Elmomc Multi-Axis Motion Controller-Maestro Instrukcja Użytkownika Pobierz pdf (Strona 109)

Return Value:

int - initialization status:

0 OK;

1 The API library is already initialized;

2 The COM library is already initialized on this thread;

3 A previous COM initialization specified a different apartment model for this

thread;

4 The COM library initialization failed;

5 The MAS Events mechanism initialization failed;

Use MAC_GetLastError to retrieve the error string.

Remarks:

MAC_Initialize() can initializes the COM library for use by the calling thread, sets the

thread's concurrency model, and creates a new apartment for the thread if one is required.

There are two types of apartments: single-threaded apartments, and multithreaded

apartments.

• Single-threaded Apartments—Single-threaded apartments consist of exactly one thread, so all

COM objects that live in a single-threaded apartment can receive method calls only from the

one thread that belongs to that apartment. All method calls to a COM object in a single-

threaded apartment are synchronized with the windows message queue for the single-

threaded apartment's thread. A process with a single thread of execution is simply a special

case of this model.

• Multithreaded Apartments

—Multithreaded apartments consist of one or more threads, so all

COM objects that live in a multithreaded apartment can receive method calls directly from

any of the threads that belong to the multithreaded apartment. Threads in a multithreaded

apartment use a model called free-threading. Calls to COM objects in a multithreaded

apartment are synchronized by the objects themselves.

Sample:

int nOk = MAC_Initialize(

COM_INIT_SINGLETHREADED, FALSE );

6.2 MAC_Uninitialize

This function enables the user to uninitialize Multi Axes Supervisor API Library.

Syntax:

void MAC_Uninitialize();

Sample:

MAC_Uninitialize();

Maestro Software Manual The Maestro API

MAN-MASSW (Ver. Q)

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