📄 c++ builder 程序设计实用教程 - 8_5 cd光碟播放器 - 张晋 - 17xie.htm
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<P class=a1><SPAN
lang=EN-US>Form1->Edit1->Text=IntToStr(Form1->MediaPlayer1->Tracks);</SPAN></P>
<P class=a1><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'">显示曲目总数</SPAN></P>
<P class=a1><SPAN
lang=EN-US>Form1->Edit2->Text=IntToStr(Form1->MediaPlayer1->Position);</SPAN></P>
<P class=a1><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'">显示播放位置</SPAN></P>
<P class=a1><SPAN
lang=EN-US>Form1->MediaPlayer1->TimeFormat=tfMilliseconds;</SPAN></P>
<P class=a1><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'">设置时间格式</SPAN></P>
<P class=a1><SPAN
lang=EN-US>Form1->Edit3->Text=FloatToStr((Form1->MediaPlayer1->Length)/60000)+"</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">分</SPAN><SPAN
lang=EN-US>";</SPAN></P>
<P class=a1><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'">显示唱片长度</SPAN></P>
<P class=a1><SPAN
lang=EN-US>Form1->Edit4->Text=IntToStr(Form1->MediaPlayer1->Start);</SPAN></P>
<P class=a1><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'">显示播放起始位置</SPAN></P>
<P class=a1><SPAN lang=EN-US>switch (Form1->MediaPlayer1->Mode)</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>{</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN>case
mpNotReady: Form1->Edit5->Text="Not ready";</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>break;</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN>case
mpStopped:<SPAN style="mso-spacerun: yes">
</SPAN>Form1->Edit5->Text="Stopped";</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>break;</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN>case
mpPlaying:<SPAN style="mso-spacerun: yes">
</SPAN>Form1->Edit5->Text="Playing";</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>break;</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN>case
mpRecording:Form1->Edit5->Text="Recording";</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>break;</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">
</SPAN><SPAN style="mso-spacerun: yes"> </SPAN>case
mpSeeking:<SPAN style="mso-spacerun: yes">
</SPAN>Form1->Edit5->Text="Seeking";</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>break;</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN>case
mpPaused:<SPAN style="mso-spacerun: yes">
</SPAN>Form1->Edit5->Text="Paused";</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>break;</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN>case
mpOpen:<SPAN style="mso-spacerun: yes">
</SPAN>Form1->Edit5->Text="Open";</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes">
</SPAN>}</SPAN></P>
<P class=a1><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'">显示播放模式</SPAN></P>
<P class=a1><SPAN lang=EN-US>}</SPAN></P>
<P class=a1><SPAN
lang=EN-US>//---------------------------------------------------------------------------</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'">由于组件属性设置的原因，在程序的执行过程中，每隔</SPAN><SPAN
lang=EN-US>100</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">毫秒的时间就会自动的激活一个</SPAN><SPAN
lang=EN-US>Timer1Timer()</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事件，在它的响应事件中通过一系列语句在窗体的文本框中分别显示</SPAN><SPAN
lang=EN-US>CD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">曲目总数、当前播放位置、时间格式、唱片长度、播放起始位置和播放模式。</SPAN></P>
<H4><SPAN lang=EN-US>5</SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．响应按钮事件</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'">在窗体上我们放置了五个</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，它们的作用如下所示：</SPAN></P>
<P class=MsoNormalIndent
style="MARGIN-LEFT: 42pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo2; tab-stops: list 42.0pt"><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
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">“播放</SPAN><SPAN
lang=EN-US>CD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">”按钮：开始播放光盘中的</SPAN><SPAN
lang=EN-US>CD </SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">音乐；</SPAN></P>
<P class=MsoNormalIndent
style="MARGIN-LEFT: 42pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo2; tab-stops: list 42.0pt"><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
