Load an image from a stream in C#

Image

To load an image from a Stream object, use the CreateGdPictureImageFromStream method from the GdPictureImaging class. The provided stream object must support seeking. The CreateGdPictureImageFromStream method creates a new GdPicture representation of an image and returns a unique non-zero image identifier — imageID — of the newly created GdPicture image. This method accepts the following parameters:

  • Stream — The image data stored in a stream object.
  • ImageFormat — Optional: Specifies the image format represented as a member of the DocumentFormat enumeration.
  • DirectAccess — Optional: When this parameter is set to true, then only the image properties, metadata, and embedded thumbnail are loaded. This parameter requires the ImageFormat.

Remember to release the image resource once you stop using it. Use the ReleaseGdPictureImage method.

To load an image from a byte array, use the following code:

using GdPictureImaging gdpictureImaging = new GdPictureImaging();
// Create a stream object from an image file.
using Stream streamImage = new FileStream(@"C:\temp\source.jpg", FileMode.Open);
// Create a GdPicture image from the stream object.
int imageID = gdpictureImaging.CreateGdPictureImageFromStream(streamImage);
gdpictureImaging.SaveAsPNG(imageID, @"C:\temp\output.png");
gdpictureImaging.ReleaseGdPictureImage(imageID);