// TestCRC32Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "TestCRC32.h"
#include "TestCRC32Dlg.h"
#include "Crc32.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()

/////////////////////////////////////////////////////////////////////////////
// CTestCRC32Dlg dialog

CTestCRC32Dlg::CTestCRC32Dlg(CWnd* pParent /*=NULL*/)
	: CDialog(CTestCRC32Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CTestCRC32Dlg)
	m_FileName = _T("");
	m_Crc32Value = _T("0");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CTestCRC32Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CTestCRC32Dlg)
	DDX_Text(pDX, IDC_FILE_NAME, m_FileName);
	DDX_Text(pDX, IDC_CRC32_RESULT, m_Crc32Value);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CTestCRC32Dlg, CDialog)
	//{{AFX_MSG_MAP(CTestCRC32Dlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BROWSE, OnBrowse)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTestCRC32Dlg message handlers

BOOL CTestCRC32Dlg::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
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CTestCRC32Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

void CTestCRC32Dlg::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();
	}
}

HCURSOR CTestCRC32Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CTestCRC32Dlg::OnBrowse() 
{
     CFileDialog dlg(TRUE, NULL, "(all files)", OFN_HIDEREADONLY,
				"All Files (*.*)|*.*||", this);

     if(IDOK != dlg.DoModal())
        return;

	 this->m_FileName=dlg.GetPathName();
	 this->m_Crc32Value= "0";
	 this->UpdateData(FALSE);

	 GetFileCrc();

	 this->UpdateData(FALSE);
}

void CTestCRC32Dlg::OnOK() 
{
	CDialog::OnOK();
}

void  CTestCRC32Dlg::GetFileCrc()
{
	CFile file;
	if ( !file.Open(m_FileName, CFile::modeRead|CFile::typeBinary) )
	{
		this->MessageBox("文件打開(kāi)失敗！");
		return ;
	}

	int len=file.GetLength();
	char *pData=new char[len];
	if ( pData!=NULL )
	{
		int readLen=file.ReadHuge(pData, len);
		if ( readLen == len )
		{
			CCrc32 crc;
			int	crcValue;
			crcValue=crc.GetCRC(pData, len);
			this->m_Crc32Value.Format("%X",crcValue);
		}
		else
		{
			this->MessageBox("文件讀取出錯(cuò)！");
		}
		delete pData;
	}
	else
	{
		this->MessageBox("內(nèi)存分配出錯(cuò)！");
	}

	file.Close();
}