C# .NET Exif信息在生产服务器上不起作用
我正在读取JPEG的Exif信息以旋转图像。JPEG上传到ASP.NET,我读取上传流,旋转并保存。它在我的开发机器(Windows 10、IIS 10)上运行得很好,但当我在服务器(Windows server 2012 R2、IIS 8.5)上尝试时,它不工作,也不加载任何Exif信息 代码如下:C# .NET Exif信息在生产服务器上不起作用,c#,asp.net,image-processing,exif,C#,Asp.net,Image Processing,Exif,我正在读取JPEG的Exif信息以旋转图像。JPEG上传到ASP.NET,我读取上传流,旋转并保存。它在我的开发机器(Windows 10、IIS 10)上运行得很好,但当我在服务器(Windows server 2012 R2、IIS 8.5)上尝试时,它不工作,也不加载任何Exif信息 代码如下: void SavePhoto() { // PHOTO is the Html HttpPostedFile photo = Request.Files["ProfilePhoto
void SavePhoto()
{
// PHOTO is the Html
HttpPostedFile photo = Request.Files["ProfilePhoto_File"];
using (var image = Image.FromStream(photo.InputStream, true, true))
{
SaveConvertingFormat(image, "output_path.jpg");
}
}
public static void SaveConvertingFormat(Image image, string outputPath)
{
int imageWidth = image.Width;
int imageHeight = image.Height;
using (var result = new Bitmap(imageWidth, imageHeight))
{
using (var g = Graphics.FromImage(result))
{
g.DrawImage(image, 0, 0, imageWidth, imageHeight);
}
var rotation = GetExifRotate(image, outputPath);
// IN THE SERVER, rotation IS ALWAYS RotateNoneFlipNone
if (rotation != RotateFlipType.RotateNoneFlipNone)
result.RotateFlip(rotation);
SaveJpeg(result, outputPath, 85);
}
}
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);
}
public static RotateFlipType GetExifRotate(Image img, string outputPath)
{
// Source: https://stackoverflow.com/a/48347653/72350
// ERROR:
// IN THE PRODUCTION SERVER, PropertyIdList IS EMPTY!
const int ExifOrientationId = 0x112;
if (!img.PropertyIdList.Contains(ExifOrientationId))
return RotateFlipType.RotateNoneFlipNone;
var prop = img.GetPropertyItem(ExifOrientationId);
int val = BitConverter.ToUInt16(prop.Value, 0);
var rot = RotateFlipType.RotateNoneFlipNone;
if (val == 3 || val == 4)
rot = RotateFlipType.Rotate180FlipNone;
else if (val == 5 || val == 6)
rot = RotateFlipType.Rotate90FlipNone;
else if (val == 7 || val == 8)
rot = RotateFlipType.Rotate270FlipNone;
if (val == 2 || val == 4 || val == 5 || val == 7)
rot |= RotateFlipType.RotateNoneFlipX;
return rot;
}
同样,上面的代码:
- 有效:Windows 10、IIS 10
- 不工作:Windows Server 2012 R2,IIS 8.5
有什么建议吗?以防有人有同样的问题。我在使用WFP和GDI阅读产品介绍时遇到问题 使用WPF时,错误为:
System.Runtime.InteropServices.COMException (0x88982F8A): The component registration is invalid.
(Exception from HRESULT: 0x88982F8A)
at System.Windows.Media.Imaging.BitmapMetadata.GetQuery(String query)
解决方案:
唯一有效的方法是使用:
代码相当简单:
var img = new MagickImage(inputStream);
img.AutoOrient(); // Fix orientation
img.Strip(); // remove all EXIF information
img.Write(outputPath);
它还帮助我删除了10行。没有必要删除EXIF数据。AutoOrient()自动将EXIF方向设置为左上角 您还需要使用using子句,因为MagickImage实现了IDisposable
using (var img = new MagickImage(inputStream))
{
img.AutoOrient(); // Fix orientation
img.Write(outputPath);
}
这和公认的答案是一样的。无论如何,谢谢你。