📄 c++ builder 程序设计实用教程 - jk - 张晋 - 17xie.htm
字号:
lang=EN-US>Form1->MediaPlayer1->AutoEnable=true;</SPAN></P>
<P class=a0><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'">设置组件具有自动检测有效状态的功能</SPAN></P>
<P class=a0><SPAN lang=EN-US>}</SPAN></P>
<P class=a0><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'">在程序的运行过程中，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，在音箱中就会播放声音文件</SPAN><SPAN
lang=EN-US>c:\windows\media \tada.wav</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，在播放的过程中，程序会自动的检测各个按钮的有效状态，如把</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'">按钮设置为无效的状态。如图</SPAN><SPAN
lang=EN-US>8-3</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 - jk - 张晋 - 17xie.files/81c4ea0361.jpg" width=301
v:shapes="_x0000_i1026"></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>8-3<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'">播放文件过程中的按钮有效状态</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'">上面是将组件的</SPAN><SPAN
lang=EN-US>AutoEnable</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属性值设置为</SPAN><SPAN
lang=EN-US>True</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，如果将组件的</SPAN><SPAN
lang=EN-US>AutoEnable</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属性值设置为</SPAN><SPAN
lang=EN-US>False</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">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'">组件就不会自动的检测和设置组件中各个按钮的有效状态，按钮的状态就需要用户自己去设置。</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'">我们把上面的程序代码做一下小改动，如下所示。</SPAN></P>
<P class=a0><SPAN lang=EN-US>void __fastcall TForm1::FormCreate(TObject
*Sender)</SPAN></P>
<P class=a0><SPAN lang=EN-US>{</SPAN></P>
<P class=a0><SPAN
lang=EN-US>Form1->MediaPlayer1->VisibleButtons<<btPause<<btStop<<btStep<<btBack;</SPAN></P>
<P class=a0><SPAN
lang=EN-US>Form1->MediaPlayer1->EnabledButtons<<btPause<<btStop<<btStep<<btBack;</SPAN></P>
<P class=a0><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'">设置处于有效状态的按钮</SPAN></P>
<P class=a0><SPAN
lang=EN-US>Form1->MediaPlayer1->FileName="c:\\pwin98\\media\\tada.wav";</SPAN></P>
<P class=a0><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'">设置播放文件名</SPAN></P>
<P class=a0><SPAN lang=EN-US>Form1->MediaPlayer1->Open();</SPAN></P>
<P class=a0><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'">打开多媒体播放设备</SPAN></P>
<P class=a0><SPAN
lang=EN-US>Form1->MediaPlayer1->AutoEnable=false;</SPAN></P>
<P class=a0><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'">设置组件具有自动检测有效状态的功能</SPAN></P>
<P class=a0><SPAN lang=EN-US>}</SPAN></P>
<P class=a0><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'">做完以上的工作后，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，结果如图</SPAN><SPAN
lang=EN-US>8-4</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 style="MARGIN: 2pt 0cm"><SPAN lang=EN-US><IMG height=192
src="C++ Builder 程序设计实用教程 - jk - 张晋 - 17xie.files/84f7fac686.jpg" width=270
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>8-4<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'">组件的</SPAN><SPAN
lang=EN-US>AutoEnable</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属性值设置为</SPAN><SPAN
lang=EN-US>False</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'">从以上的示例可以看出，当把</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>AutoEnable</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属性值设置为</SPAN><SPAN
lang=EN-US>True</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，系统就会屏蔽程序中有关设置组件按钮状态的代码，反之当把</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>AutoEnable</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属性值设置为</SPAN><SPAN
