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ctacke
877 Posts |
 Posted - 01 Apr 2003 : 10:57:32
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Q: I can release or renew my device's IP address by using ipconfig /release from the command line. How do I programmatically do the same thing?
The following code will do what you're after. You will also need to write a function called OutputMessage or tweak the code.
#include "iphlpapi.h"
void RenewAddress(DWORD AdapterIndex)
{
ULONG sizeofbuffer=0;
PIP_INTERFACE_INFO pbuffer=NULL;
int returnvalue;
BOOL bfound =FALSE;
returnvalue= GetInterfaceInfo(pbuffer, &sizeofbuffer);
if (returnvalue==ERROR_INSUFFICIENT_BUFFER)
{
pbuffer=(PIP_INTERFACE_INFO) malloc(sizeofbuffer);
if (pbuffer != NULL)
{
returnvalue=GetInterfaceInfo(pbuffer, &sizeofbuffer);
}
}
if (returnvalue!=NO_ERROR)
{
// error
exit(1);
}
for (int index=0;indexNumAdapters; index++)
{
if ((pbuffer->Adapter[index].Index==AdapterIndex)||(AdapterIndex==0))
{
bfound =TRUE;
int returnvalue=IpRenewAddress(&(pbuffer->Adapter[index]));
if (returnvalue==NO_ERROR)
OutputMessage(TEXT("Successfully Renewed Adapter with Index Number %lu\n"),
pbuffer->Adapter[index].Index);
else {
OutputMessage(TEXT("Failed to renew Adpter with Index Number %lu\n"),
pbuffer->Adapter[index].Index);
}
}
}
if (!bfound)
OutputMessage(TEXT("Adapter with given Index Number not found\n"));
if (pbuffer)
free(pbuffer);
}
void ReleaseAddress( DWORD AdapterIndex)
{
BOOL bfound =FALSE;
ULONG sizeofbuffer=0;
PIP_INTERFACE_INFO prelease=NULL;
int returnvalue;
returnvalue= GetInterfaceInfo(prelease, &sizeofbuffer);
if (returnvalue==ERROR_INSUFFICIENT_BUFFER)
{
prelease=(PIP_INTERFACE_INFO) malloc(sizeofbuffer);
if (prelease != NULL) {
returnvalue=GetInterfaceInfo(prelease, &sizeofbuffer);
}
}
if (returnvalue!=NO_ERROR) {
// error
exit(1);
}
for (int index=0;indexNumAdapters; index++) {
if ((AdapterIndex==0) || (prelease->Adapter[index].Index==AdapterIndex)) {
bfound=TRUE;
DWORD returnvalue=IpReleaseAddress(&(prelease->Adapter[index]));
if (returnvalue==NO_ERROR)
OutputMessage(TEXT("Successfully Released adapter with index Number %lu\n"),
prelease->Adapter[index].Index);
else {
OutputMessage(TEXT("Failed to release Adapter with index Number %lu\n"),
prelease->Adapter[index].Index);
}
}
}
if (!bfound)
OutputMessage(TEXT("Adapter with the given index Number not found\n"));
if (prelease)
free(prelease);
}
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ctacke
877 Posts |
Posted - 07 Apr 2003 : 15:03:00
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| This code also requires that you link to IPHLPAPI.LIB which is included in our CE.NET SDK |
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wtang
17 Posts |
Posted - 11 Jul 2003 : 12:27:25
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How to determine "indexNumAdapters". BTW, I run this code and change "OutputMessage" into "RETAILMSG". The system crashes when I call "ReleaseAddress" function.
The target board I'm running is ADS AGX build 4.10.00 |
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ggitsme
3 Posts |
Posted - 31 Jan 2005 : 16:09:17
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| Is this library available for Windows CE 3.0. I am using an ADS GC+ with the hpc2000 sdk ? |
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ken.yeung
20 Posts |
Posted - 04 Mar 2005 : 15:39:45
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I am working on CE 4.20.08 and 4.20.09 on AGX with VB.NET. Do I need to install the CE.NET SDK to use the function IpRenewAddress in IPHLPAPI.LIB?
