[UT99 Native] Check if DLL is installed

Hi,

I'm writing a UT99 mod which requires some native code on the clients. The mod runs fine on both server and client as long as the client has already installed my DLL. But ... if the client hasn't yet installed the DLL (because it has to download it from the server first) it crashes with an ugly exception:

Can't bind to native class MyNativePackage.MyNativeClass

History: UClass:: Bind <- (Class MyNativePackage.MyNativeClass) <- ULinkerLoader::CreateExport ...

So my questions is:
How can I check if the client has installed my DLL?

If it has then I can call my native code. Otherwise I have ask the user if he trusts my mod ( ) and allows the loader (a normal UnrealScript class) to install the DLL so I can execute it after rebooting UT.

Thanx for the quick replies.

I will try if these functions do the job. I know it must be possible because it works for QValidate. When connecting to a QValidate server a message window opens that tells you that the DLL has been installed and that you have to reboot UT now. On the next time you can connect to the server and the DLL is active.

Oh yes, I really like to have a look at the code. But ... too bad ... Professor Q has removed his source code from the package (for security reasons).

But it seems that he's using DynamicLoadObject, too (as I can see at the binary file of the package).

Ok, I've tested DynamicLoadObject and you're right - it doesn't solve the problem.

Now I have 2 packages: The 1st consists of pure UnrealScript classes while the 2nd contains the native class. Both packages have been declared as server packages so the client is downloading both. So far this is working well. The client can run an actor from the pure UnrealScript class but as soon as this actor is calling DynamicLoadObject with a class of the native package UT is crashing. Too bad ...

So I need a different way to check if the DLL is present. I've searched the Wiki for objects/actors/functions that "touch" files. Someone said that UTPure is using WebResponse.IncludeBinaryFile to read random files from the UT folder. But it sounds quite difficult since you have to implement a HTTP server and client for this.

Now I'm testing CheckSumCommandlet. When running this Commandlet at the DOS prompt it returns with exitcode 0 for any existing file but returns 1 if the file does not exist. That's all I need. And CheckSumCommandlet's parameter doesn't have to be a valid Unreal package - you can specify any file.

But how can I use a (this) Commandlet in my actor? Since Commandlet is not an actor but an object I've created the Commandlet object with:

local Commandlet cc;
cc=New class'CheckSumCommandlet';
result=cc.Main(Filename);


But this causes UT to crash with the following error message:

Critical: Failed to find function Main in CheckSumCommandlet CTF-Face.CheckFileExists0.CheckSumCommandlet0