📄 wince系统音量的设置.htm
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 0px; PADDING-BOTTOM: 0px; PADDING-TOP: 0px">【标 题】：WinCE系统音量的设置<BR>【关键字】：<B>WinCE</B><BR>【来 源】：http://blog.csdn.net/norains/archive/2007/04/08/1556912.aspx<BR>
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<H1>WinCE系统音量的设置</H1></DIV>
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//========================================================================<BR>//TITLE:<BR>//
WinCE系统音量的设置<BR>//AUTHOR:<BR>//
norains<BR>//DATE:<BR>// Sunday
8-April-2007<BR>//Environment:<BR>// EVC4.0
+ Standard SDK 4.2<BR>// EVC4.0 + Standard
SDK
5.0<BR>//========================================================================<BR><BR>
首先我们来看一段最简单的改变音量的代码:<BR>
<DIV
style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: rgb(230,230,230) 0% 50%; PADDING-BOTTOM: 4px; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 95%; PADDING-TOP: 4px; BORDER-BOTTOM: windowtext 0.5pt solid; moz-background-clip: -moz-initial; moz-background-origin: -moz-initial; moz-background-inline-policy: -moz-initial">
<DIV><IMG alt="" src="WinCE系统音量的设置.files/None.gif" align=top><SPAN
style="COLOR: rgb(0,0,0)"> DWORD dwVolume </SPAN><SPAN
style="COLOR: rgb(0,0,0)">=</SPAN><SPAN
style="COLOR: rgb(0,0,0)"> </SPAN><SPAN
style="COLOR: rgb(0,0,0)">0xAAAAAAAA</SPAN><SPAN
style="COLOR: rgb(0,0,0)">;<BR><IMG alt="" src="WinCE系统音量的设置.files/None.gif"
align=top> waveOutSetVolume(</SPAN><SPAN
style="COLOR: rgb(0,0,0)">0</SPAN><SPAN
style="COLOR: rgb(0,0,0)">,dwVolume);</SPAN></DIV></DIV><BR>
<BR>
waveOutSetVolume()的第一个参数是设备ID,因为需要更改的是整个系统音量,所以在这里直接取0值即可;第二个参数是需要设置的音量数值,范围是从
0x0 ~ 0xFFFFFFFF.<BR>
<BR>
但这个函数的功能却也是非常有限的,也就是说,它只能更改系统的主音量;如果想修改屏幕点击声,则就无能为力.<BR>
<BR>
有些细心的朋友会从"控制面板"的"声音"入手,发现每次在控制面板调节声音,相应的"ControlPanel\Volume"下的键值数值都会变更.但如果是直接修其下的改注册表,却是无论如何都达不到相应的功能的----因为没有通知系统,注册表已经被修改.<BR>
<BR>
如果需要告知系统,注册表已经修改,并请系统依照修改的数值来更改音量,则需要调用微软一个未公开的函数:AudioUpdateFromRegistry().<BR>
<BR>
这个函数在文档中是无法搜索到,如果需要调用这个函数,可以有两种方法.<BR>
<BR>
一是直接包含"pwinuser.h"文件,然后直接调用.<BR>
<BR>
二是调用coredll.dll库,引出该函数并使用.<BR>
<BR> 这里展示一个调用的例子:<BR>
<DIV
style="BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: rgb(230,230,230) 0% 50%; PADDING-BOTTOM: 4px; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 95%; PADDING-TOP: 4px; BORDER-BOTTOM: windowtext 0.5pt solid; moz-background-clip: -moz-initial; moz-background-origin: -moz-initial; moz-background-inline-policy: -moz-initial">
<DIV><IMG alt="" src="WinCE系统音量的设置.files/None.gif" align=top><SPAN
style="COLOR: rgb(0,0,0)"> typedef </SPAN><SPAN
style="COLOR: rgb(0,0,255)">void</SPAN><SPAN
style="COLOR: rgb(0,0,0)"> (WINAPI </SPAN><SPAN
style="COLOR: rgb(0,0,0)">*</SPAN><SPAN
style="COLOR: rgb(0,0,0)">DLL_AUDIOUPDATEFROMREGISTRY)();<BR><IMG alt=""
src="WinCE系统音量的设置.files/None.gif" align=top><BR><IMG alt=""
src="WinCE系统音量的设置.files/None.gif"
align=top> DLL_AUDIOUPDATEFROMREGISTRY Dll_AudioUpdateFromRegistry </SPAN><SPAN
style="COLOR: rgb(0,0,0)">=</SPAN><SPAN
style="COLOR: rgb(0,0,0)"> NULL; <BR><IMG alt=""
src="WinCE系统音量的设置.files/None.gif"
align=top> HINSTANCE hCoreDll </SPAN><SPAN
style="COLOR: rgb(0,0,0)">=</SPAN><SPAN
style="COLOR: rgb(0,0,0)"> LoadLibrary(TEXT(</SPAN><SPAN
style="COLOR: rgb(0,0,0)">"</SPAN><SPAN
style="COLOR: rgb(0,0,0)">coredll.dll</SPAN><SPAN
style="COLOR: rgb(0,0,0)">"</SPAN><SPAN
style="COLOR: rgb(0,0,0)">)); <BR><IMG alt=""
src="WinCE系统音量的设置.files/None.gif"
align=top> </SPAN><SPAN
style="COLOR: rgb(0,0,255)">if</SPAN><SPAN
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