get computer name

**homer.favenir** · December 16th, 2009, 01:51 AM

hi,
i want to get the computer name of incoming print to my printer in a network.

anyone knows how to do it?

thanks

**Krishnaa** · December 16th, 2009, 02:28 AM

You could use EnumJobs Win32 API to do this, you will get a JOB_INFO structure which has all the details of that job, like user, machine which created this job etc.

Here is a sample on MSDN.

**homer.favenir** · December 16th, 2009, 02:54 AM

thanks

btw i already made a printer disable/enable apps, all i need is to check the computername of any client who is trying to print in my printer. i checked your link and its VB.Net and not csharp.net.
my app is in csharp.net

tia

**Krishnaa** · December 16th, 2009, 03:29 AM

So, read the code and create C# equivalent, they just have few differences only, if you can't understand then post that piece of code and ask.

**homer.favenir** · December 16th, 2009, 04:23 AM

its too long, and i only want is the machine name of the client.

**Krishnaa** · December 16th, 2009, 07:06 AM

Then do it yourself, you need to Open Handle to the printer and then call EnumJobs on it, you will have to do a p/invoke thing.

If that's too hard then there is no way by which I can help.

**memeloo** · December 16th, 2009, 07:10 AM

maybe this will help you http://www.tech-archive.net/Archive/...4-04/4001.html
almost exacly what you need

**homer.favenir** · December 19th, 2009, 06:17 AM

Originally Posted by Krishnaa

You could use EnumJobs Win32 API to do this, you will get a JOB_INFO structure which has all the details of that job, like user, machine which created this job etc.

Here is a sample on MSDN.

hi,
i have an error in

Code:

 'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)
        Try
            If disposing AndAlso components IsNot Nothing Then
                components.Dispose()
            End If
        Finally
            MyBase.Dispose(disposing)
        End Try
    End Sub

the error is

Code:

Error	1	'Protected Overrides Sub Dispose(disposing As Boolean)' has multiple definitions with identical signatures.

tia

**BobS0327** · December 20th, 2009, 09:22 PM

Originally Posted by memeloo

maybe this will help you http://www.tech-archive.net/Archive/...4-04/4001.html
almost exacly what you need

Took the above sample and cleaned it up a little....

Code:

using System;
using System.Text;
using System.Runtime.InteropServices;
using System.ComponentModel;
namespace Sample
{
    class Program
    {
        [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = false,
		CallingConvention = CallingConvention.StdCall, SetLastError = true)]
        public static extern int OpenPrinter(string pPrinterName, out IntPtr phPrinter, IntPtr pDefault);

        [DllImport("winspool.Drv", EntryPoint = "GetPrinterA", SetLastError = true,
            CharSet = CharSet.Ansi, ExactSpelling = true,
            CallingConvention = CallingConvention.StdCall)]
        private static extern bool GetPrinter(IntPtr hPrinter, Int32 dwLevel,
        IntPtr pPrinter, Int32 dwBuf, out Int32 dwNeeded);

        [DllImport("winspool.drv", CharSet = CharSet.Auto)]
        public static extern int EnumJobs(IntPtr hPrinter, int FirstJob, int
        NoJobs, int Level, IntPtr pInfo, int cdBuf, out int pcbNeeded, out int
        pcReturned);

        [DllImport("winspool.drv", SetLastError = true)]
        static extern int ClosePrinter(IntPtr hPrinter);

        [StructLayout(LayoutKind.Sequential)]
        public struct SYSTEMTIME
        {
            public short wYear;
            public short wMonth;
            public short wDayOfWeek;
            public short wDay;
            public short wHour;
            public short wMinute;
            public short wSecond;
            public short wMilliseconds;
        }
        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct JOB_INFO_1
        {
            public int JobId;
            public string pPrinterName;
            public string pMachineName;
            public string pUserName;
            public string pDocument;
            public string pDatatype;
            public string pStatus;
            public int Status;
            public int Priority;
            public int Position;
            public int TotalPages;
            public int PagesPrinted;
            public SYSTEMTIME Submitted;
        }

