AHK SAMP CMD processor

; return true and run callback func -> OnSendmycommand(params*)
; if comand uncnown return false
getCommand(dwParams) {
    if (isInChat() = 1) and (not isDialogOpen()) and (not UseAlternative)
    {
        BlockChatInput()
        sleep 250
        dwAddress := dwSAMP + 0x12D8F8
        chatInput := readString(hGTA, dwAddress, 256)
        if ( InStr(chatInput, "/") ) {
            if (StrLen(chatInput) > 0 ) {
                unBlockChatInput()
                params := StrSplit(chatInput, " ")
                dwAddress := dwSAMP + 0x12D8F8
                writeString(hGTA, dwAddress, "")
                AntiCrash()
                funcname = "OnSend"
                funcname .= SubStr(params[1], 1)
                try {
                    callback := RegisterCallback(funcname, "F", 3)
                    DllCall(callback, "Str", params[2], "Str", params[3], "Str", params[4])
                    return true
                } catch e {
                    unBlockChatInput()
                    AntiCrash()
                    return false
                }
            } else {
                unBlockChatInput()
                AntiCrash()
            }
        } else {
            unBlockChatInput()
            AntiCrash()
        }
    }
    return false
}