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📄 c++ builder 程序设计实用教程 - 8_3 midi音乐播放器 - 张晋 - 17xie.htm

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<P class=a1><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=a1><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'">返回音乐文件名</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>Form1-&gt;MediaPlayer1-&gt;Open();</SPAN></P>
<P class=a1><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=a1><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>Form1-&gt;Timer1-&gt;Enabled=true;</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>Form1-&gt;Button2-&gt;Enabled=true;</SPAN></P>
<P class=a1><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'">设置按钮有效状态</SPAN></P>
<P class=a1><SPAN lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp; 
</SPAN>}</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'">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，程序首先设置对话框缺省路径为</SPAN><SPAN 
lang=EN-US>e:\midi</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，对话框的标题是“请选择一个音乐文件名</SPAN><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'">”，在对话框中显示的文件缺省扩展名是</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'">，然后调用</SPAN><SPAN 
lang=EN-US>OpenDialog1</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>Execute()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法来显示一个对话框，在其中用户可以选择一个有效的音乐文件，最后通过</SPAN><SPAN 
lang=EN-US>Form1-&gt;MediaPlayer1-&gt;Open()</SPAN><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，并且设置了按钮的有效状态。</SPAN></P>
<H4><SPAN lang=EN-US>5</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．播放音乐文件</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'">在窗体上的按钮“播放文件”的作用是播放一个用户选中的音乐文件，在</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'">组件中有一个</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'">方法可以在程序运行的过程中播放一个打开的音乐文件，为此，在按钮“播放文件”的响应过程中添加如下代码：</SPAN></P>
<P class=a1><SPAN lang=EN-US>void __fastcall TForm1::Button2Click(TObject 
*Sender)</SPAN></P>
<P class=a1><SPAN lang=EN-US>{</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;MediaPlayer1-&gt;Play();</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'">播放音乐</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;Button3-&gt;Enabled=true;</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;Button4-&gt;Enabled=true;</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'">值得注意的是，在程序的运行过程中，只有用户在对话框中选择一个有效的音乐文件，单击“打开”按钮，才能成功的向系统多媒体设备传送文件的路径和将要打开的文件名，这时单击“播放文件”按钮才能调用</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'">组件中的</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'">方法来播放一个选中的音乐文件。</SPAN></P>
<H4><SPAN lang=EN-US>6</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，如随时显示音乐文件播放进度等。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音乐文件播放的进度，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=a1><SPAN lang=EN-US>void __fastcall TForm1::Timer1Timer(TObject 
*Sender)</SPAN></P>
<P class=a1><SPAN lang=EN-US>{</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;ScrollBar1-&gt;Min=0;</SPAN></P>
<P class=a1><SPAN 
lang=EN-US>Form1-&gt;ScrollBar1-&gt;Max=Form1-&gt;MediaPlayer1-&gt;Length;</SPAN></P>
<P class=a1><SPAN 
lang=EN-US>Form1-&gt;ScrollBar1-&gt;Position=Form1-&gt;MediaPlayer1-&gt;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'">随时跟踪滚动条位置</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'">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，如果组件</SPAN><SPAN 
lang=EN-US>Timer1</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">处于有效的状态，那么每隔</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，通过语句</SPAN><SPAN 
lang=EN-US>Form1-&gt;ScrollBar1-&gt;Position=Form1-&gt;Media 
Player1-&gt;Position;</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在程序中动态的显示音乐文件播放的进度。</SPAN></P>
<H4><SPAN lang=EN-US>7</SPAN><SPAN 
style="FONT-FAMILY: 楷体_GB2312; mso-ascii-font-family: 'Times New Roman'">．调节音乐播放进度</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'">在本示例程序中，对音乐播放进度的调节是通过滚动条来实现，响应滚动条动态拖动的事件是</SPAN><SPAN 
lang=EN-US>ScrollBar1Scroll</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，为此，添加如下所示的代码：</SPAN></P>
<P class=a1><SPAN lang=EN-US>void __fastcall TForm1::ScrollBar1Scroll(TObject 
*Sender,TScrollCode ScrollCode, int &amp;ScrollPos)</SPAN></P>
<P class=a1><SPAN lang=EN-US>{</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;MediaPlayer1-&gt;Pause();</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'">暂停播放</SPAN></P>
<P class=a1><SPAN 
lang=EN-US>Form1-&gt;MediaPlayer1-&gt;Position=Form1-&gt;ScrollBar1-&gt;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'">拖放播放进度</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;MediaPlayer1-&gt;Play();</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'">开始播放</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'">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'">如果在程序运行的过程中用户用鼠标左键拖动滚动条上的滑动块，就会激活组件的</SPAN><SPAN 
lang=EN-US>ScrollBar1Scroll</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">事件，程序首先调用</SPAN><SPAN 
lang=EN-US>MediaPlayer1</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>Pause()</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法来暂停音乐的播放，然后把当前音乐播放的进度通过语句</SPAN><SPAN 
lang=EN-US>Form1-&gt;MediaPlayer1-&gt;Position=Form1-&gt;ScrollBar1 
-&gt;Position</SPAN><SPAN 
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">；调节到当前滑动块的位置，最后调用</SPAN><SPAN 
lang=EN-US>MediaPlayer1</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'">方法重新播放音乐文件。</SPAN></P>
<H4><SPAN lang=EN-US>8</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'">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。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。</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，所以窗体上的“播放文件”、“暂停播放”和“停止播放”等按钮都处于无效的状态。用鼠标的左键单击“打开文件”按钮，在屏幕上就会弹出一个提示用户选择音乐文件的对话框。</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音乐文件，单击“打开”按钮返回到程序运行的画面中，这时窗体上的“播放文件”按钮变为有效的状态，单击“播放文件”按钮，在音箱中就会播放选中的音乐文件，同时滚动条会动态的显示出音乐播放的进度。</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>8-21</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=200 
src="C++ Builder 程序设计实用教程 - 8_3 MIDI音乐播放器 - 张晋 - 17xie.files/d847ba490a.jpg" 
width=284 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>8-21<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=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 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=a1><SPAN 
lang=EN-US>//-----------------------------------------------------------------------</SPAN></P>
<P class=a1><SPAN lang=EN-US>#include &lt;vcl.h&gt;</SPAN></P>
<P class=a1><SPAN lang=EN-US>#pragma hdrstop</SPAN></P>
<P class=a1><SPAN lang=EN-US><o:p>&nbsp;</o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US>#include "Midi.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><o:p>&nbsp;</o:p></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">&nbsp;&nbsp;&nbsp; 
</SPAN><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;</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>&nbsp;</o:p></SPAN></P>
<P class=a1><SPAN lang=EN-US>void __fastcall TForm1::FormCreate(TObject 
*Sender)</SPAN></P>
<P class=a1><SPAN lang=EN-US>{</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;Timer1-&gt;Enabled=false;</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'">设置计时器工作状态</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;Button2-&gt;Enabled=false;</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;Button3-&gt;Enabled=false;</SPAN></P>
<P class=a1><SPAN lang=EN-US>Form1-&gt;Button4-&gt;Enabled=false;</SPAN></P>
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