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CreateObject alike for WIA

Posted on 2006-07-11
Medium Priority
Last Modified: 2008-10-01

This is a code-snippet from a VB.NET print module

Dim dialog As Object = CreateObject("WIA.CommonDialog")

I've tried this in C# as follows:
Type t = Type.GetTypeFromProgID("WIA.CommonDialog");
object dialog=Activator.CreateInstance(t);

But then I cannot access dialog.ShowPhotoPrintingWizard();

I've referenced the waauit.dll now and add using WIA at top.
But still I want to get the other way(without referencing WIA).

Question by:kGenius
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LVL 44

Expert Comment

ID: 17088141
Hi kGenius,

you could try
object dialog = CreateObject("WIA.CommonDialog");

share what you know, learn what you don't
LVL 44

Accepted Solution

bruintje earned 2000 total points
ID: 17088172
disregard my first comment, what you are trying to do is not completely possible in C# because it is not in line with the strong typing used in C#


adapted from the comment of _TAD_

using System.Runtime.InteropServices;

Type myObjType;
object myObjValue;

myObjType = Type.GetTypeFromProgID("WIA.CommonDialog");
myObjValue = Activator.CreateInstance(myObjType);

myObjType.InvokeMember("ShowPhotoPrintingWizard", BindingFlags.InvokeMethod,null,myObjValue,vector);
LVL 96

Expert Comment

by:Bob Learned
ID: 17090437
Is it possible to add a reference, and use early-binding, instead of the late-bound Activator call?


Author Comment

ID: 17106334
It is possible in my app. I've done it that way (add the reference)
But I was so curious how C# could handle this one.

Thanks bruintje for sharing...

Expert Comment

ID: 22612544
tmp is like this..: "c:/users/me/pictures/abc.jpg"...

What the compiler says is "argument can not be converted from string to "ref object"
If've refered to http://msdn.microsoft.com/en-us/library/ms630492(VS.85).aspx
where is said that also could used a path to afile....
WIA.CommonDialog myprintDialog = new WIA.CommonDialogClass();
String tmp = theBasisPfad + currentDateiname;
myprintDialog.ShowPhotoPrintingWizard( tmp );

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