Coinitialize(nil) 和 CoInitializeEx(0, COINIT_MULTITHREADED) 的区别 [英] Coinitialize(nil) and CoInitializeEx(0, COINIT_MULTITHREADED) difference

问题描述

在一个线程中，如果我使用

in a thread, is there a difference if I use

Coinitialize(nil)

而不是

CoInitializeEx(0, COINIT_MULTITHREADED);

我使用的是 Delphi 7，但我认为这个问题对于其他编程语言仍然存在感谢您的帮助.

I use Delphi 7 but I presume the question can remain for other programming languages Thanks for your help.

推荐答案

前者初始化 COM 的方式是将调用线程放入自己的单线程单元 (STA).后者以将调用线程放入共享多线程单元 (MTA) 的方式初始化 COM.这两个单元有非常不同的语义，尤其是在如何跨线程边界访问 COM 对象方面.不同套间中的线程必须使用代理来共享 COM 对象，但 COM 为您提供同步(通过每个线程的消息队列).同一个单元中的线程可以在不使用代理的情况下共享 COM 对象，但必须手动同步，例如使用临界区或互斥锁.

The former initializes COM in a way that puts the calling thread into its own single-threaded apartment (STA). The latter initializes COM in a way that puts the calling thread into a shared multi-threaded apartment (MTA). The two apartments have very different semantics, especially in how COM objects are accessed across thread boundaries. Threads in different apartments must use proxies to share COM objects, but COM provides synchronization for you (via per-thread messages queues). Threads in the same apartment can share COM objects without using proxies, but must synchronize manually, such as with critical sections or mutexes.

所以是的，存在差异，并且可能非常重要.请阅读MSDN上的文档，非常详细.

So yes, there is a difference and it can be very significant. Please read the documentation on MSDN, it is very detailed.

CoInitialize 函数

CoInitializeEx 函数

进程、线程和公寓

这篇关于Coinitialize(nil) 和 CoInitializeEx(0, COINIT_MULTITHREADED) 的区别的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！