C# client-side resource fails to load libraries

FiveM Resource Development & Modding Discussion
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1

I’ve been trying to use libraries on the client side for a while, without any success.
I always receive one of these errors:

  • System.DllNotFoundException
  • System.IO.FileNotFoundException
  • System.TypeLoadException

I tried almost every solution i could find on the internet, but at this point I think I’m missing something basic.
In particular, I suppose there must be an error with the transfer of the actual DLLs files to the clients, even if in my fxmanifest.lua I included:

file ‘Client/*.dll’

By the way I’m not sure about this, because while the resource is loading it still appears the Debug line:

Loaded [name of the library], Version=…, Culture=neutral, PublicKeyToken=… into ScriptDomain

The library I need to use right now is WebSocketSharp, which has no dependencies (it comes into a single dll file, no transitive packages).

If you want more material to examine PLEASE ask and I’ll be happy to show you.
Thanks in advance.

2

Sandboxing prevents some libraries from loading I believe, but I wouldn’t have thought a WebSocket library would be an issue.

3

Is sandboxing relevant? I don’t think it is in this case, and even if it was, as you said, it’s really strange that even a “simple” library without dependencies cannot load. By the way, thanks for the response. Have you got something to try to solve the problem?

4

Did you try including them as client scripts instead of files?

5

Yes I have, but no results. It just tries to run the libraries without success.

6

Even if the library has no dependencies it will still depend on runtime libraries such as System.Net, which obviously will fail to load on the client. Anyways a full error would be useful not just the exception class.

7

Sure thing:

[     26360] [    GTAProcess]             MainThrd/ Loaded haryel.Client.net, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null into ScriptDomain_1708032259
[     26360] [    GTAProcess]             MainThrd/ Loaded websocket-sharp, Version=1.0.2.59611, Culture=neutral, PublicKeyToken=5660b08a1845a91e into ScriptDomain_1708032259
[     26360] [    GTAProcess]             MainThrd/ Failed to instantiate instance of script haryel.Client.ClientMain: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeLoadException: Error verifying haryel.Client.ClientMain:.ctor (): Could not load type WebSocketSharp.WebSocket at 0x0000
[     26375] [    GTAProcess]             MainThrd/   at (wrapper managed-to-native) System.Reflection.MonoCMethod:InternalInvoke (System.Reflection.MonoCMethod,object,object[],System.Exception&)
[     26375] [    GTAProcess]             MainThrd/   at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00002] in <b575c7ac070e41ffa0751333b6ac9f42>:0 
[     26375] [    GTAProcess]             MainThrd/    --- End of inner exception stack trace ---
[     26375] [    GTAProcess]             MainThrd/   at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00014] in <b575c7ac070e41ffa0751333b6ac9f42>:0 
[     26375] [    GTAProcess]             MainThrd/   at System.RuntimeType.CreateInstanceMono (System.Boolean nonPublic) [0x000a8] in <b575c7ac070e41ffa0751333b6ac9f42>:0 
[     26375] [    GTAProcess]             MainThrd/   at System.RuntimeType.CreateInstanceSlow (System.Boolean publicOnly, System.Boolean skipCheckThis, System.Boolean fillCache, System.Threading.StackCrawlMark& stackMark) [0x00009] in <b575c7ac070e41ffa0751333b6ac9f42>:0 
[     26375] [    GTAProcess]             MainThrd/   at System.RuntimeType.CreateInstanceDefaultCtor (System.Boolean publicOnly, System.Boolean skipCheckThis, System.Boolean fillCache, System.Threading.StackCrawlMark& stackMark) [0x00027] in <b575c7ac070e41ffa0751333b6ac9f42>:0 
[     26375] [    GTAProcess]             MainThrd/   at System.Activator.CreateInstance (System.Type type, System.Boolean nonPublic) [0x00020] in <b575c7ac070e41ffa0751333b6ac9f42>:0 
[     26375] [    GTAProcess]             MainThrd/   at System.Activator.CreateInstance (System.Type type) [0x00000] in <b575c7ac070e41ffa0751333b6ac9f42>:0 
[     26375] [    GTAProcess]             MainThrd/   at CitizenFX.Core.InternalManager.CreateAssemblyInternal (System.String assemblyFile, System.Byte[] assemblyData, System.Byte[] symbolData) [0x000c4] in C:\gl\builds\master\fivem\code\client\clrcore\InternalManager.cs:156

The files I have in the Client folder are these:

CitizenFX.Core.Client.dll
haryel.Client.net.dll
websocket-sharp.dll

(The resource is named haryel)

8

The sandbox is refusing to load WebSocketSharp.WebSocket. Again you cannot use these libraries on the client.

9

Is there anything I could do in your opinion? Thanks in advance.