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	<title>中文Flex例子 &#187; 屏幕截图</title>
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		<title>在Flex中获取一个屏幕截图(Screenshot)并将其传递给ASP.NET</title>
		<link>http://blog.minidx.com/2008/04/26/776.html</link>
		<comments>http://blog.minidx.com/2008/04/26/776.html#comments</comments>
		<pubDate>Sat, 26 Apr 2008 11:21:26 +0000</pubDate>
		<dc:creator>Minidxer</dc:creator>
				<category><![CDATA[Flex]]></category>
		<category><![CDATA[Adobe]]></category>
		<category><![CDATA[ASP.NET]]></category>
		<category><![CDATA[bitmap]]></category>
		<category><![CDATA[ImageSnapshot]]></category>
		<category><![CDATA[Screenshot]]></category>
		<category><![CDATA[屏幕截图]]></category>

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		<description><![CDATA[在Adobe Flex 3中，你可以通过下面的代码获取任何控件并保存为bitmap图片（需要import &#8220;mx.graphics.ImageSnapshot&#8221;，想必大名鼎鼎的snapshot大家都应该知道吧？）。
var snapshot:ImageSnapshot =&#160; ImageSnapshot.captureImage(backgroundCanvas);
默认的话，使用的是PNG格式的编码。如果你想将图片传递到服务器端，那就用下面的代码：








var req:URLRequest = new URLRequest();
req.method = URLRequestMethod.POST;
req.data = snapshot.data;
req.contentType=&#34;application/octet-stream&#34;;
req.url = &#34;snapshotuploadhandler.aspx&#34;;
var&#160;loader:URLLoader = new URLLoader;
loader.load(req);
在ASP.NET中读取上传了的文件是非常轻松的，代码如下：
private byte[] readPostedFile()
{
&#160;&#160; if&#160;(Request.ContentLength &#62; 0)
&#160;&#160; {
&#160; &#160; &#160;&#160; byte[]&#160;buffer = new byte[Request.ContentLength];
&#160; &#160; &#160;&#160; using&#160;(BinaryReader br = new BinaryReader(Request.InputStream))
&#160; &#160; &#160; &#160; &#160;&#160; br.Read(buffer, 0, buffer.Length);
&#160; &#160; &#160;&#160; return&#160;buffer;
&#160;&#160; }
&#160;&#160; else
&#160;&#160; {
&#160; &#160; &#160;&#160; return&#160;null;
&#160;&#160; [...]]]></description>
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