Flex 学习笔记 flexlib控件之_Base64Image(图片Base64互换

开始学习flexlib控件咯！

图片和Base64如何转换，可以使用flexlib:Base64Image控件实现图片转Base64,ImageSnapshot实现Base64转图片。

下面实现方法不一定是最好的，如有更好的方法望大家指点。谢谢！

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
               xmlns:s="library://ns.adobe.com/flex/spark" 
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
               xmlns:flexlib="http://code.google.com/p/flexlib/" >
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
            import flash.utils.ByteArray;
            import mx.utils.Base64Decoder;
            import mx.utils.StringUtil;
            
            import mx.graphics.ImageSnapshot;
            
            [Embed(source="assets/images/aaa.gif")]
            public var cat:Class;
            
            protected function btnSetPic_clickHandler(event:MouseEvent):void
            {
                lib64Img2.source=cat;
            }
            
            protected function ImgToBase64_clickHandler(event:MouseEvent):void
            {
                var ohSnap:ImageSnapshot = ImageSnapshot.captureImage(lib64Img2);
                txta1.text = ImageSnapshot.encodeImageAsBase64(ohSnap);
            }
            
            protected function Base64ToImg_clickHandler(event:MouseEvent):void
            {
                lib64Img.value=txta2.text;
            }

        ]]>
    </fx:Script>
    <s:HGroup>
        <s:Button  y="120" label="设置图片" id="btnSetPic" click="btnSetPic_clickHandler(event)"/>
        <flexlib:Base64Image id="lib64Img2"  width="100" height="100" />
        <s:Button id="Base64ToImg"  label="图片转Base64" click="ImgToBase64_clickHandler(event)" />
        <s:TextArea  id="txta1" width="200" height="100" />
    </s:HGroup>
    <s:HGroup  y="150">
        <s:TextArea  id="txta2" width="200" height="100" />
        <s:Button id="ImgToBase64"  label="Base64转图片" click="Base64ToImg_clickHandler(event)" />
        <flexlib:Base64Image id="lib64Img"  width="100" height="100"/>
    </s:HGroup>

</s:Application>