c++ builder 程序设计实用教程 - 8_2 声音文件播放器 - 张晋 - 17xie.htm

已经消失的不易找到的C++ builder网络教程总结

lang=EN-US>//-----------------------------------------------------------------------</SPAN></P>
<H4><SPAN lang=EN-US>4</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．响应“打开”按钮</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“打开文件”的按钮上双击鼠标的左键，就会弹出一个如图</SPAN><SPAN 
lang=EN-US>8-14</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示的代码窗口，在其中就可以添加对按钮“打开文件”的响应代码如下所示。</SPAN></P>
<P class=a3><SPAN lang=EN-US>void __fastcall TForm1::Button1Click(TObject 
*Sender)</SPAN></P>
<P class=a3><SPAN lang=EN-US>{</SPAN></P>
<P class=a3><SPAN lang=EN-US>if (Form1-&gt;OpenDialog1-&gt;Execute())</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">打开一个对话框</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>{</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>Form1-&gt;MediaPlayer1-&gt;FileName=Form1-&gt;OpenDialog1-&gt;FileName;</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设置播放文件</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>Form1-&gt;MediaPlayer1-&gt;Open();</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>//</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">打开多媒体播放设备</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>Form1-&gt;Timer1-&gt;Enabled=true;</SPAN></P>
<P class=a3><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>//</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 style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>}</SPAN></P>
<P class=a3><SPAN lang=EN-US>}</SPAN></P>
<P class=a3><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'">程序说明：</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'">在程序运行的过程中，如果用户用鼠标的左键单击按钮“打开文件”，就会激活组件的</SPAN><SPAN 
lang=EN-US>Button1Click()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事件，然后程序通过语句：</SPAN></P>
<P class=MsoNormalIndent><SPAN 
lang=EN-US>Form1-&gt;OpenDialog1-&gt;Execute();</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'">来打开一个对话框，在其中用户可以选择一个有效的声音文件，最后通过：</SPAN></P>
<P class=MsoNormalIndent><SPAN 
lang=EN-US>Form1-&gt;MediaPlayer1-&gt;FileName</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">　</SPAN><SPAN 
lang=EN-US>=Form1-&gt;OpenDialog1-&gt;FileName;</SPAN></P>
<P class=MsoNormalIndent><SPAN 
lang=EN-US>Form1-&gt;MediaPlayer1-&gt;Open();</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'">来打开一个多媒体播放设备。其中代码窗口如图</SPAN><SPAN 
lang=EN-US>8-15</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=255 
src="C++ Builder 程序设计实用教程 - 8_2 声音文件播放器 - 张晋 - 17xie.files/c3a038edd6.jpg" 
width=357 v:shapes="_x0000_i1027"></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>8-15<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">程序中的代码窗口</SPAN></P>
<H4><SPAN lang=EN-US>5</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．响应计时器事件</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'">窗体上</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'">组件的作用是为程序运行提供时间控制，如随时显示声音文件播放进度等，为此就需要在程序的设计阶段将</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'">组件设置为有效的状态，并且为组件指定一个响应的时间长度。</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'">在本示例程序中，</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'">组件的时间控制设置为</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'">，它的意思是在程序运行的过程中，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，为了在程序中动态的显示声音文件播放的进度，可以在</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'">事件中添加如下代码：</SPAN></P>
<P class=a3><SPAN lang=EN-US>void __fastcall TForm1::Timer1Timer(TObject 
*Sender)</SPAN></P>
<P class=a3><SPAN lang=EN-US>{</SPAN></P>
<P class=a3><SPAN lang=EN-US>Form1-&gt;TrackBar1-&gt;Min=0;</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'">设置滑动条最小值</SPAN></P>
<P class=a3><SPAN 
lang=EN-US>Form1-&gt;TrackBar1-&gt;Max=Form1-&gt;MediaPlayer1-&gt;Length;</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'">设置滑动条最大值</SPAN></P>
<P class=a3><SPAN 
lang=EN-US>Form1-&gt;TrackBar1-&gt;Position=Form1-&gt;MediaPlayer1-&gt;Position;</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'">设置滑动条的位置</SPAN></P>