lang=EN-US>False</SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时，系统不会根据组件的状态来设置按钮的有效状态，这时就需要用户对</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'">组件的按钮进行控制。</SPAN></P>
<P class=MsoNormal><SPAN
lang=EN-US><o:p> </o:p></SPAN></P></DIV></DIV></CENTER>
<HR>
<SPAN id=theurl
style="FONT-SIZE: 12px">本页地址：http://www.17xie.com/read.php?pid=13698</SPAN>
</DIV>
<DIV id=read-title style="BORDER-TOP: white 1px solid">
<DIV
style="PADDING-RIGHT: 0px; PADDING-LEFT: 0px; FLOAT: right; PADDING-BOTTOM: 8px; PADDING-TOP: 8px">
<TABLE>
<TBODY>
<TR>
<TD><NOBR><SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=1'">|<</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=77'">上一页</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=75'">75</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=76'">76</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=77'">77</SPAN>
<SPAN class=page-here
onclick="window.location.href='/read.php?bid=303&seq=78'">78</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=79'">79</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=80'">80</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=81'">81</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=79'">下一页</SPAN>
<SPAN class=page-nor
onclick="window.location.href='/read.php?bid=303&seq=105'">>|</SPAN></NOBR>.</TD>
<TD><INPUT class=input-text
onkeydown='if(window.event.keyCode==13)window.location.href="/read.php?bid=303&seq="+this.value'
style="WIDTH: 25px"></TD>
<TD style="PADDING-TOP: 2px">[共105页]</TD></TR></TBODY></TABLE></DIV></DIV>
<DIV id=read-mpage>
<DIV
style="PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 8px; PADDING-TOP: 8px; TEXT-ALIGN: center">[关注本页]
[在本页中加入书签] [收藏本书] [推荐本书] </DIV></DIV><!-- foot -->
<DIV id=xie_bottom><A class=xie1 href="http://www.17xie.com/help/help-wzjs.html"
target=_blank>关于我们</A> <SPAN class=xiefont1>| </SPAN><A class=xie1
href="http://www.17xie.com/help/index.html" target=_blank>帮助中心</A> <SPAN
class=xiefont1>| </SPAN><A class=xie1
href="http://www.17xie.com/help/help-wzjs.html#m6" target=_blank>版权声明</A> <SPAN
class=xiefont1>| </SPAN><A class=xie1
href="http://www.17xie.com/help/help-wzjs.html#m7" target=_blank>免责声明</A> <SPAN
class=xiefont1>| </SPAN><A class=xie1
href="http://www.17xie.com/help/help-wzjs.html#m8" target=_blank>联系我们</A> <SPAN
class=xiefont1>| </SPAN><A class=xie1
href="http://www.17xie.com/help/help-wzjs.html#m9" target=_blank>友情链接</A> <SPAN
class=xiefont1>| </SPAN><A class=xie1
href="http://www.17xie.com/bbs/show_bbs.php?fid=130"><FONT
color=red>提交意见</FONT></A> <BR>Copyright <SPAN
style="FONT-FAMILY: arial">©</SPAN> 2007 17xie.com 互联网协同写书平台<BR>
<SCRIPT language=javascript
src="C++ Builder 程序设计实用教程 - jk - 张晋 - 17xie.files/1261343.js"
type=text/javascript></SCRIPT>
<NOSCRIPT><A href="http://www.51.la/?1261343" target=_blank><IMG
style="BORDER-TOP-STYLE: none; BORDER-RIGHT-STYLE: none; BORDER-LEFT-STYLE: none; BORDER-BOTTOM-STYLE: none"
alt=我要啦免费统计
src="C++ Builder 程序设计实用教程 - jk - 张晋 - 17xie.files/go.htm"></A></NOSCRIPT>
</DIV></DIV>
<SCRIPT> setInterval("ajax_sr('/live.php','')",600000); function chcolor(sz) { $('read-conts').style.backgroundColor = sz; } function clcp() { var rng = document.body.createTextRange(); rng.moveToElementText(document.getElementById("theurl")); rng.execCommand("Copy"); } document.body.onkeydown = clcp; document.body.onmouseout = clcp; document.body.onclick = clcp; </SCRIPT>
</BODY></HTML>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -