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<H2><A name=_Toc502915435></A><A name=_Toc392383541></A><A
name=_Toc392383446><SPAN style="mso-bookmark: _Toc392383541"><SPAN
style="mso-bookmark: _Toc502915435"><SPAN lang=EN-US>8.3 <SPAN
style="mso-spacerun: yes"> </SPAN>MIDI</SPAN></SPAN></SPAN></A><SPAN
style="mso-bookmark: _Toc392383446"><SPAN
style="mso-bookmark: _Toc392383541"><SPAN
style="mso-bookmark: _Toc502915435"><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">音乐播放器</SPAN></SPAN></SPAN></SPAN></H2>
<P class=MsoNormalIndent><SPAN lang=EN-US>MIDI</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">音乐也是声频的一部分。只是由于</SPAN><SPAN
lang=EN-US>MIDI</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">音乐本身的特殊性，所以本章特地将</SPAN><SPAN
lang=EN-US>MIDI</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">音乐与普通的声音区别开来。</SPAN></P>
<P class=MsoNormalIndent><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">下面就利用前面讲到的</SPAN><SPAN
lang=EN-US>MediaPlayer</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件常用的属性和方法来制作一个</SPAN><SPAN
lang=EN-US>MIDI</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">音乐播放器程序，它的功能是能够任意的选择一个有效的以</SPAN><SPAN
lang=EN-US>*.mid</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">为后缀的音乐文件，然后在程序中播放，在播放音乐的同时，在窗体中还将有一个滚动条来随时的显示声音文件的播放进度。</SPAN></P>
<P class=MsoNormalIndent><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">制作能够实现以上功能的音乐播放程序的具体步骤如下所示：</SPAN></P>
<H4><SPAN lang=EN-US>1</SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．开始工作</SPAN></H4>
<P class=MsoNormalIndent><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先启动一个新的项目，选择菜单</SPAN><SPAN
lang=EN-US>File</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中的</SPAN><SPAN
lang=EN-US>New Application</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">项，在</SPAN><SPAN
lang=EN-US>CBuilder 5</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的集成开发环境中就会弹出一个新建的窗体，然后向空白的窗体添加四个</SPAN><SPAN
lang=EN-US>Button</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件、一个</SPAN><SPAN
lang=EN-US>ScrollBar</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件、一个</SPAN><SPAN
lang=EN-US>MediaPlayer</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件、一个</SPAN><SPAN
lang=EN-US>OpenDialog</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件和一个</SPAN><SPAN
lang=EN-US>Timer</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件，添加组件后的窗体如图</SPAN><SPAN
lang=EN-US>8-19</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示。</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=191
src="C++ Builder 程序设计实用教程 - 8_3 MIDI音乐播放器 - 张晋 - 17xie.files/e566d4d847.jpg"
width=270 v:shapes="_x0000_i1025"></SPAN></P>
<P class=MsoCaption><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN
lang=EN-US>8-19<SPAN style="mso-spacerun: yes"> </SPAN></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">添加组件后的窗体</SPAN></P>
<P class=MsoNormalIndent><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所添加的组件的功能如下所示：</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.5pt; TEXT-INDENT: -21.25pt; mso-list: l0 level1 lfo1; tab-stops: list 21.25pt"><SPAN
lang=EN-US
style="FONT-FAMILY: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings"><SPAN
style="mso-list: Ignore">n<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US>MediaPlayer</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件：为播放音乐文件和系统多媒体设备之间建立连接的关系，同时负责打开多媒体播放设备；</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.5pt; TEXT-INDENT: -21.25pt; mso-list: l0 level1 lfo1; tab-stops: list 21.25pt"><SPAN
lang=EN-US
style="FONT-FAMILY: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings"><SPAN
style="mso-list: Ignore">n<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US>Button</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件：实现打开文件、播放文件、暂停播放和停止播放等功能；</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.5pt; TEXT-INDENT: -21.25pt; mso-list: l0 level1 lfo1; tab-stops: list 21.25pt"><SPAN
lang=EN-US
style="FONT-FAMILY: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings"><SPAN
style="mso-list: Ignore">n<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US>ScrollBar</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件：显示程序中播放声音文件的进度，并且能够通过拖动滚动条来手动控制播放的进度；</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.5pt; TEXT-INDENT: -21.25pt; mso-list: l0 level1 lfo1; tab-stops: list 21.25pt"><SPAN
lang=EN-US
style="FONT-FAMILY: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings"><SPAN
style="mso-list: Ignore">n<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US>OpenDialog</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件：它的作用是显示一个的“打开”的对话框，同时还能够实现打开音乐文件的功能，在其中还可以对多媒体文件进行筛选操作；</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.5pt; TEXT-INDENT: -21.25pt; mso-list: l0 level1 lfo1; tab-stops: list 21.25pt"><SPAN
lang=EN-US
style="FONT-FAMILY: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings"><SPAN
style="mso-list: Ignore">n<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN lang=EN-US>Timer</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件：为程序运行提供时间控制，如随时显示声音文件播放进度。</SPAN></P>
<H4><SPAN lang=EN-US>2</SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．属性设置</SPAN></H4>
<P class=MsoNormalIndent><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">添加组件后的下一步工作就是为所添加的组件设置各自的属性，窗体与组件的属性设置可以在程序的设计阶段通过改变属性列表框中的内容来达到，同样，也可以在程序中通过代码来达到，这两种方法的效果是相同的。</SPAN></P>
<P class=MsoNormalIndent><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在本示例程序中，窗体及组件的属性设置如下所示：</SPAN></P>
<P class=a1><SPAN lang=EN-US>object Form1: TForm1</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>Left
= 192</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>Top =
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