📄 c++ builder 程序设计实用教程 - 8_2 声音文件播放器 - 张晋 - 17xie.htm
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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、暂停播放和结束程序运行等功能；</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.5pt; TEXT-INDENT: -21.25pt; mso-list: l1 level1 lfo2; 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>TrackBar</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，能够给用户留下一个比较直观的印象；</SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.5pt; TEXT-INDENT: -21.25pt; mso-list: l1 level1 lfo2; 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声音文件的功能，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: l1 level1 lfo2; 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=a3><SPAN lang=EN-US>object Form1: TForm1</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>Left
= 192</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>Top =
107</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes"> </SPAN>Width
= 382</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Height = 256</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Caption = 'Form1'</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>OnClose = FormClose</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>OnCreate = FormCreate</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>object MediaPlayer1: TMediaPlayer</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Left = 24</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Top = 160</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Width = 325</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Height = 49</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Display = MediaPlayer1</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>FileName = 'C:\WINDOWS\MEDIA\The Microsoft Sound.wav'</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>end</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>object Button1: TButton</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Left = 24</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Top = 112</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Width = 97</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Height = 33</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Caption = '</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">打开</SPAN><SPAN
lang=EN-US>'</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>OnClick = Button1Click</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>end</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>object Button2: TButton</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Left = 136</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Top = 112</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Width = 97</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Height = 33</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Caption = '</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">暂停</SPAN><SPAN
lang=EN-US>'</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>OnClick = Button2Click</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>end</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>object Button3: TButton</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Left = 248</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Top = 112</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Width = 97</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Height = 33</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Caption = '</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">停止</SPAN><SPAN
lang=EN-US>'</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>OnClick = Button3Click</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>end</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>object TrackBar1: TTrackBar</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Left = 24</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Top = 48</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Width = 337</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Height = 41</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Orientation = trHorizontal</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Frequency = 1</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Position = 0</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>SelEnd = 0</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>SelStart = 0</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>end</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>object OpenDialog1: TOpenDialog</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Left = 120</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Top = 80</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>end</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>object Timer1: TTimer</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Enabled = False</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Interval = 100</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>OnTimer = Timer1Timer</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Left = 224</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>Top = 80</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN>end</SPAN></P>
<P class=a3><SPAN lang=EN-US>end</SPAN></P>
<H4><SPAN lang=EN-US>3</SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．设置文件过滤器</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'">在程序的设计阶段，用鼠标的左键双击窗体的空白处，在屏幕上就会弹出一个代码窗口，把光标移动到窗体的</SPAN><SPAN
lang=EN-US>FormCreate()</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事件处理代码中，并且添加如下所示的设置文件过滤器的代码：</SPAN></P>
<P class=a3><SPAN lang=EN-US>void __fastcall TForm1::FormCreate(TObject
*Sender)</SPAN></P>
<P class=a3><SPAN lang=EN-US>{</SPAN></P>
<P class=a3><SPAN lang=EN-US>Form1->OpenDialog1->Filter="All
Files(*.*)|*.*|WAVE Files(*.wav)|*.wav";</SPAN></P>
<P class=a3><SPAN lang=EN-US>//</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设置文件过滤器</SPAN></P>
<P class=a3><SPAN lang=EN-US>Form1->Timer1->Enabled=false;</SPAN></P>
<P class=a3><SPAN lang=EN-US>//</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设置组件有效状态</SPAN></P>
<P class=a3><SPAN lang=EN-US>}</SPAN></P>
<P class=a3><SPAN
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