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"nicolasr" <nicolasrNOSPAMATSIGNgmx.net> ha scritto nel messaggio
news:3eca6dff@newsgroups.borland.com...
> Hi,
>
> you can call any Windows API function from within your VCL
> application, provided you include the right header files etc..
> Most Windows API stuff is ready to be used in C++Builder with the
> header files you find in the <include> directory.
> So what exactly is the problem?
>
> regards,
> Nick
>
>
Hi Nick,

I want to use,in my application, SENDARP function, this function is included
in iphdpapi.dll.
In microsoft web site i see this exemple:
Example Code
The following code demonstrates how to obtain the media access control (MAC)
address associated with a specified IP address.
//
// Link with ws2_32.lib and iphlpapi.lib
//

#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <iphlpapi.h>


int __cdecl main()
{
    HRESULT hr;
    IPAddr  ipAddr;
    ULONG   pulMac[2];
    ULONG   ulLen;

    ipAddr = inet_addr ("192.168.25.31");
    memset (pulMac, 0xff, sizeof (pulMac));
    ulLen = 6;

    hr = SendARP (ipAddr, 0, pulMac, &ulLen);
    printf ("Return %08x, length %8d\n", hr, ulLen);

    size_t i, j;
    char * szMac = new char[ulLen*3];
    PBYTE pbHexMac = (PBYTE) pulMac;

    //
    // Convert the binary MAC address into human-readable
    //
    for (i = 0, j = 0; i < ulLen - 1; ++i) {
        j += sprintf (szMac + j, "%02X:", pbHexMac[i]);
    }

    sprintf (szMac + j, "%02X", pbHexMac[i]);
    printf ("MAC address %s\n", szMac);

    delete [] szMac;

    return 0;
}
//----------------------------
I use Borland c++ 5 builder and The following code is my application:

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//-------------------
#include <winsock2.h>
#include <windows.h>
#include <stdio.h>
#include <tchar.h>
#include <iphlpapi.h>
//------------------------------------


//--------------------------------------------------------------------------
-
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//--------------------------------------------------------------------------
-
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
 WSADATA wsa = {0};
        if( WSAStartup(MAKEWORD(2, 0), &wsa) != 0 )
        ShowMessage("winsock2 non present");
            // the requested WinSock version is not available
}
//--------------------------------------------------------------------------
-
---------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
//int __cdecl main()
//{
    HRESULT hr;
    IPAddr  ipAddr;
    IPAddr  ipAddr2;
    ULONG   pulMac[2];
    ULONG   ulLen;

    ipAddr = inet_addr ("10.10.50.2");
     ipAddr2 = inet_addr ("10.10.50.3");
    memset (pulMac, 0xff, sizeof (pulMac));
    ulLen = 6;

    hr = SendARP (ipAddr, ipAddr2, pulMac, &ulLen);
    printf ("Return %08x, length %8d\n", hr, ulLen);

    size_t i, j;
    char * szMac = new char[ulLen*3];
    PBYTE pbHexMac = (PBYTE) pulMac;

    //
    // Convert the binary MAC address into human-readable
    //
    for (i = 0, j = 0; i < ulLen - 1; ++i) {
        j += sprintf (szMac + j, "%02X:", pbHexMac[i]);
    }

    sprintf (szMac + j, "%02X", pbHexMac[i]);
    printf ("MAC address %s\n", szMac);

    delete [] szMac;

  // return 0;
//}
}
//--------------------------------------------------------------------------
-
void __fastcall TForm1::FormDestroy(TObject *Sender)
{
 WSACleanup();
}
//------------------------------

when i run I have this error:
[Linker Error] Unresolved external 'SendARP' referenced from
C:\MACADDRESS4\UNIT1.OBJ
 I don't understand where is the problem..
Tahnks for all Nick