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场景：com.dll 没有声明其套件类型：
1. CoInitialize(0);
CoInitializeEx(0, COINIT_APARTMENTTHREADED);
只有一个线程：
?
2. CoInitializeEx(0, COINIT_MULTITHREADED);
进入套件前，只有主线程。
CoInitializeEx(0, COINIT_MULTITHREADED); 调用之后线程没有增加。
?
CoCreateInstance(CLSID_CBClassFactory, NULL, CLSCTX_INPROC_SERVER, IID_IY, (void**)&piy);
这条语句执行之后，线程数增加。增加了5个。调用失败了。
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客户套件类型????????????组件套件类型???????? 是否成功????????线程数
COINIT_APARTMENTTHREADED 没有声明????????????调用成功???? 1
COINIT_MULTITHREADED 没有声明????????????调用失败???? 6
COINIT_MULTITHREADED Apartment????????????调用失败???? 6
COINIT_MULTITHREADED Free???????????? 调用成功???? 1
COINIT_MULTITHREADED Both???????????? 调用成功???? 1
COINIT_APARTMENTTHREADED Both????????????调用成功???? 1
COINIT_APARTMENTTHREADED Free????????????调用失败???? 7
COINIT_APARTMENTTHREADED Apartment????????????调用成功???? 1
可以看到上面有3中类型的调用失败了，其失败的原因是：
客户套件和组件线程模型不兼容，所以调用失败
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原文地址：http://www.cnblogs.com/a-ray-of-sunshine/p/4658691.html
