文件分割与合并

long  CFileSpltDlg::GetSplitFileSize() 

//获取用户选择文件分割后的大小
{
	char buf[100];
	m_FileSize.GetWindowText(buf,100);
	for(int i=0; i<(int)strlen(buf); i++)
	{
		if(!::isdigit(buf[i]))
		{
		MessageBox("请输入数字!","文件分割",

                MB_ICONEXCLAMATION);
			return 0;
		}
	}
	
	return atoi(buf)*1000000;
}

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int CFileSpltDlg::MergeMe() // 文件合并涵数
{
  CWaitCursor wait;
  CFile destFile;
  CFileException ex;

  BYTE buffer[140000];
  DWORD dwRead;
  UINT nCount = 140000;
  UINT newlen = 1400000;
  char buff[20];
  long l = 1;
  CString name;
  CString pref;
  CString newpath;

  UpdateData(TRUE);

  if (!m_path.IsEmpty())
  {
    if (!m_SourceFile.Open(m_path, CFile::modeRead | CFile::shareDenyNone |
      CFile::typeBinary, &ex))
    {
      TCHAR szError[1024];
      ex.GetErrorMessage(szError, 1024);
      ::AfxMessageBox(szError);
      m_edit.SetFocus();
      m_edit.SetSel(0,  - 1);
      return 1;
    }
    m_filename = m_path.Right((m_path.GetLength() - m_path.ReverseFind('\\')) -
      1);
    m_SourceFile.Close();
  }

  newpath = m_path.Left(m_path.GetLength() - m_filename.GetLength());

  if (!m_targetpath.IsEmpty())
  {
    if (!m_filename.IsEmpty() && m_filename.Left(2) != _T("1_"))
    {
      ::AfxMessageBox(_T("待合并的源文件名不对..."), MB_ICONERROR);
      return 1;
    }
    else if (m_filename.IsEmpty())
    {
      MessageBox(_T("请选择待合并的源文件."), _T("文件分割器"),
        MB_ICONEXCLAMATION);
      return 1;
    }
    m_filename = m_filename.Right(m_filename.GetLength() - 2);

    if (m_targetpath.Right(1) == '\\')
      m_path = m_targetpath + m_filename;
    else
      m_path = m_targetpath + _T("\\") + m_filename;

    if (!destFile.Open(m_path, CFile::modeWrite | CFile::shareExclusive | CFile
      ::typeBinary | CFile::modeCreate, &ex))
    {
      TCHAR szError[1024];
      ex.GetErrorMessage(szError, 1024);
      ::AfxMessageBox(szError);
      return 0;
    }
  }
  else if (m_path.IsEmpty())
  {
    MessageBox(_T("请选择待合并的源文件."), _T("文件分割器"),
      MB_ICONEXCLAMATION);
    return 1;
  }
  if (m_targetpath.IsEmpty())
  {
    //target is not there
    MessageBox(_T("请选择合并后要保存到的目标文件夹."), _T("文件分割器"),
      MB_ICONEXCLAMATION);
    return 1;
  }
  do
  {
    pref = _ltoa(l, buff, 10);
    pref += _T("_");
    if (!m_SourceFile.Open(newpath + pref + m_filename, CFile::modeRead | CFile
      ::shareExclusive | CFile::typeBinary, &ex))
    {
      TCHAR szError[1024];
      ex.GetErrorMessage(szError, 1024);
      destFile.Close();
      m_path = _T("");
      m_filename = _T("");
      newpath = _T("");
      UpdateData(FALSE);

      return 0;
    }
    else
      name = _T(newpath + pref + m_filename);
    do
    {
      dwRead = m_SourceFile.Read(buffer, nCount);
      destFile.Write(buffer, dwRead);
    }
    while (dwRead > 0);

    m_SourceFile.Close()   ;

    pProgress.SetRange(0, 500);
    for (int i = 0; i < 500; i++)
      pProgress.SetPos(i);
    m_parts = _ltoa(l, buff, 10);
    m_parts += _T("个文件已合并");
    UpdateData(FALSE);
    l++;
    UpdateWindow();
  }    while (l < 500)     ;

  return 0;
}

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int CFileSpltDlg::SplitMe() //文件分割涵数
{
	CWaitCursor wait;
	
	CFile destFile;
	
	CFileException ex;
	
	DWORD dwRead;
	UINT newlen;
	char buff [20];
	char b [20];
	long l = 1;
	CString name;
	UINT len = 0;
	
	UpdateData(TRUE);
	
	
    newlen=GetSplitFileSize(); 	

//获取文件分割后的大小，定义相对应变量数值
	UINT nCount = newlen/10;
    BYTE buffer[140000];
	
	if (!m_path.IsEmpty())
	{
	if (!m_SourceFile.Open(m_path, CFile::modeRead | 

        CFile::shareDenyNone| CFile::typeBinary, &ex))
    {
		TCHAR szError[1024];
		ex.GetErrorMessage(szError, 1024);
		::AfxMessageBox(szError);
		m_edit.SetFocus();
		m_edit.SetSel(0, -1);
		return 1;
		}
		len = m_SourceFile.GetLength();
	}
	else
	{
	MessageBox(_T("请选择待分割的源文件."), 

                   _T("文件分割器"), MB_ICONEXCLAMATION);
		return 1;
	}
	if (m_targetpath.IsEmpty())
	{
	MessageBox(_T("请选择分割后保存到的目标文件夹."),

                   _T("文件分割器"),MB_ICONEXCLAMATION);
		return 1;
	}
	
	if (len < newlen)
	{
	CString length = _itoa(len, b, 10);
	MessageBox(_T("文件长度为 " + length + 

        " 字节，不够指定的分割大小， 没有必要再进行分割."),
        _T("文件分割器"), MB_ICONEXCLAMATION);
		m_SourceFile.Close();
		m_path = _T("");
		m_filename = _T("");
		UpdateData(FALSE);
		return 1;
	}
	
	do {
		name = _ltoa(l, buff, 10);
		name += _T("_");
		CString newpath;
		
		//判断选择目录未尾是否已有"\"符
		if(m_targetpath.Right(1)=='\\')
			newpath = m_targetpath;
		else
			newpath = m_targetpath + _T("\\");
		if (!destFile.Open(

                   newpath + name + m_SourceFile.GetFileName(),
			CFile::modeWrite		|
			CFile::shareExclusive	|
			CFile::typeBinary		|
			CFile::modeCreate, &ex)) {
			TCHAR szError[1024];
			ex.GetErrorMessage(szError, 1024);
			::AfxMessageBox(szError);
			m_SourceFile.Close();
			return 1;
		}
		do
		{
		  dwRead = m_SourceFile.Read(buffer, nCount);
		     destFile.Write(buffer, dwRead);
		}while (dwRead > 0 

                        && destFile.GetLength() < newlen);
		
		destFile.Close();
		pProgress.SetRange(0, len /newlen*10);
		
		pProgress.SetPos(l);
		m_parts = _ltoa(l , buff, 10);
		m_parts += _T("个文件生成");
		UpdateData(FALSE);
		l++;
		UpdateWindow();
		
	}while (dwRead > 0);
	
	m_SourceFile.Close();
	m_path = _T("");
	m_filename = _T("");
	UpdateData(FALSE);
	
	return 0;
}

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