Base64 UTF-8到映像 [英] Base64 UTF-8 to Image

问题描述

嗨
我正在尝试转换已使用UTF-8存储的Base64 gif图像.我收到一个错误参数无效"，我不确定我要去哪里.

 公共 功能 Base64toImage( ByVal  Base64  As  字符串) As  System.Drawing.Image
     Dim  imgSig  As  System.Drawing.Image
     Dim  MemStream  As  System.IO.MemoryStream = >新 System.IO.MemoryStream
     Dim  utf8  As  UTF8Encoding = 新 UTF8Encoding( )

    ' 将Base64字符串转换为内存流
    MemStream = 新建 System.IO.MemoryStream(utf8.GetBytes(Base64))

    ' 创建图片
    imgSig = System.Drawing.Image.FromStream(MemStream)

    MemStream.Close()
    返回 imgSig
结束 功能 

在此先感谢

Marco

解决方案

像utf8一样看起来像我.GetBytes不会返回有效的图像，您需要处理转换，以便结果是gif. /blockquote>

Christian Graus是正确的utf8.GetBytes没有返回有效的图像文件.它正在返回(PersistenceFormat.Base64InkSerializedFormat)我的坏:〜

我做了如何解决此问题的方法，请查看 InkCollector签名变得简单 [

Public Function Base64toImage(ByVal Base64 As String) As System.Drawing.Image
    Dim imgSig As System.Drawing.Image
    Dim MemStream As System.IO.MemoryStream = New System.IO.MemoryStream
    Dim utf8 As UTF8Encoding = New UTF8Encoding()

    'Convert Base64 string to Memory Stream
    MemStream = New System.IO.MemoryStream(utf8.GetBytes(Base64))

    'creates image
    imgSig = System.Drawing.Image.FromStream(MemStream)

    MemStream.Close()
    Return imgSig
End Function

Thanks in Advance

Marco

解决方案

Looks to me like utf8.GetBytes does not return a valid image, you''ll need to handle the conversion so that the result is a gif.

Christian Graus was correct utf8.GetBytes was not returning a valid image file. It was returning (PersistenceFormat.Base64InkSerializedFormat) My Bad:~

I did how ever resolve this matter, have a look at InkCollector Signiture Made Easy[^]

Marco

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