How can I know what image format I get from a stream?

Question

I get a byte stream from some web service. This byte stream contains the binary data of an image and I'm using the method in C# below to convert it to an Image instance.

I need to know what kind of image I've got. Is it a simple bitmap (*.bmp) or a JPEG image (*.jpg) or a png image?

How can I find it out?

    public static Image byteArrayToImage( byte[] bmpBytes )     {         Image image = null;         using( MemoryStream stream = new MemoryStream( bmpBytes ) )         {             image = Image.FromStream( stream );         }          return image;     } 

Answer 1

You may checkout the Image.RawFormat property. So once you load the image from the stream you could test:

if (ImageFormat.Jpeg.Equals(image.RawFormat)) {     // JPEG } else if (ImageFormat.Png.Equals(image.RawFormat)) {     // PNG } else if (ImageFormat.Gif.Equals(image.RawFormat)) {     // GIF } ... etc 

Answer 2

You can get the image type from the following code:

//get your image from bytaArrayToImage Image img = byteArrayToImage(new byte[] { });  //get the format/file type string ext = new ImageFormatConverter().ConvertToString(img.RawFormat);