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| PInvoke, Does anyone know ? |
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This message was discovered on microsoft.public.dotnet.languages.csharp.
| Koos du Preez |
I'm trying to call a API with c# and i'm having some trouble.. could
someone please help on calling this function with c#
I dont know how to call the API with these structures that use pointers etc.
PLEASE help ...
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tcpip/tcpip
_26sl.asp
this is the function:
DWORD GetIpAddrTable(
PMIB_IPADDRTABLE pIpAddrTable, // [out] buffer for mapping table
PULONG pdwSize, // [in/out] size of buffer
BOOL bOrder // [in] sort the table
);
//table mapping sruct:
typedef struct _MIB_IPADDRTABLE {
DWORD dwNumEntries; // number of entries in the table
MIB_IPADDRROW table[ANY_SIZE]; // array of IP address entries
} MIB_IPADDRTABLE, *PMIB_IPADDRTABLE;//IP Address struct:typedef struct
_MIB_IPADDRROW {
DWORD dwAddr; // IP address
DWORD dwIndex; // interface index
DWORD dwMask; // subnet mask
DWORD dwBCastAddr; // broadcast address
DWORD dwReasmSize; // re-assembly size
unsigned short unused1; // not currently used
unsigned short unused2; // not currently used
} MIB_IPADDRROW, *PMIB_IPADDRROW;Members
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| Mattias Sjögren |
Koos,
Try the code below.
Mattias
===
Mattias Sjögren (VB MVP)
mattias @ mvps.org
http://www.msjogren.net/dotnet/
using System;
using System.Net;
using System.Runtime.InteropServices;
struct MIB_IPADDRROW
{
public int dwAddr;
public int dwIndex;
public int dwMask;
public int dwBCastAddr;
public int dwReasmSize;
public short unused1;
public short unused2;
}
class C
{
[DllImport("iphlpapi.dll")]
static extern int GetIpAddrTable(
IntPtr pIpAddrTable,
ref int pdwSize,
bool bOrder);
static string IPToString(int ipaddr)
{
return String.Format( "{0}.{1}.{2}.{3}",
(ipaddr >> 24) & 0xFF, (ipaddr >> 16) & 0xFF,
(ipaddr >> 8) & 0xFF, ipaddr & 0xFF);
}
static void Main()
{
IntPtr pBuf = IntPtr.Zero;
int nBufSize = 0;
GetIpAddrTable( IntPtr.Zero, ref nBufSize, false );
try {
pBuf = Marshal.AllocHGlobal( nBufSize );
int r = GetIpAddrTable( pBuf, ref nBufSize, false );
if ( r != 0 )
throw new System.ComponentModel.Win32Exception( r );
#if USE_UNSAFE_CODE
unsafe {
int nNumRows = *((int*)(void*)pBuf);
MIB_IPADDRROW* pRow =
(MIB_IPADDRROW*)(void*)(IntPtr)((int)pBuf + sizeof(int));
while ( nNumRows-- > 0 ) {
Console.WriteLine( "---" );
Console.WriteLine( IPToString( IPAddress.NetworkToHostOrder(
pRow->dwAddr ) ) );
Console.WriteLine( pRow->dwIndex );
Console.WriteLine( IPToString( IPAddress.NetworkToHostOrder(
pRow->dwMask ) ) );
Console.WriteLine( IPToString( IPAddress.NetworkToHostOrder(
pRow->dwBCastAddr ) ) );
Console.WriteLine( pRow->dwReasmSize );
pRow++;
}
}
#else
Type tIPAddrRow = typeof(MIB_IPADDRROW);
int nNumRows = Marshal.ReadInt32( pBuf );
IntPtr pRow = unchecked((IntPtr)((int)pBuf + 4));
while ( nNumRows-- > 0 ) {
MIB_IPADDRROW row = (MIB_IPADDRROW)Marshal.PtrToStructure(
pTmp, tIPAddrRow );
Console.WriteLine( "---" );
Console.WriteLine( IPToString( IPAddress.NetworkToHostOrder(
row.dwAddr ) ) );
Console.WriteLine( row.dwIndex );
Console.WriteLine( IPToString( IPAddress.NetworkToHostOrder(
row.dwMask ) ) );
Console.WriteLine( IPToString( IPAddress.NetworkToHostOrder(
row.dwBCastAddr ) ) );
Console.WriteLine( row.dwReasmSize );
pRow = unchecked((IntPtr)((int)pRow + Marshal.SizeOf(
tIPAddrRow )));
}
#endif
}
catch (Exception ex) {
Console.WriteLine( ex.Message );
}
finally {
if ( pBuf != IntPtr.Zero )
Marshal.FreeHGlobal( pBuf );
}
}
}
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| Koos du Preez |
WOW !!!!! Thats Awesome !! How the hell do you know all this stuff, I had
NO idea about the Marshal class..
this is REALY awesome, Thats exactly what I had a hard time doing; getting
buffer pointer into a structure !!
you are the King and I salute you !!
thanks a bunch,
Regards,
Koos
"Mattias Sjögren" <Click here to reveal e-mail address> wrote in message
news:#z9ohUotBHA.1860@tkmsftngp04...
[Original message clipped]
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| Russell Mangel |
This looks like modem noise, or maybe you sent a sendmail configuration
file. Ha!
Say, Mr. PInvoke... Can you help with this:
Several people in the .NET newsgroups, have been asking on how to retrieve
the associated icon for a given file type, usually for display in a treeview
or listview control. I have been informed by a few C++ people who claim the
only way to get these icons using C# is to make a call to the WIN API
(shgetfileinfo, I think). Is there an easier way for us to get these icons
programmtically? If not, do you have any idea, or suggestion which might
lead us to some code that would help us out?
Thanks
Signed
- Scratching and Clawing my way through C#/.NET
"Mattias Sjögren" <Click here to reveal e-mail address> wrote in message
news:#z9ohUotBHA.1860@tkmsftngp04...
[Original message clipped]
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| Mattias Sjögren |
Russell,
>Is there an easier way for us to get these icons programmtically?
No
[Original message clipped]
As you said yourself, this question has been asked, and answered, a
number of times before. I'm sure you can find some code by searching
for SHGetFileInfo in the microsoft.public.dotnet.* hierarchy at
groups.google.com.
Mattias
===
Mattias Sjögren (VB MVP)
mattias @ mvps.org
http://www.msjogren.net/dotnet/
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| David Ball |
When I searched for examples of using iphlpapi.dll, I found your
example. Unfortunately, when I tried to compile this with the
release version of C#, I got an error (see below). Could you offer a
suggestion ?
BTW, thanks for all the helpful messages you've posted here.
TIA,
-- David Ball
On Sat, 16 Feb 2002 02:01:25 +0100, Mattias Sjögren
<Click here to reveal e-mail address> wrote:
[Original message clipped]
^^^^^ It complains that "The Name pTmp does not exist in the class
or namespace LearnIpHlpApi.Class1.C"
I tried removing the namespace directives so it would match your
example exactly but it only changed the error message to "The Name
pTmp does not exist in the class or namespace Class1.C"
[Original message clipped]
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