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I'm using the IE web browser control. Do printing by executing the print command. I need to be able to get and set the page settings like margins, orientation, and header/footers. How do I access this?
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You could try passing OLECMDEXECOPT_PROMPTUSER as the nCmdExecOpt parameter to IOleCommandTarget::Exec, or the cmdexecopt parameter to IWebBrowser2::ExecWB. As far as passing values to the *pvaIn in IWebBrowser2::ExecWB, see the documentation for the IDM_PRINT command. The pvaIn argument is discussed there.
Note, too, that while I'm using C++ conventions above, the same is true in C# when you define either the IOleCommandTarget or IWebBrowser2 interface (or reference them from the Microsoft.mshtml.dll assembly) and cast them from your WebBrowser control.
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Well I looked and the pvaIn doesn't look too promising:
****
VARIANT of type VT_BSTR, VT_I2, or VT_ARRAY.
If pvaIn is a VARIANT of type VT_BSTR, pvaIn specifies the path to a custom print template.
If pvaIn is a VARIANT of type VT_I2, pvaIn can be set with the flags PRINT_DONTBOTHERUSER(0x01) and PRINT_WAITFORCOMPLETION(0x02) defined in mshtmhst.h. If 0 is specified, then the default behavior (show print dialog and do not wait for completion) occurs unless otherwise defined by the nCmdExecOpt parameter.
If pvaIn is a VARIANT of type VT_ARRAY, pvaIn specifies a SAFEARRAY containing (in the following order) a header BSTR, a footer BSTR, the address of an IStream pointer for a Microsoft® Outlook® Express header document, an alternate URL BSTR used for MSHTML in Outlook Express, and a DWORD containing flags.
Can be set to NULL to use the Microsoft Internet Explorer default print template.
****
It doesn't look like you can access the page margins, etc. from here. I was hoping maybe there was another object that you could get to. Looking through the sutff it doesn't look too flexible to me. There is something with printing templates in there, but in my case i can't you printing templates I need the application to specify the settings at runtime. (The settings have to be serialized to a db.)
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Besides prompting the user (the first option I mentioned previously), there's not really an easy way to do this apparently. If nothing else, you could use a print template (perhaps extract it to a temporary location, like the user's TEMP directory, and pass the string). We do something similar in our application. Just use in-line styles to control the margins, header, and footer.
You could, however, temporarily modify the registry since these values are in the registry. You should be mindful to put the previous values back, however. See the registry key HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\PageSetup.
You could also try asking in the microsoft.public.inetexplorer.ie4.printing newsgroup. Scan the headers first as there might already be a solution.
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I guess you are right. I've been searching and print templates are about the only thing that I can do.
You mensioned inline styles. What code would I include in an HTML document to specify what margins to use...
Thanks for the registry tip - I also needed that one. LOL. Its like you read my mind.
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You can either link one or more stylesheets (in the case of print preview templates, this is often a hastle), or you can use an inline <style> element (in the <head>, or in style attributes that almost all elements share:
<html>
<head>
<title>My Page</title>
<style>
body { margin: .5in; font-family: verdana,sans serif; }
p { font-size: 10pt; }
</style>
</head>
<body>
<p>Regular sentance with the 10pt font size from above.</p>
<p style="font-size: 8pt;">Smaller example sentance with inline style.</p>
</body>
<html>See Cascading Style Sheets[^] in the MSDN Library for more details.
Of course, using the inline styles with elements won't make much sense besides your header and footer, but you can use the <style> element to control the body's margins.
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I already knew about how to do it that way. See - IE adds those margins relative to the page setup margins. I was wondering if you can tell it what margins to use - absolute not relative.
I'll just do the registry hack.  Thanks
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Hi,
I am new to C# and trying to create an extended Class Library that extends Hashtable.
I have created a new class like this:
'public class SerializeableHashtable: System.Collections.Hashtable'
In a method called Load i load a Hashtable object from file and try to set it to SerializeableHashtable like this:
public System.Collections.Hashtable LoadHashtableForSample()
{
System.Collections.Hashtable table = new System.Collections.Hashtable();
return table;
}
public void Load()
{
this = LoadHashtableForSample(); // fails because this is readonly
base = LoadHashtableForSample(); // fails because it is not the right context for base ?!?
}
Both of the things i try in Load fails. So the big question is: How can i assign the Hashtable object to SerializeableHashtable? (In C++ it works using the this pointer ...)
Thanks a lot in advance
Thomas
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Thomas Gondorf wrote:
Both of the things i try in Load fails. So the big question is: How can i assign the Hashtable object to SerializeableHashtable? (In C++ it works using the this pointer ...)
You can't. SerializableHashtable is a child of Hashtable. You cannot assign a parent object to a reference pointing to the child. Also you cannot (without shooting yourself in the foot) do this in C++.
Suppose you had a method (FooBar) in SerializableHashtable which doesn't exist in Hashtable. If you were allowed to assign a Hashtable object to a SerializableHashtable reference, what would happen if you called FooBar?
It is possible for you to assign a SerializableHashtable object to a Hashtable reference.
Jared
jparsons@jparsons.org
www.prism.gatech.edu/~gte477n
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But he can cast it to a SerializableHashtable.
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Yeah, of course, or any other class derived from Hashtable.
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So, i throw this idea away and store the Hashtable Object in a member of SerializeableHashtable. That will work ... Thanks a lot for your help
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I am creating an app, that needs numerous "drivers"
the "drivers" are simple components that will accept a string, parse it and change some data in the main app.
I want to be able to load all of the drivers from a directory at run-time. So I can just place a new one in the directory and run the app without re-compiling.
