Dynamically load and detect iphlpapi. Makes rpcrt4 work on systems without the DLL and also does not force every app on the system to load the network libraries like before

Modified: trunk/reactos/lib/rpcrt4/rpcrt4_main.c

--- trunk/reactos/lib/rpcrt4/rpcrt4_main.c	2005-05-26 13:44:14 UTC (rev 15512)
+++ trunk/reactos/lib/rpcrt4/rpcrt4_main.c	2005-05-26 13:45:08 UTC (rev 15513)
@@ -319,6 +319,8 @@

     *time += TICKS_15_OCT_1582_TO_1601;
 }
 

+typedef DWORD WINAPI (*LPGETADAPTERSINFO)(PIP_ADAPTER_INFO pAdapterInfo, PULONG pOutBufLen);
+

 /* Assume that a hardware address is at least 6 bytes long */ 
 #define ADDRESS_BYTES_NEEDED 6
 
@@ -329,28 +331,46 @@

 
     ULONG buflen = sizeof(IP_ADAPTER_INFO);
     PIP_ADAPTER_INFO adapter = HeapAlloc(GetProcessHeap(), 0, buflen);

+    HANDLE hIpHlpApi;
+    LPGETADAPTERSINFO pGetAdaptersInfo;
+    
+    hIpHlpApi = LoadLibrary("iphlpapi.dll");
+    if (hIpHlpApi)
+    {
+        pGetAdaptersInfo = (LPGETADAPTERSINFO)GetProcAddress(hIpHlpApi, "GetAdaptersInfo");
+        if (pGetAdaptersInfo)
+        {
+            if (pGetAdaptersInfo(adapter, &buflen) == ERROR_BUFFER_OVERFLOW) {
+                HeapFree(GetProcessHeap(), 0, adapter);
+                adapter = HeapAlloc(GetProcessHeap(), 0, buflen);
+            }

-    if (GetAdaptersInfo(adapter, &buflen) == ERROR_BUFFER_OVERFLOW) {
-        HeapFree(GetProcessHeap(), 0, adapter);
-        adapter = HeapAlloc(GetProcessHeap(), 0, buflen);
-    }
-
-    if (GetAdaptersInfo(adapter, &buflen) == NO_ERROR) {
-        for (i = 0; i < ADDRESS_BYTES_NEEDED; i++) {
-            address[i] = adapter->Address[i];

+            if (pGetAdaptersInfo(adapter, &buflen) == NO_ERROR) {
+                for (i = 0; i < ADDRESS_BYTES_NEEDED; i++) {
+                    address[i] = adapter->Address[i];
+                }
+            }
+            else
+            {
+                goto local;
+            }   

         }

+        
+        /* Free the Library */
+        FreeLibrary(hIpHlpApi);
+        goto exit;

     }

+     
+local:   

     /* We can't get a hardware address, just use random numbers.

-       Set the multicast bit to prevent conflicts with real cards. */
-    else {
-        for (i = 0; i < ADDRESS_BYTES_NEEDED; i++) {
-            address[i] = rand() & 0xff;
-        }
-
-        address[0] |= 0x01;
-        status = RPC_S_UUID_LOCAL_ONLY;

+        Set the multicast bit to prevent conflicts with real cards. */
+    for (i = 0; i < ADDRESS_BYTES_NEEDED; i++) {
+        address[i] = rand() & 0xff;

     }

-

+    address[0] |= 0x01;
+    status = RPC_S_UUID_LOCAL_ONLY;
+    
+exit:

     HeapFree(GetProcessHeap(), 0, adapter);
     return status;
 }