DhcpGetClientInfo and Error 1783 in Vista

[VladZ]

Hello,

Sample Code below always returns error code 1783 in Vista (SP1) but works
fine in Windows XP (SP3). Is it bug or my mistake?

I'm use:

1) Windows Software Development Kit (SDK) for Windows Server 2008 and .NET
Framework 3.5
2) VS2005 (SP1)

-------------------------------------

Code Snippet....
#include <windows.h>
#include <dhcpsapi.h>

#pragma comment(lib, "Dhcpsapi.lib")

....

DWORD GetClientInfoByMAC(LPCTSTR pszDhcpServerIP, BYTE* pMac, DWORD
nMacLength, DHCP_CLIENT_INFO** ppInfo)
{
DHCP_SEARCH_INFO query;
query.SearchType = DhcpClientHardwareAddress;
query.SearchInfo.ClientHardwareAddress.DataLength = nMacLength;
query.SearchInfo.ClientHardwareAddress.Data = pMac;
return DhcpGetClientInfo(pszDhcpServerIP, &query, ppInfo);
}

....

BYTE Mac[11] = {0};
//Subnet address in host order. (192.168.1.0)
Mac[0] = 0;
Mac[1] = 1;
Mac[2] = 168;
Mac[3] = 192;
//Hardware address type, this is the default value.
Mac[4] = 0x01;
//My MAC bytes start from here (00:15:60:b0:2d:da)
Mac[5] = 0x00;
Mac[6] = 0x15;
Mac[7] = 0x60;
Mac[8] = 0xb0;
Mac[9] = 0x2d;
Mac[10] =0xda;

DHCP_CLIENT_INFO* pCI_MAC = {0};
DWORD nError = GetClientInfoByMAC(_T("192.168.1.10"), Mac, sizeof(Mac),
&pCI_MAC);
if(nError == ERROR_SUCCESS)
{
//IT WORKS!!!
...
}
else
{
//ERROR!!!
...
}

 

[Jack \(MVP-Networking\).]

Hi
Maybe this can Help, http://support.microsoft.com/kb/928233
Jack (MS, MVP-Networking)

 

[VladZ]

My Vista gets IP from DHCP very well. And "The DhcpGetClientInfo function
returns information about a specific DHCP client..." (see DHCP API).
Code sample from my first post for search information about client (not
about my computer!) using its MAC address.

 

[DavidHomer]

Hi,

Yes I've been having this problem too, try using the following change to the DHCP_SEARCH_INFO struct.

It's not complete (i.e. I've dropped the other union members) but this will return the results correctly on 64bit platforms however then doesn't work on 32bit platforms.

Perhaps the ClientIpAddress property is actually a pointer (hence why it changes with the platform?)

I'll see if I can solve this properly...


///<summary>
/// The DHCP_SEARCH_INFO structure defines the DHCP client record data used to search against for particular server operations.
///</summary>
///<remarks>http://msdn.microsoft.com/en-us/library/windows/desktop/aa363370(v=vs.85).aspx</remarks>
[StructLayout(LayoutKind.Sequential)]
private struct DHCP_SEARCH_INFO
{


///<summary>
/// Search type (IP, MAC, or Hostname)
///</summary>
public DHCP_SEARCH_INFO_TYPE SearchType;


///<summary>
/// The IP address
///</summary>
public ulong ClientIpAddress;

}




Thanks,


Dave
http://www.centrel-solutions.com/xiaconfiguration