XslTransform object protection level problem - C# Discussion Boards

28-Oct-04 15:35

Always target the earliest possible typelib for Outlook. So, if you want to support Outlook 10 and 11, then interop the Outlook 10 typelib. For the most part (and for all Office products and properly written COM servers), COM servers are backward compatible (published interfaces should never changed, class IDs should never change but should implement new versions of interfaces, etc.).

You should not use your own, though. Office 2003 ships with the Office Primary Interop Assemblies (PIAs) (the ".NET Framework Programming Support" feature, or something like that) and you can download the PIAs for Office 2002 from http://www.microsoft.com/downloads/details.aspx?FamilyId=C41BD61E-3060-4F71-A6B4-01FEBA508E52&displaylang=en[^]. It's good to install and use the PIAs (once you install them correctly (read the README file) they will be referenced automatically instead of your own being created) since they are "official" RCWs (Runtime Callable Wrappers), typically from the company that created the COM server you're trying to interop with (and in these case they do come from Microsoft).

You must deploy these with your application, but should not - without a license - deploy the actual products (interop assemblies merely allow the Runtime to marshal calls to the COM servers that the interop assemblies/typelibs describe).

As far as the other exceptions, you must validate your code. The first is what happens when you don't check return values for null and the second is when you cast objects to types when the objects are that type or aren't derivatives of that type (or don't implement the interface if the interface was imported from a COM typelib).

It's not enough to just install the interop assemblies as I said above. The actual products must be installed on the machine. The interop assemblies (and typelibs, for that matter) do not contain the implementation, but merely describe it and assist clients with how to call the implementation it describes.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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IIS server

ppp00128-Oct-04 6:41

ppp001

28-Oct-04 6:41

hi all,

I want to create a application that include the function of a web server(including Https protocol), so can the code of my application invoke
the IIS component object on the PC ? (Assume that the PC don't have IIS installed and also I dont want to install IIS for the application)

Thanks

Re: IIS server

Alex Korchemniy28-Oct-04 9:59

Alex Korchemniy

28-Oct-04 9:59

There are a few things that you can do... Just out of interest, how are you going to be using this in your application?

This posting is provided "AS IS" with no warranties, and confers no rights.

Alex Korchemniy

Re: IIS server

Heath Stewart28-Oct-04 15:22

28-Oct-04 15:22

There is no "IIS component" to handle SSL. Either IIS handles the SSL handshaking and passes off the unencrypted data to ASP.NET, or you handle the SSL handshaking.

You can host ASP.NET yourself without IIS using the System.Web.Hosting.ApplicationHost class, but it doesn't handle SSL (IIS does that for ASP.NET).

If you use the Socket class and program your own HTTP daemon you will still need to handle SSL handshaking.

Bottom line, firewall your machine, keep up to date with patches, and just use IIS. ASP.NET isn't itself an HTTP daemon (unless you host it outside IIS, but even then it's not optimized for so many connections and performance); it "inherits" that functionality from IIS, which handles the requests and passes those requests off to ASP.NET for file types, etc., that ASP.NET handles.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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AVI to WMV

ee9903528-Oct-04 6:00

ee99035

28-Oct-04 6:00

Hi there!

I need to convert an AVi file to a Windows Media Video file and I want to convert it using C#. I don´t know where to start and I don´t know if it is possible.
Can you give me some tips?!!!

Thanks for your help, Sérgio

Re: AVI to WMV

Heath Stewart28-Oct-04 15:10

XslTransform object protection level problem

28-Oct-04 15:10

Download the Windows Media SDK from http://msdn.microsoft.com/library/en-us/dnanchor/html/audiovideo.asp[^], read it well, then create an interop assembly (using tlbimp.exe or VS.NET itself by adding a reference to your project from the COM tab) and follow the Visual Basic 6 documentation, which uses the very same automation interfaces and supporting types that gets thrown into the interop assembly (RCW; Runtime Callable Wrapper).

There should be some articles that may help you here on this site, so use the search box at the top of every page right below the logo to search for them.

