Find shared printers??

[trint]

How can I add all the network printers to a combobox?
Thanks,
Trint

[Alex Passos]

Take a look at this link:

http://msdn.microsoft.com/library/de...sharecheck.asp

I am not sure if this is available in .NET but it can certainly be used via
P/Invoke.

"trint" <tr***********@ gmail.com> wrote in message
news:11******** **************@ g14g2000cwa.goo glegroups.com.. .

How can I add all the network printers to a combobox?
Thanks,
Trint

[Willy Denoyette [MVP]]

"trint" <tr***********@ gmail.com> wrote in message
news:11******** **************@ g14g2000cwa.goo glegroups.com.. .

How can I add all the network printers to a combobox?
Thanks,
Trint

This can easely be done when running in a domain where all printers are
registered in the AD, using System.Director yServices namespace classes.
It's much harder when running in a workgroup, you could use
System.Manageme nt classes and query each individual server in the network
for the shared printers. Of course this doesn't mean you can use these
printers as access privileges could prevent this.
If only thing you need is a list of printers visible from a specific
location, use System.Manageme nt and query the local visible printers.

here's a small sample to give you an idea...

using System;
using System.Manageme nt;

class App {
public static void Main() {

using(Managemen tClass printerClass = new ManagementClass ("win32_printer "))
{
ManagementObjec tCollection printers = printerClass.Ge tInstances();
foreach(Managem entObject printer in printers)
{
Console.WriteLi ne("{0}",printe r["Name"]);
if ((bool)printer["Shared"] == true)
Console.WriteLi ne("------> Shared as: {0}",printer["ShareName"]);
}
}
}
}
Willy.

[trint]

Willy,
Thanks...can I use this same code to get the computers on the local
network also?
Thanks,
Trint
Willy Denoyette [MVP] wrote:

"trint" <tr***********@ gmail.com> wrote in message
news:11******** **************@ g14g2000cwa.goo glegroups.com.. .

How can I add all the network printers to a combobox?
Thanks,
Trint

This can easely be done when running in a domain where all printers

are registered in the AD, using System.Director yServices namespace classes. It's much harder when running in a workgroup, you could use
System.Manageme nt classes and query each individual server in the network for the shared printers. Of course this doesn't mean you can use these printers as access privileges could prevent this.
If only thing you need is a list of printers visible from a specific
location, use System.Manageme nt and query the local visible printers.

here's a small sample to give you an idea...

using System;
using System.Manageme nt;

class App {
public static void Main() {

using(Managemen tClass printerClass = new ManagementClass ("win32_printer ")) {
ManagementObjec tCollection printers = printerClass.Ge tInstances();
foreach(Managem entObject printer in printers)
{
Console.WriteLi ne("{0}",printe r["Name"]);
if ((bool)printer["Shared"] == true)
Console.WriteLi ne("------> Shared as: {0}",printer["ShareName"]); }
}
}
}
Willy.

[Willy Denoyette [MVP]]

"trint" <tr***********@ gmail.com> wrote in message
news:11******** **************@ l41g2000cwc.goo glegroups.com.. .

Willy,
Thanks...can I use this same code to get the computers on the local
network also?
Thanks,
Trint

No, obtaining the computers in a network is only possible when there is a
central authority where they are registered like a Domain Controller or the
AD.
Another, less prefered method is to PInvoke NetServerEnum .... like this:

using System;
using System.Runtime. InteropServices ;
using System.Security ;
sealed class Tester
{
[DllImport("Neta pi32", CharSet=CharSet .Auto, SetLastError=tr ue),
SuppressUnmanag edCodeSecurityA ttribute]
static extern int NetServerEnum(
string ServerNane, // must be null
int dwLevel,
ref IntPtr pBuf,
int dwPrefMaxLen,
out int dwEntriesRead,
out int dwTotalEntries,
int dwServerType,
string domain, // null for login domain
out int dwResumeHandle
);
[DllImport("Neta pi32", SetLastError=tr ue),
SuppressUnmanag edCodeSecurityA ttribute]
static extern int NetApiBufferFre e(
IntPtr pBuf);

