MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH ALTIUM TASKING Specifications download pdf (Page 57)

Appendix A

A-12

PYTHON

Advise(connection, item[

timeout][, use_ACKREQ=0][, use_NODATA=0])

Establish an advise loop with a server.

The server will send data changed Advise events when new data is

present. If an advise loop already is present for the specified item, the

existing advise loop will be replaced.

The timeout is default set to 25 days, and has to be specified in

milliseconds. The timeout cannot be disabled.

use_ACKREQ has the server wait for us to tell we are ready for the next

data. Appar

ently required for older Windows versions, not for NT

. See

below. Using this option may cause Advise events to get lost.

use_NODATA tells the server to hold back the data, just send the data

changed notification event. Obtaining the data with a request from inside

the callback (see

Initialize

), causes r

eentrancy problems.

Returns nothing.

Since Python does not support Windows-style asynchronous callbacks,

neither via

Py_AddPendingCall() because of its fixed size buffer,

Advise data is stored in a linked list, which is emptied via one of

GetAdvisedItem(), GetAdvisedItemNoWait(). Hence, regularly call

one of these, to flush the underwater buffer.

WaitForAndProcessAllMessages()

Process forever (pump) all messages for the current thread. Only returns

on WM_QUIT or error. It is necessary for a DDE client to process events,

to service the Advise link. DDE Advise must be serviced, otherwise it

blocks the process's execution. Apparently the DDE callback simply runs

inside the process, on top of its stack.

Retur

ns 1 if a WM_QUIT message was r

eceived, else 0 signalling an error

occurred in

GetMessage().

Poke(connection, item

value[, timeout])

Send unsolicited data to the server The timeout is default set to 25 days,

and has to be specified in milliseconds. The timeout cannot be disabled.

Returns nothing.

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