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6-Apr-05 2:37

I am drawing a report using data from database.. I use the GDI+ drawing libraries, system.drawing.dll

The site works on the following computers:
- Microsoft windows 2000 pro Netherlands;
- Microsoft windows 2000 server english;

When i try to use it on a laptop with Windows XP pro SP2 english i get the following error:

"ArgumentExeption:INVALID PARAMETER USED"
I have found out that the error only occurs when the code draws a string. The drawing of rectangles and such work perfectly.

An example of the code on which it crashes is:

<br />
int BlockDateWidth = 2 * 60; <br />
Graphics tmpGraphics = Graphics.FromImage(new Bitmap(1,1)); <br />
.. <br />
.. <br />
objGraphics.DrawString("Startdate", new Font("Arial", 10), Brushes.Black, new PointF( <br />
((BlockDateWidth / 2) - tmpGraphics.MeasureString("Startdate", new Font("Arial", 10), 50).Width) / 2, waMaxHeight - 10)); <br />

i am trying to figure out why it works on 2000 server dutch and english and why it doesn't on that XP and 2003 server machine...

leppie6-Apr-05 2:51

leppie

6-Apr-05 2:51

Hehe, thats the same exception you get when ever GDI+ chokes. Best bet is to just click continue and see what was the last action/method called. In your case, I suspect something with the bitmap size. Why not make it slightly bigger. Or use Graphics.FromHwnd(IntPtr.Zero) (dont dispose!) that will give a 'graphics object to use'.

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Confuzler6-Apr-05 3:12

6-Apr-05 3:12

Invalid parameter used.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Invalid parameter used.

Source Error:

Line 270: objGraphics.DrawLine(new Pen(Brushes.Black, 1), BlockDateWidth, 0, BlockDateWidth, waMaxHeight + 10);
Line 271: //Date labels
Line 272: objGraphics.DrawString("Startdate", new Font("Arial", 10), Brushes.Black, new PointF(((BlockDateWidth / 2) - tmpGraphics.MeasureString("Startdate", new Font("Arial", 10), 50).Width) / 2, waMaxHeight - 10));
Line 273: objGraphics.DrawString("Enddate", new Font("Arial", 10), Brushes.Black, new PointF((BlockDateWidth / 2) + ((BlockDateWidth / 2) - tmpGraphics.MeasureString("Startdate", new Font("Arial", 10), 50).Width) / 2, waMaxHeight - 10));
Line 274: //Workareaname and dividing lines

Source File: c:\data\apmis\src\web\chart\milestoneplan.aspx.cs Line: 272

--------------

Thats the problem i get, i increased the height and width but didnt seem to work...
im trying to work on it..

Confuzler6-Apr-05 3:27

6-Apr-05 3:27

another thing i wonder about is why it does work if i fade out all DrawString commands and it crashes when i dont... the strings that are being drawn lie within the image borders.

Confuzler6-Apr-05 4:57

Add Image icon in textbox

6-Apr-05 4:57

It appears that the following setting prohibits / fails using the DrawString() command of the graphics object.

objGraphics.CompositingMode = SourceCopy;

it looks like the the SourceOver option works i dont know if it is the combination of settings that i have used:

<code>
objGraphics.SmoothingMode = SmoothingMode.Default;
objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
objGraphics.CompositingMode = CompositingMode.SourceOver;
objGraphics.CompositingQuality = CompositingQuality.GammaCorrected;
objGraphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
</code>

if i had used
<code>SourceCopy</code>
then i get the "INVALID PARAMETER USED" error.

anyway, it works now, if anyone has insight in the real reasons for this to happen, like why <code>Graphics.DrawString</code> can't be used together with
<code>Graphics.CompositingMode.SourceCopy</code>

im glad it works now :->

Adnan Siddiqi6-Apr-05 2:21

Adnan Siddiqi

6-Apr-05 2:21

How could it be done?thers is no default property for it.

Thanks

MyBlogs
http://weblogs.com.pk/kadnan

Re: Add Image icon in textbox

leppie6-Apr-05 2:45

leppie

6-Apr-05 2:45

Why not put it next to it?

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Delegate on a MarshalByRefObject

PEK6-Apr-05 1:17

PEK

6-Apr-05 1:17

I have created an service that communicate with clients via sockets. Now I need some kind of interface to the service so I could close all sockets, get information about the clients and so on.

My idea is to use an singleton object on the server which the (interface-) clients connects to. If a client want to close all sockets it calls a function on the object, and the object then calls a function in the server object which handles all sockets.

