C# 视频监控系列(4):客户端——音频接收和截图
2009-03-30 22:22
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<a href='http://www.biancheng88.cn/html/2009-3/shipin-jia01.html'>C# 视频监控系列(4):客户端——音频接收和截图</a><br><br><div id="google_ad" style="float: left"><script type="text/javascript"><!--
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<P><STRONG>前言</STRONG></P>
<P> 由于<FONT face=Verdana>音频接收</FONT>这块的代码和说明不多,就和截图功能一起写了,Let's GO! !</P>
<P> </P>
<P><STRONG style="COLOR: red">注意</STRONG></P>
<P> <SPAN style="COLOR: red">本系列文章限于学习交流,注重过程,由于涉及公司,所以不提供源代码下载,非常抱歉!!但是请大家放心,核心、实现以及其他能够贴出来的代码我都会贴出来,并且争取尽所能的回答留言里的每一个问题,感谢大家关注,欢迎交流 :)</SPAN></P>
<P> </P>
<P><STRONG>系列</STRONG></P>
<P> 1. <A class=postTitle2 id=homepage1_HomePageDays_DaysList_ctl00_DayItem_DayList_ctl00_TitleUrl href="http://www.cnblogs.com/over140/archive/2009/02/18/1387448.html">C# 视频监控系列(1):准备</A> </P>
<P> 2. <A title="C# 视频监控系列(2):客户端——封装API" href="http://www.cnblogs.com/over140/archive/2009/02/15/1390890.html">C# 视频监控系列(2):客户端——封装API</A></P>
<P> 3. <A title="C# 视频监控系列(3):客户端——连接服务器" href="http://www.cnblogs.com/over140/archive/2009/02/23/1396571.html">C# 视频监控系列(3):客户端——连接服务器</A></P>
<P> 4. <FONT face=Verdana><A title="C# 视频监控系列(4):客户端——音频接收和截图" href="http://www.cnblogs.com/over140/archive/2009/02/25/1398221.html"><FONT face=Verdana>C# 视频监控系列(4):客户端——音频接收和抓图</FONT></A></FONT></P>
<P> </P>
<P><STRONG>正文</STRONG></P>
<P> 一、 写了三篇文章,来一张界面的草图,让大伙心里有个数。</P>
<P> <IMG height=448 alt="" src="http://images.cnblogs.com/cnblogs_com/over140/2009/2/2009-2-27_1.JPG" width=519 border=0> </P>
<P> 二、 音频接受</P>
<P> 音频接受的代码比较简单,服务器端是默认打开的,只要你将拾音器接上板卡接上标有AID 1/2/3/4白色线就可以了。</P>
<P> VC++ Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">if</SPAN><SPAN style="COLOR: #000000"> (nn1 </SPAN><SPAN style="COLOR: #000000">>=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">0</SPAN><SPAN style="COLOR: #000000"> )<BR> {<BR> MP4_ClientAudioStart(nn1);<BR> MP4_ClientAudioVolume(</SPAN><SPAN style="COLOR: #800080">0xfff0</SPAN><SPAN style="COLOR: #000000">);<BR> }</SPAN></DIV>
<P> C# Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">if</SPAN><SPAN style="COLOR: #000000"> (cs </SPAN><SPAN style="COLOR: #000000">>=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">0</SPAN><SPAN style="COLOR: #000000">)<BR> {<BR> PcHikClient.MP4_ClientAudioStart(cs);<BR> PcHikClient.MP4_ClientAudioVolume(</SPAN><SPAN style="COLOR: #800080">0xffff</SPAN><SPAN style="COLOR: #000000">);<BR> }</SPAN></DIV>
<P> 注意<FONT face=Verdana>MP4_ClientAudioVolume设置的<FONT face=Verdana>音量值范围:(0-0xffff)。</FONT></FONT></P>
<P> 三、 抓图、截图 </P>
<P> VC++ Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #000000">MP4_ClientSetCapPicCallBack(nn1,CapPicFun);<BR><BR></SPAN><SPAN style="COLOR: #0000ff">void</SPAN><SPAN style="COLOR: #000000"> CALLBACK CapPicFun(</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nPort,/<BR> </SPAN><SPAN style="COLOR: #0000ff">char</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN style="COLOR: #000000"> pBuf,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nSize,/<BR> </SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nWidth,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nHeight,/<BR> </SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nStamp,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nType,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nReceaved)<BR>{<BR> </SPAN><SPAN style="COLOR: #0000ff">if</SPAN><SPAN style="COLOR: #000000">(</SPAN><SPAN style="COLOR: #000000">!