ZBasic System Library
250
ZBasic Microcontrollers
Type
Subroutine
Invocation
PutQueueStr(queue, str)
Parameter
Method
Type
Description
queue
ByRef
array of Byte
The queue to which to write data.
str
ByVal
String
The string to be written to the queue.
Discussion
This routine writes the characters from the string to the specified queue. If there is insufficient space in
the queue, the calling task will suspend until space becomes available. Note, particularly, that no data
will be written until there is room for all the data to be written. This has two important ramifications.
Firstly, if the number of bytes to be written is larger than the data capacity of the queue, the write will
never complete. Secondly, if data is never taken out of the queue thus making room for the additional
data, the write will also never complete.
Note that before any queue operations are performed, the queue data structure must be initialized. See
the discussion of OpenQueue() for more details. Also, attempting to put data in a queue that has been
assigned to a Com port as the receive queue will produce undefined results.
Example
Dim outQueue(1 to 40) as Byte
Call OpenQueue(outQueue, SizeOf(outQueue))
Call PutQueueStr(outQueue, "Hello, world!")
Compatibility
BasicX allows any type for the first parameter. The ZBasic implementation requires that it be an array of
Byte.
See Also
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