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// Suppose this application belonged to AcmeSoft. AcmeSoft wants to
// keep track of the number of times this application is
// executed. They want two counters: one counts the number of
// executions per machine, the other keeps track of the number of
// executions per user.
//
// This application uses the ACE_Registry class to create and update
// entries in the LOCAL_MACHINE and CURRENT_USER predefined registries
// to store the counters.
//
// Note that this application will not work with remote registries
// if used with the CURRENT_USER predefined registry.
#include "ace/Registry.h"
// Name for application's naming context
static ACE_Registry::Name application_context_name;
// Name for instance counter.
static ACE_Registry::Name counter_name;
// Protypes
static int update_counter (HKEY predefined,
u_long ¤t_counter);
static void setup_names ();
int
main(int argc, char *argv[])
{
int result;
u_long current_counter = 0;
// initialize name
setup_names ();
// Update counter per user
result = ::update_counter (HKEY_CURRENT_USER,
current_counter);
if (result == 0)
{
cout << "User counter: " << current_counter << endl;
// Update counter per machine
result = ::update_counter (HKEY_LOCAL_MACHINE,
current_counter);
if (result == 0)
cout << "Machine counter: " << current_counter << endl;
}
if (result != 0)
ACE_DEBUG ((LM_DEBUG, "test failed\n"));
else
ACE_DEBUG ((LM_DEBUG, "test succeeded\n"));
return 0;
}
static int
update_counter (HKEY predefined,
u_long ¤t_counter)
{
int result;
ACE_Registry::Naming_Context parent_context;
ACE_Registry::Naming_Context application_context;
// Connect to predefined entry
result = ACE_Predefined_Naming_Contexts::connect (parent_context,
predefined);
if (result != 0)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "ACE_Predefined_Naming_Contexts::connect failed"), -1);
// Find application context name
result = parent_context.resolve_context (application_context_name,
application_context);
if (result != 0)
// Failed to find: create a new context
result = parent_context.bind_new_context (application_context_name,
application_context);
if (result != 0)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "ACE_Registry::Naming_Contexts::bind/resolve_context failed"), -1);
// Counter
u_long counter = 0;
// Represent counter as an ACE_Registry::Object
ACE_Registry::Object object ((void *) &counter,
sizeof counter,
REG_DWORD);
// Find counter
result = application_context.resolve (counter_name,
object);
if (result != 0)
// Failed to find: create new binding for object
{
counter = 1;
result = application_context.bind (counter_name,
object);
}
else
// Counter was found
{
// increment counter
counter++;
// Update
result = application_context.rebind (counter_name,
object);
}
if (result != 0)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "ACE_Registry::Naming_Contexts::bind/resolve failed"), -1);
else
current_counter = counter;
return 0;
}
static void
setup_names ()
{
// Stupid implementation of STL is broken
/*
::application_context_name.reserve (4);
::application_context_name [0].id_ = __TEXT ("Software");
::application_context_name [1].id_ = __TEXT ("AcmeSoft");
::application_context_name [2].id_ = __TEXT ("AcmeApplication");
::application_context_name [3].id_ = __TEXT ("1.0");
::counter_name.reserve (1);
::counter_name [0].id_ = __TEXT ("Instance Counter");
*/
ACE_Registry::Name_Component component;
component.id_ = __TEXT ("Software"), ::application_context_name.push_back (component);
component.id_ = __TEXT ("AcmeSoft"), ::application_context_name.push_back (component);
component.id_ = __TEXT ("AcmeApplication"), ::application_context_name.push_back (component);
component.id_ = __TEXT ("1.0"), ::application_context_name.push_back (component);
component.id_ = __TEXT ("Instance Counter"), ::counter_name.push_back (component);
}
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