</SPAN><SPAN style="COLOR: #000000">((g_bCapPic) </SPAN><SPAN style="COLOR: #000000">&&</SPAN><SPAN style="COLOR: #000000"> (nPort </SPAN><SPAN style="COLOR: #000000">==</SPAN><SPAN style="COLOR: #000000"> ipos)))<BR> </SPAN><SPAN style="COLOR: #0000ff">return</SPAN><SPAN style="COLOR: #000000">;<BR> CString csFile;<BR> </SPAN><SPAN style="COLOR: #0000ff">switch</SPAN><SPAN style="COLOR: #000000">(nType)<BR> {<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_UYVY:<BR> csFile</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">c://uyvy.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_YV12:<BR> csFile</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">c://yv12.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_RGB32:<BR> csFile</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">c://rgb.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">default</SPAN><SPAN style="COLOR: #000000">: <BR> </SPAN><SPAN style="COLOR: #0000ff">return</SPAN><SPAN style="COLOR: #000000"> ;<BR> }<BR> MP4_ClientSavePicFile(pBuf,nSize,nWidth,nHeight,nType,csFile.GetBuffer(csFile.GetLength())); <BR> g_bCapPic</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">FALSE;<BR> <BR>}</SPAN></DIV>
<P> 可以看得出,截图是通过回调来实现了,这里注意了,我们在写对应的回调函数的时候,需要把回调实例成成员变量。</P>
<P> C# Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #0000ff"> private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">const</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> T_UYVY </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">1</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">const</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> T_YV12 </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">3</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">const</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> T_RGB32 </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">7</SPAN><SPAN style="COLOR: #000000">;<BR><BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> CapPicFun cpf;<BR><BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">void</SPAN><SPAN style="COLOR: #000000"> button3_Click(</SPAN><SPAN style="COLOR: #0000ff">object</SPAN><SPAN style="COLOR: #000000"> sender, EventArgs e)<BR> {<BR> PcHikClient.MP4_ClientSetCapPicCallBack(cs, cpf);<BR> }<BR><BR> </SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000">public void CapPicFun1(int StockHandle, [MarshalAs(UnmanagedType.LPArray, SizeConst = 152064)] byte[] pBuf, int nSize, int nWidth, int nHeight, int nStamp, int nType, int nReceaved)</SPAN><SPAN style="COLOR: #008000"><BR></SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">public</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">void</SPAN><SPAN style="COLOR: #000000"> CapPicFun1(</SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> StockHandle, IntPtr pBuf, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nSize, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nWidth, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nHeight, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nStamp, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nType, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nReceaved)<BR> {<BR> </SPAN><SPAN style="COLOR: #0000ff">string</SPAN><SPAN style="COLOR: #000000"> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">string</SPAN><SPAN style="COLOR: #000000">.Empty;<BR><BR> </SPAN><SPAN style="COLOR: #0000ff">switch</SPAN><SPAN style="COLOR: #000000"> (nType)<BR> {<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_UYVY:<BR> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800000">@"</SPAN><SPAN style="COLOR: #800000">c:/uyvy.