Google Plus API C# - AccessViolationException

Question

I'm trying to reach the Google API Services (Plus Service in this case), using simple C# console application. Each time I call the API functions I'm encountering a very weird exception:

An unhandled exception of type 'System.AccessViolationException' occurred in Unknown Module.

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

This is happened when I'm getting the API endpoints like this example:

Client.People.Get("me").Execute();

Did anyone got this problem before?

EDIT:

I have downloaded the GPlus sample, and still getting the same problem, but now inside:

Oauth2Service.TokeninfoRequest request = service.Tokeninfo();

I think the common case here is about generated code classes:

1. https://code.google.com/p/google-api-dotnet-client/source/browse/20120425-1.1.4497-beta/Generated/Source/Google.Apis.Oauth2.v2.cs?repo=contrib&name=20120503-1.2.4506-beta

2. https://code.google.com/p/google-api-dotnet-client/source/browse/Current/Generated/Source/Google.Apis.Plus.v1.cs?repo=contrib&r=c757b64c06e143c8b28bda15b4ec7e6a2738d2e5

EDIT 2:

I'm attaching the stacktrace:

at Google.Apis.Plus.v1.PeopleResource.GetRequest.set_UserId(String value) at Google.Apis.Plus.v1.PeopleResource.GetRequest..ctor(IClientService service, String userId) in c:\code.google.com\google-api-dotnet-client\default_gen\Tools\Google.Apis.NuGet.Publisher\Template\Build\Google.Apis.Plus.v1.cs:line 2661 at Google.Apis.Plus.v1.PeopleResource.Get(String userId) in c:\code.google.com\google-api-dotnet-client\default_gen\Tools\Google.Apis.NuGet.Publisher\Template\Build\Google.Apis.Plus.v1.cs:line 2649 at Core.External.GoogleService.GooglePlusApplicationClient.Test() in e:\Copy\Feedly\Backend\Core.External.GooglePlus\GooglePlusApplicationClient.cs:line 34 at FeedlyTest.Program.Main(String[] args) in e:\Projects\Feedly\Backend\Testing\Program.cs:line 88

EDIT 3:

When I'm using the Ctrl+F5 combination, it's working. I read that combination is disabling the debugger. First thought, maybe in the debugger mode, the system is running at 32bit (and then can't access the memory which outside the 32bit boundary) . I tried to change the debug platform to 64bit, but it wasn't help.

Answer 1

Under Project Properties -> Build -> Platform Target: Try changing from "Any CPU" to "x86" or instead try turning on "Prefer 32-bit".

Answer 2

What sample are you using? The Google+ Quickstart sample is the newest. Also, you might find this blog post on OAuth 2 flows in .NET useful.

Note that the Google+ sample does currently work in Xamarin as well as Visual Studio, so you could try to determine whether it's your environment using the freely available IDE.

Make sure when using the quickstart that you're going to http://server:port/signin.ashx - in some configurations, the web app will default to another route.

Can you also post more information on the code you're using? For example, the following code shows a more complete example of your tokeninfo call from above:

Oauth2Service service = new Oauth2Service(
    new Google.Apis.Services.BaseClientService.Initializer());
Oauth2Service.TokeninfoRequest request = service.Tokeninfo();
request.AccessToken = token.AccessToken;

Tokeninfo info = request.Execute();

I created a very simple Google .NET Client API demo on GitHub that you can clone:

git clone https://github.com/gguuss/google-dotnet-demo

When you open the project in Visual Studio, restore the NuGet packages, build the project, and then input an access token. If everything works, the demo will show you some of the TokenInfo data.

I have added another demo showing authorization. When I did this, I tested with Visual Studio 2013 and I had to add the following as a post-install step...

copy /Y "$(SolutionDir)packages\Microsoft.Bcl.Async.1.0.16\lib\net40\Microsoft.Threading.Tasks.Extensions.Desktop.dll" "$(TargetDir)Microsoft.Threading.Tasks.Extensions.Desktop.dll"

...as described in this Stack Overflow question.