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ctacke
877 Posts |
Posted - 04 Mar 2005 : 15:56:11
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| No. SDKs simply provide headers and LIBs for compiling and linking C/C++ applications. From managed code you'll be P/Invoking, which will load the library at run time based on the method signature you provide in your code. |
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ken.yeung
20 Posts |
Posted - 04 Mar 2005 : 16:44:40
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Thanks, Chris. I was testing the function IpRenewAddress and got the NotSupportedException right at the statement invoking IpRenewAddress(map). Any idea to fix this? The code is attached:
############################################
Imports System.Runtime.InteropServices
Module Module1
Sub Main()
Console.WriteLine("Begin...")
Dim map As New IP_ADAPTER_INDEX_MAP
map.Index = 2
map.Name = "SMC90001"
Dim result As Integer = _
IpRenewAddress(map)
Console.WriteLine("Result = " & result)
Console.ReadLine()
End Sub
Public Structure IP_ADAPTER_INDEX_MAP
Public Index As Integer
Public Name As String
End Structure
Declare Function IpRenewAddress Lib "Iphlpapi.lib" (ByRef AdapterInfo As IP_ADAPTER_INDEX_MAP) As Integer
End Module
####################################################
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ken.yeung
20 Posts |
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ctacke
877 Posts |
Posted - 04 Mar 2005 : 17:52:30
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Just looking at it, your definition of IP_ADAPTER_INDEX_MAP is wrong. Name is not a string, it's an array of 260 (MAX_PATH) TCHARs. You'll need to define it like this:
Public Structure IP_ADAPTER_INDEX_MAP
Public Index As Integer
Public Name As Byte(520)
End Structure
Then use Encoding.Unicode to change the array to a string.
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ken.yeung
20 Posts |
Posted - 18 Mar 2005 : 15:00:40
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Sorry, I didn't finish the previous reply!
I did the followings:
Dim ac As AdapterCollection = OpenNETCF.Net.Networking.GetAdapters
For Each ad As Adapter In ac
Dim map As New IP_ADAPTER_INDEX_MAP
map.Index = ad.Index
Dim coding As New ASCIIEncoding
map.name = Encoding.Convert(Encoding.ASCII, Encoding.Unicode, coding.GetBytes(ad.Name.PadRight(260, Chr(0))))
Dim result As Integer
result = IpReleaseAddress(map)
...
result = IpRenewAddress(map)
...
Next
....
Public Structure IP_ADAPTER_INDEX_MAP
Public Index As Integer
<VBFixedArray(519)> Public name() As Byte
End Structure
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The MissingMethodException was thrown at IpReleaseAddress.
However if I use the StringPtr described in the msdn webpage above for the name in IP_ADAPTER_INDEX_MAP, no exception was thrown; but I got result=C0000001 (Win32Exception) for IpReleaseAddress and result=0 (Success) for IpRenewAddress (I was wrong in the previous reply). However even it returns success for IpRenewAddress, the address is not renewed.
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ken.yeung
20 Posts |
Posted - 18 Mar 2005 : 15:04:00
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I put '<VBFixedArray(519)>' before 'Public name() As Byte' in the code provided in the above message. But it was not displayed after I posted the message.
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ken.yeung
20 Posts |
Posted - 18 Mar 2005 : 15:07:17
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I am sorry that the VBFixedArray(519) attribute (before Public name() As Byte) was not shown in the above two messages since the asp did not accept a pair of greater than and less than symbols.
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akidder
1519 Posts |
Posted - 18 Mar 2005 : 15:25:41
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| Yeah, the forums will eat characters that look like HTML. I've reformatted your posts above to maintain the formatting you provided (pre directive) and put in the HTML characters to display the greater than and less than symbols (> and <). |
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(C,VB.NET) Programmatically release/renew IP addr
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