * The others are smaller sizes of the same photo. loPhotoJson.Load(lcPhotoJsonStr) lcImageUrl = loPhotoJson.StringOf("images[0].source") IF (loPhotoJson.LastMethodSuccess = 1) THEN * Actually, we'll add a small JSON document that contains both the image ID and the URL. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject') loImgUrlJson = CreateObject('Chilkat.JsonObject') loImgUrlJson.AppendString("id",lcPhotoId) loImgUrlJson.AppendString("url",lcImageUrl) loSaPhotoUrls.Append(loImgUrlJson.Emit()) ? "imageUrl = " + lcImageUrl ENDIF i = i + 1 ENDDO * Prepare for getting the next page of photos ids. * We can continue using the same REST object. * If already connected, we'll continue using the existing connection. * Otherwise, a new connection will automatically be made if needed. loRest.ClearAllQueryParams() loRest.AddQueryParam("type","uploaded") loRest.AddQueryParam("limit","20") loRest.AddQueryParam("after",lcAfterCursor) * Get the next page of photo ids. lcResponseJson = loRest.FullRequestNoBody("GET","/v2.7/me/photos") IF (loRest.LastMethodSuccess <> 1) THEN ? loRest.LastErrorText RELEASE loFbCache RELEASE loOauth2 RELEASE loRest RELEASE loPhotoJson RELEASE loSaPhotoUrls RELEASE loSbPhotoIdPath RELEASE loJson RELEASE loImgUrlJson CANCEL ENDIF loJson.Load(lcResponseJson) lcAfterCursor = loJson.StringOf("paging.cursors.after") ENDDO ? "No more pages of photos." * Now iterate over the photo URLs and download each to a file. * We can use Chilkat HTTP. No Facebook authorization (access token) is required to download * the photo once the URL is known. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http') loHttp = CreateObject('Chilkat.Http') * We'll cache the image data so that if run again, we don't re-download the same image again. lnNumUrls = loSaPhotoUrls.Count i = 0 * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject') loUrlJson = CreateObject('Chilkat.JsonObject') * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.FileAccess') loFac = CreateObject('Chilkat.FileAccess') DO WHILE i < lnNumUrls loUrlJson.Load(loSaPhotoUrls.GetString(i)) lcPhotoId = loUrlJson.StringOf("id") lcImageUrl = loUrlJson.StringOf("url") * Check the local cache for the image data. * Only download and save if not already cached. loImageBytes = loFbCache.FetchFromCache(lcImageUrl) IF (loFbCache.LastMethodSuccess = 0) THEN * This photo needs to be downloaded. * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbImageUrl = CreateObject('Chilkat.StringBuilder') loSbImageUrl.Append(lcImageUrl) * Let's form a filename.. lcExtension = ".jpg" IF (loSbImageUrl.Contains(".gif",0) = 1) THEN lcExtension = ".gif" ENDIF IF (loSbImageUrl.Contains(".png",0) = 1) THEN lcExtension = ".png" ENDIF IF (loSbImageUrl.Contains(".tiff",0) = 1) THEN lcExtension = ".tiff" ENDIF IF (loSbImageUrl.Contains(".bmp",0) = 1) THEN lcExtension = ".bmp" ENDIF * For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder') loSbLocalFilePath = CreateObject('Chilkat.StringBuilder') loSbLocalFilePath.Append("C:/Photos/facebook/uploaded/") loSbLocalFilePath.Append(lcPhotoId) loSbLocalFilePath.Append(lcExtension) loImageBytes = loHttp.QuickGet(lcImageUrl) IF (loHttp.LastMethodSuccess <> 1) THEN ? loHttp.LastErrorText RELEASE loFbCache RELEASE loOauth2 RELEASE loRest RELEASE loPhotoJson RELEASE loSaPhotoUrls RELEASE loSbPhotoIdPath RELEASE loJson RELEASE loImgUrlJson RELEASE loHttp RELEASE loUrlJson RELEASE loFac RELEASE loSbImageUrl RELEASE loSbLocalFilePath CANCEL ENDIF * We've downloaded the photo image bytes into memory. * Save it to the cache AND save it to the output file. loFbCache.SaveToCacheNoExpire(lcImageUrl,"",loImageBytes) loFac.WriteEntireFile(loSbLocalFilePath.GetAsString(),loImageBytes) ? "Downloaded to " + loSbLocalFilePath.GetAsString() ENDIF i = i + 1 ENDDO ? "Finished downloading all Facebook photos!" RELEASE loFbCache RELEASE loOauth2 RELEASE loRest RELEASE loPhotoJson RELEASE loSaPhotoUrls RELEASE loSbPhotoIdPath RELEASE loJson RELEASE loImgUrlJson RELEASE loHttp RELEASE loUrlJson RELEASE loFac RELEASE loSbImageUrl RELEASE loSbLocalFilePath |
||||
© 2000-2024 Chilkat Software, Inc. All Rights Reserved.