C# Discussion Boards - CodeProject

Re: MAC ADDRESS

dan!sh 12-Jul-09 22:46

dan!sh

12-Jul-09 22:46

What is the error?

Re: MAC ADDRESS

sanforjackass12-Jul-09 22:48

sanforjackass

12-Jul-09 22:48

The type or namespace 'ManagementScope' could not be found...

Re: MAC ADDRESS

dan!sh 12-Jul-09 22:55

dan!sh

12-Jul-09 22:55

Add a reference to System.Management in your application.

Re: MAC ADDRESS

sanforjackass12-Jul-09 22:57

sanforjackass

12-Jul-09 22:57

How?

Re: MAC ADDRESS

dan!sh 12-Jul-09 23:00

dan!sh

12-Jul-09 23:00

Like this[^].

System.Management will be in the first tab itself.

Re: MAC ADDRESS

sanforjackass12-Jul-09 23:29

sanforjackass

12-Jul-09 23:29

There IS An Erorr

ManagementScope theScope = new ManagementScope("\\\\computerName\\root\\cimv2");

StringBuilder theQueryBuilder = new StringBuilder();
theQueryBuilder.Append("SELECT MACAddress FROM Win32_NetworkAdapter");
ObjectQuery theQuery = new ObjectQuery(theQueryBuilder.ToString());
ManagementObjectSearcher theSearcher = new ManagementObjectSearcher(theScope, theQuery);
ManagementObjectCollection theCollectionOfResults = theSearcher.Get();

foreach (ManagementObject theCurrentObject in theCollectionOfResults)
{
string macAdd = "MAC Address: " + theCurrentObject["MACAddress"].ToString();<-----------Erorr(Object Reference not set to an ...)
MessageBox.Show(macAdd);
}
What can I Do?

Re: MAC ADDRESS

J4amieC13-Jul-09 0:08

J4amieC

13-Jul-09 0:08

The key here is debugging. It is a skill you must learn if you want to learn programming.

First thing to do is set a breakpoint on any of the lines above the foreach(..). Then start the programming in debug mode, I use F5, but you can do it from the menu if you prefer.

Then when the code stops at your breakpoint, begin examining the object's in scope paying attention to see if any are null. Im guessing it could be that theCollectionOfResults is null based on the location of the error, but you should see for yourself.

When you know what is null, you can work backwards to see which specific line of code is not behaving as you expect. It may be that you dont have permissions to read the MACAddress of the specified computer, it may be that that computer is unable to give you a MACAddress (you used to need a network adapter to have a MACAddress - this might not be true now).

I hope that helps.

good day.

Re: MAC ADDRESS

Henry Minute13-Jul-09 0:10

Henry Minute

13-Jul-09 0:10

sanforjackass wrote:
What can I Do?

You really seem to be out of your depth with this problem, you are asking questions about the most basic of .NET programming operations (how to add a reference, for example) so I would suggest that what you can do is to get a beginners book on C# and .NET and work through it carefully. There are several free ones on the web some for those totally new to programming and some for those transferring from other languages. A forum like this is not the place to be spoon-fed, solutions.

To answer your most recent problem. The error is being caused because there is either no such thing as theCurrentObject["MACAddress"] i.e. no such member, or, more likely, the content of theCurrentObject["MACAddress"] is null. So test for null before trying to access it and act on the result of that test.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: MAC ADDRESS

sanforjackass13-Jul-09 0:39

sanforjackass

13-Jul-09 0:39

I Want My Own Mac Address How Can I Get It?

Re: MAC ADDRESS

Henry Minute13-Jul-09 0:45

Henry Minute

13-Jul-09 0:45

J4amieC has told you how to find out what is going wrong in your code.

Follow his advice.

If you are unable to resolve the problem by doing that, you might try Googling for getting mac address for computer. I did and got loads of hits. If you want to cut down on the number, refine the search, try getting mac address for computer c#.

Re: MAC ADDRESS

#realJSOP13-Jul-09 1:02

#realJSOP

13-Jul-09 1:02

sanforjackass wrote:
I Want My Own Mac Address How Can I Get It?

