appmemdlg.cpp

《Windows Media编程导向》配套代码

// AppMemDlg.cpp : implementation file
//

#include "stdafx.h"
#include "AppMem.h"
#include "AppMemDlg.h"

#include "DllMem.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CAppMemDlg dialog

CAppMemDlg::CAppMemDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CAppMemDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CAppMemDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CAppMemDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAppMemDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAppMemDlg, CDialog)
	//{{AFX_MSG_MAP(CAppMemDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON_APP_ALLOCATE_APP_DELETE, OnButtonAppAllocateAppDelete)
	ON_BN_CLICKED(IDC_BUTTON_DLL_ALLOCATE_APP_DELETE, OnButtonDllAllocateAppDelete)
	ON_BN_CLICKED(IDC_BUTTON_DLL_ALLOCATE_DLL_DELETE, OnButtonDllAllocateDllDelete)
	ON_BN_CLICKED(IDC_BUTTON_COM_ALLOCATE_DELETE, OnButtonComAllocateDelete)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CAppMemDlg message handlers

BOOL CAppMemDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CAppMemDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CAppMemDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

// Correct!
void CAppMemDlg::OnButtonAppAllocateAppDelete() 
{
	BYTE * pBuffer = new BYTE[100];
	if (pBuffer)
	{
		delete[] pBuffer;
		pBuffer = NULL;
	}
}

// Incorrect!!! Because memory on different leaps.
void CAppMemDlg::OnButtonDllAllocateAppDelete() 
{
	BYTE * pBuffer = dllNew(100);
	if (pBuffer)
	{
		delete[] pBuffer;
		pBuffer = NULL;
	}
}

// Correct!
void CAppMemDlg::OnButtonDllAllocateDllDelete() 
{
	BYTE * pBuffer = dllNew(100);
	if (pBuffer)
	{
		dllDelete(pBuffer);
		pBuffer = NULL;
	}	
}

// Correct!
void CAppMemDlg::OnButtonComAllocateDelete() 
{
	BYTE * pBuffer = ComWrapperNew(100);
	if (pBuffer)
	{
		CoTaskMemFree(pBuffer);
		pBuffer = NULL;
	}
}