MCI发送指令无法进行播放音乐（编译链接通过），大神都来围观，给点意见

[时光若止-Dale]

void CMFCmusicDlg::OnBnClickedPleyer()   //播放音乐
{
	// TODO:  在此添加控件通知处理程序代码
	if (aa == "")
	{
		OnBnClickedOpen();
	}
	else
	{
		if (m_flag && aa != "")
		{
			m_flag = false;
			MCI_OPEN_PARMS mciopenparms;      //打开文件
			MCI_VD_PLAY_PARMS mciplayparms;//播放
			/*CString    aa;*/
			mciopenparms.lpstrElementName = aa;  //播放路径
			mciopenparms.lpstrDeviceType = NULL;//文件类型
			

			//向MCI发送命令消息让操作系统进行播放
			mciSendCommand(0, MCI_OPEN, MCI_DEVTYPE_WAVEFORM_AUDIO, (DWORD)(LPVOID)&mciopenparms);
			m_count = mciopenparms.wDeviceID;//统计设备ID
			mciplayparms.dwCallback = (DWORD)GetSafeHwnd();
			cdlen = getinfo(MCI_STATUS_LENGTH);  //得到歌曲的长度
                        //时间设置
			cdto = MCI_MAKE_HMS(MCI_HMS_HOUR(cdlen), MCI_HMS_MINUTE(cdlen), MCI_HMS_SECOND(cdlen));
			mciplayparms.dwFrom = cdfrom;
			mciplayparms.dwTo = cdto;


			mciSendCommand(m_count, MCI_PLAY, MCI_TO | MCI_FROM, (DWORD)(LPVOID)&mciplayparms);
			m_sl.SetRange(0, cdlen);
			SetTimer(0, 1000, NULL);
			UpdateData(false);
		}
		else
		{
			m_flag = true;
			KillTimer(0);
			DWORD dwsf = getinfo(MCI_STATUS_POSITION);
			cdfrom = MCI_MAKE_MSF(MCI_MSF_MINUTE(dwsf), MCI_MSF_SECOND(dwsf), MCI_MSF_FRAME(dwsf));
			mciSendCommand(m_count, MCI_CLOSE, 0, NULL);
			m_count = 0;

		}
	}
}