Re: C# SNMP Printer! HELPPP! - C# Discussion Boards

MichCl11-Oct-12 8:13

11-Oct-12 8:13

I need to disable my button because when the user presses it twice, I get an InvalidOperationException (backgroundWorker is busy and cannot run multiple tasks concurrently) in my form's code that is calling the form where I disable the button. In my btn_Program_Click method, I have

btn_Program.Enabled = false

, so it should be disabled, but the user can still click on it for some reason. Perhaps I'm misunderstanding what Enabled = false should be doing??

Thanks,
Mich

Re: Disabling button not working

Pete O'Hanlon11-Oct-12 8:21

Pete O'Hanlon

11-Oct-12 8:21

An easier fix would be just to unhook the click eventhandler before you create your event and just enable your click again in the threading complete handler.

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Re: Disabling button not working

MichCl15-Oct-12 2:24

MichCl

15-Oct-12 2:24

How is the click eventhandler disabled?

Re: Disabling button not working

Pete O'Hanlon15-Oct-12 2:26

Pete O'Hanlon

15-Oct-12 2:26

Suppose you add the event handler like this:

myButton.Click += MyButton_Click;

Well, to remove the reference, all you need do is

myButton.Click -= MyButton_Click;

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Re: Disabling button not working

Ravi Bhavnani11-Oct-12 8:47

Ravi Bhavnani

11-Oct-12 8:47

That should work. Are you sure you're not enabling it again -or- inadvertently trying to start another instrance of your background task?

/ravi

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C# SNMP Printer! HELPPP!

batuhan karaduman11-Oct-12 4:22

batuhan karaduman

11-Oct-12 4:22

Hi,

i need your help. i search "how to check toner level in printer using c# and SNMP protocol.

Please give me your ideas.

thanks a lot.

Re: C# SNMP Printer! HELPPP!

Eddy Vluggen11-Oct-12 4:44

Eddy Vluggen

11-Oct-12 4:44

Check the SNMP-documentation; not all printers will provide the functionality, and I doubt that there will be much copy/pastable solutions out there.

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Re: C# SNMP Printer! HELPPP!

Wes Aday11-Oct-12 4:46

Wes Aday

11-Oct-12 4:46

alexalexalex1907 wrote:
check toner level in printer

Read the documentation for the printer (whatever it is) and/or check with whomever the manufacturer is.

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Re: C# SNMP Printer! HELPPP!

jschell11-Oct-12 8:55

jschell

11-Oct-12 8:55

SNMP is a protocol just like http (just http) is.

Knowing SNMP however tells you absolutely nothing about solving your problem. Just as knowing nothing but http would not allow you to interact with a web site.

So you must learn more about the specific printer, and driver software and version.

Re: C# SNMP Printer! HELPPP!

batuhan karaduman11-Oct-12 20:31

batuhan karaduman

11-Oct-12 20:31

now i wont be able to code this with examples on the internet, right?

XML

String snmpAgent = "ipAddressOfPrinter";
String snmpCommunity = "public";
SimpleSnmp snmp = new SimpleSnmp(snmpAgent, snmpCommunity);
Dictionary<SnmpSharpNet.Oid, AsnType> result = snmp.Get(SnmpSharpNet.SnmpVersion.Ver1, new string[] { "OidOfPrinter" });
if (result == null)
{
    MessageBox.Show("Request Failed", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{

    foreach (KeyValuePair<SnmpSharpNet.Oid, AsnType> entry in result)
    {
        textBox1.Text = entry.Key.ToString() + " = " + SnmpConstants.GetTypeName(entry.Value.Type) + " (SysDesc.): " + entry.Value.ToString() + "->" + SnmpConstants.SMI_APPSTRING;

        textBox1.Text += "SysName: "+entry.Key;
    }
}

Here is the connection to the printer. I can get the name, software, oid of the printer but i cant check its status(if it is online, paper jam, offline, toner low, etc.) how can i get theese properties?

Thanks a lot

Re: C# SNMP Printer! HELPPP!