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">“暂停播放”按钮：能够暂停</SPAN><SPAN
lang=EN-US>CD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的播放动作；</SPAN></P>
<P class=MsoNormalIndent
style="MARGIN-LEFT: 42pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo2; tab-stops: list 42.0pt"><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
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">“停止播放”按钮：停止播放</SPAN><SPAN
lang=EN-US>CD</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；</SPAN></P>
<P class=MsoNormalIndent
style="MARGIN-LEFT: 42pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo2; tab-stops: list 42.0pt"><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
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">“前一首”按钮：跳转到当前曲目的前一首；</SPAN></P>
<P class=MsoNormalIndent
style="MARGIN-LEFT: 42pt; TEXT-INDENT: -21pt; mso-list: l0 level1 lfo2; tab-stops: list 42.0pt"><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
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">“后一首”按钮：跳转到当前曲目的后一首；</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'">在程序的设计过程中，通过双击相应按钮组件就可以直接进入该组件的事件处理过程中，在这里对各个按钮的代码添加过程就不加赘述了，如果读者有什么不清楚的地方，请参看附后的源程序代码。</SPAN></P>
<H4><SPAN lang=EN-US>6</SPAN><SPAN
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．运行程序</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'">完成以上的工作后，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>Save All</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选项，在弹出的对话框中选择一个合适的文件名存储文件。按键盘上的功能键</SPAN><SPAN
lang=EN-US>F9</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">运行程序，程序运行结果如图</SPAN><SPAN
lang=EN-US>8-29</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=208
src="C++ Builder 程序设计实用教程 - 8_5 CD光碟播放器 - 张晋 - 17xie.files/5cfe3a4bc3.jpg"
width=249 v:shapes="_x0000_i1028"></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>8-29<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'">程序运行结果</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'">附程序完整源代码如下所示：</SPAN></P>
<DIV
style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 4pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 4pt; PADDING-BOTTOM: 1pt; BORDER-LEFT: windowtext 1pt solid; PADDING-TOP: 1pt; BORDER-BOTTOM: windowtext 1pt solid; mso-element: para-border-div; mso-border-alt: solid windowtext .5pt">
<P class=a0
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0cm; BORDER-TOP: medium none; PADDING-LEFT: 0cm; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; PADDING-TOP: 0cm; BORDER-BOTTOM: medium none; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 1.0pt 4.0pt 1.0pt 4.0pt"><SPAN
style="FONT-FAMILY: 仿宋_GB2312; mso-ascii-font-family: 'Times New Roman'">程序清单</SPAN><SPAN
lang=EN-US
style="FONT-SIZE: 9pt; mso-bidi-font-size: 10.0pt"><o:p></o:p></SPAN></P></DIV>
<P class=a1><SPAN
lang=EN-US>//---------------------------------------------------------------------------</SPAN></P>
<P class=a1><SPAN lang=EN-US>#include <vcl.h></SPAN></P>
<P class=a1><SPAN lang=EN-US>#pragma hdrstop</SPAN></P>
<P class=a1><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US>#include "CD.h"</SPAN></P>
<P class=a1><SPAN
lang=EN-US>//---------------------------------------------------------------------------</SPAN></P>
<P class=a1><SPAN lang=EN-US>#pragma package(smart_init)</SPAN></P>
<P class=a1><SPAN lang=EN-US>#pragma resource "*.dfm"</SPAN></P>
<P class=a1><SPAN lang=EN-US>TForm1 *Form1;</SPAN></P>
<P class=a1><SPAN
lang=EN-US>//---------------------------------------------------------------------------</SPAN></P>
<P class=a1><SPAN lang=EN-US>__fastcall TForm1::TForm1(TComponent*
Owner)</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN
style="mso-spacerun: yes"> </SPAN>:
TForm(Owner)</SPAN></P>
<P class=a1><SPAN lang=EN-US>{</SPAN></P>
<P class=a1><SPAN lang=EN-US>}</SPAN></P>
<P class=a1><SPAN
lang=EN-US>//---------------------------------------------------------------------------</SPAN></P>
<P class=a1><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US>void __fastcall TForm1::FormCreate(TObject
*Sender)</SPAN></P>
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