usedlg.cpp

Thinkinc++English 电子书籍,英文版

// UseDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Use.h"
#include "UseDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CUseDlg dialog

CUseDlg::CUseDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CUseDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CUseDlg)
		// 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 CUseDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CUseDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CUseDlg, CDialog)
	//{{AFX_MSG_MAP(CUseDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_NEW, OnNew)
	ON_BN_CLICKED(IDC_CONTINUE, OnContinue)
	ON_BN_CLICKED(IDC_NEXT, OnNext)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CUseDlg message handlers

LPCOLESTR lpwFileName = L"c:\\prime.stg";
LPCOLESTR lpwStreamName = L"persist";

BOOL CUseDlg::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
	GetDlgItem( IDC_NEXT )->EnableWindow( FALSE );

	HRESULT hr = m_spPrime.CreateInstance( _T("Simple17.Prime") );
	if( FAILED( hr ) )
	{
		AfxMessageBox( _T("注册了否？初始化了否？") );
		m_spPrime.Release();
		return TRUE;
	}

	CComQIPtr < IPersistStreamInit > spPSI;
	spPSI = m_spPrime;
	if( !spPSI )
	{
		AfxMessageBox( _T("没有找到持续性接口") );
		m_spPrime.Release();
	}
	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 CUseDlg::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 CUseDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CUseDlg::OnNew() 
{
	CComPtr < IStorage > spStorage;
	CComPtr < IStream > spStream;

	HRESULT hr = ::StgCreateDocfile(
		lpwFileName,
		STGM_CREATE | STGM_WRITE | STGM_SHARE_EXCLUSIVE,
		0,
		&spStorage );
	if( FAILED( hr ) )
	{
		AfxMessageBox( _T("不能建立复合文件") );
		return;
	}
	hr = spStorage->CreateStream(
		lpwStreamName,
		STGM_CREATE | STGM_WRITE | STGM_SHARE_EXCLUSIVE,
		0,
		0,
		&spStream );
	if( FAILED( hr ) )
	{
		AfxMessageBox( _T("不能建立流") );
		return;
	}

	CComQIPtr < IPersistStreamInit > spPSI;
	spPSI = m_spPrime;
	if( !spPSI )
		AfxMessageBox( _T("组件没有提供持续性接口") );
	else
	{
		spPSI->InitNew();
		GetDlgItem( IDC_NEXT )->EnableWindow( TRUE );
	}
}

void CUseDlg::OnContinue() 
{
	CComPtr < IStorage > spStorage;
	CComPtr < IStream > spStream;

	HRESULT hr = ::StgOpenStorage(
		lpwFileName,
		NULL,
		STGM_READ | STGM_SHARE_EXCLUSIVE,
		NULL,
		0,
		&spStorage );
	if( FAILED( hr ) )
	{
		AfxMessageBox( _T("不能打开复合文件") );
		return;
	}

	spStorage->OpenStream(
		lpwStreamName,
		NULL,
		STGM_READ | STGM_SHARE_EXCLUSIVE,
		0,
		&spStream );
	if( FAILED( hr ) )
	{
		AfxMessageBox( _T("不能打开流读写") );
		return;
	}

	CComQIPtr < IPersistStreamInit > spPSI;
	spPSI = m_spPrime;
	if( !spPSI )
		AfxMessageBox( _T("组件没有提供持续性接口") );
	else
	{
		spPSI->Load( spStream );
		GetDlgItem( IDC_NEXT )->EnableWindow( TRUE );
	}
}

void CUseDlg::OnNext() 
{
	long nPrime = m_spPrime->GetNext();
	SetDlgItemInt( IDC_PRIME, nPrime );
}

void CUseDlg::OnCancel() 
{
	if( m_spPrime )
	{
		// 这里本应该取得 IPersistStreamInt 指针，但我们的处理却是
		// 取得 IPersistStream 指针，无所谓啦，反正 IPersistStreamInit
		// 指针是从 IPersistStream 继承来的，而且我们这里也不需要调用
		// IPersistStreamInit::InitNew() 函数
		CComQIPtr < IPersistStream > spPS;
		spPS = m_spPrime;

		HRESULT hr = spPS->IsDirty();
		if( S_OK == hr )	// 数据已经改变，则需要保存
		{
			CComPtr < IStorage > spStorage;
			CComPtr < IStream > spStream;

			hr = ::StgOpenStorage(
				lpwFileName,
				NULL,
				STGM_READWRITE | STGM_SHARE_EXCLUSIVE,
				NULL,
				0,
				&spStorage );
			if( SUCCEEDED( hr ) )
			{
				spStorage->OpenStream(
					lpwStreamName,
					NULL,
					STGM_WRITE | STGM_SHARE_EXCLUSIVE,
					0,
					&spStream );
				if( SUCCEEDED( hr ) )
					spPS->Save( spStream, TRUE );
			}
		}
	}

	CDialog::OnCancel();
}