Is there anyone who can help me?I post it before.

[viorel]

Greeting All!

Is some one who can help me?

The problem is when I use a func(_GetDNSServers) from a native dll which is
responsible in returning DNS servers address.

public class DNSQuery
{
[DllImport("GetDNSDLL.dll")]
public static extern IntPtr _GetDNSServers();
public void PerformSomeActions()
{
. . .
byte[]buffer=new byte[1000];
System.Runtime.InteropServices.Marshal.Copy(_GetDN SServers(), buffer,0,
1000);
. . .
string strt=System.Text.Encoding.ASCII.GetString(buffer,0 ,1000);
strt= strt.Split(';')[0];
this.DNSHost=System.Net.Dns.GetHostByAddress(strt) .AddressList[0];
IPEndPoint ipendp=new IPEndPoint(DNSHost, 53);
sock.Connect(ipendp);
// ????????????????An Error will happened!!!
sock = new
Socket(AddressFamily.InterNetwork,socketType.Strea m,ProtocolType.Tcp);
//?????????????????An Error has been!!!
. . .
}
}
Message of exception is
An unhandled exception of type 'System.ExecutionEngineException' occurred in
system.dll

When I do not use _GetDNSServers(),I use a known server address, connection
is done.

_GetDNSServers() returns char * (a pointer to an array of chars(1 byte
perchar)) which contains all DNS servers address from that domain

How to avoid the problem?

Thks!

[Eric Gunnerson [MS]]

dotnet.framework.interop is probably a better place to ask this. You'll want
to add in the C prototype of the function you're trying to call.

--
Eric Gunnerson

Visit the C# product team at http://www.csharp.net
Eric's blog is at http://blogs.gotdotnet.com/ericgu/

This posting is provided "AS IS" with no warranties, and confers no rights.
"viorel" <vm*********@hotmail.com> wrote in message
news:Og**************@TK2MSFTNGP10.phx.gbl...

Greeting All!

Is some one who can help me?

The problem is when I use a func(_GetDNSServers) from a native dll which is responsible in returning DNS servers address.

public class DNSQuery
{
[DllImport("GetDNSDLL.dll")]
public static extern IntPtr _GetDNSServers();
public void PerformSomeActions()
{
. . .
byte[]buffer=new byte[1000];
System.Runtime.InteropServices.Marshal.Copy(_GetDN SServers(), buffer,0, 1000);
. . .
string strt=System.Text.Encoding.ASCII.GetString(buffer,0 ,1000);
strt= strt.Split(';')[0];
this.DNSHost=System.Net.Dns.GetHostByAddress(strt) .AddressList[0];
IPEndPoint ipendp=new IPEndPoint(DNSHost, 53);
sock.Connect(ipendp);
// ????????????????An Error will happened!!!
sock = new
Socket(AddressFamily.InterNetwork,socketType.Strea m,ProtocolType.Tcp);
//?????????????????An Error has been!!!
. . .
}
}
Message of exception is
An unhandled exception of type 'System.ExecutionEngineException' occurred in system.dll

When I do not use _GetDNSServers(),I use a known server address, connection is done.

_GetDNSServers() returns char * (a pointer to an array of chars(1 byte
perchar)) which contains all DNS servers address from that domain

How to avoid the problem?

Thks!

[Eric Gunnerson [MS]]

dotnet.framework.interop is probably a better place to ask this. You'll want
to add in the C prototype of the function you're trying to call.

--
Eric Gunnerson

Visit the C# product team at http://www.csharp.net
Eric's blog is at http://blogs.gotdotnet.com/ericgu/

This posting is provided "AS IS" with no warranties, and confers no rights.
"viorel" <vm*********@hotmail.com> wrote in message
news:Og**************@TK2MSFTNGP10.phx.gbl...

Greeting All!

Is some one who can help me?

The problem is when I use a func(_GetDNSServers) from a native dll which is responsible in returning DNS servers address.

public class DNSQuery
{
[DllImport("GetDNSDLL.dll")]
public static extern IntPtr _GetDNSServers();
public void PerformSomeActions()
{
. . .
byte[]buffer=new byte[1000];
System.Runtime.InteropServices.Marshal.Copy(_GetDN SServers(), buffer,0, 1000);
. . .
string strt=System.Text.Encoding.ASCII.GetString(buffer,0 ,1000);
strt= strt.Split(';')[0];
this.DNSHost=System.Net.Dns.GetHostByAddress(strt) .AddressList[0];
IPEndPoint ipendp=new IPEndPoint(DNSHost, 53);
sock.Connect(ipendp);
// ????????????????An Error will happened!!!
sock = new
Socket(AddressFamily.InterNetwork,socketType.Strea m,ProtocolType.Tcp);
//?????????????????An Error has been!!!
. . .
}
}
Message of exception is
An unhandled exception of type 'System.ExecutionEngineException' occurred in system.dll

When I do not use _GetDNSServers(),I use a known server address, connection is done.

_GetDNSServers() returns char * (a pointer to an array of chars(1 byte
perchar)) which contains all DNS servers address from that domain

How to avoid the problem?

Thks!