[HamletEagle]

My signature file:

{
    "name"        : "Spawn",
    "class"       : "CWeaponBox",
    "library"     : "mod",
    "identifiers" :
    [
        {
            "os"    : "windows",
            "mod"   : "cstrike",
            "value" : [0x56,0x8B,0xF1,0x8B,0x06,0xFF,0x50,0x04,0x8B,0x4E,0x04,"*","*","*","*","*","*","*","*","*","*",0xC7,0x81,0x08,0x01,0x00,0x00,0x06,0x00,0x00,0x00,0x8B]
        },
        {
            "os"    : "linux",
            "mod"   : "cstrike",
            "value" : "Spawn__10CWeaponBox"
        }
    ]
}

The log:

Parsing file "Spawn" started
	Function is updated
Parsing file "Spawn" ended

The call:

PHP Code:

WeaponBox = OrpheuCall(CWeaponBox_Spawn) 


The error:

L 01/24/2015 - 08:33:54: [ORPHEU] Invalid parameters count. Expected [2]. Got [1]
L 01/24/2015 - 08:33:54: [AMXX] Displaying debug trace (plugin "test2.amxx")
L 01/24/2015 - 08:33:54: [AMXX] Run time error 10: native error (native "OrpheuCall")
L 01/24/2015 - 08:33:54: [AMXX]    [0] Untitled.sma::create (line 48)

Registering the func:

PHP Code:

CWeaponBox_Spawn = OrpheuGetFunction("Spawn", "CWeaponBox")
//OrpheuRegisterHook(CWeaponBox_Spawn,"CWeaponBoxSpawn",OrpheuHookPre) 


Why it says that the native expect two params ? I the signature the arguments field is empty since the function has void into the header.

I'm thinking that OrpheuCall need at least one argument(one arg + function index = two params), but:

PHP Code:

unsigned int paramsCount = params[0] / sizeof(cell);

    Function* function = Global::FunctionManagerObj->getFunction(params[1]);

    if (function)
    {
        unsigned int expectedParamsCount = 1 + function->getArgumentsCount() + function->getIfReturnByRefParamsCount();

        if (paramsCount == expectedParamsCount)
        {
            function->blockHooks();
            return function->call(amx, &params[2]);
        }
        else
        {
            MF_LogError(amx, AMX_ERR_NATIVE, "Invalid parameters count. Expected [%d]. Got [%d]", expectedParamsCount, paramsCount);
        }
    }
    else
    {
        MF_LogError(amx, AMX_ERR_NATIVE, "Invalid function [%d]", params[1]);
    }

    return 0; 


I see that here it does some calculation to determinate the needed param count, maybe there is something wrong ?

Any ideeas why this error apper when the function has no arguments ?

[Arkshine]

Because the current instance of CWeaponBox class is not passed, meaning the hidden object "this", which from pawn context refers to an entity index. In others words, when you create a "weaponbox" entity, the returned value is an instance of CWeaponBox class, and from that, it allows you to access to functions which are included in this class, here Spawn.

Spawn is a virtual function. To call CWeaponBox::Spawn, you need to create a "weaponbox" entity, and just calling Ham_Spawn with it.

[HamletEagle]

I was doing that only to know if we can manipulate weaponboxes only with game functions, without doing manually things like creating, spawning, adding weapons, removing and so on.
In the decompiled windows code I saw int __thiscall sub_100CFD70(void *this) which confused me a bit because void mean nothing, now I understood what was with it.

Thanks!

[Arkshine]

You just need to pass a valid object, whatever retrieved from a new weaponbox or existing entity.