What is the meaning of SINGLEUSE, MULTIUSE, MULTI_SEPARATE, SUSPENDED, SURROGATE in COM Exe?

These are enum types used for registering a COM exe to service control manager. Following list describes the meaning and value of each enum members.

  • REGCLS_SINGLEUSE [ = 0] - Class object only generates one instance
  • REGCLS_MULTIPLEUSE [ = 1] - Same class object generates multiple instances and local automatically goes into inproc tbl.
  • REGCLS_MULTI_SEPARATE [ = 2] - multiple use, but separate control over each context.
  • REGCLS_SUSPENDED [ = 4] - register is as suspended, will be activated when app calls CoResumeClassObjects
  • REGCLS_SURROGATE [ = 8] - must be used when a surrogate process is registering a class object that will be loaded in the surrogate

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