Inter-Process Communication (IPC) Introduction and Sample Code

/****************************** Module Header ******************************\
* Module Name:	MFCActiveXCtrl.h
* Project:		MFCActiveX
* Copyright (c) Microsoft Corporation.
* 
* Declaration of the CMFCActiveXCtrl ActiveX Control class.
* See MFCActiveXCtrl.cpp for the implementation.
* 
* This source is subject to the Microsoft Public License.
* See http://www.microsoft.com/opensource/licenses.mspx#Ms-PL.
* All other rights reserved.
* 
* History:
* * 1/21/2009 11:04 PM Jialiang Ge Created
\***************************************************************************/

#pragma once
#include "maindialog.h"


class CMFCActiveXCtrl : public COleControl
{
	DECLARE_DYNCREATE(CMFCActiveXCtrl)

// Constructor
public:
	CMFCActiveXCtrl();

// Overrides
public:
	virtual void OnDraw(CDC* pdc, const CRect& rcBounds, const CRect& rcInvalid);
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
	virtual void DoPropExchange(CPropExchange* pPX);
	virtual void OnResetState();
	virtual DWORD GetControlFlags();

// Implementation
protected:
	~CMFCActiveXCtrl();

	BEGIN_OLEFACTORY(CMFCActiveXCtrl)        // Class factory and guid
		virtual BOOL VerifyUserLicense();
		virtual BOOL GetLicenseKey(DWORD, BSTR FAR*);
	END_OLEFACTORY(CMFCActiveXCtrl)

	DECLARE_OLETYPELIB(CMFCActiveXCtrl)      // GetTypeInfo
	DECLARE_PROPPAGEIDS(CMFCActiveXCtrl)     // Property page IDs
	DECLARE_OLECTLTYPE(CMFCActiveXCtrl)		// Type name and misc status

	// Subclassed control support
	BOOL IsSubclassedControl();
	LRESULT OnOcmCommand(WPARAM wParam, LPARAM lParam);

// Message maps
	DECLARE_MESSAGE_MAP()

// Dispatch maps
	DECLARE_DISPATCH_MAP()

// Event maps
	DECLARE_EVENT_MAP()

// Dispatch and event IDs
public:
	enum {
		dispidGetProcessThreadID = 3L,
		eventidFloatPropertyChanging = 1L,
		dispidFloatProperty = 2,
		dispidHelloWorld = 2L,
	};
	CMainDialog m_MainDialog;
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
protected:
	// The float field used by FloatProperty
	FLOAT m_fField;
protected:
	BSTR HelloWorld(void);
	void GetProcessThreadID(LONG* pdwProcessId, LONG* pdwThreadId);
	FLOAT GetFloatProperty(void);
	void SetFloatProperty(FLOAT newVal);

	void FloatPropertyChanging(FLOAT NewValue, VARIANT_BOOL* Cancel)
	{
		FireEvent(eventidFloatPropertyChanging, EVENT_PARAM(VTS_R4 VTS_PBOOL), NewValue, Cancel);
	}
};