--- mstools/samples/ole/clidemo/register.c	2018/08/09 18:20:49	1.1
+++ mstools/samples/ole/clidemo/register.c	2018/08/09 18:24:00	1.1.1.2
@@ -121,7 +121,7 @@ BOOL FAR RegCopyClassName(             /
    CHAR           szKey[KEYNAMESIZE];  //* key name string
    INT            i;                   //* index
 
-   szClass[0] = NULL;
+   szClass[0] = '\0';
 
    if (!RegOpenKey(HKEY_CLASSES_ROOT, szClass, &hkeyTemp)) 
    {
@@ -143,7 +143,7 @@ BOOL FAR RegCopyClassName(             /
       RegCloseKey(hkeyTemp);
    }
 
-   *lpstrClassName = NULL;
+   *lpstrClassName = 0;
    return FALSE;
 
 }
@@ -171,7 +171,7 @@ BOOL FAR RegGetClassNames(       //* ENT
 
    SendMessage(hwndList, LB_RESETCONTENT, 0, 0L);
 
-   szClass[0]=NULL;
+   szClass[0]='\0';
 
    if (!RegOpenKey(HKEY_CLASSES_ROOT, szClass, &hkeyTemp)) 
    {