VS2005 MFC 开发COM 遇到的问题,高手请进.

2013-01-23 10:41:53 309 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

COM 组件设计与应用（六）vs2005下的ATL 一、前言　　1、与《COM 组件设计与应用(五)》的内容基本一致。但本回讲解的是在 vc.net 2003 下的使用方法，即使你不再使用vc6.0，也请和上一回的内容，参照比对。　　2、这第一个组件，除了所有 COM 组件必须的 IUnknown 接口外，我们再实现一个自己定义的接口 IFun，它有两个函数： Add()完成两个数值的加法，Cat()完成两个字符串的连接。　　3、下面......好好听讲! 开始了:-)二、阅读详情

我用VS2005 生成一个MFC DLL(支持自动化).

添加一个继承自CCmdTarget的类, 然后使用MFC标准方法添加接口与类厂(代码如下).问题是在客户程序中用CoCreateInstance创建组件的时候总是返回E_OUTOFMEMORY(在调用前已初始化COM库). 我跟踪程序,发现类厂已经被创建,但类厂却没有创建组件. 由于是标准的类厂实现, 无法跟踪到MFC类厂的代码中. 所以很迷茫.

另外还有一个现象是, 用VC6.0生成一个扩展DLL项目,把这些代码原封不动拷入,编译生成组件. 客户程序就可以正常创建组件,并能正常调用接口.

还有就是我注意到VC6.0没有生成的IDL文件,而VS2005却自动维护一个IDL文件,这个IDL文件中只有组件描述, 没有接口描述, 我手动加上接口描述后, 可调用还是不成功.

1, 接口定义:



#include "stdafx.h"



class ICom2Interface1: public IUnknown

{

public:

	virtual void _stdcall Function1() = 0;

	virtual void _stdcall Function2() = 0;

};



class ICom2Interface2: public IUnknown

{

public:

	virtual void _stdcall Function1() = 0;

	virtual void _stdcall Function2() = 0;

};

2, 组件定义:



class CComponetObj : public CCmdTarget

{

	DECLARE_DYNCREATE(CComponetObj)

	CComponetObj();



protected:

	virtual ~CComponetObj();



public:

	BEGIN_INTERFACE_PART (TmpObj1, ICom2Interface1)

		INIT_INTERFACE_PART (CComponetObj, TmpObj1)

		STDMETHOD_(void,Function1)();

		STDMETHOD_(void,Function2)();

	END_INTERFACE_PART_STATIC(TmpObj1)



	BEGIN_INTERFACE_PART (TmpObj2, ICom2Interface2)

		INIT_INTERFACE_PART (CComponetObj, TmpObj2)

		STDMETHOD_(void,Function1)();

		STDMETHOD_(void,Function2)();

	END_INTERFACE_PART_STATIC(TmpObj2)



	DECLARE_MESSAGE_MAP()

	DECLARE_INTERFACE_MAP()

	DECLARE_OLECREATE(CComponetObj)



};

组件的实现代码:



// {037439C0-3F86-4309-A129-B3E8E6E94B2F}

extern "C" const GUID IID_ICom2Interface1 = 

{ 0x37439c0, 0x3f86, 0x4309, { 0xa1, 0x29, 0xb3, 0xe8, 0xe6, 0xe9, 0x4b, 0x2f } };



// {167722E4-EDF3-4ea8-B085-3A82B2BF8AF1}

extern "C" const GUID IID_ICom2Interface2 = 

{ 0x167722e4, 0xedf3, 0x4ea8, { 0xb0, 0x85, 0x3a, 0x82, 0xb2, 0xbf, 0x8a, 0xf1 } };



IMPLEMENT_DYNAMIC(CComponetObj, CCmdTarget)



IMPLEMENT_OLECREATE(CComponetObj, "COM_2.Object", 

0xe3ee73ee, 0xced5, 0x429b, 0x9a, 0x6f, 0x9d, 0x32, 0xe1, 0x17, 0x6b, 0x8c);



CComponetObj::CComponetObj()

{

	wprintf (L"Constructing CComponetObj!\r\n");

}



CComponetObj::~CComponetObj()

{

}



BEGIN_MESSAGE_MAP(CComponetObj, CCmdTarget)

END_MESSAGE_MAP()



BEGIN_INTERFACE_MAP(CComponetObj, CCmdTarget)

	INTERFACE_PART (CComponetObj, IID_ICom2Interface1, TmpObj1)

	INTERFACE_PART (CComponetObj, IID_ICom2Interface2, TmpObj2)

END_INTERFACE_MAP()





STDMETHODIMP_(ULONG) CComponetObj::XTmpObj1::AddRef()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj1)

	return (ULONG)pThis->ExternalAddRef();

}



STDMETHODIMP_(ULONG) CComponetObj::XTmpObj1::Release()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj1)

	return (ULONG)pThis->ExternalRelease();

}



STDMETHODIMP CComponetObj::XTmpObj1::QueryInterface(REFIID iid, LPVOID * ppv)

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj1)

	return (HRESULT)pThis->ExternalQueryInterface(&iid, ppv);

}



STDMETHODIMP_(void) CComponetObj::XTmpObj1::Function1()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj1)

	wprintf (L"ICom2Interface1->Function1 has been called.\r\n");

}



STDMETHODIMP_(void) CComponetObj::XTmpObj1::Function2()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj1)

	wprintf (L"ICom2Interface1->Function2 has been called.\r\n");

}



STDMETHODIMP_(ULONG) CComponetObj::XTmpObj2::AddRef()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj2)

	return (ULONG)pThis->ExternalAddRef();

}



STDMETHODIMP_(ULONG) CComponetObj::XTmpObj2::Release()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj2)

	return (ULONG)pThis->ExternalRelease();

}



STDMETHODIMP CComponetObj::XTmpObj2::QueryInterface(REFIID iid, LPVOID * ppv)

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj2)

	return (HRESULT)pThis->ExternalQueryInterface(&iid, ppv);

}



STDMETHODIMP_(void) CComponetObj::XTmpObj2::Function1()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj2)

	printf ("ICom2Interface2->Function1 has been called.\r\n");

}



STDMETHODIMP_(void) CComponetObj::XTmpObj2::Function2()

{

	METHOD_PROLOGUE_EX_(CComponetObj, TmpObj2)

	printf ("ICom2Interface2->Function2 has been called.\r\n");

}