This uses the automation interfaces to make use of the WMV/WMA codecs (encoders and decoders), as well as other codecs on the system (you'll need the codecs for the AVI file, since AVI is only a file format - not a file encoding - and can use any codec the author wants to use).

Beyonds this, any questions you have about converting formats should be addressed in a different forum. If you have questions specific to C# (calling methods, constructing objects, P/Invoking native APIs not exposed in the automation interfaces, etc.), this forum is the place to ask.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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kroakdammit28-Oct-04 5:48

kroakdammit

28-Oct-04 5:48

Hi,

I have been developing a test application in Windows Forms (C#) to integerate with a Web Service to return a formatted XML document and then apply an XSLT template to convert the XML into a useful format.

Within the Windows Form enviorment I have had no problems, however when ported over to a class file i keep getting a protection error with the XslTransform object. (code snippet of the method that applies the transform below):

<br />
<font color="Green"><br />
/// Converts an imported XML file into FFW XML format. Expects the file <br />
/// to load from and the file to save to (strings) as parameters.</font><br />
private void WriteFFWImportFile(string strFileToLoad, string strFileToSave)<br />
{<br />
<font color="Green">//create a transform object to load the xslt conversion template.</font><br />
XslTransform myXsl = new XslTransform();<br />
myXsl.Load(ConfigurationSettings.AppSettings["XsltImportTransform"]);<br />
<br />
<font color="Green">//add the file imported as a parameter of the xslt for linking purposes</font><br />
XsltArgumentList myArgs = new XsltArgumentList();<br />
myArgs.AddParam("ParsolImport","",strFileToLoad);<br />
			<br />
<font color="Green">//create streams to allow us to write the file</font><br />
Stream	  fs		= new FileStream(strFileToSave,FileMode.Create);<br />
XmlWriter writer	= new XmlTextWriter(fs,System.Text.Encoding.Unicode);<br />
			<br />
<font color="Green">//load the import file</font><br />
XmlDocument myXml = new XmlDocument();<br />
myXml.Load(strFileToLoad);<br />
myXsl.Transform(myXml,myArgs,writer,null);<br />
	<br />
<font color="Green">//dispose of in memory objects</font><br />
writer.Close();<br />
fs.Close();<br />
}

Basically the code that I ported into a Class is exactly the same apart from where I am calling ConfigurationSettings.AppSettings["XsltImportTransform"] in WinForms - I have exposed via a property of the Class.

When I attempt to build the solution I get:
"Integration.cs(122): 'System.Xml.Xsl.XslTransform.XslTransform(object)' is inaccessible due to its protection level". I don't understand why this is happening ... is it a bug Confused | :confused:

Paul Griffiths
.Net Developer

Re: XslTransform object protection level problem

Heath Stewart28-Oct-04 15:05

Re: XslTransform object protection level problem

28-Oct-04 15:05

There several things wrong with this line:

myXsl.Load(ConfigurationSettings.AppSettings["XsltImportTransform"]);

What if the .config file isn't present or that setting isn't found? Either do validation checking or catch the inevitable exception that will occur from the null return value. Validation is far less expensive than throwing exceptions, though you should do that anyway (the XML document that contains the XSLT might be invalid, so Load will throw an exception).

What is that property called? You said you encapsulated the preceeding line in a property? Depending on the namespaces you're importing for that source file and the name of the property, you may have a naming conflict. Showing us line 122 and surrounding lines of Integration.cs would be most helpful.

For example, if you're importing System.Xml.Xsl and your property type and name are both XslTransform then you'll have a name clash and the compiler will complain (how it complains depends on the circumstances). If this is the case, you should either fully-qualify your property type or use an alias like so:

using XSLT = System.Xml.Xsl.XslTransform;
// ...
public XSLT XslTransform
{
  get { return ConfigurationSettings.AppSettings["XsltImportTransform"]; }
}

Don't forget to dermine if that property returns null.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

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kroakdammit28-Oct-04 23:24

kroakdammit

28-Oct-04 23:24

Thanks for the reply.