Could someone please point me in the right direction. I am assuming each would go into their own DLL and be based on either an interface or a base class. But I still can't see the big picture and how they would load at run-time, or how they would fit into the main app.
Thank you very much for any help.
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Interfaces or abstract classes are a start, but you really need a way to resolve the Type as well. This usually entails having a custom configuration section in your .config file that registers the Type associated with a particular operation, sort of how a Type to create for the <httpHandlers> section is associated with HTTP verbs and a path from which files that need to be handled are associated with the IHttpHandler or IHttpHandlerFactory.
To make it easier, you should include yourl libraries either in your application's private path (the app's directory or any directory specified in your .config file under the configuration/runtime/assemblyBinding/probing section inside the privatePath attribute. For a good example, see the ASP.NET Web Matrix (a Microsoft employee-driven, free ASP.NET designer) at http://www.asp.net/[^].
There are also several good articles available here on CP about that cover this (though many use a proprietary configuration file, while I find using the .config file that is common to all runtime applications better). You just need to do a search. 
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I can drag & drop a image to a PictureBox(PB) by getting the filename and loading it that way, but I can't seem to be able to drag a image from IE and then drop it to my PB, it looks as though the image goes/is in my temp folder and sometimes its 0 len.
What I really want to either be able to load it as above, or have and image and send it elsewhere first.
Do I have to resort to cut/paste the image that way?
Plus I've looked at a few books and googled for hours, I'm using net 1.1 and I thought I could only have the copy cursor show when I was trying to copy an image, but the code I've seen doesn't seem to make the 'no entry' cursor show at all, anyone else experenced this?
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This comes down to clipboard formats (clipboard formats are also used for drag-n-drop). Basically, a drag source application puts data in an IDataObject (the Shell interface, not .NET's poor wrapper) and uses one or more clipboard formats. The drop target must understand one (or more) of these formats in order to get the data out.
First, you need to determine which clipboard formats Internet Explorer is using when dragging data out of the WebBrowser control. You could use a tool like ClipSpy[^] to find out what formats it's using.
Then your app must understand one of those formats. For instance, if Internet Explorer is using the string identified by DataFormats.Bitmap (in .NET), then you can get the data and cast it to a Bitmap object, assigning that (or rather a clone (Bitmap.Clone) to be safe) to the PictureBox.Image property.
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This comes down to clipboard formats (clipboard formats are also used for drag-n-drop). Basically, a drag source application puts data in an IDataObject (the Shell interface, not .NET's poor wrapper) and uses one or more clipboard formats. The drop target must understand one (or more) of these formats in order to get the data out.
First, you need to determine which clipboard formats Internet Explorer is using when dragging data out of the WebBrowser control.
Thanks for your reply, I think I've got the jist of it. Don't suppose you have any code or any other articles to have a look at?
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Hi,
I've built a custom control derived from System.Windows.Forms.Label. This custom control is a part of MyControls project which is a part of a solution (this solution contains a simple windows forms application and the MyControls project).
WHat is the best way to use this custom control in the abovementioned windows forms application? THis is what I did: opened the toolbox, added the custom control into the toolbox, and then dragged it into the windows form. But this approach seems pointlessly complicated to me, and it doesn't work as I expected (my custom control disappeared from the designer after a while, but when the application is compiled it is there). Another thing is that even when the MyControls is recompiled, the changes will not show in my windows forms application 
What am I doing wrong? Am I doing something stupid? Is there any other way?
Thanks for any clues/suggestions.
rado
Radoslav Bielik
http://www.neomyz.com/poll [^] - Get your own web poll
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First, add a Project reference to your Windows Forms project by right-clicking on it, click Add Reference, then click the projects tab. Select the project containing MyControl. This makes sure that no matter which build (debug, release, or any number of custom configurations) you do, both assemblies are the right builds.
Next, forget the toolbox - type in the control into the source manually. If you use the same style/format as the other controls in the form (a field at the top, instantiated in the first secton of InitializeComponent, and the properties set under a specially formatted source comment like the others), you'll see it in the designer next time. If you use the toolbox, it might interpret the assembly location as being different from the one you added in the step above (might, might not).
The toolbox is really for third-party libraries that have one or many class libraries and want to integrated with VS.NET for developer ease and better product visibility/returns. For internal development - as you've seen - it's usually just a pain.
There's really no easier way to do it. Being able to drag a control from the solution or class views to a form would be great - like UserControls in ASP.NET - but I have seen that yet in the features list for VS.NET.
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I was about to ask the same question as this thread..
So are you saying that if you have access to the source and dll of a user control project, add it manually in the 'windows generated' section of code, and if you only have access to the user control as a dll (no source) add it via the toolbox?
If you add it via the toolbox it stays there for all projects, doesn't it?
Cheers,
Barry
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Source doesn't matter. You're just adding a control reference to your source files manually to begin with, where VS.NET's designer would do it for you if you dragged it from the toolbox. Nothing more than that. Doesn't matter if the Type is defined in the current project's assembly, another project's assembly, or a third-party (or BCL) assembly. Just think of it as programming without VS.NET - frankly, I find the designers to be annoying (except, in some cases, for initial design of complex forms).
Barry Lapthorn wrote:
If you add it via the toolbox it stays there for all projects, doesn't it?
Yes, but just to be thorough, you can actually write a designer for a custom control that creates a ToolBoxItem only for the project in which the control is used. This has no relevance to this topic, but just thought I'd throw that in there.
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Heath Stewart wrote:
You're just adding a control reference to your source files manually to begin with, where VS.NET's designer would do it for you if you dragged it from the toolbox
So once you've added it, does it render it on the control for you to then use the gui tools to size it and position it? I really should get on a c# course  I'll maybe have a try later.
Cheers,
Barry
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