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_YV12:<BR> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800000">@"</SPAN><SPAN style="COLOR: #800000">c:/yv12.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_RGB32:<BR> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800000">@"</SPAN><SPAN style="COLOR: #800000">c:/rgb32.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> }<BR><BR> PcHikClient.MP4_ClientSavePicFile(pBuf, nSize, nWidth, nHeight, nType, csFile);<BR> </SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000">停止执行回调</SPAN><SPAN style="COLOR: #008000"><BR></SPAN><SPAN style="COLOR: #000000"> PcHikClient.MP4_ClientSetCapPicCallBack(cs, </SPAN><SPAN style="COLOR: #0000ff">null</SPAN><SPAN style="COLOR: #000000">);<BR> }</SPAN></DIV>
<P> 代码说明:</P>
<P> 1. button3点击事件对应的是界面上点击截图按钮的事件。</P>
<P> 2. 从API文档中我们可以看到关于<FONT face=Verdana>MP4_ClientSetCapPicCallBack</FONT>的说明:“<FONT face=Verdana><STRONG>注意要尽快返回,如果要停止回调,可以把回调函数指针CapPicFun设为NULL。一旦设置回调函数,则</STRONG></FONT><FONT face=Verdana><STRONG>一直有效,直到程序退出。”。</STRONG></FONT></P>
<P> 3. 请注意在上文的基础上运行客户端连上服务器并显示视频画面后再调用本函数,否则函数既不报错也不会截取图片。</P>
<P> 4. 委托<FONT face=Verdana>private CapPicFun cpf;的实例化我是在<FONT face=Verdana>Form1_Load</FONT>中进行的:<FONT face=Verdana>cpf = new CapPicFun(CapPicFun1);</FONT></FONT></P>
<P> 5. 不出意外的话,按照默认配置您的C盘根目录下应该会有yv12.bmp : )</P>
<P> </P>
<P><STRONG>结束</STRONG></P>
<P><STRONG> </STRONG>截图功能也是在我边写这篇文章的时候边实践的,用原来的API发现能截图并保存,但是图片打开是黑色的,后来修改参数类型才对。当然我也更新了前面的文章的API,希望一直这样比较顺利的完成这系列的文章,不得不夸海康的卡确实做的不错!!</A></P>
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//250x250, 创建于 08-1-11
google_ad_slot = "7793161541";
google_ad_width = 250;
google_ad_height = 250;
//--></script><script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script></div><P> </P>
<P><STRONG>前言</STRONG></P>
<P> 由于<FONT face=Verdana>音频接收</FONT>这块的代码和说明不多,就和截图功能一起写了,Let's GO! !</P>
<P> </P>
<P><STRONG style="COLOR: red">注意</STRONG></P>
<P> <SPAN style="COLOR: red">本系列文章限于学习交流,注重过程,由于涉及公司,所以不提供源代码下载,非常抱歉!!但是请大家放心,核心、实现以及其他能够贴出来的代码我都会贴出来,并且争取尽所能的回答留言里的每一个问题,感谢大家关注,欢迎交流 :)</SPAN></P>
<P> </P>
<P><STRONG>系列</STRONG></P>
<P> 1. <A class=postTitle2 id=homepage1_HomePageDays_DaysList_ctl00_DayItem_DayList_ctl00_TitleUrl href="http://www.cnblogs.com/over140/archive/2009/02/18/1387448.html">C# 视频监控系列(1):准备</A> </P>
<P> 2. <A title="C# 视频监控系列(2):客户端——封装API" href="http://www.cnblogs.com/over140/archive/2009/02/15/1390890.html">C# 视频监控系列(2):客户端——封装API</A></P>
<P> 3. <A title="C# 视频监控系列(3):客户端——连接服务器" href="http://www.cnblogs.com/over140/archive/2009/02/23/1396571.html">C# 视频监控系列(3):客户端——连接服务器</A></P>
<P> 4. <FONT face=Verdana><A title="C# 视频监控系列(4):客户端——音频接收和截图" href="http://www.cnblogs.com/over140/archive/2009/02/25/1398221.html"><FONT face=Verdana>C# 视频监控系列(4):客户端——音频接收和抓图</FONT></A></FONT></P>
<P> </P>
<P><STRONG>正文</STRONG></P>
<P> 一、 写了三篇文章,来一张界面的草图,让大伙心里有个数。</P>
<P> <IMG height=448 alt="" src="http://images.cnblogs.com/cnblogs_com/over140/2009/2/2009-2-27_1.JPG" width=519 border=0> </P>
<P> 二、 音频接受</P>
<P> 音频接受的代码比较简单,服务器端是默认打开的,只要你将拾音器接上板卡接上标有AID 1/2/3/4白色线就可以了。</P>
<P> VC++ Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">if</SPAN><SPAN style="COLOR: #000000"> (nn1 </SPAN><SPAN style="COLOR: #000000">>=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">0</SPAN><SPAN style="COLOR: #000000"> )<BR> {<BR> MP4_ClientAudioStart(nn1);<BR> MP4_ClientAudioVolume(</SPAN><SPAN style="COLOR: #800080">0xfff0</SPAN><SPAN style="COLOR: #000000">);<BR> }</SPAN></DIV>
