Add more debug info and better error control, from Elrond.
A few minor changes by me.

Modified: trunk/reactos/lib/iphlpapi/ifenum_reactos.c
Modified: trunk/reactos/lib/iphlpapi/iphlpapi_main.c

--- trunk/reactos/lib/iphlpapi/ifenum_reactos.c	2005-11-27 06:48:34 UTC (rev 19675)
+++ trunk/reactos/lib/iphlpapi/ifenum_reactos.c	2005-11-27 11:29:07 UTC (rev 19676)
@@ -40,7 +40,7 @@

 #include "ifenum.h"
 #include <assert.h>
 

-#define NDEBUG

+#define DEBUG

 #include "debug.h"
 
 /* Globals */
@@ -95,7 +95,9 @@

     /* String does not need to be freed: it points to the constant
      * string we provided */
 

-    TRACE("returning %08x\n", (int)status);

+    if (!NT_SUCCESS(status)) {
+        DPRINT1("openTcpFile for <%wZ> failed: 0x%lx\n", &fileName, status);
+    }

 
     return status;
 }
@@ -356,9 +358,13 @@

     BOOL interfaceInfoComplete;
     int curInterf = 0, i;
 

-    if( NT_SUCCESS(status) )
-        infoSetInt = HeapAlloc( GetProcessHeap(), 0, 
-                                sizeof(IFInfo) * numEntities );

+    if (!NT_SUCCESS(status)) {
+        DPRINT1("getInterfaceInfoSet: tdiGetEntityIDSet() failed: 0x%lx\n", status);
+        return status;
+    }
+
+    infoSetInt = HeapAlloc( GetProcessHeap(), 0, 
+                            sizeof(IFInfo) * numEntities );

     
     if( infoSetInt ) {
         for( i = 0; i < numEntities; i++ ) {
@@ -643,6 +649,11 @@

         name ? 
         getInterfaceInfoByName( tcpFile, name, ifInfo ) :
         getInterfaceInfoByIndex( tcpFile, index, ifInfo );

+
+    if (!NT_SUCCESS(status)) {
+        DPRINT1("getIPAddrEntryForIf returning %lx\n", status);
+    }
+

     return status;
 }
 
@@ -848,10 +859,14 @@

       *NteInstance = Data.NewAddress;
   }
 

+  if (!NT_SUCCESS(status)) {
+      DPRINT1("addIPAddress for if %d returning 0x%lx\n", IfIndex, status);
+  }
+

   switch( status ) {

-  case STATUS_SUCCESS: return ERROR_SUCCESS;
-  case STATUS_DEVICE_DOES_NOT_EXIST: return ERROR_DEV_NOT_EXIST;
-  default: return status;

+      case STATUS_SUCCESS: return ERROR_SUCCESS;
+      case STATUS_DEVICE_DOES_NOT_EXIST: return ERROR_DEV_NOT_EXIST;
+      default: return status;

   }
 }
 
@@ -878,6 +893,13 @@

 
   closeTcpFile( tcpFile );
 

-  if( NT_SUCCESS(status) ) return ERROR_SUCCESS;
-  else return ERROR_GEN_FAILURE;

+  if (!NT_SUCCESS(status)) {
+      DPRINT1("deleteIpAddress(%lu) returning 0x%lx\n", NteContext, status);
+  }
+
+
+  if( NT_SUCCESS(status) ) 
+	  return ERROR_SUCCESS;
+  else 
+	  return ERROR_GEN_FAILURE;

 }

--- trunk/reactos/lib/iphlpapi/iphlpapi_main.c	2005-11-27 06:48:34 UTC (rev 19675)
+++ trunk/reactos/lib/iphlpapi/iphlpapi_main.c	2005-11-27 11:29:07 UTC (rev 19676)
@@ -37,7 +37,7 @@

 # include <resolv.h>
 #endif
 

-

+#define DEBUG

 #include "windef.h"
 #include "winbase.h"
 #include "winreg.h"
@@ -84,7 +84,7 @@

  */
 DWORD WINAPI AddIPAddress(IPAddr Address, IPMask Netmask, DWORD IfIndex, PULONG NteContext, PULONG NteInstance)
 {

-    return addIPAddress( Address, Netmask, IfIndex, NteContext, NteInstance );

+    return RtlNtStatusToDosError(addIPAddress(Address, Netmask, IfIndex, NteContext, NteInstance));

 }
 
 
@@ -402,7 +402,7 @@

 DWORD WINAPI DeleteIPAddress(ULONG NTEContext)
 {
   TRACE("NTEContext %ld\n", NTEContext);

-  return deleteIpAddress( NTEContext );

+  return RtlNtStatusToDosError(deleteIpAddress(NTEContext));

 }
 
 
@@ -613,7 +613,7 @@

                 winsEnabled = TRUE;
               RegCloseKey(hKey);
             }

-

+			TRACE("num of index is %lu\n", table->numIndexes);

             for (ndx = 0; ndx < table->numIndexes; ndx++) {
               PIP_ADAPTER_INFO ptr = &pAdapterInfo[ndx];
               DWORD addrLen = sizeof(ptr->Address), type;