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Can't get thumbnail from AVAsset

In my Xamarin.Forms project, I use dependency injection to call a method inside my .iOS project in order to retrieve a thumbnail of a video that the user just recorded.
Called from my Xamarin.Forms project:
byte[] thumbnailBytes = DependencyService.Get<IMediaMetaData>().ReturnVidThumbnailBytes(vid.Path);
The following code is then called from the .IOS project:
public class MediaMetaData : IMediaMetaData
{
public byte[] ReturnVidThumbnailBytes(string videoFilePath)
{
// videoFilePath example =
// /var/mobile/Containers/Data/Application/3E84C0D0-F590-4AAF-89E7-7D3BFC023E6B/Documents/temp/trim_160491789522565DC08BE-862C-4EE0-A135-BCD9236C6874.mov
//Take local url and create an AVAsset
AVAsset asset = AVAsset.FromUrl(new NSUrl(videoFilePath));
AVAssetImageGenerator assetImageGenerator = AVAssetImageGenerator.FromAsset(asset);
// Total duration of asset
CMTime actualTime = asset.Duration;
// 1/60 = 60th of a second
CMTime cmTime = new CMTime(1, 10);
NSError error;
var imageRef = assetImageGenerator.CopyCGImageAtTime(cmTime, out actualTime, out error);
if (imageRef == null)
return null;
var image = UIImage.FromImage(imageRef);
return image.AsJPEG().ToArray();
}
}
The problem:
CopyCGImageAtTime always returns null. I check the NSError and I get the following information:
Class Handle = Unable to cast object of type 'Mono.Debugger.Soft.PointerValue' to type 'Mono.Debugger.Soft.PrimitiveValue
code = -11850
Localized failure reason = The server is not correctly configured (But wait, this is a local file I'm accessing here...?)
I've not been able to find any helpful information regarding the class handle error, and the localized failure reason brings up threads from people who are trying to access videos from web services as opposed to local storage. Anyone have experience with the problem I'm having?

Programmatically retrieve list of source folders and create one if not present - C# + VSTS 2017

I am trying to automate some processes to make life a bit easier. We have multiple requests from the team to create a folder in TFS 2017 (they do not have permissions) and then set up the associated builds for that source control folder.
The build creation part I think I have a way to do, but querying our on premise TFS 2017 server to get a list of folders under a certain path is proving tricky. So far I am having trouble even connecting to the server in the first place with this :
var collectionUri = "http://tfs-server:8080/tfs/DefaultCollection/";
var teamProjectName = "MYPROJECT";
Uri uri = new Uri(collectionUri);
var clientCredentials = new VssCredentials(new WindowsCredential(new NetworkCredential("USERNAME", "PASSWORD", "COLLECTIONNAME")));
var connection = new VssConnection(uri, clientCredentials);
var sourceControlServer = connection.GetClient<TfvcHttpClient>();
That throws an exception : Error converting value "System.Security.Principal.WindowsIdentity;" to type 'Microsoft.VisualStudio.Services.Identity.IdentityDescriptor'
Can someone help me to get connected to the server first please! Documentation on this is very hard to find, and I dont see any examples that actually work.
What I was going to look at next was creating the folder if it doesn't exist. No idea how to do that yet, maybe using
sourceControlServer.GetBranchAsync(teamProjectName + FolderName);
Thanks!
EDIT:
Ok I got it to not error creating the connection by doing this instead :
Uri uri = new Uri("http://tfs-server:8080/tfs/DefaultCollection/");
var clientCredentials = new VssCredentials(new WindowsCredential(new NetworkCredential("USERNAME", "PASSWORD", "DOMAIN")));
var buildServer = new BuildHttpClient(uri, clientCredentials);
var sourceControlServer = new TfvcHttpClient(uri, clientCredentials);
So now to just figure out how to list and create folders from TFS and to create builds!
EDIT:
So I have got the querying working, so I can check if a folder exists under a path like this :
var teamProjectName = "USA";
Uri uri = new Uri("http://tfs-server:8080/tfs/DefaultCollection/");
var clientCredentials = new VssCredentials(new WindowsCredential(new NetworkCredential("USERNAME", "PASSWORD", "DOMAIN")));
TfvcHttpClient sourceControlServer = new TfvcHttpClient(uri, clientCredentials);
List<TfvcItem> branchItems;
using (sourceControlServer) {
branchItems = sourceControlServer.GetItemsAsync("$/USA/Development/NewFolder", VersionControlRecursionType.OneLevel).Result;
}
return branchItems.Count > 0;
That will find all the items under that folder. So if there isnt a folder, it will return 0, so I can go ahead and create that folder.
So next problem, is how to create the folder. Using CreateChangesetAsync.