Marco Bertschi12-Oct-12 4:57

Marco Bertschi

12-Oct-12 4:57

Hi,

I am not sure if this will help you, but check it out:

http://checktoner.blogspot.ch/[^]

Storing and retrieving objects inside databse

Sabry190511-Oct-12 4:08

Sabry1905

11-Oct-12 4:08

Hi i want to store and retrieve objects of any kind to SQL server database, i did the following, inside the database table, i had created a field of type varbinary(MAX),
and in the code, i had made the following to store the object

object treatment = dataGridViewDrugList.Rows;
MemoryStream memStream = new MemoryStream();
StreamWriter sw = new StreamWriter(memStream);
sw.Write(treatment);
dataRow[0] = memStream.GetBuffer();

and it was successful,
now i am not able to retrieve the object back
any ideas?

modified 11-Oct-12 10:32am.

Re: Storing and retrieving objects inside databse

Eddy Vluggen11-Oct-12 4:43

Eddy Vluggen

11-Oct-12 4:43

Try to 'serialize' the object, as opposed to simply trying to wildly dump it's contents. There's an example using the XmlSerializer on MSDN; once it works, you replace the XmlSerializer with a BinaryFormatter and you're done.

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Re: Storing and retrieving objects inside databse

Sabry190511-Oct-12 7:06

Sabry1905

11-Oct-12 7:06

please send the link

Re: Storing and retrieving objects inside databse

Eddy Vluggen11-Oct-12 9:59

Eddy Vluggen

11-Oct-12 9:59

Here[^] it is. Serialization may take some getting-used-to, but it's more versatile than dumping memory.

I'd recommend building it in two separate steps; First, create a small console-app to serialize a random object. Once that works, you should be able to switch between Xml-serialization and binary with ease.

Second part would be to store that "information" in a database. That will work the same way for any information; if you get stuck once you're there, simply come back and we'll look at it again Smile | :)

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Re: Storing and retrieving objects inside databse

Sabry190514-Oct-12 2:54

Sabry1905

14-Oct-12 2:54

Thanks, i solved the issue,
my error was that i was trying to serialize an object of type DataGridViewRowCollection

which is not marked as a Serializable object, i made my custom class which marked as Serializable, i had stored all the data in the DataGridViewRowCollection in that class,

now everything is OK

thanks again,

3 tier architecture

tannu dwivedi11-Oct-12 1:51

tannu dwivedi

11-Oct-12 1:51

i want to create 3 tier architecture in asp.net and c# using stored procedure

tannu

Re: 3 tier architecture

Wes Aday11-Oct-12 2:25

Wes Aday

11-Oct-12 2:25

tannu dwivedi wrote:
i want to create

Okay so go ahead and do that. Did you maybe have some sort of a question that you wanted to ask?

modified 11-Oct-12 10:48am.

Re: 3 tier architecture

Eddy Vluggen11-Oct-12 4:47

Eddy Vluggen

11-Oct-12 4:47

..and you're looking for a tutorial? Did not find anything on Google? Perhaps you'd like to start with Tier 1[^] and work your way up from there?

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Re: 3 tier architecture

CptSupermrkt11-Oct-12 16:26

CptSupermrkt

11-Oct-12 16:26

I don't know what you're asking, if anything at all, but check out http://imar.spaanjaars.com/416/building-layered-web-applications-with-microsoft-aspnet-20-part-1 It's a multi-part series that details what the 3 tier architecture is, and exactly how to implement it, with a real world example, complete with code snippets. I based our intranet solely on that article series, and it's worked out well so far.

Injection

ALIJavany11-Oct-12 1:24

ALIJavany

11-Oct-12 1:24

Hi Developers
How We Can Stop SQL Injection With Delegate ?
Please Help ME Thanx

Re: Injection

J4amieC11-Oct-12 1:30

J4amieC

11-Oct-12 1:30

You can't that makes no sense whatsoever.

You stop SQL Injection attacks (mainly) by using named parameters.

Re: Injection

ALIJavany11-Oct-12 8:37

ALIJavany

11-Oct-12 8:37

Really Really Thank you For Helping ME .
Thank You Very Much BUT I Do That Before With Creating Delegate And I Think one Code Can Do Faster And This is Why i Sent That Question.

Re: Injection

Eddy Vluggen11-Oct-12 1:30

Eddy Vluggen

11-Oct-12 1:30

Use a parameterized query[^]; the word 'delegate' is out of place here.

Bastard Programmer from Hell Suspicious | :suss:

if you can't read my code, try converting it here[^]

Re: Injection

Abhinav S11-Oct-12 20:57

Abhinav S

11-Oct-12 20:57

Proper validations inside a parameterized stored procedures can help reduce SQL injection.

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