[roge]

I'm trying to write a MM:S plugin that extends the Vscript scripting interface in CS:GO. But I'm running into this problem, I can't get IScriptVM->LookupFunction() to return anything except NULL. If you look here in the SDK, you'll see this example:

// Generally, use the "Call" functions. This example is the equivalent of DoIt("Har", 6.0, 99).

hFunction = pScriptVM->LookupFunction( "DoIt", hScope );
pScriptVM->Call( hFunction, hScope, true, NULL, "Har", 6.0, 99 );

Now some of my test code looks something like this:

void VpTestScriptFunctionCall() {
    HSCRIPT func = g_mScriptVM->LookupFunction("ScriptPrintMessageChatAll");
    g_mScriptVM->Call(func, NULL, true, NULL, "It works!");
}

But after a little bit of debugging I realized that `g_mScriptVM->LookupFunction` was always returning NULL, I tried giving it a scope(even though that's an optional argument), I tried giving it a function name that I added through "ScriptRegisterFunction", and I tried giving it a function listed in the CS:GO Vscript Documentation, none of that seemed to have helped, it still just returns NULL. Does anyone have any ideas how I can get LookupFunction to do anything? ...or does this just seem to be a problem with the SDK?

(Just in case anyone is interested, I'm getting my instance of IScriptVM by hooking CreateVM in IScriptManager.)

[psychonic]

Do it do the same if you pass INVALID_HSCRIPT as the second param to LookupFunction? (instead of the default of NULL)

I've only messed with the VScript interface in Dota with Lua, but it definitely works there. INVALID_SCRIPT is the global "scope", else the the the scope is the HSCRIPT of a class instance.

[roge]

Originally Posted by psychonic Do it do the same if you pass INVALID_HSCRIPT as the second param to LookupFunction? (instead of the default of NULL) I've only messed with the VScript interface in Dota with Lua, but it definitely works there. INVALID_SCRIPT is the global "scope", else the the the scope is the HSCRIPT of a class instance.

Nope, still hasn't seem to have done anything.

[psychonic]

Oh! Instead of:

HSCRIPT func = g_mScriptVM->LookupFunction("ScriptPrintMessageChatAll");

Have you tried?

HSCRIPT func = g_mScriptVM->LookupFunction("PrintMessageChatAll");

You should be using the name of the function in the scripting language, not the name of the C++ function that it points at.

[roge]

Originally Posted by psychonic Oh! Instead of: HSCRIPT func = g_mScriptVM->LookupFunction("ScriptPrintMessageChatAll"); Have you tried? HSCRIPT func = g_mScriptVM->LookupFunction("PrintMessageChatAll"); You should be using the name of the function in the scripting language, not the name of the C++ function that it points at.

That is the name of the function in the scripting language, and like I said I tried doing LookupFunction() on functions that I created with ScriptRegisterFunction(), and that doesn't work either.

[Peace-Maker]

You could try to log all the functions registered in the vscript vm and see if the ones you try to hook are present.
See the source of this especially the Register* hooks here.

[roge]

Originally Posted by Peace-Maker You could try to log all the functions registered in the vscript vm and see if the ones you try to hook are present. See the source of this especially the Register* hooks here.

Yes the functions I'm trying to get at are present in the VM. This still hasn't lead me to fixing the problem of LookupFunction() returning nothing but NULL. But it did kinda help me achieve what I was interested in doing. If I hook RegisterFunction() inside IScriptVM, and then hold onto the function bindings for the functions I want I can call them later by doing something like this:

ScriptVariant_t args[1];
args[0] = "It works!!!";
chatPrintBinding->m_pfnBinding(chatPrintBinding->m_pFunction, NULL, args, 1, NULL);

I've tested this, and it works. Thanks.

[psychonic]

I dug into this a bit more for the sake of curiosity.

The LookupFunction implementation in the squirrel VM calls the more generic LookupObject (not exposed on the interface) to get the function by name, but then checks sq_isclosure. Since Squirrel differentiates between closures and native closures, the script functions implemented in C++ don't pass that check, only functions written in Squirrel.

Edit: It looks like GetValue should work for getting at functions.