将COleDateTime类型数据转换成char *数据

用OpenCV做多摄像头校准时间，在图像上显示时间信息，需求要将COleDateTime类型数据转换成char *数据

具体代码如下：

  1: COleDateTime	m_checkDate;
 
  2: COleDateTime timeCur;
 
  3: timeCur = COleDateTime::GetCurrentTime();
 
  4: COleDateTime timeStart(timeCur.GetYear(), timeCur.GetMonth(), timeCur.GetDay(), timeCur.GetHour(), timeCur.GetMinute(), timeCur.GetSecond());
 
  5: m_checkDate = timeStart;
 
  6:
 
  7: CString str_tempTime = m_checkDate.Format(_T("%Y-%m-%d %H:%M:%S"));
 
  8:
 
  9: int n = str_tempTime.GetLength();
 
 10: //获取宽字节字符的大小，大小是按字节计算的
 
 11: int len = WideCharToMultiByte(CP_ACP, 0, str_tempTime, str_tempTime.GetLength(), NULL, 0, NULL, NULL);
 
 12: //为多字节字符数组申请空间，数组大小为按字节计算的宽字节字节大小
 
 13: char * pFileName = new char[len + 1];   //以字节为单位
 
 14: //宽字节编码转换成多字节编码
 
 15: WideCharToMultiByte(CP_ACP, 0, str_tempTime, str_tempTime.GetLength(), pFileName, len, NULL, NULL);
 
 16: pFileName[len] = '\0';   //多字节字符以'\0'结束