In-proc 线程模型

[Rate]

COMDll2 中有 2 个类

BEGIN_OBJECT_MAP(ObjectMap)
OBJECT_ENTRY(CLSID_ApartmObj3, CApartmObj3)
OBJECT_ENTRY(CLSID_FeeObj, CFeeObj)
END_OBJECT_MAP()

CApartmObj3 线程模型: Apartment
CFeeObj 线程模型: Free

我打印如下一些线程ID:

CApartmObj3()
{
char Data[64];
memset(Data,0,sizeof(Data));
sprintf(Data,"CApartmObj3\tthread:0x%0x\tthis:0x%x\t",::GetCurrentThreadId(),(void*)this);

std::string strLog = Data;
strLog += "CApartmObj3()";

g_LogFile.WriteLog(strLog);
}

STDMETHODIMP CApartmObj3::QueryInfo2(BSTR *pName)
{
// TODO: Add your implementation code here

char Data[64];
memset(Data,0,sizeof(Data));
sprintf(Data,"CApartmObj3\tthread:0x%0x\tthis:0x%x\t",::GetCurrentThreadId(),(void*)this);

std::string strLog = Data;
strLog += "QueryInfo2()";

g_LogFile.WriteLog(strLog);


*pName = _bstr_t("CApartmObj3::QueryInfo2 test........").copy();

return S_OK;
}

CFeeObj()
{
char Data[64];
memset(Data,0,sizeof(Data));
sprintf(Data,"CFeeObj\tthread:0x%0x\tthis:0x%x\t",::GetCurrentThreadId(),(void*)this);

std::string strLog = Data;
strLog += "CFeeObj()";

g_LogFile.WriteLog(strLog);
}

STDMETHODIMP CFeeObj::QueryInfo2(BSTR *pName)
{
// TODO: Add your implementation code here

char Data[64];
memset(Data,0,sizeof(Data));
sprintf(Data,"CFeeObj\tthread:0x%0x\tthis:0x%x\t",::GetCurrentThreadId(),(void*)this);

std::string strLog = Data;
strLog += "QueryInfo2()";

g_LogFile.WriteLog(strLog);


*pName = _bstr_t("CFeeObj::QueryInfo2 test........").copy();

return S_OK;
}

我在测试中调用:

void CCOMTestDlg::OnButton1()
{

CoInitialize(NULL);

CLSID clsid;
HRESULT hr;

CLSIDFromProgID(OLESTR("COMDll2.ApartmObj3"), &clsid);

hr = CoCreateInstance(clsid, NULL, CLSCTX_ALL, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown2));


IApartmObj3 *pApartmObj3;

pIUnknown2->QueryInterface(__uuidof(IApartmObj3),(void**)&pApartmObj3);

pIUnknown2->Release();


BSTR Name2;
pApartmObj3->QueryInfo2(&Name2);

_bstr_t bstrName22(Name2,false);


MessageBox(bstrName22.operator char*());

//

IUnknown* pIUnknown3;

CLSIDFromProgID(OLESTR("COMDll2.FeeObj"), &clsid);

hr = CoCreateInstance(clsid, NULL, CLSCTX_ALL, __uuidof(IUnknown), reinterpret_cast<void**>(&pIUnknown3));


IFeeObj *pFeeObj;

pIUnknown3->QueryInterface(__uuidof(IFeeObj),(void**)&pFeeObj);

pIUnknown3->Release();


BSTR Name23;
pFeeObj->QueryInfo2(&Name23);

_bstr_t bstrName23(Name23,false);


MessageBox(bstrName23.operator char*());


pApartmObj3->Release();

pFeeObj->Release();

CoUninitialize();

}


最后日志如下:
[2007-11-29 17:03:36] main thread:0x814
[2007-11-29 17:03:36] CApartmObj3 thread:0x814 this:0x18b1940 CApartmObj3()
[2007-11-29 17:03:36] CApartmObj3 thread:0x814 this:0x18b1940 QueryInfo2()
[2007-11-29 17:03:36] CFeeObj thread:0x218 this:0x18b1750 CFeeObj()
[2007-11-29 17:03:36] CFeeObj thread:0x7c0 this:0x18b1750 QueryInfo2()

//
[2007-11-29 17:41:40] main thread:0x610
[2007-11-29 17:41:40] CApartmObj3 thread:0x610 this:0x18b1940 CApartmObj3()
[2007-11-29 17:41:40] CApartmObj3 thread:0x610 this:0x18b1940 QueryInfo2()
[2007-11-29 17:41:40] CFeeObj thread:0x818 this:0x18b1750 CFeeObj()
[2007-11-29 17:41:40] CFeeObj thread:0x850 this:0x18b1750 QueryInfo2()

main thread : 是 DllMain-> DLL_PROCESS_ATTACH 记录下来的

发现 CFeeObj 在 0x218 线程中创建， QueryInfo2() 在 0x7c0 被调用，这是为什么？

[jameshooo]

既然是自由线程模型，什么情况都可能发生。对象并不是在当前线程中创建的，而是在另外的MTA中完成创建的

[eduyu]

这得看COM库的具体实现了，并不违反COM规范。我猜是这样，COM库发现线程模型不匹配，于是在自己的
管理线程中（0x218）创建了组件，而后再开个线程（0x7c0），把创建的组件传入其中。
帮我做个实验，再创建个CFreeObj组件，我相信CFreeObj对象的构造函数还是在（0x218）中被调用。

[UltraBejing]

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