无法将图片保存为图片

我想从多部分混合内容中获取图片，我可以获取该图片但至今无法将其转换为图片。我得到的错误是：无法将图片保存为图片

A first chance exception of type 'System.ArgumentException' occurred 
    in System.Drawing.dll 

    Additional information: Parameter is not valid.

下面是相关代码到不能行：

Image img; 

using (var stream = File.Open(@"C:\temp\in_mms.txt", FileMode.Open)) 
     { 
      var content2 = new StreamContent(stream) ; 
      content2.Headers.ContentType = 
       System.Net.Http.Headers.MediaTypeHeaderValue.Parse (
        "multipart/related; boundary=cbsms-main-boundary"); 

      var multipart = await content2.ReadAsMultipartAsync(); 

      foreach (StreamContent part in multipart.Contents) 
      { 
       if (part.Headers.ContentType.MediaType == "multipart/mixed") 
       { 
        Stream y = await part.ReadAsStreamAsync(); 
        y.Position = 0; 

        if (part.IsMimeMultipartContent()) 
         await part.ReadAsMultipartAsync(StreamProvider); 

        foreach (var mixedContent in StreamProvider.Contents) 
        { 
         if (mixedContent.Headers.ContentType.MediaType == "image/jpeg" 
         || mixedContent.Headers.ContentType.MediaType == "image/png" 
         || mixedContent.Headers.ContentType.MediaType == "image/gif") 
         { 
          //save image 
          Stream x = await mixedContent.ReadAsStreamAsync(); 
          x.Position = 0; 
          img = Image.FromStream(x);

，是我试图从获得的图像文本文件：

Cache-Control: no-cache 
Connection: Close 
Content-Length: 5216 
Content-Type: multipart/related; 
    boundary="cbsms-main-boundary"; 
    start="<soap-envelope>", text/xml; 
    charset=utf-8 
Accept: */* 
Host: hostname 
User-Agent: Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) 
soapaction: "" 

This is a multi-part message in MIME format. 

--cbsms-main-boundary 
Content-Type: text/xml; 
    charset="utf-8" 
Content-ID: <soap-envelope> 

<?xml version="1.0" encoding="UTF-8"?> 
<SOAP-ENV:Envelope 
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> 
<SOAP-ENV:Header> 
<mm7:TransactionID 
xmlns:mm7="http://www.3gpp.org/ftp/Specs/archive/23_series/23.140/schema/REL 
-6-MM7-1-2">5947CCE35D5B4AEFB99DADDDF9472E67</mm7:TransactionID> 
</SOAP-ENV:Header> 
<SOAP-ENV:Body> 
<mm7:DeliverReq 
xmlns:mm7="http://www.3gpp.org/ftp/Specs/archive/23_series/23.140/schema/REL 
-6-MM7-1-2"> 
<mm7:MM7Version>6.5.0</mm7:MM7Version> 
<mm7:MMSRelayServerID>hostname</mm7:MMSRelayServerID> 
<mm7:LinkedID>1-1754394156</mm7:LinkedID> 
<mm7:SenderAddress> 
<mm7:Number>46707630767</mm7:Number> 
</mm7:SenderAddress> 
<mm7:Recipients> 
<mm7:To> 
<mm7:Number>72401</mm7:Number> 
</mm7:To> 
</mm7:Recipients> 
<mm7:TimeStamp>2008-05-08 11:16:39</mm7:TimeStamp> <mm7:Priority>Normal</mm7:Priority> 
<mm7:Subject>Tube test</mm7:Subject> 
</mm7:DeliverReq> 
</SOAP-ENV:Body> 
</SOAP-ENV:Envelope> 

--cbsms-main-boundary 
Content-Type: multipart/mixed; 
    boundary="cbsms-sub-boundary" 
Content-ID: <MM7-Media> 

--cbsms-sub-boundary 
content-type: application/smil; 
    Name=main.smil;Charset=utf-8 
content-transfer-encoding: 7bit 
content-id: <AAAA> 
content-length: 483 

<smil><head><layout><root-layout backgroundColor="#FFFFFF" 
background-color="#FFFFFF" height="480px" width="640px"/> <region id="Image" top="0" left="0" height="50%" width="100%" fit="meet"/> <region id="Text" top="50%" left="0" height="50%" width="100%" 
fit="scroll"/> 
</layout> 
</head> 
<body><par dur="4000ms"><img src="smslogo.jpg" region="Image"></img> <text src="smil.txt" region="Text"><param name="foreground-color" 
value="#000000"/> 
</text> 
</par> 
</body> 
</smil> 

--cbsms-sub-boundary 
content-type: image/jpeg; 
    Name=smslogo.jpg 
content-transfer-encoding: Base64 
content-location: smslogo.jpg 
content-length: 2218 

/9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAKgAA/+4ADkFkb2JlAGTAAAAA 
Af/bAIQACwgICAgICwgICxAKCQoQEw4LCw4TFhERExERFhUREhISEhEVFRkaGxoZFSEhJCQh 
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AQEAAAAAAAAAAAAAAAUAAQIEBgcDAQEBAQEBAAAAAAAAAAAAAAABAAIDBBAAAQMCAwQDCgkK 
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mt6xDGIYrl7YxgKUrTu7VXfJd3j89xI6V295JQ1uwba3lk/t5dz1+04rX5vO95YUlG3dH/bi 
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NO200QVz35MVPHpHJWnVRle8kkg9tq44+UfwJMxk38Bw4klJq5uM2mFOJ97/AIokkkp0+3p+ 
OD//2Q== 

