Why do events not work when updating the quantity OnProductUpdate, OnBeforeProductUpdate?

Question

C++ / C#

AddEventHandler('catalog', 'OnProductUpdate', ['MyClass', 'OnProductUpdateHandler']);
class MyClass
{
    function OnProductUpdateHandler($id, &$arFields)
    {
         $arLoadProductArray = $arFields['QUANTITY'] > 0 ? Array("IN_STOCK" => "Y") : Array("IN_STOCK" => "N");
    }
}
AddEventHandler("catalog", "OnBeforeProductUpdate", "notInStore");
function notInStore($ID,&$arFields){
        if (($arFields['QUANTITY'] != $arFields['OLD_QUANTITY']) || (!is_null($arFields['QUANTITY']) && is_null($arFields['OLD_QUANTITY']))) {
            if (intval($arFields["QUANTITY"]) > 100) {
                $arFields["QUANTITY"] = 100;
            }
        }
}

I change the Available quantities in the infoblock.
And also is there such an event that, with several warehouses, only the warehouse that has been updated counts?

$eventManager->addEventHandler('catalog','OnStoreProductAdd', 'UpdateAvailableQuantity');
$eventManager->addEventHandler('catalog','OnStoreProductUpdate', 'UpdateAvailableQuantity');
$eventManager->addEventHandler('catalog','OnStoreProductDelete', 'DeletesAvailableQuantity');

use  \Bitrix\Main\Loader;
Loader::includeModule('catalog');
function UpdateAvailableQuantity($id, $arFields){
    $obProduct = new CCatalogProduct();
    if (intval($arFields["AMOUNT"])>=100){
        $obProduct->Update($arFields["PRODUCT_ID"], ['QUANTITY' => 100, 'SUBSCRIBE' => 'D']);
    }else{
        if ($arFields["AMOUNT"]==0)
            $obProduct->Update($arFields["PRODUCT_ID"], ['QUANTITY' => 0, 'SUBSCRIBE' => 'D']);
        else
            $obProduct->Update($arFields["PRODUCT_ID"], ['QUANTITY' => $arFields["AMOUNT"], 'SUBSCRIBE' => 'D']);
    }
}

Passes 2 times as there are 2 warehouses and that's bad.

Answer 1

See the documentation for the following WinAPI calls: OpenProcess, ReadProcessMemory, WriteProcessMemory, CloseHandle. In addition, there is such a thing as restrictions on reading and writing to the memory of other processes, and you may need to set these additional flags or request rights.

Answer 2

You probably need to see the address of the object in memory, and not "... the object whose value in memory I need to find" or is it still the address of the object's property? But anyway - create a pointer to an object or property and initialize it with whatever you want, then print that pointer to stdout ("%p") and see the address of what you want. Moreover, regardless of Win or Lin .. :)

Answer 3

These are obsolete events, you need to enable support for obsolete events in the settings of the "Trade catalog" module