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背景:在写一个iphone预订程序的时候,发现他的验证码是用base64编码进行传输的,在他的js文件里发现这些:
[code=javascript]
data:image/jpeg;base64,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
[/code]
从Base64String提取图片的话,需要Convert.FromBase64String()方法,实现代码
[code=csharp]
MemoryStream stream = new MemoryStream( Convert.FromBase64String( txtString.Text ) );
bitmap img = new Bitmap( stream );
img.Save( txtImg.Text );
MessageBox.Show( "Completed!" );
[/code]
这是第一次见到这种方式显示验证码的,记录下
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