        [StructLayout(LayoutKind.Sequential)]
        struct PRINTER_DEFAULTS
        {
            public IntPtr pDatatype;
            public IntPtr pDevMode;
            public int DesiredAccess;
        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct PRINTER_INFO_2
        {
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pServerName;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pPrinterName;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pShareName;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pPortName;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pDriverName;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pComment;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pLocation;
            public IntPtr pDevMode;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pSepFile;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pPrintProcessor;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pDatatype;
            [MarshalAs(UnmanagedType.LPTStr)]
            public string pParameters;
            public IntPtr pSecurityDescriptor;
            public uint Attributes;
            public uint Priority;
            public uint DefaultPriority;
            public uint StartTime;
            public uint UntilTime;
            public uint Status;
            public uint cJobs;
            public uint AveragePPM;
        }

        private const int PRINTER_ACCESS_ADMINISTER = 0x4;
        private const int PRINTER_ACCESS_USE = 0x8;
        private const int STANDARD_RIGHTS_REQUIRED = 0xF0000;
        private const int PRINTER_ALL_ACCESS =
            (STANDARD_RIGHTS_REQUIRED | PRINTER_ACCESS_ADMINISTER
            | PRINTER_ACCESS_USE);

        static void AccessPrinter(string printerName)
        {
            int result;
            IntPtr hPrinter;
            int nBytesNeeded;
            int pcbNeeded;
            int pcReturned;
            IntPtr ptrPrinterInfo;
            int nRet;
            int nJunk;

            PRINTER_DEFAULTS pd = new PRINTER_DEFAULTS();
            PRINTER_INFO_2 pinfo = new PRINTER_INFO_2();
            int rawsize = Marshal.SizeOf(pd);
            IntPtr pdPtr = Marshal.AllocHGlobal(rawsize);
            pd.DesiredAccess = PRINTER_ALL_ACCESS;
            Marshal.StructureToPtr(pd, pdPtr, true);
            result = OpenPrinter(printerName, out hPrinter, pdPtr);

            if (result == 0)
            {
                throw new Win32Exception(Marshal.GetLastWin32Error());
            }
            GetPrinter(hPrinter, 2, IntPtr.Zero, 0, out nBytesNeeded);
            if (nBytesNeeded <= 0)
            {
                throw new System.Exception("Unable to allocate memory");
            }
            else
            {
                ptrPrinterInfo = Marshal.AllocCoTaskMem(nBytesNeeded);

                ptrPrinterInfo = Marshal.AllocHGlobal(nBytesNeeded);
                nRet = Convert.ToInt32(GetPrinter(hPrinter, 2,
                    ptrPrinterInfo, nBytesNeeded, out nJunk));
                if (nRet == 0)
                {
                    throw new Win32Exception(Marshal.GetLastWin32Error());
                }
            }
            pinfo = (PRINTER_INFO_2)Marshal.PtrToStructure(ptrPrinterInfo,
                typeof(PRINTER_INFO_2));
            EnumJobs(hPrinter, 0, (int)pinfo.cJobs, 1, IntPtr.Zero, 0, out pcbNeeded, out pcReturned);
            IntPtr pData = Marshal.AllocHGlobal(pcbNeeded);
            EnumJobs(hPrinter, 0, (int)pinfo.cJobs, 1, pData, pcbNeeded, out pcbNeeded, out pcReturned);
            JOB_INFO_1[] jobs = new JOB_INFO_1[pcReturned];
            int pTemp = pData.ToInt32(); //start pointer 
            for (int i = 0; i < pcReturned; ++i)
            {
                jobs[i] = (JOB_INFO_1)Marshal.PtrToStructure(new
                    IntPtr(pTemp), typeof(JOB_INFO_1));
                Console.WriteLine(jobs[i].JobId.ToString() + Environment.NewLine);
                Console.WriteLine(jobs[i].pUserName + Environment.NewLine);
                      pTemp+= Marshal.SizeOf( typeof(JOB_INFO_1) ); 
            }
            Marshal.FreeHGlobal(pData);
            ClosePrinter(hPrinter);
            for (int j = 0; j < pcReturned; ++j)
            {
                Console.WriteLine(jobs[j].pMachineName);
                Console.WriteLine(jobs[j].pUserName);
            }
        }
        static void Main()
        {
		     AccessPrinter(@"\\myServer\myPrinter");
        }
    }
}

**homer.favenir** · December 21st, 2009, 04:52 AM

exactly what i needed.
thanks a lot!
one more thing how can i insert the machinename in a listbox?
i tried everything but it didnt work

tia

**BobS0327** · December 21st, 2009, 08:52 AM

one more thing how can i insert the machinename in a listbox?

Does the following work for you?

Code:

string test= "Testing";
myListBox.Items.Add( test );

**memeloo** · December 21st, 2009, 09:26 AM

Originally Posted by homer.favenir

one more thing how can i insert the machinename in a listbox?

banned by google? http://msdn.microsoft.com/en-us/libr...03(VS.71).aspx

Originally Posted by homer.favenir

i tried everything but it didnt work

if you had tried everything it would certainly work.