But I'm having problem with the communication between the singleton object and the server object. I'm trying to delegate a function on the server object to the client object.

This is the remote object:

public class RemoteObject : MarshalByRefObject 
{
	public delegate bool CloseSocketsDelegate();
	public CloseSocketsDelegate CloseSockets=null;		
}

And this is the server object:

public Server()
{
	ChannelServices.RegisterChannel( new TcpChannel(5050) );
	string url = "tcp://localhost:5050/RemoteObject";
		
	Type serverType = typeof(RemoteObject);
	RemotingConfiguration.RegisterWellKnownServiceType(
		typeof(RemoteObject), "RemoteObject", 
		WellKnownObjectMode.Singleton);

	RemoteObject rem = (RemoteObject)Activator.GetObject(serverType,url);
	
	/* Next line throws an security exception:
	 * 
	 * "System.Security.SecurityException: Type System.DelegateSerializationHolder
	 * and the types derived from it (such as System.DelegateSerializationHolder)  
	 * are not permitted to be deserialized at this security level."
	*/
	rem.CloseSockets = new RemoteObject.CloseSocketsDelegate( this.CloseSockets );
}

How do I solve the security exception? Is there some better way to solve the problem?

S. Senthil Kumar6-Apr-05 1:27

S. Senthil Kumar

6-Apr-05 1:27

Try doing this when registering the channel

IDictionary props = new Hashtable();
int portNumber = 9876;
props["port"] = portNumber;
props["typeFilterLevel"] =
   System.Runtime.Serialization.Formatters.TypeFilterLevel.Full;
try
{
   ChannelServices.RegisterChannel(new TcpChannel(props, clientProvider, serverProvider));
}

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

PEK6-Apr-05 5:03

PEK

6-Apr-05 5:03

Thank, that solved the problem. And it also seems to work as I wanted it too Smile | :)

. I changed the server code to this:

public Server()
{
	BinaryClientFormatterSinkProvider clientProvider = null;
	BinaryServerFormatterSinkProvider serverProvider = new BinaryServerFormatterSinkProvider();
	serverProvider.TypeFilterLevel = System.Runtime.Serialization.Formatters.TypeFilterLevel.Full;
	
	IDictionary props = new Hashtable(); 
	int portNumber = 5050;      
	props["port"] = portNumber;        
	props["typeFilterLevel"] = System.Runtime.Serialization.Formatters.TypeFilterLevel.Full;  
	try      
	{        
		ChannelServices.RegisterChannel
			(
			new TcpChannel(props, clientProvider, serverProvider)
			);         
	}
	finally
	{}

	string url = "tcp://localhost:5050/RemoteObject";
		
	Type serverType = typeof(RemoteObject);
	RemotingConfiguration.RegisterWellKnownServiceType(
		typeof(RemoteObject), "RemoteObject", 
		WellKnownObjectMode.Singleton);

	RemoteObject rem = (RemoteObject)Activator.GetObject(serverType,url);
	rem.CloseSockets = new RemoteObject.CloseSocketsDelegate( this.CloseSockets );
}

Tom Larsen6-Apr-05 4:45

Tom Larsen

6-Apr-05 4:45

I think you are running into a problem using .Net 1.0 remoting in a .Net 1.1 runtime environment. See http://www.thinktecture.com/Resources/RemotingFAQ/changes2003.html[^].

I must warn you right off the bat: delegates don't work well at all across application domains, especially ones that are "remote". There is a good reason why it will now throwing an exception. You can "revert" to old .Net 1.0 behavior but I wouldn't recommend it. Even if you do revert to old behavior it still isn't a good practice to use delegates across applictaion domains especially remoted ones.

Consider if you have three clients where the server triggers

CloseSockets.  The three clients might not even been in a state where they are ready to handle the delgate (ie. delegates are not interupts!).  Also consider that in many networks, the machine requesting/answering is not the machine making the request or answering.  Another machine is doing the NAT/proxy/other network manipulation.  Although it might work for "localhost" you can easily run into problem traversing even intranets.  Again three clients are connected to the server but the server only sees one IP for each of the client.  How does the server know which machine on the "other side" of the NAT/proxy/firewall to contact?<br />
<br />
In general, a client/server network design shouldn't rely on the client telling the server to close socks.  Strong server systems never rely on its client communication protocol for run state instructions.  Clients telling servers "tell me the answer to 3 + 4" is okay.  Clients telling servers to "cut network connections" is bad.  I emplore you to consider another way to do whatever it is you are attempting to do.