Update:
To use Client API and CreateChangesetAsync method to create files in TFVC, you could refer below sample console app:
using Microsoft.TeamFoundation.SourceControl.WebApi;
using Microsoft.VisualStudio.Services.Common;
using Microsoft.VisualStudio.Services.WebApi;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp1
{
internal class Program
{
internal static async Task Main(string[] args)
{
var orgUrl = new Uri(args[0]);
string serverPath = args[1];
string localPath = args[2];
string contentType = args[3];
string pat = args[4];
var changes = new List<TfvcChange>()
{
new TfvcChange()
{
ChangeType = VersionControlChangeType.Add,
Item = new TfvcItem()
{
Path = serverPath,
ContentMetadata = new FileContentMetadata()
{
Encoding = Encoding.UTF8.WindowsCodePage,
ContentType = contentType,
}
},
NewContent = new ItemContent()
{
Content = Convert.ToBase64String(File.ReadAllBytes(localPath)),
ContentType = ItemContentType.Base64Encoded
}
}
};
var changeset = new TfvcChangeset()
{
Changes = changes,
Comment = $"Added {serverPath} from {localPath}"
};
var connection = new VssConnection(orgUrl, new VssBasicCredential(string.Empty, pat));
var tfvcClient = connection.GetClient<TfvcHttpClient>();
await tfvcClient.CreateChangesetAsync(changeset);
}
}
}
Besides, instead of using tf command line, please kindly check solution here:
C# TFS API: show project structure with folders and files, including their ChangeType (checked out, deleted,renamed) like in visual studio

Azure DevOps: Wiki page with WikiHttpClient not found

I created a project wiki in Azure DevOps and want to get the wiki markdown pages in my .NET application. When using the link
https://dev.azure.com/company/project/_apis/wiki/wikis/KIS.wiki/pages/News
The markdown gets shown in the browser. When I try to do that in code, I am getting
"Wiki page ‘/News/_apis/connectionData’ could not be found. Ensure that the path of the page is correct and the page exists."
My code looks like this:
var url = new Uri("https://dev.azure.com/company/project/_apis/wiki/wikis/KIS.wiki/pages/News");
var personalAccessToken = "xxxxxxxxxxxxxxxx";
var credentials = new VssCredentials(new VssBasicCredential("", personalAccessToken));
using (var connection = new VssConnection(url, credentials))
{
var wikiClient = connection.GetClient<WikiHttpClient>();
var markdown = wikiClient.GetWikiAsync("KIS.wiki").Result;
}
The error appears on GetClient().
What am I doing wrong?

I see a couple problems with how you're trying to get the page content.
The url given to the connection should be the "project base path"
private static string BasePath = $"https://dev.azure.com/{Organization}";
You're using the GetWikiAsync(...) method when you want to be using the GetPageAsync(...) method
Here's an example
private readonly IVssCredentialsFactory _credentialsFactory;
private const string ApiVersion = "5.1";
private static string BasePath = $"https://dev.azure.com/{Organization}";
private const string Organization = "company";
private const string Project = "project";
public AzureRepository(IVssCredentialsFactory credentialsFactory)
{
_credentialsFactory = credentialsFactory;
}
public void GetWikiPage()
{
using (var connection = new VssConnection(new Uri(BasePath), _credentialsFactory.GetCredentials()))
{
var wikiClient = connection.GetClient<WikiHttpClient>();
var wikiId = "KIS.wiki";
var path = "/News";
var page = wikiClient.GetPageAsync(Project, wikiId, path, includeContent : true).Result;
var content = page.Page.Content;
}
}
notes about this sample:
IVssCredentialsFactory is my creation, so don't look for it in the lib
The injection of the factory is were the PAT or oAuth token is, so don't think you're doing anything wrong there. You're not.
I hope it's obvious that the method isn't doing anything with the result, b/c let's face it, it's a sample.
If you're not already
You should look at the c# client samples. It's not exhaustive, but can be helpful.

PlanGrid API - Publish Log still prompts for version set name after UploadVersion

I'm trying to post a file to my PlanGrid project using the following code. Once the upload is complete, I log into the website, open the Publish Log, then click on "Publish Your Sheets", at which point it asks me again to define version set. Can someone clarify what the UploadVersionRequest.VersionName property is used for then?
public static async Task Upload(string project_uid, string filename, Stream payload)
{
var api = PlanGridClient.Create(Properties.Settings.Default.ApiKey);
var versionRequest = new UploadVersionRequest
{
NumberOfFiles = 1,
VersionName = "MyVersion" // how does this get used??
};
var versionUpload = await api.UploadVersion(project_uid, versionRequest);
foreach (var fileUploadRequest in versionUpload.FileUploadRequests)
{
var uploadFile = new UploadFile
{
FileName = filename
};
var fileUpload = await api.UploadFileToVersion(project_uid, versionUpload.Uid, fileUploadRequest.Uid, uploadFile);
await api.Upload<object>(fileUpload, payload);
}
await api.CompleteVersionUpload(project_uid, versionUpload.Uid);
}

