Question

From a COM library (Microsoft Office Document Imaging aka MODI) I receive an image as an IPictureDisp which I would like to convert to a System.Drawing.Image object.

What would be the best way to do that?

Currently I’m using the code below, which however throws an NotImplementedException.

internal sealed class IPictureDispHost : AxHost {     /// <summary>     /// Default Constructor, required by the framework.     /// </summary>     private IPictureDispHost() : base(string.Empty) { }     /// <summary>     /// Convert the image to an ipicturedisp.     /// </summary>     /// <param name='image'>The image instance</param>     /// <returns>The picture dispatch object.</returns>     public new static object GetIPictureDispFromPicture(Image image)     {         return AxHost.GetIPictureDispFromPicture(image);     }     /// <summary>     /// Convert the dispatch interface into an image object.     /// </summary>     /// <param name='picture'>The picture interface</param>     /// <returns>An image instance.</returns>     public new static Image GetPictureFromIPicture(object picture)     {         return AxHost.GetPictureFromIPicture(picture);     } }  ...  // somewhere later the conversion gets called Image image = IPictureDispHost.GetPictureFromIPicture(picture); 

This is the exception stack trace:

System.NotImplementedException: The method or operation is not implemented.    at System.Windows.Forms.UnsafeNativeMethods.IPicture.GetHandle()    at System.Windows.Forms.AxHost.GetPictureFromIPicture(Object picture)    at DocumentViewer.IPictureDispHost.GetPictureFromIPicture(Object picture) 

I have references to stdole, System.Windows.Forms and System.Drawing in my project. Am I missing something?

Answer 1

As it seems the picture obtained from the Microsoft Office Document Imaging COM components is not a valid IPictureDisp object and there seems no way to convert it.