**homer.favenir** · December 21st, 2009, 09:18 PM

i know how to add items in a listbox
but from the code above that gets the machine name, i cant find how to put it in a variable and insert it in listbox.

i tried everything, do some trial and error, but i dont know how to do it correctly.

thanks

**BobS0327** · December 22nd, 2009, 02:43 PM

Originally Posted by homer.favenir

i know how to add items in a listbox
but from the code above that gets the machine name, i cant find how to put it in a variable and insert it in listbox.

i tried everything, do some trial and error, but i dont know how to do it correctly.

thanks

Code:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;

public class ListBoxItemAdd : System.Windows.Forms.Form
{
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.ListBox listBox1;

    [DllImport("winspool.drv", CharSet = CharSet.Unicode, ExactSpelling = false,
          CallingConvention = CallingConvention.StdCall, SetLastError = true)]
    public static extern int OpenPrinter(string pPrinterName, out IntPtr phPrinter, IntPtr pDefault);

    [DllImport("winspool.Drv", EntryPoint = "GetPrinterA", SetLastError = true,
        CharSet = CharSet.Ansi, ExactSpelling = true,
        CallingConvention = CallingConvention.StdCall)]
    private static extern bool GetPrinter(IntPtr hPrinter, Int32 dwLevel,
    IntPtr pPrinter, Int32 dwBuf, out Int32 dwNeeded);

    [DllImport("winspool.drv", CharSet = CharSet.Auto)]
    public static extern int EnumJobs(IntPtr hPrinter, int FirstJob, int
    NoJobs, int Level, IntPtr pInfo, int cdBuf, out int pcbNeeded, out int
    pcReturned);

    [DllImport("winspool.drv", SetLastError = true)]
    static extern int ClosePrinter(IntPtr hPrinter);

    [StructLayout(LayoutKind.Sequential)]
    public struct SYSTEMTIME
    {
        public short wYear;
        public short wMonth;
        public short wDayOfWeek;
        public short wDay;
        public short wHour;
        public short wMinute;
        public short wSecond;
        public short wMilliseconds;
    }
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct JOB_INFO_1
    {
        public int JobId;
        public string pPrinterName;
        public string pMachineName;
        public string pUserName;
        public string pDocument;
        public string pDatatype;
        public string pStatus;
        public int Status;
        public int Priority;
        public int Position;
        public int TotalPages;
        public int PagesPrinted;
        public SYSTEMTIME Submitted;
    }
    [StructLayout(LayoutKind.Sequential)]
    struct PRINTER_DEFAULTS
    {
        public IntPtr pDatatype;
        public IntPtr pDevMode;
        public int DesiredAccess;
    }
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    public struct PRINTER_INFO_2
    {
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pServerName;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pPrinterName;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pShareName;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pPortName;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pDriverName;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pComment;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pLocation;
        public IntPtr pDevMode;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pSepFile;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pPrintProcessor;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pDatatype;
        [MarshalAs(UnmanagedType.LPTStr)]
        public string pParameters;
        public IntPtr pSecurityDescriptor;
        public uint Attributes;
        public uint Priority;
        public uint DefaultPriority;
        public uint StartTime;
        public uint UntilTime;
        public uint Status;
        public uint cJobs;
        public uint AveragePPM;
    }

    private const int PRINTER_ACCESS_ADMINISTER = 0x4;
    private const int PRINTER_ACCESS_USE = 0x8;
    private const int STANDARD_RIGHTS_REQUIRED = 0xF0000;
    private const int PRINTER_ALL_ACCESS =
        (STANDARD_RIGHTS_REQUIRED | PRINTER_ACCESS_ADMINISTER
        | PRINTER_ACCESS_USE);

    static void AccessPrinter(string printerName, ref JOB_INFO_1[] jobout, ref int count)
    {
        int result;
        IntPtr hPrinter;
        int nBytesNeeded;
        int pcbNeeded;
        int pcReturned;
        IntPtr ptrPrinterInfo;
        int nRet;
        int nJunk;

        PRINTER_DEFAULTS pd = new PRINTER_DEFAULTS();
        PRINTER_INFO_2 pinfo = new PRINTER_INFO_2();
        int rawsize = Marshal.SizeOf(pd);
        IntPtr pdPtr = Marshal.AllocHGlobal(rawsize);
        pd.DesiredAccess = PRINTER_ALL_ACCESS;
        Marshal.StructureToPtr(pd, pdPtr, true);
        result = OpenPrinter(printerName, out hPrinter, pdPtr);

        if (result == 0)
        {
            throw new Win32Exception(Marshal.GetLastWin32Error());
        }
        GetPrinter(hPrinter, 2, IntPtr.Zero, 0, out nBytesNeeded);
        if (nBytesNeeded <= 0)
        {
            throw new System.Exception("Unable to allocate memory");
        }
        else
        {
            ptrPrinterInfo = Marshal.AllocCoTaskMem(nBytesNeeded);

