如何处理混合模式项目中的打印？

Question

I have a mixed-mode project C#(WPF) -> C++/Cli -> unmanaged C++.

The graphics is dealt with in c++. Some things are drawn and then transferred to c# thru a c++/cli interface object. In c# this interface is put on a xaml form and shown.

Now I need to send this picture to a printpreview and then to a printer.

How can it possibly be done?

I thought about serializing, but couldn't find anything about serializing c++/cli interfaces.

Any ideas? Thanks!

EDIT Ok, so I have to explain further on.

In my c# project I have a c++/cli object, through which I can communicate to my graphics in c++, and this object has many methods, like f.ex:

object.DrawLine
object.DrawSmthElse
object.UpdateImage

etc. etc.

So, when in WPF I show a xaml form, the filling of this form is happening through this object, like I call all these methods to draw all the things I need.

Now the question is: I need to send to printer exactly this graphics part (which is done in c++). In what form should I do it? How can I pass this object to a DocumentViewer in c# for example?

I hope that would be enough to put the question off hold.

Answer 1

Try sending the raw bytes of the bitmap to/from managed code and unmanaged code.

On the managed side, you can create a bitmap object with a Stream . You can also save an existing bitmap out to a stream . You can use a MemoryStream to easily read and write bytes to/from managed and unmanaged code within your C++/CLI objects.

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If the image is already on the Managed side (i couldn't tell if it is or not), then you can use the PrintPreviewDialog and PrintDialog ( example )