People aren't generally assigned their own MAC address, so I think your only recourse is to purchase a network card. Each one comes with a MAC address.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Re: MAC ADDRESS

#realJSOP13-Jul-09 2:15

#realJSOP

13-Jul-09 2:15

Dude, you're a complete retard, aren't you...

Re: MAC ADDRESS

#realJSOP13-Jul-09 1:04

#realJSOP

13-Jul-09 1:04

From the other stuff you posted, I'm surprised that you understand the concept of a namespace.

Re: MAC ADDRESS

#realJSOP13-Jul-09 0:28

#realJSOP

13-Jul-09 0:28

Which MAC address?

Re: MAC ADDRESS

sanforjackass13-Jul-09 0:43

sanforjackass

13-Jul-09 0:43

Network Adapter

Re: MAC ADDRESS

#realJSOP13-Jul-09 1:00

#realJSOP

13-Jul-09 1:00

Which network adapter?

Store updated data from datagridview to sqlserver2000

elci12-Jul-09 21:13

elci

12-Jul-09 21:13

Hi,

I have a doubt in datagridview. I'm retrieving data from sql to datagridview. Now my problem is that i have to edit the data and store the new data into the sql again.plz help......

Thanks in advance..

Re: Store updated data from datagridview to sqlserver2000

dan!sh 12-Jul-09 21:31

dan!sh

12-Jul-09 21:31

This[^] is how it can be done.

Re: Store updated data from datagridview to sqlserver2000

elci12-Jul-09 22:47

elci

12-Jul-09 22:47

Thanks, but this code is not working i have already implemented this code. can u send me another code for saving the updated values into the database.

Thanks in advance........

read video stream from IP Address on 80 port assigned to DVR

kunal.tawde12-Jul-09 20:37

kunal.tawde

12-Jul-09 20:37

Hi,

I have 4 different cameras located in my home.
These 4 cameras are connected to 4 channel DVR.
DVR store recorded video stream data in raw format on one attached hard disk drive.
I assign static IP address to this DVR, and DVR throws video streams on this IP address and 80 port.

Are there any ways to read video streams from this IP address and 80 port of DVR.

Regards,
Kunal.

Re: read video stream from IP Address on 80 port assigned to DVR

#realJSOP13-Jul-09 1:05

#realJSOP

13-Jul-09 1:05

My guess would be "yes".

Re: read video stream from IP Address on 80 port assigned to DVR

kunal.tawde13-Jul-09 21:14

kunal.tawde

13-Jul-09 21:14

Request you to please give me some method description of how i can do this in C# or C++/MFC.

c#:how to install new font?

lhong100112-Jul-09 19:00

lhong1001

12-Jul-09 19:00

first:i use two functions to install a new font int the following.

AddFontResource("d:\\tmp\\Ni7seg.ttf"); //FilePath为字体
SendMessage((IntPtr)0xFFFF, WindowsMessages.WM_FONTCHANGE, IntPtr.Zero, IntPtr.Zero);

second:i don't konw how to use the new font.how to set the label's text with the new font?who can give me a example?very thanks

Re: c#:how to install new font?

dan!sh 12-Jul-09 21:44

dan!sh

12-Jul-09 21:44

A label has a font property. You can use that to set the font for the Label text.

Re: c#:how to install new font?

lhong100112-Jul-09 22:15

lhong1001

12-Jul-09 22:15

i know that.i mean i have a font file(.ttf),my program first load this font to memcry.
but i don't know how to let the label to display text with the font.
i know one waw can get it.for exam:

System.Drawing.Text.PrivateFontCollection pfc = new System.Drawing.Text.PrivateFontCollection();
pfc.AddFontFile("d:\\tmp\\Ni7seg.ttf");
Font myFont = new Font(pfc.Families[0], 80f, FontStyle.Regular, GraphicsUnit.Point, 0);

but my program is running in wince that don't support "System.Drawing.Text.PrivateFontCollection".
so who know how to implement this through winapi.

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