printdlg.cpp

Visual C++_ 600 编程学习捷径

// PrintDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Print.h"
#include "PrintDlg.h"
#include "PrintingDialog.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

//声明全局函数
BOOL CALLBACK _AfxAbortProc(HDC, int);
//外部文件定义的全局变量
extern BOOL g_bUserAbort;

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPrintDlg dialog

CPrintDlg::CPrintDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CPrintDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CPrintDlg)
	m_SourceFile = _T("");
	m_PrintInfo = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CPrintDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CPrintDlg)
	DDX_Text(pDX, IDC_FILENAME, m_SourceFile);
	DDX_Text(pDX, IDC_INFO, m_PrintInfo);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CPrintDlg, CDialog)
	//{{AFX_MSG_MAP(CPrintDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_OPEN, OnOpen)
	ON_BN_CLICKED(IDC_PRINT, OnPrintButton)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPrintDlg message handlers

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

	// Add "About..." menu item to system menu.
	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// 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
	
	int sx = GetSystemMetrics(SM_CXSCREEN);
	int sy = GetSystemMetrics(SM_CYSCREEN);
	CRect rc;
	GetWindowRect(&rc);
	MoveWindow(sx/8, sy/4, rc.Width(), rc.Height());
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CPrintDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// 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 CPrintDlg::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 CPrintDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CPrintDlg::OnOpen() 
{
	CFileDialog cfd(TRUE, "txt", NULL, 
		OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT|OFN_ALLOWMULTISELECT,
		"文本数据(*.txt)|*.txt||",this );
	cfd.m_ofn.lpstrTitle = "打开数据文本文件";
	if(cfd.DoModal() == IDOK)
	{
		m_SourceFile = cfd.GetPathName();
		UpdateData(FALSE);
	}
}

void CPrintDlg::OnPrintButton() 
{
	if(m_SourceFile.IsEmpty())
	{
		AfxMessageBox("请选择打印文件!");
		return;
	}

	OnFilePrint();//开始打印
}

BOOL CALLBACK _AfxAbortProc(HDC, int)
{
	MSG msg;
	while (!g_bUserAbort &&
		::PeekMessage(&msg, NULL, NULL, NULL, PM_NOREMOVE))
	{
		//处理用户消息
		if (!AfxGetThread()->PumpMessage())
			return FALSE;   //当收到WM_QUIT时终止
	}

	//当用户单击了正在打印对话框中的取消按钮时，终止当前打印
	return !g_bUserAbort;
}

BOOL CPrintDlg::DoPreparePrinting(CPrintInfo* pInfo)
{
	//确保pInfo和pInfo->m_pPD有效
	ASSERT(pInfo != NULL);
	ASSERT(pInfo->m_pPD != NULL);

	//确保CPrintInfo的最大页号大于最小页号
	if (pInfo->m_pPD->m_pd.nMinPage > pInfo->m_pPD->m_pd.nMaxPage)
		pInfo->m_pPD->m_pd.nMaxPage = pInfo->m_pPD->m_pd.nMinPage;

	CWinApp* pApp = AfxGetApp();
	//如果是在打印预览或直接打印，则不显示打印对话框
	if (pInfo->m_bPreview || pInfo->m_bDirect ||
		(pInfo->m_bDocObject && !(pInfo->m_dwFlags & PRINTFLAG_PROMPTUSER)))
	{
		if (pInfo->m_pPD->m_pd.hDC == NULL)
		{
			//获取缺省的打印DC,而不显示打印对话框.
			if (!pApp->GetPrinterDeviceDefaults(&pInfo->m_pPD->m_pd))
			{
				//如果不存在缺省的打印DC,则弹出安装打印机对话框.
				if (!pInfo->m_bDocObject || (pInfo->m_dwFlags & PRINTFLAG_MAYBOTHERUSER))
					if (pApp->DoPrintDialog(pInfo->m_pPD) != IDOK)//安装打印机后，则弹出打印对话框
						return FALSE;
			}

			if (pInfo->m_pPD->m_pd.hDC == NULL)
			{
				//如果上面的代码创建DC失败则调用CreatePrinterDC函数创建DC
				if (pInfo->m_pPD->CreatePrinterDC() == NULL)
					return FALSE;
			}
		}

		//设置打印的起始和终止页号
		pInfo->m_pPD->m_pd.nFromPage = (WORD)pInfo->GetMinPage();
		pInfo->m_pPD->m_pd.nToPage = (WORD)pInfo->GetMaxPage();
	}
	else
	{
		//弹出打印对话框，提示用户输入打印参数
		pInfo->m_pPD->m_pd.nFromPage = (WORD)pInfo->GetMinPage();
		pInfo->m_pPD->m_pd.nToPage = (WORD)pInfo->GetMaxPage();
		
		/*弹出打印对话框，创建打印DC*/
		if (pApp->DoPrintDialog(pInfo->m_pPD) != IDOK)
			return FALSE;       //如果用户取消了打印
	}

	ASSERT(pInfo->m_pPD != NULL);
	ASSERT(pInfo->m_pPD->m_pd.hDC != NULL);
	if (pInfo->m_pPD->m_pd.hDC == NULL)
		return FALSE;

	pInfo->m_nNumPreviewPages = pApp->m_nNumPreviewPages;
	VERIFY(pInfo->m_strPageDesc.LoadString(AFX_IDS_PREVIEWPAGEDESC));
	return TRUE;
}