文件读取

读取txt文件到内存中

void CMouseWheel_TestDlg::OnBnClickedButton3()
{
       // TODO: 在此添加控件通知处理程序代码
       CFile myFile;
      CFileException ex;
       if (!myFile.Open("D:\\myfile.txt",CFile::modeRead,&ex))
       {
               MessageBox("未打开文件");
              TCHAR  szCause[255];
              CString strFormatted;
              ex.GetErrorMessage(szCause, 255);
              strFormatted = _T("The data file could not be opened because of this error: ");
              strFormatted += szCause;
              AfxMessageBox(strFormatted);
              return;
        }
        DWORD v_dwFileLength;
        v_dwFileLength=myFile.GetLength();
        if (v_dwFileLength==0)
        {
                MessageBox("文件为空");
                return;
        }
        myFile.Seek(0,CFile::begin);
        char *buffer=new char[v_dwFileLength]; 
        CString Show;
        myFile.Read(buffer,v_dwFileLength);
        myFile.Close(); 
        Show=buffer;
        delete[] buffer; 
        MessageBox(Show);
}