<P class=a3><SPAN lang=EN-US>}</SPAN></P>
<P class=a3><SPAN 
lang=EN-US>//-----------------------------------------------------------------------</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=a0><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">提示：</SPAN></P>
<P class=a1><SPAN lang=EN-US 
style="FONT-FAMILY: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings"><SPAN 
style="mso-list: Ignore">@<SPAN 
style="FONT: 7pt 'Times New Roman'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
</SPAN></SPAN></SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">在这里对程序其它代码的添加过程就不一一加以介绍了，如果读者有什么不清楚之处，请参看附后的源程序代码。</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'">做完以上的工作后，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，程序运行的初始画面如图</SPAN><SPAN 
lang=EN-US>8-16</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=212 
src="C++ Builder 程序设计实用教程 - 8_2 声音文件播放器 - 张晋 - 17xie.files/da6c892306.jpg" 
width=317 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>8-16<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">程序运行的初始画面</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'">在程序运行的过程中，由于没有给多媒体播放设备指定程序播放文件，所以</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'">组件的</SPAN><SPAN 
lang=EN-US>Play</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</SPAN><SPAN 
lang=EN-US>Pause</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN 
lang=EN-US>Stop</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">等按钮都处于无效的状态。</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'">用鼠标的左键单击“打开文件”按钮，在屏幕上就会弹出一个如图</SPAN><SPAN 
lang=EN-US>8-17</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">所示的对话框。</SPAN></P>
<P class=a><SPAN lang=EN-US><IMG height=166 
src="C++ Builder 程序设计实用教程 - 8_2 声音文件播放器 - 张晋 - 17xie.files/e2efddb081.jpg" 
width=322 v:shapes="_x0000_i1029"></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>8-17<SPAN style="mso-spacerun: yes">&nbsp; </SPAN></SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">打开文件对话框</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'">在打开文件的对话框中用键盘输入一个路径和文件名，或者用鼠标来选择一个有效的声音文件，单击“打开”按钮返回到程序运行的画面中，这时</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'">组件的</SPAN><SPAN 
lang=EN-US>Play</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">按钮变为有效的状态。</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'">单击</SPAN><SPAN 
lang=EN-US>Play</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">按钮，在音箱中就会播放选中的声音文件，同时滑动条会动态的显示处声音播放的进度。</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'">程序运行结果如图</SPAN><SPAN 
lang=EN-US>8-18</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=198 
src="C++ Builder 程序设计实用教程 - 8_2 声音文件播放器 - 张晋 - 17xie.files/861ac34871.jpg" 
width=296 v:shapes="_x0000_i1030"></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>8-18<SPAN style="mso-spacerun: yes">&nbsp; </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'">示例程序中的完整代码如下所示。</SPAN></P>
<DIV 
style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 0cm; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 0cm; PADDING-BOTTOM: 1pt; BORDER-LEFT: windowtext 1pt solid; PADDING-TOP: 1pt; BORDER-BOTTOM: windowtext 1pt solid; mso-border-alt: solid windowtext .5pt; mso-element: para-border-div">
<P class=a2 
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 0cm 1.0pt 0cm"><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=a3><SPAN 
lang=EN-US>//-----------------------------------------------------------------------</SPAN></P>
<P class=a3><SPAN lang=EN-US>#include &lt;vcl.h&gt;</SPAN></P>
<P class=a3><SPAN lang=EN-US>#pragma hdrstop</SPAN></P>
<P class=a3><SPAN lang=EN-US><o:p>&nbsp;</o:p></SPAN></P>
<P class=a3><SPAN lang=EN-US>#include "Wave.h"</SPAN></P>
<P class=a3><SPAN 
lang=EN-US>//-----------------------------------------------------------------------</SPAN></P>
<P class=a3><SPAN lang=EN-US>#pragma package(smart_init)</SPAN></P>
<P class=a3><SPAN lang=EN-US>#pragma resource "*.dfm"</SPAN></P>