--cbsms-sub-boundary 
content-type: text/plain; 
    Name=smil.txt;Charset=utf-8 
content-transfer-encoding: 7bit 
content-location: smil.txt 
content-length: 9 

Tube test 
--cbsms-sub-boundary-- 

--cbsms-main-boundary--

当我通过代码，我得到下面的头值步骤：

{content-type: image/jpeg; Name=smslogo.jpg 
content-transfer-encoding: Base64 
content-location: smslogo.jpg 
content-length: 2218 
}

编辑：

我试图挽救这样的形象：

img.Save(@"C:\temp\filename.jpg", ImageFormat.Jpeg);

但我得到的错误：

A generic error occurred in GDI+.

我可以证实，该图像是一个有效的图像，因为我能够使用第三方组件提取它。

来源

2014-01-08 user517406

您的代码不完整。 –

在失败点之前添加更多代码 – user517406

你有什么是一个基地64编码图像。获取文本的这部分作为字符串：

/9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAKgAA/+4ADkFkb2JlAGTAAAAA 
Af/bAIQACwgICAgICwgICxAKCQoQEw4LCw4TFhERExERFhUREhISEhEVFRkaGxoZFSEhJCQh 
ITAvLy8wNjY2NjY2NjY2NgEMCgoMDQwPDQ0PEw4ODhMUDg8PDhQaEhIUEhIaIhgVFRUVGCIe 
IBsbGyAeJSUiIiUlLy8sLy82NjY2NjY2NjY2/8AAEQgAZgBmAwEiAAIRAQMRAf/EAJ4AAAEF 
AQEAAAAAAAAAAAAAAAUAAQIEBgcDAQEBAQEBAAAAAAAAAAAAAAABAAIDBBAAAQMCAwQDCgkK 
BwAAAAAAAQACAxEEIRIFMVETBkFhgXGRsSJCYrKT0xSh0TJScpIjMxbB4YKiJBUlNVUX8NJT 
g6MmNhEBAAECBAQEBwAAAAAAAAAAAAERAiExcRKBkTKTQVGy0vAiQpKiAxP/2gAMAwEAAhED 
EQA/ANDzDzHJYzughLpbx7i2KBhNTjhWnQvDTZ9bawy6jeOkkfiIG0DWV6KgVJ7VK5srePV7 
y+pmuJXUzHyWgBuVvdopV3Iea+67dOMxSfBfglvrh+SOV2HynEmgCLxxNYwB73vd0uLnDwFU 
rTLBC1o2nFx6yvbjpbtmfOVrJF5313fGmyR73fXd8ar8brS4oU1uWMke9313fGn4cW9313fG 
q4lT8UKVVgRxed9d3xrwurWV7c1rM9jx5BcS09pSEoUhKpVnzAp7i/aHwunkhk2Zh8oHeM1Q 
VnRzFrmj3ot9ZuHT2kx+xu2gNA6nBtO1ba/t23cdR9635B39SzV3bQXsD7W5ZnjfgQdoO8dY 
Q5XTdE1rPNp4tQe7Qp7svwZlIfXySW41SQG30iT8CXWk8bHiNbxca8Pjtf6GFEkuu+fw3cU7 
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S5/saTQYszp5t2WNp+ErUBpDQNwog2gQFlnDUYyEyO7diO0QYikL1vX9z3W/O3wtSUbe4i/c 
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XYtIPcNfAuCcN4+SSFNs14zBkz2jqcQh2/q6fzzrFvZaTLYNeDdXVG8MGpaytS526q5pbAuo 
OlxA768C2WR2aQlx3nFWWNytoqjF11ZdHsYhG0MbsjaGjsS1K9j06zkuJDRzQRG07XOOwBYV 
mt6xDGIYrl7YxgKUrTu7VXfJd3j89xI6V295JQ1uwba3lk/t5dz1+04rX5vO95YUlG3dH/bi 
78cZM7W5uivvDG07+CSm6+g/NMHLz9QmJuuFdVHGGWQ40G5pGxARZ6B5WoU/25P8iSSoN2c9 
HFMWXLPlaifVy+zTiy5T8rUj6qX2aSSebPbSFjyf06mfVTezT+5cm/1N3qpvZpJK5jtF7lyd 
/U3eqm9mn9y5O/qZ9VN7NJJXM9s3uPKNcNTPqpfZpjZcr9GpH1Uvs0klc120DZ8u+TqP/HJ7 
NO200QVz35MVPHpHJWnVRle8kkg9tq44+UfwJMxk38Bw4klJq5uM2mFOJ97/AIokkkp0+3p+ 
OD//2Q==

这是编码的实际图像。试试这个：

byte[] base64Bytes = await mixedContent.ReadAsByteArrayAsync(); 
string base64String = System.Text.Encoding.Default.GetString(base64Bytes); 
byte[] imageBytes = Convert.FromBase64String(base64String); 
using (var ms = new MemoryStream(imageBytes)) 
{ 
    img = Image.FromStream(ms); 
}

来源

2014-01-08 15:13:30

我将如何提取文本的这一部分？ – user517406

编辑答案，获取字节而不是流。 –

嗨，我现在可以从流中加载图像，但图像不保存（请参阅上面的编辑） – user517406

无法将图片保存为图片

回答

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