With regards to the ConfigurationSettings line of code, this was purely for a test application that I had direct control over so I hadn't put any validation in the code at the time.

Within my Class file I defined two string properties that will give a path to an import and export XSLT file. When these properties are set I will check for a valid path etc ... I've just illustrated the null case below.

<br />
public string XslImportTransform<br />
{<br />
 get {  return m_XslImportTransform; }<br />
 set {  m_XslImportTransform = value;<br />
        RuleBroken("** Error: Invalid XSLT file.",m_XslExportTransform == null); }<br />
}<br />

When I tried to create an XslTransform object in a private method of the class, using the string property to Load() the XslTransform, I was encountering the protection level error (NB: It was not the Load() method that was causing the problem but the instantiation call XmlTransform myXsl = new Transform(); ). I couldn't understand why this was happening because I was creating the XslTransform as a local variable to the method (the name did not clash with any reserved words, public or private members).

<br />
public void WriteFFWImportFile(string strFileToLoad, string strFileToSave)<br />
{<br />
   try<br />
    {<br />
       //create a transform object to apply load the xslt conversion template<br />
       XslTransform myXsl = new XslTransform(this.m_XslImportTransform);<br />
       myXsl.Load(this.m_XslImportTransform);<br />
    <br />
       //add the file imported from a parameter of the xslt<br />
       XsltArgumentList myArgs = new XsltArgumentList();<br />
       myArgs.AddParam("ParsolImport","",strFileToLoad);<br />
	<br />
       //create streams to allow us to write the file<br />
       Stream  fs	        = new FileStream(strFileToSave,FileMode.Create);<br />
       XmlWriter writer	= new XmlTextWriter(fs,System.Text.Encoding.Unicode);<br />
			<br />
       //load the import file<br />
       XmlDocument myXml = new XmlDocument();<br />
       myXml.Load(strFileToLoad);<br />
       myXsl.Transform(myXml,myArgs,writer,null);<br />
	<br />
       //dispose of in memory objects<br />
       writer.Close();<br />
       fs.Close();<br />
   }<br />
  catch(Exception ex)<br />
   {<br />
       //Log exception with Microsoft.ApplicationBlocks.ExceptionManager<br />
       ExceptionManager.Publish(ex);<br />
   }<br />
}<br />

Is it simply a case that all XslTransform objects have to be exposed as public when used in a Class? If so why is that the case?

I have changed the class so I can set a transform object as a public property and everything works fine, although I only wanted to load the transform when a specific method is called.

Once again thanks for all your help. Smile | :)

Paul Griffiths
.NET Developer

Re: XslTransform object protection level problem

kroakdammit28-Oct-04 23:33

kroakdammit

28-Oct-04 23:33

Whoopsie bit of a school boy error. Eek! | :eek:

Realised that I accidently put the string property into the constructor of the XslTransform object!

Tiredness is my worst enemy! Sleepy | :zzz:

Again thanks for the input and apologies for wasting your time. D'Oh! | :doh:

Paul Griffiths
.NET Developer

Copy a piece of an Image

delemur28-Oct-04 5:20

delemur

28-Oct-04 5:20

Hi I have an Image class object.
How I can get a new Image - rectangular piece of first Image.
Is there a function like
Image piece = SourceImage.GetSubImage(int x1, int y1, int x2, int y2);
? Smile | :)

Thanks.

Re: Copy a piece of an Image

Christian Graus28-Oct-04 9:36

Christian Graus

28-Oct-04 9:36

DrawImage has overloaded methods that allow you to draw part of an image ( via a graphics object ) onto another image ( via a Graphics object ).

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Re: Copy a piece of an Image

Alex Korchemniy28-Oct-04 9:56

Alex Korchemniy

28-Oct-04 9:56

I was going to answer this question but you got to it first. Smile | :)

Alex Korchemniy

How to do this in C#?

momer28-Oct-04 5:02

momer

28-Oct-04 5:02

//VC++ :
wSizeReturned = MAKEWORD(*pDataBuffer, *(pDataBuffer+1));
what does the identical C# code look like?

