如何将 IPictureDisp 转换为 System.Drawing.Image

Question

我从 COM 库（Microsoft Office Document Imaging 又名 MODI）收到一个 IPictureDisp 形式的图像，我想将其转换为 System.Drawing.Image 对象。

最好的方法是什么？

目前我正在使用下面的代码，但是它会抛出 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);

这是异常堆栈跟踪：

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)

我的项目中引用了 stdole、System.Windows.Forms 和 System.Drawing。我错过了什么吗？

Answer 1

看看这篇文章。

它描述了三种不同的选项，只需选择您认为最简单或“最干净”的选项（包括您声称不适合您的选项）。

Olivier Jacot-Decombes：上面的链接已损坏。我已经添加了来自互联网档案馆WayBackMachine 的相应链接：

在 IPictureDisp 和 System.Drawing.Image 之间进行转换（MSDN 博客 > Andrew Whitechapel）。