            ptrPrinterInfo = Marshal.AllocHGlobal(nBytesNeeded);
            nRet = Convert.ToInt32(GetPrinter(hPrinter, 2,
                ptrPrinterInfo, nBytesNeeded, out nJunk));
            if (nRet == 0)
            {
                throw new Win32Exception(Marshal.GetLastWin32Error());
            }
        }
        pinfo = (PRINTER_INFO_2)Marshal.PtrToStructure(ptrPrinterInfo,
            typeof(PRINTER_INFO_2));
        EnumJobs(hPrinter, 0, (int)pinfo.cJobs, 1, IntPtr.Zero, 0, out pcbNeeded, out pcReturned);
        IntPtr pData = Marshal.AllocHGlobal(pcbNeeded);
        EnumJobs(hPrinter, 0, (int)pinfo.cJobs, 1, pData, pcbNeeded, out pcbNeeded, out pcReturned);
        JOB_INFO_1[] jobs = new JOB_INFO_1[pcReturned];
        int pTemp = pData.ToInt32(); //start pointer 
        for (int i = 0; i < pcReturned; ++i)
        {
            jobs[i] = (JOB_INFO_1)Marshal.PtrToStructure(new
                IntPtr(pTemp), typeof(JOB_INFO_1));
            Console.WriteLine(jobs[i].JobId.ToString() + Environment.NewLine);
            Console.WriteLine(jobs[i].pUserName + Environment.NewLine);
            pTemp += Marshal.SizeOf(typeof(JOB_INFO_1));
        }
        Marshal.FreeHGlobal(pData);
        ClosePrinter(hPrinter);
        jobout = jobs;
        count = pcReturned;
    }

    private System.ComponentModel.Container components = null;

    public ListBoxItemAdd()
    {
        InitializeComponent();

    }

    protected override void Dispose(bool disposing)
    {
        if (disposing)
        {
            if (components != null)
            {
                components.Dispose();
            }
        }
        base.Dispose(disposing);
    }

    private void InitializeComponent()
    {
        this.button1 = new System.Windows.Forms.Button();
        this.listBox1 = new System.Windows.Forms.ListBox();
        this.SuspendLayout();

        this.button1.Font = new System.Drawing.Font("Verdana", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
        this.button1.Location = new System.Drawing.Point(16, 16);
        this.button1.Name = "button1";
        this.button1.Size = new System.Drawing.Size(80, 32);
        this.button1.TabIndex = 0;
        this.button1.Text = "Add";
        this.button1.Click += new System.EventHandler(this.button1_Click);
        // 
        // listBox1
        // 
        this.listBox1.BackColor = System.Drawing.Color.Red;
        this.listBox1.ForeColor = System.Drawing.SystemColors.HighlightText;
        this.listBox1.Location = new System.Drawing.Point(8, 64);
        this.listBox1.Name = "listBox1";
        this.listBox1.Size = new System.Drawing.Size(272, 238);
        this.listBox1.TabIndex = 2;
        // 
        // ListBoxItemAdd
        // 
        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(328, 318);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                    this.listBox1,
                                    this.button1});
        this.Name = "ListBoxItemAdd";
        this.Text = "ListBoxItemAdd";
        this.ResumeLayout(false);

    }

    [STAThread]
    static void Main()
    {
        Application.Run(new ListBoxItemAdd());
    }

    private void button1_Click(object sender, System.EventArgs e)
    {
        JOB_INFO_1[] j = new JOB_INFO_1[1000];
        int i = 0;
        AccessPrinter(@"\\myServer\myPrinter", ref j, ref i);
        for (int x = 0; x < i; ++x)
        {
            listBox1.Items.Add(j[x].pMachineName);
        }
    }
}

**homer.favenir** · December 22nd, 2009, 08:53 PM

thanks for the reply... i really appreciate it...

but it has an error...

Code:

Error	1	Program 'C:\Documents and Settings\homer.favenir.AAIGLOBAL\Local Settings\Application Data\Temporary Projects\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.exe' has more than one entry point defined: 'ListBoxItemAdd.Main()'.  Compile with /main to specify the type that contains the entry point.	C:\Documents and Settings\homer.favenir.AAIGLOBAL\Local Settings\Application Data\Temporary Projects\WindowsFormsApplication1\Form1.cs	230	17	WindowsFormsApplication1

Code:

[B]Error	2	Program 'C:\Documents and Settings\homer.favenir.AAIGLOBAL\Local Settings\Application Data\Temporary Projects\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.exe' has more than one entry point defined: 'WindowsFormsApplication1.Program.Main()'.  Compile with /main to specify the type that contains the entry point.	C:\Documents and Settings\homer.favenir.AAIGLOBAL\Local Settings\Application Data\Temporary Projects\WindowsFormsApplication1\Program.cs	14	21	WindowsFormsApplication1

Thread: get computer name

Thread Tools

Display

get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Re: get computer name

Posting Permissions