computedlg.cpp

计算器

// computeDlg.cpp : implementation file
//

#include "stdafx.h"
#include "compute.h"
#include "computeDlg.h"

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

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

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()

/////////////////////////////////////////////////////////////////////////////
// CComputeDlg dialog

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

void CComputeDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CComputeDlg)
	DDX_Text(pDX, IDC_COMPUTE, m_strCompute);
	DDX_Text(pDX, IDC_RESULT, m_strResult);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CComputeDlg, CDialog)
	//{{AFX_MSG_MAP(CComputeDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CComputeDlg message handlers

BOOL CComputeDlg::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
	
	// TODO: Add extra initialization here
	sm_DialogHWND = m_hWnd;
	sm_EditHWND = GetDlgItem(IDC_COMPUTE)->m_hWnd;
	sm_EditWNDPROC = (LRESULT (CALLBACK*)(HWND, UINT, WPARAM, LPARAM))GetWindowLong(sm_EditHWND, GWL_WNDPROC);
	// 窗口子类化，为了实现当输入框获得焦点的时候，我能定制清除操作。
	SetWindowLong(sm_EditHWND, GWL_WNDPROC, (LONG)EditWNDPROC);
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CComputeDlg::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 CComputeDlg::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 CComputeDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

#include "_compute.h"

void CComputeDlg::OnOK() 
{
	// TODO: Add extra validation here
	UpdateData();

	char	temp[_MAX_PATH] = {0};
	// 获得输入串
	strcat(temp, (LPCSTR)m_strCompute);
	// 添加结束标志符
	strcat(temp, "#");

	// 执行计算
	double	r = execute(temp);
	char	buffer[_MAX_PATH] = {0};

	// 错误检查
	geterror(buffer);
	if(strcmp(buffer, "") == 0)
		sprintf(buffer, "%f", r);

	m_strResult = buffer;

	// 更新结果信息
	UpdateData(FALSE);

	// 突出现实结果信息
	GetDlgItem(IDC_RESULT)->SetFocus();
	((CEdit *)(GetDlgItem(IDC_RESULT)))->SetSel(0, strlen(buffer));

//	CDialog::OnOK();
}

void CComputeDlg::OnCancel() 
{
	// TODO: Add extra cleanup here
	
	CDialog::OnCancel();
}

HWND CComputeDlg::sm_DialogHWND = NULL;
HWND CComputeDlg::sm_EditHWND = NULL;
LRESULT (CALLBACK* CComputeDlg::sm_EditWNDPROC)(HWND, UINT, WPARAM, LPARAM) = NULL;

// 子类化后的输入框编辑控件的窗口函数
LRESULT CALLBACK CComputeDlg::EditWNDPROC(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch(uMsg)
	{
	// 捕获编辑框WM_SETFOCUS消息
	case WM_SETFOCUS:
		// 清除两个编辑框中的内容
		::SetWindowText(hWnd, "");
		::SetWindowText(::GetDlgItem(sm_DialogHWND, IDC_RESULT), "");
		break;

	default:
		break;
	}

	// 传递消息给原来的控件的窗口函数处理
	if(sm_EditWNDPROC)
		return CallWindowProc(sm_EditWNDPROC, hWnd, uMsg, wParam, lParam);
	else
		return -1;
}