Thanks for the question. We released an update to the upload process that included both version name and issue date. That change has not been reflected in the API, so when you set the version name in the API, it is not reflected during the publishing process.

uploading image to azure blob storage

I know this question can be interpreted as a duplicate, but I can simply not get the blop service working. I have followed the standard example on msdn. I have implemented in my code but followed the example. I can get my MobileService, with the supplied script in the example, to insert a blob with open properties. I then use this code to upload an image to the blob storage:
BitmapImage bi = new BitmapImage();
MemoryStream stream = new MemoryStream();
if (bi != null)
{
WriteableBitmap bmp = new WriteableBitmap((BitmapSource)bi);
bmp.SaveJpeg(stream, bmp.PixelWidth, bmp.PixelHeight, 0, 100);
}
if (!string.IsNullOrEmpty(uploadImage.SasQueryString))
{
// Get the URI generated that contains the SAS
// and extract the storage credentials.
StorageCredentials cred = new StorageCredentials(uploadImage.SasQueryString);
var imageUri = new Uri(uploadImage.ImageUri);
// Instantiate a Blob store container based on the info in the returned item.
CloudBlobContainer container = new CloudBlobContainer(
new Uri(string.Format("https://{0}/{1}",
imageUri.Host, uploadImage.ContainerName)), cred);
// Upload the new image as a BLOB from the stream.
CloudBlockBlob blobFromSASCredential = container.GetBlockBlobReference(uploadImage.ResourceName);
await blobFromSASCredential.UploadFromStreamAsync(stream);//error!
// When you request an SAS at the container-level instead of the blob-level,
// you are able to upload multiple streams using the same container credentials.
stream = null;
}
I am getting an error in this code at the point marked error, with the following error:
+ ex {Microsoft.WindowsAzure.Storage.StorageException: The remote server returned an error: NotFound. ---> System.Net.WebException: The remote server returned an error: NotFound. ---> System.Net.WebException: The remote server returned an error: NotFound.
Which I do not understand since the code that returns the string from the script is:
// Generate the upload URL with SAS for the new image.
var sasQueryUrl = blobService.generateSharedAccessSignature(item.containerName,
item.resourceName, sharedAccessPolicy);
// Set the query string.
item.sasQueryString = qs.stringify(sasQueryUrl.queryString);
// Set the full path on the new new item,
// which is used for data binding on the client.
item.imageUri = sasQueryUrl.baseUrl + sasQueryUrl.path;
Of course this also depicts that I do not completely grasp the construction of the blob storage. And therefore any help would be appreciated.
Comment elaborations
From the server code it should create a public note for at least 5 minutes. And therefore not be an issue. My server script is the same as the link. But replicated here:
var azure = require('azure');
var qs = require('querystring');
var appSettings = require('mobileservice-config').appSettings;
function insert(item, user, request) {
// Get storage account settings from app settings.
var accountName = appSettings.STORAGE_ACCOUNT_NAME;
var accountKey = appSettings.STORAGE_ACCOUNT_ACCESS_KEY;
var host = accountName + '.blob.core.windows.net';
if ((typeof item.containerName !== "undefined") && (
item.containerName !== null)) {
// Set the BLOB store container name on the item, which must be lowercase.
item.containerName = item.containerName.toLowerCase();
// If it does not already exist, create the container
// with public read access for blobs.
var blobService = azure.createBlobService(accountName, accountKey, host);
blobService.createContainerIfNotExists(item.containerName, {
publicAccessLevel: 'blob'
}, function(error) {
if (!error) {
// Provide write access to the container for the next 5 mins.
var sharedAccessPolicy = {
AccessPolicy: {
Permissions: azure.Constants.BlobConstants.SharedAccessPermissions.WRITE,
Expiry: new Date(new Date().getTime() + 5 * 60 * 1000)
}
};
// Generate the upload URL with SAS for the new image.
var sasQueryUrl =
blobService.generateSharedAccessSignature(item.containerName,
item.resourceName, sharedAccessPolicy);
// Set the query string.
item.sasQueryString = qs.stringify(sasQueryUrl.queryString);
// Set the full path on the new new item,
// which is used for data binding on the client.
item.imageUri = sasQueryUrl.baseUrl + sasQueryUrl.path;
} else {
console.error(error);
}
request.execute();
});
} else {
request.execute();
}
}
The idea with the pictures is that other users of the app should be able to access them. As far as I understand I have made it public, but only write public for 5 minutes. The url for the blob I save in a mobileservice table, where the user needs to be authenticated, I would like the same safety on the storage. But do not know if this is accomplished? I am sorry for all the stupid questions, but I have not been able to solve it on my own so I have to "seem" stupid :)

If someone ends up in here needing help. The problem for me was the uri. It should have been http and not https. Then there were no error uploading.
But displaying the image even on a test image control from the toolbox, did not succeed. The problem was I had to set the stream to the begining:
stream.Seek(0, SeekOrigin.Begin);
Then the upload worked and was able to retrieve the data.