chap11_6.htm

非常好的应用vc＋＋6.0进行相关网络程序开发的教程

        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">animation</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">动画设备</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">cdaudio</font></td>
        <td WIDTH="76%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">CD</font><font SIZE="3">播放器</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">dat</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">数字音频磁带机</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">digitalvideo</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">某一窗口中的数字视频（不基于</font><font FACE="Times New Roman" SIZE="3">GDI</font><font SIZE="3">）</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">other</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">未定义的</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">设备</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">overlay</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">重叠设备（窗口中的模拟视频）</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">scanner</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">图象扫描仪</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">sequencer</font></td>
        <td WIDTH="76%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">MIDI</font><font SIZE="3">序列器</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">videodisc</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">视盘机</font></td>
      </tr>
      <tr>
        <td WIDTH="24%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">waveaudio</font></td>
        <td WIDTH="76%"><font SIZE="3"><p ALIGN="JUSTIFY">播放数字波形文件的音频设备</font></td>
      </tr>
    </table>
    <p><font SIZE="3">　</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">　</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">请读者注意，设备类型和设备名是不同的概念。设备类型是指响应一组共用命令的一类</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">设备，而设备名则是某一个</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">设备的名字。系统需要用不同的设备名来区分属于同一设备类型的不同设备。</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">设备名是在注册表或</font><font FACE="Times New Roman" SIZE="3">SYSTEM.INI</font><font SIZE="3">的</font><font FACE="Times New Roman" SIZE="3">[mci]</font><font SIZE="3">部分定义的，典型的</font><font FACE="Times New Roman" SIZE="3">[mci]</font><font SIZE="3">段如下所示：</p>
    <blockquote>
      </font><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">[mci]</p>
      <p ALIGN="JUSTIFY">cdaudio=mcicda.drv</p>
      <p ALIGN="JUSTIFY">sequencer=mciseq.drv</p>
      <p ALIGN="JUSTIFY">waveaudio=mciwave.drv</p>
      <p ALIGN="JUSTIFY">avivideo=mciavi.drv</p>
      <p ALIGN="JUSTIFY">videodisc=mcipionr.drv</p>
    </blockquote>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">等号的左边是设备名，右边是对应的</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">驱动程序。当安装了新的</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">驱动程序时，系统要用不同的设备名来区分。设备名通常与驱动程序中的设备类型名相同，如</font><font FACE="Times New Roman" SIZE="3">cdaudio</font><font SIZE="3">和</font><font FACE="Times New Roman" SIZE="3">waveaudio</font><font SIZE="3">等，但也有例外，如</font><font FACE="Times New Roman" SIZE="3">avivideo</font><font SIZE="3">设备是一个</font><font FACE="Times New Roman" SIZE="3">digitalvideo</font><font SIZE="3">类型的设备。</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><font SIZE="3">使用</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">设备一般包括打开、使用和关闭三个过程。</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">的大部分命令可以控制不同的媒体设备。例如，可以用</font><font FACE="Times New Roman" SIZE="3">play</font><font SIZE="3">命令来播放</font><font FACE="Times New Roman" SIZE="3">WAVE</font><font SIZE="3">文件、视频文件或</font><font FACE="Times New Roman" SIZE="3">CD</font><font SIZE="3">。表</font><font FACE="Times New Roman" SIZE="3">11.7</font><font SIZE="3">列出常用的</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">命令字符串，表中大部分命令都具有通用性。在</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">命令的后面一般要跟一个设备名以指定操作的对象。</font><font FACE="Times New Roman" SIZE="3"></p>
    <p ALIGN="JUSTIFY"></font><b><font SIZE="3">　</p>
    <p ALIGN="CENTER">表</font><font FACE="Times New Roman" SIZE="3">11.7 </font><font SIZE="3">常用的</font><font FACE="Times New Roman" SIZE="3">MCI</font><font SIZE="3">命令</font></b></p>
    <table BORDER="1" CELLSPACING="1" CELLPADDING="1" WIDTH="579">
      <tr>
        <td WIDTH="33%"><font SIZE="3"><b><p ALIGN="JUSTIFY">命令</b></font></td>
        <td WIDTH="67%"><font SIZE="3"><b><p ALIGN="JUSTIFY">描述</b></font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">capacility</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">查询设备能力</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">close</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">关闭设备</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">info</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">查询设备的信息</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">open</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">打开设备</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">pause</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">暂停设备的播放或记录</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">play</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">开始设备播放</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">record</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">开始</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">resume</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">恢复暂停播放或记录的设备</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">seek</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">改变媒体的当前位置</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">set</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">改变设置</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">status</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">查询设备状态信息</font></td>
      </tr>
      <tr>
        <td WIDTH="33%"><font FACE="Times New Roman" SIZE="3"><p ALIGN="JUSTIFY">stop</font></td>
        <td WIDTH="67%"><font SIZE="3"><p ALIGN="JUSTIFY">停止设备的播放或记录</font></td>
      </tr>
    </table>