System.ArgumentException：参数无效

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我有发送HTML5画布的数据，连接codeD为Base64 BMP图像（使用该算法页面devpro.it/$c$c/216.html ）到一个服务器端过程，将其转换成为System.Drawing.Image对象并执行一些操作就可以了。

I have a page that sends html5 canvas data, encoded as a base64 bmp image (using this algorithm devpro.it/code/216.html) to a serverside process that converts it into a System.Drawing.Image object and does some operations on it.

在我的本地环境中，这工作得很好，但在我的EC2实例我收到以下错误：

In my local environment, this works just fine, but on my ec2 instance I get the following error:

System.ArgumentException：参数无效。在  System.Drawing.Image.FromStream（流流，布尔  useEmbeddedColorManagement，布尔validateImageData）在  System.Drawing.Image.FromStream（流流，布尔  useEmbeddedColorManagement）

System.ArgumentException: Parameter is not valid. at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData) at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement)

我的code如下所示：

My code looks as follows:

System.Drawing.Image image = null; string b64string = "..."; byte[] sf = Convert.FromBase64String(b64string ); using (MemoryStream s = new MemoryStream(sf, 0, sf.Length)) { image = System.Drawing.Image.FromStream(s, false); } ...

下面是与我用来测试的样本b64string的文本文件：docs.google/leaf?id=0BzVLGmig1YZ3MTM0ODBiNjItNzk4Yi00MzI5LWI5ZWMtMzU1OThlNWEyMTU5&hl=en_US

Here's a text file with a sample b64string that I'm using to test: docs.google/leaf?id=0BzVLGmig1YZ3MTM0ODBiNjItNzk4Yi00MzI5LWI5ZWMtMzU1OThlNWEyMTU5&hl=en_US

我也试过以下，并有同样的结果：

I've also tried the following and had the same results:

System.Drawing.ImageConverter converter = new System.Drawing.ImageConverter(); image = converter.ConvertFrom(sf) as System.Drawing.Image;

任何有识之士将大大AP preciated！

Any insight would be greatly appreciated!

推荐答案

我还是不知道你的问题的真正原因，但我想它是用图像格式，相关图像类不承认。检查二进制数据一点点之后，我可能是能够形成图像。我希望这有助于。

I still don't know the real cause of your problem, but i guess it is related with a image format which Image class doesn't recognize. After inspecting the binary data a little bit, I could be able to form your image. I hope this helps.

Bitmap GetBitmap(byte[] buf) { Int16 width = BitConverter.ToInt16(buf, 18); Int16 height = BitConverter.ToInt16(buf, 22); Bitmap bitmap = new Bitmap(width, height); int imageSize = width * height * 4; int headerSize = BitConverter.ToInt16(buf, 10); System.Diagnostics.Debug.Assert(imageSize == buf.Length - headerSize); int offset = headerSize; for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { bitmap.SetPixel(x, height - y - 1, Color.FromArgb(buf[offset + 3], buf[offset], buf[offset + 1], buf[offset + 2])); offset += 4; } } return bitmap; } private void Form1_Load(object sender, EventArgs e) { using (FileStream f = File.OpenRead("base64.txt")) { byte[] buf = Convert.FromBase64String(new StreamReader(f).ReadToEnd()); Bitmap bmp = GetBitmap(buf); this.ClientSize = new Size(bmp.Width, bmp.Height); this.BackgroundImage = bmp; } }