CFileDialog  FileDlg(TRUE, "*.txt", NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, "(*.txt)|*.txt||");
	FileDlg.DoModal();
	CString  cstrFileName;
	cstrFileName = FileDlg.GetPathName();
	//未選中任何文件
	if ("" == cstrFileName)
	{
		return ;
	}
	CFile    file;
	char*    pszBuff = NULL;
	if (file.Open(cstrFileName.GetString(), CFile::modeReadWrite | CFile::shareDenyWrite))
	{
		ULONGLONG   ullLeng = 0;
		ullLeng = file.GetLength();
		pszBuff = new char[ullLeng];//分配內存資源
		ZeroMemory(pszBuff, ullLeng);
		file.Read(pszBuff, ullLeng);
		file.Close();
	}
	//寫入編輯框
	m_edtText.SetWindowText(pszBuff);

	//釋放內存資源
	if (NULL != pszBuff)
	{
		delete [] pszBuff;

	}