[StructLayout(La youtKind.Sequen tial)]
struct _SERVER_INFO_10 0
{
internal int sv100_platform_ id;
[MarshalAs(Unman agedType.LPWStr )]
internal string sv100_name;
}
static void Main()
{
const int MAX_PREFERRED_L ENGTH = -1;
int SV_TYPE_WORKSTA TION = 1;
int SV_TYPE_SERVER = 2;
IntPtr buffer = IntPtr.Zero;
IntPtr tmpBuffer = IntPtr.Zero;
int entriesRead = 0;
int totalEntries = 0;
int resHandle = 0;
int sizeofINFO = Marshal.SizeOf( typeof(_SERVER_ INFO_100));
try{
int ret = NetServerEnum(n ull, 100, ref buffer, MAX_PREFERRED_L ENGTH,
out entriesRead,
out totalEntries, SV_TYPE_WORKSTA TION|SV_TYPE_SE RVER, null, out
resHandle);
if (ret == 0)
{
for (int i = 0; i < totalEntries ; i++)
{
tmpBuffer = new IntPtr((int)buf fer + (i * sizeofINFO));
_SERVER_INFO_10 0 svrInfo = (_SERVER_INFO_1 00)
Marshal.PtrToSt ructure(tmpBuff er, typeof(_SERVER_ INFO_100));
Console.WriteLi ne(svrInfo.sv10 0_name);
}
}
}
finally
{
NetApiBufferFre e(buffer);
}
}
}

[trint]

Willy,
I tried using this code and it keeps erroring out with:
An unhandled exception of type 'System.Compone ntModel.Win32Ex ception'
occurred in system.windows. forms.dll
Thanks,
Trint
Willy Denoyette [MVP] wrote:

"trint" <tr***********@ gmail.com> wrote in message
news:11******** **************@ l41g2000cwc.goo glegroups.com.. .

Willy,
Thanks...can I use this same code to get the computers on the local
network also?
Thanks,
Trint

No, obtaining the computers in a network is only possible when there

is a central authority where they are registered like a Domain Controller or the AD.
Another, less prefered method is to PInvoke NetServerEnum .... like this:
using System;
using System.Runtime. InteropServices ;
using System.Security ;
sealed class Tester
{
[DllImport("Neta pi32", CharSet=CharSet .Auto, SetLastError=tr ue),
SuppressUnmanag edCodeSecurityA ttribute]
static extern int NetServerEnum(
string ServerNane, // must be null
int dwLevel,
ref IntPtr pBuf,
int dwPrefMaxLen,
out int dwEntriesRead,
out int dwTotalEntries,
int dwServerType,
string domain, // null for login domain
out int dwResumeHandle
);
[DllImport("Neta pi32", SetLastError=tr ue),
SuppressUnmanag edCodeSecurityA ttribute]
static extern int NetApiBufferFre e(
IntPtr pBuf);

[StructLayout(La youtKind.Sequen tial)]
struct _SERVER_INFO_10 0
{
internal int sv100_platform_ id;
[MarshalAs(Unman agedType.LPWStr )]
internal string sv100_name;
}
static void Main()
{
const int MAX_PREFERRED_L ENGTH = -1;
int SV_TYPE_WORKSTA TION = 1;
int SV_TYPE_SERVER = 2;
IntPtr buffer = IntPtr.Zero;
IntPtr tmpBuffer = IntPtr.Zero;
int entriesRead = 0;
int totalEntries = 0;
int resHandle = 0;
int sizeofINFO = Marshal.SizeOf( typeof(_SERVER_ INFO_100));
try{
int ret = NetServerEnum(n ull, 100, ref buffer, MAX_PREFERRED_L ENGTH, out entriesRead,
out totalEntries, SV_TYPE_WORKSTA TION|SV_TYPE_SE RVER, null, out resHandle);
if (ret == 0)
{
for (int i = 0; i < totalEntries ; i++)
{
tmpBuffer = new IntPtr((int)buf fer + (i * sizeofINFO));
_SERVER_INFO_10 0 svrInfo = (_SERVER_INFO_1 00)
Marshal.PtrToSt ructure(tmpBuff er, typeof(_SERVER_ INFO_100));
Console.WriteLi ne(svrInfo.sv10 0_name);
}
}
}
finally
{
NetApiBufferFre e(buffer);
}
}
}

