Using Services

Services provide several important advantages for ActiveX designers:

• Your designers requires less code, because you can use the host's service implementations instead of writing designer code to perform common tasks.
  
  
• Applications operate more efficiently. QueryService returns a pointer to a requested interface, instead of delegating method calls through the container.
  
  
• Designers can ensure compatibility with multiple hosts.

The following sections describe how to find and call services, and what the differences are between using services and using the QueryInterface method.