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Problem Accessing IPHLPAPI.DLL from C#

Posted on 2003-03-04
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Last Modified: 2012-06-27
I would appreciate any help in calling GetNetworkParams in IPHLPAPI.DLL using C#.

I am new to C# and windows programing, I come from a Java background and I am unfamiliar with DLL's and stucts.

When I run the code attached below I only get a result code of 87.

The ouput of running the code is:

BufferSize => 100000000
Error => 87

My Test Code:

using System;
using System.Runtime.InteropServices;

namespace test
{
     public class IpHelperTest
     {
          public const int ERROR_BUFFER_OVERFLOW = 111;

          [DllImport("IPHLPAPI.DLL")]
          public static extern long GetNetworkParams(ref FIXED_INFO buf, long cbRequired);

          [StructLayout(LayoutKind.Sequential)]
          public struct IP_ADDR_STRING
          {
               long dwNext;  
               String IpAddress;  
               String IpMask;
               long dwContext;
          }

          [StructLayout(LayoutKind.Sequential)]
          public struct FIXED_INFO
          {
               String HostName;
               String DomainName;  
               IP_ADDR_STRING CurrentDnsServer;
               IP_ADDR_STRING DnsServerList;  
               long NodeType;  
               String ScopeId;
               long EnableRouting;  
               long EnableProxy;  
               long EnableDns;
          }
         
          public static void Main()
          {
               long bufferSize = 100000000;
         
               FIXED_INFO Info = new FIXED_INFO();
               long error = GetNetworkParams(ref Info, bufferSize);

               Console.WriteLine("BufferSize => "+bufferSize);
               Console.WriteLine("Error => "+error);
          }

     }
}
0
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Question by:JimBean
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3 Comments
 
LVL 3

Accepted Solution

by:
WiB earned 300 total points
ID: 8074364
87 = ERROR_INVALID_PARAMETER
  For the beginning you should fill out your Info structure with valid data.
 
For further debugging you can see System Error Codes here:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/debug/base/system_error_codes.asp
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