Christian Graus28-Oct-04 9:39

Christian Graus

28-Oct-04 9:39

MAKEWORD is a macro, which probably expands to something like this: *pDataBuffer + (*pDataBuffer+1)>>4) and the code is the same in C#.

The >> operator shifts the bits of the number, so that in binary, 1 >> 4 becomes 10000

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

Mike Dimmick28-Oct-04 10:47

Mike Dimmick

28-Oct-04 10:47

Uh, you need to shift a byte by 8, and left-shifts multiply - right-shifts divide. The C++ definition is pretty complex, ensuring that the values to be shifted are actually bytes (by masking).

Rough equivalent:

public static ushort MakeWord(byte a, byte b)
{
  return (ushort)a | ((ushort)b << 8);
}

It doesn't make much difference whether you use + or |, but the original macro uses |, so I have too.

Stability. What an interesting concept. -- Chris Maunder

momer28-Oct-04 14:57

momer

28-Oct-04 14:57

Hi!Graus,

Thanks!I have got it.
By the way,
"I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's.",what
does this mean?;)

Best wishes!
momer

Christian Graus28-Oct-04 15:01

Christian Graus

28-Oct-04 15:01

I dunno - someone else said it, I just thought it was funny.

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

sreejith ss nair28-Oct-04 2:18

sreejith ss nair

28-Oct-04 2:18

In .NET it is very easy to create a custom event and eventhadlers.You can add any number of parameter on your custom event. What you need to do is, Declare your delegate in such a way.
Eg:

<br />
Delegate declaration.<br />
<br />
public delegate void CustomDel(string a);<br />
<br />
event declaration of the type CustomDel<br />
<br />
private event CustomDel CustomDelEvt;<br />
<br />
Adding event handler.<br />
<br />
CustomdelEvt+=new CustomDel(Button_Devevt);<br />
<br />
Handler definision<br />
<br />
private void Button_Devevt(string a)<br />
{<br />
 Messagebox.Show(a);<br />
}<br />

now you can call this event anywhere in your class file. This is how Custom event.

Sreejith Nair
[ My Articles ]

Stefan Troschuetz28-Oct-04 2:44

Stefan Troschuetz

28-Oct-04 2:44

iemand wrote:
btnMtnStandards = new LinkButton();

If this means you're using the System.Web.UI.WebControls.LinkButton class simply use the Command event in combination with the CommandName and/or CommandArgument property.
Take a look at the MSDN topic[^] for more information.

www.troschuetz.de

Nick Parker28-Oct-04 3:35

Nick Parker

28-Oct-04 3:35

You can still use your OpenMtnStandards event handler for multiple buttons, you can simply cast the sender object back to a LinkButton to find out which button it came from.

- Nick Parker
My Blog | My Articles

Member 147654828-Oct-04 3:51

Member 1476548

28-Oct-04 3:51

Thank Nick, but can You Show me some code how to cast the sender object back to a LinkButton??

Thnx

joost

Nick Parker28-Oct-04 5:01

Nick Parker

28-Oct-04 5:01

A LinkButton question really belongs in the ASP.NET forum, however the concept really just applies to .NET. Here is an example for a Windows application, but the underlying code should work the same assuming you change the class from a Button to a LinkButton. HTH

public class test : System.Windows.Forms.Form
{
	Button b, b2;
	public test()
	{
		InitializeComponents();		
	}
	public void InitializeComponents()
	{
		b = new Button();
		b2 = new Button();
		b.Text = "Some text";
		b2.Text = "Some other text";
		b2.Location = new Point(20, 20);
		b.Click += new EventHandler(bClick);
		b2.Click += new EventHandler(bClick);
		this.Controls.AddRange(new Control[] {b, b2});
	}	fs
	private void bClick(object sender, EventArgs e)
	{
		Button b = sender as Button;
		if(b != null)
		{
			//Do what you want here.
			MessageBox.Show(b.Text);
		}
	}		
	[STAThread]
	public static void Main()
	{
		Application.Run(new test());
	}	
}

- Nick Parker
My Blog | My Articles