<P> C# Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">if</SPAN><SPAN style="COLOR: #000000"> (cs </SPAN><SPAN style="COLOR: #000000">>=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">0</SPAN><SPAN style="COLOR: #000000">)<BR> {<BR> PcHikClient.MP4_ClientAudioStart(cs);<BR> PcHikClient.MP4_ClientAudioVolume(</SPAN><SPAN style="COLOR: #800080">0xffff</SPAN><SPAN style="COLOR: #000000">);<BR> }</SPAN></DIV>
<P> 注意<FONT face=Verdana>MP4_ClientAudioVolume设置的<FONT face=Verdana>音量值范围:(0-0xffff)。</FONT></FONT></P>
<P> 三、 抓图、截图 </P>
<P> VC++ Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #000000">MP4_ClientSetCapPicCallBack(nn1,CapPicFun);<BR><BR></SPAN><SPAN style="COLOR: #0000ff">void</SPAN><SPAN style="COLOR: #000000"> CALLBACK CapPicFun(</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nPort,/<BR> </SPAN><SPAN style="COLOR: #0000ff">char</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #000000">*</SPAN><SPAN style="COLOR: #000000"> pBuf,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nSize,/<BR> </SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nWidth,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nHeight,/<BR> </SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nStamp,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nType,</SPAN><SPAN style="COLOR: #0000ff">long</SPAN><SPAN style="COLOR: #000000"> nReceaved)<BR>{<BR> </SPAN><SPAN style="COLOR: #0000ff">if</SPAN><SPAN style="COLOR: #000000">(</SPAN><SPAN style="COLOR: #000000">!</SPAN><SPAN style="COLOR: #000000">((g_bCapPic) </SPAN><SPAN style="COLOR: #000000">&&</SPAN><SPAN style="COLOR: #000000"> (nPort </SPAN><SPAN style="COLOR: #000000">==</SPAN><SPAN style="COLOR: #000000"> ipos)))<BR> </SPAN><SPAN style="COLOR: #0000ff">return</SPAN><SPAN style="COLOR: #000000">;<BR> CString csFile;<BR> </SPAN><SPAN style="COLOR: #0000ff">switch</SPAN><SPAN style="COLOR: #000000">(nType)<BR> {<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_UYVY:<BR> csFile</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">c://uyvy.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_YV12:<BR> csFile</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">c://yv12.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_RGB32:<BR> csFile</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #800000">c://rgb.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">default</SPAN><SPAN style="COLOR: #000000">: <BR> </SPAN><SPAN style="COLOR: #0000ff">return</SPAN><SPAN style="COLOR: #000000"> ;<BR> }<BR> MP4_ClientSavePicFile(pBuf,nSize,nWidth,nHeight,nType,csFile.GetBuffer(csFile.GetLength())); <BR> g_bCapPic</SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000">FALSE;<BR> <BR>}</SPAN></DIV>
<P> 可以看得出,截图是通过回调来实现了,这里注意了,我们在写对应的回调函数的时候,需要把回调实例成成员变量。</P>
<P> C# Code:</P>
<DIV class=cnblogs_code><!--<br /><br />Code highlighting produced by Actipro CodeHighlighter (freeware)<br />http://www.CodeHighlighter.com/<br /><br />--><SPAN style="COLOR: #0000ff"> private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">const</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> T_UYVY </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">1</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">const</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> T_YV12 </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">3</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">const</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> T_RGB32 </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800080">7</SPAN><SPAN style="COLOR: #000000">;<BR><BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> CapPicFun cpf;<BR><BR> </SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">void</SPAN><SPAN style="COLOR: #000000"> button3_Click(</SPAN><SPAN style="COLOR: #0000ff">object</SPAN><SPAN style="COLOR: #000000"> sender, EventArgs e)<BR> {<BR> PcHikClient.MP4_ClientSetCapPicCallBack(cs, cpf);<BR> }<BR><BR> </SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000">public void CapPicFun1(int StockHandle, [MarshalAs(UnmanagedType.LPArray, SizeConst = 152064)] byte[] pBuf, int nSize, int nWidth, int nHeight, int nStamp, int nType, int nReceaved)</SPAN><SPAN style="COLOR: #008000"><BR></SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">public</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">void</SPAN><SPAN style="COLOR: #000000"> CapPicFun1(</SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> StockHandle, IntPtr pBuf, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nSize, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nWidth, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nHeight, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nStamp, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nType, </SPAN><SPAN style="COLOR: #0000ff">int</SPAN><SPAN style="COLOR: #000000"> nReceaved)<BR> {<BR> </SPAN><SPAN style="COLOR: #0000ff">string</SPAN><SPAN style="COLOR: #000000"> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #0000ff">string</SPAN><SPAN style="COLOR: #000000">.Empty;<BR><BR> </SPAN><SPAN style="COLOR: #0000ff">switch</SPAN><SPAN style="COLOR: #000000"> (nType)<BR> {<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_UYVY:<BR> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800000">@"</SPAN><SPAN style="COLOR: #800000">c:/uyvy.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_YV12:<BR> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800000">@"</SPAN><SPAN style="COLOR: #800000">c:/yv12.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">case</SPAN><SPAN style="COLOR: #000000"> T_RGB32:<BR> csFile </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN style="COLOR: #000000"> </SPAN><SPAN style="COLOR: #800000">@"</SPAN><SPAN style="COLOR: #800000">c:/rgb32.bmp</SPAN><SPAN style="COLOR: #800000">"</SPAN><SPAN style="COLOR: #000000">;<BR> </SPAN><SPAN style="COLOR: #0000ff">break</SPAN><SPAN style="COLOR: #000000">;<BR> }<BR><BR> PcHikClient.MP4_ClientSavePicFile(pBuf, nSize, nWidth, nHeight, nType, csFile);<BR> </SPAN><SPAN style="COLOR: #008000">//</SPAN><SPAN style="COLOR: #008000">停止执行回调</SPAN><SPAN style="COLOR: #008000"><BR></SPAN><SPAN style="COLOR: #000000"> PcHikClient.MP4_ClientSetCapPicCallBack(cs, </SPAN><SPAN style="COLOR: #0000ff">null</SPAN><SPAN style="COLOR: #000000">);<BR> }</SPAN></DIV>
<P> 代码说明:</P>
<P> 1. button3点击事件对应的是界面上点击截图按钮的事件。</P>
<P> 2. 从API文档中我们可以看到关于<FONT face=Verdana>MP4_ClientSetCapPicCallBack</FONT>的说明:“<FONT face=Verdana><STRONG>注意要尽快返回,如果要停止回调,可以把回调函数指针CapPicFun设为NULL。一旦设置回调函数,则</STRONG></FONT><FONT face=Verdana><STRONG>一直有效,直到程序退出。”。</STRONG></FONT></P>
<P> 3. 请注意在上文的基础上运行客户端连上服务器并显示视频画面后再调用本函数,否则函数既不报错也不会截取图片。</P>
<P> 4. 委托<FONT face=Verdana>private CapPicFun cpf;的实例化我是在<FONT face=Verdana>Form1_Load</FONT>中进行的:<FONT face=Verdana>cpf = new CapPicFun(CapPicFun1);</FONT></FONT></P>
<P> 5. 不出意外的话,按照默认配置您的C盘根目录下应该会有yv12.bmp : )</P>
<P> </P>
<P><STRONG>结束</STRONG></P>
<P><STRONG> </STRONG>截图功能也是在我边写这篇文章的时候边实践的,用原来的API发现能截图并保存,但是图片打开是黑色的,后来修改参数类型才对。当然我也更新了前面的文章的API,希望一直这样比较顺利的完成这系列的文章,不得不夸海康的卡确实做的不错!!</A></P>
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