GDI +，JPEG图像到MemoryStream中发生一般错误

#1 楼

// At this point the new bitmap has no MimeType
// Need to output to memory stream
using (var m = new MemoryStream())
{
       dst.Save(m, format);

       var img = Image.FromStream(m);

       //TEST
       img.Save("C:\test.jpg");
       var bytes = PhotoEditor.ConvertImageToByteArray(img);


       return img;
 }

#2 楼

#3 楼

  int width = 480;
  var height = UInt16.MaxValue - 36; //succeeds at 65499, 65500
  try
  {
    while(true)
    {
      var image = new Bitmap(width, height);
      using(MemoryStream ms = new MemoryStream())
      {
        //error will throw from here
        image.Save(ms, ImageFormat.Jpeg);
      }
      height += 1;
    }
  }
  catch(Exception ex)
  {
    //explodes at 65501 with "A generic error occurred in GDI+."
  }

#4 楼

using (var strm = new ... )  {
    myImage = Image.FromStream(strm);
}

Stream imageStream;
...

    imageStream = new ...;
    myImage = Image.FromStream(strm);

#5 楼

var img = System.Drawing.Image.FromStream(incomingStream);

// img.Save(path);
System.IO.File.WriteAllText(path, "Testing valid path & permissions.");

#6 楼

using (var ms = new MemoryStream())
{
    Bitmap bmp = new Bitmap(imageToConvert);
    bmp.Save(ms, format);
    return ms.ToArray();
}

#7 楼

#8 楼

  try
  {
    img.SaveJpeg(tmpFile, quality); // This is always successful for say image1.jpg, but always throws the GDI+ exception for image2.jpg
  }
  catch (Exception ex)
  {
    // Try HU's method: Convert it to a Bitmap first
    img = new Bitmap(img); 
    img.SaveJpeg(tmpFile, quality); // This is always successful
  }

private static void SaveJpeg(this Image img, string filename, int quality)
{
  EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, (long)quality);
  ImageCodecInfo jpegCodec = GetEncoderInfo("image/jpeg");
  EncoderParameters encoderParams = new EncoderParameters(1);
  encoderParams.Param[0] = qualityParam;
  img.Save(filename, jpegCodec, encoderParams);
}

private static ImageCodecInfo GetEncoderInfo(string mimeType)
{
    var encoders = ImageCodecInfo.GetImageEncoders();
    var encoder = encoders.SingleOrDefault(c => string.Equals(c.MimeType, mimeType, StringComparison.InvariantCultureIgnoreCase));
    if (encoder == null) throw new Exception($"Encoder not found for mime type {mimeType}");
    return encoder;
}

#9 楼

#10 楼

private Image GetImage(byte[] byteArray)
{
   using (var stream = new MemoryStream(byteArray))
   {
       return Image.FromStream(stream);
    }
}

private Image GetImage(byte[] byteArray)
{
   var stream = new MemoryStream(byteArray))
   return Image.FromStream(stream);        
}

#11 楼

using (var m = new MemoryStream())
{
    var img = new Bitmap(Image.FromStream(m));
    return img;
}

#12 楼

#13 楼

public Image Base64ToImage(string base64String)
    {
        // Convert Base64 String to byte[]
        byte[] imageBytes = Convert.FromBase64String(base64String);
        MemoryStream ms = new MemoryStream(imageBytes, 0,
          imageBytes.Length);

        // Convert byte[] to Image
        ms.Write(imageBytes, 0, imageBytes.Length);
        Image image = Image.FromStream(ms, true);
        return image;
    }

 img.Save("YOUR PATH TO SAVE IMAGE")

#14 楼

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#17 楼

using (System.Drawing.Image img = Bitmap.FromFile(fileName))
{
      ... do some manipulation of img ...
      img.Save(fileName, System.Drawing.Imaging.ImageFormat.Jpeg);
}

#18 楼

#19 楼

            default:
                format = ImageFormat.Jpeg;
                break;

            case "image/jpg": // or "image/jpeg" !
                format = ImageFormat.Jpeg;
                break;

#20 楼

#21 楼

new Bitmap(oldbitmap).Save(filename);

#22 楼

string imagePath = Path.Combine(Environment.CurrentDirectory, $"Bhatti{i}.png");
Bitmap bitmap = new Bitmap(image);
bitmap.Save(imagePath);

#23 楼

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#26 楼

byte[] bts = (byte[])page1.EnhMetaFileBits; 
using (var ms = new MemoryStream(bts)) 
{ 
    var image = System.Drawing.Image.FromStream(ms); 
    System.Drawing.Image img = image.GetThumbnailImage(200, 260, null, IntPtr.Zero);      
    img.Save(NewPath, System.Drawing.Imaging.ImageFormat.Png);
}

#27 楼

#28 楼

String path = Server.MapPath("~/last_img.png");//Path

#29 楼

#30 楼

image_instance = Image.FromFile(file_name);

image_instance.Load(file_name);