如何在2个进程之间共享COM对象？
我希望 Application1.exe 实例化其 Item 类的实例。
我希望 Application2.exe 在此对象上调用 GetPrice()。
我已按照以下网站上的步骤 1-7 进行操作：
http://www.codeguru.com/Cpp /COM-Tech/activex/tutorials/article.php/c5567/
这是我到目前为止所拥有的。
Application1 的 main 看起来像这样：
CoInitialize( NULL );
DWORD dwRegister;
ItemFactory *pFactory = new ItemFactory;
CoRegisterClassObject( CLSID_Item, pFactory, CLSCTX_LOCAL_SERVER, REGCLS_MULTIPLEUSE, &dwRegister );
_getch();
return 0;
Application2 的 main 看起来像这样：
CoInitialize( NULL );
CoGetClassObject( CLSID_Item, CLSCTX_LOCAL_SERVER, NULL, IID_IItem, (LPVOID *)&pFactory );
我的问题（希望是我唯一的问题）是我不知道如何将我的 Item 类（或其接口 IItem）与 CLSID_Item 关联起来；这只是我在另一个文件中定义的一些随机 GUID。我尝试过
CoRegisterPSClsid( IID_IItem, CLSID_Item );
在这行之后，我尝试
Item *pItem;
CoCreateInstance( CLSID_Item, NULL, CLSCTX_LOCAL_SERVER, IID_IItem, (LPVOID *)&pItem );
得到 E_NOINTERFACE 错误。
我应该使用 CoCreateInstance 创建工厂吗？呃，好混乱……
I want Application1.exe to instantiate an instance of its Item class.
I want Application2.exe to call GetPrice() on this object.
I have followed steps 1-7 on the following website:
http://www.codeguru.com/Cpp/COM-Tech/activex/tutorials/article.php/c5567/
This is what I have so far.
Application1's main looks like this:
CoInitialize( NULL );
DWORD dwRegister;
ItemFactory *pFactory = new ItemFactory;
CoRegisterClassObject( CLSID_Item, pFactory, CLSCTX_LOCAL_SERVER, REGCLS_MULTIPLEUSE, &dwRegister );
_getch();
return 0;
Application2's main looks like this:
CoInitialize( NULL );
CoGetClassObject( CLSID_Item, CLSCTX_LOCAL_SERVER, NULL, IID_IItem, (LPVOID *)&pFactory );
My Issue (hopefully my only issue) is that I have no idea how to associate my Item class (or its interface, IItem) with CLSID_Item; this is just some random GUID I defined in another file. I've tried
CoRegisterPSClsid( IID_IItem, CLSID_Item );
After this line, I tried
Item *pItem;
CoCreateInstance( CLSID_Item, NULL, CLSCTX_LOCAL_SERVER, IID_IItem, (LPVOID *)&pItem );
I get an E_NOINTERFACE error.
Should I be creating a factory with CoCreateInstance? Ugh, so confused...
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为了跨进程或线程边界使用 COM，您必须 告诉 COM 有关您的接口的信息，以便它可以在进程之间编组您的函数参数/返回值。最简单的方法是使用系统中预定义的接口，例如 IDispatch，但如果您想使用自己的接口，则必须 注册代理/存根 DLL，或类型库。如果您不这样做，那么跨 COM 域对自定义接口的 QueryInterface 调用将失败，并显示
E_NOINTERFACE，如您所见。In order to use COM across process or thread boundraries, you must tell COM about your interfaces so it can marshal your function arguments/return values between processes. The easiest way to do this is to use an interface predefined in the system, such as IDispatch, but if you want to use your own, you must either register a proxy/stub DLL, or a type library. If you don't do this, then calls to QueryInterface for your custom interface across COM domains will fail with
E_NOINTERFACE, as you are seeing.