[trint]

They are all registered under 'company.com'.. .by the way.

[Willy Denoyette [MVP]]

"trint" <tr***********@ gmail.com> wrote in message
news:11******** **************@ o13g2000cwo.goo glegroups.com.. .

Willy,
I tried using this code and it keeps erroring out with:
An unhandled exception of type 'System.Compone ntModel.Win32Ex ception'
occurred in system.windows. forms.dll
Thanks,
Trint
Willy Denoyette [MVP] wrote:

"trint" <tr***********@ gmail.com> wrote in message
news:11******** **************@ l41g2000cwc.goo glegroups.com.. .

> Willy,
> Thanks...can I use this same code to get the computers on the local
> network also?
> Thanks,
> Trint
>

No, obtaining the computers in a network is only possible when there

is a

central authority where they are registered like a Domain Controller

or the

AD.
Another, less prefered method is to PInvoke NetServerEnum .... like

this:

using System;
using System.Runtime. InteropServices ;
using System.Security ;
sealed class Tester
{
[DllImport("Neta pi32", CharSet=CharSet .Auto, SetLastError=tr ue),
SuppressUnmanag edCodeSecurityA ttribute]
static extern int NetServerEnum(
string ServerNane, // must be null
int dwLevel,
ref IntPtr pBuf,
int dwPrefMaxLen,
out int dwEntriesRead,
out int dwTotalEntries,
int dwServerType,
string domain, // null for login domain
out int dwResumeHandle
);
[DllImport("Neta pi32", SetLastError=tr ue),
SuppressUnmanag edCodeSecurityA ttribute]
static extern int NetApiBufferFre e(
IntPtr pBuf);

[StructLayout(La youtKind.Sequen tial)]
struct _SERVER_INFO_10 0
{
internal int sv100_platform_ id;
[MarshalAs(Unman agedType.LPWStr )]
internal string sv100_name;
}
static void Main()
{
const int MAX_PREFERRED_L ENGTH = -1;
int SV_TYPE_WORKSTA TION = 1;
int SV_TYPE_SERVER = 2;
IntPtr buffer = IntPtr.Zero;
IntPtr tmpBuffer = IntPtr.Zero;
int entriesRead = 0;
int totalEntries = 0;
int resHandle = 0;
int sizeofINFO = Marshal.SizeOf( typeof(_SERVER_ INFO_100));
try{
int ret = NetServerEnum(n ull, 100, ref buffer,

MAX_PREFERRED_L ENGTH,

out entriesRead,
out totalEntries, SV_TYPE_WORKSTA TION|SV_TYPE_SE RVER, null,

out

resHandle);
if (ret == 0)
{
for (int i = 0; i < totalEntries ; i++)
{
tmpBuffer = new IntPtr((int)buf fer + (i * sizeofINFO));
_SERVER_INFO_10 0 svrInfo = (_SERVER_INFO_1 00)
Marshal.PtrToSt ructure(tmpBuff er, typeof(_SERVER_ INFO_100));
Console.WriteLi ne(svrInfo.sv10 0_name);
}
}
}
finally
{
NetApiBufferFre e(buffer);
}
}
}

What code? I didn't use Windows Forms in the sample, and you get an
Exception in system.windows. forms.dll.

Willy.