Difference between revisions of "MQCREATE()"
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==Purpose== | ==Purpose== | ||
Create a message queue and open a pointer to the queue | Create a message queue and open a pointer to the queue | ||
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==Syntax== | ==Syntax== | ||
MQCREATE(<expC> [,<expN>]) | MQCREATE(<expC> [,<expN>]) | ||
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==See Also== | ==See Also== | ||
| − | [[MQCLOSE()]], [[MQCURMSGS()]], [[MQOPEN()]], [[MQRECEIVE()]], [[MQSEND()]], [[MQUNLINK()]], [[XML_DECODE()]], [[XML_ENCODE()]], [[XML_GATHER()]], [[XML_SCATTER()]] | + | [[JSON_DECODE()]], [[JSON_DECODE_FILE()]], [[JSON_ENCODE()]], [[MQCLOSE()]], [[MQCURMSGS()]], [[MQOPEN()]], [[MQRECEIVE()]], [[MQSEND()]], [[MQSENDMESSAGE()]], [[MQUNLINK()]], [[XML_DECODE()]], [[XML_ENCODE()]], [[XML_GATHER()]], [[XML_SCATTER()]] |
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==Description== | ==Description== | ||
The MQCREATE() function creates and opens a new message queue. It returns a numeric pointer when the queue is opened successfully, or a -1 if unsuccessful. The <expC> is the name of the queue to create and open. Since the pointer is required to identify an open queue to other messaging functions, always assign the return value to a memory variable. The optional <expN> determines the queue access mode: | The MQCREATE() function creates and opens a new message queue. It returns a numeric pointer when the queue is opened successfully, or a -1 if unsuccessful. The <expC> is the name of the queue to create and open. Since the pointer is required to identify an open queue to other messaging functions, always assign the return value to a memory variable. The optional <expN> determines the queue access mode: | ||
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!<expN>||Access Mode | !<expN>||Access Mode | ||
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The MQCLOSE() function is used to close a queue which has been opened with MQCREATE() or MQOPEN(). | The MQCLOSE() function is used to close a queue which has been opened with MQCREATE() or MQOPEN(). | ||
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==Example== | ==Example== | ||
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</code> | </code> | ||
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[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] | ||
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[[Category:Messaging Functions]] | [[Category:Messaging Functions]] | ||
[[Category:Lianja VFP Extensions]] | [[Category:Lianja VFP Extensions]] | ||
[[Category:VFP Function Extensions]] | [[Category:VFP Function Extensions]] | ||
Latest revision as of 04:04, 30 March 2017
Contents
Purpose
Create a message queue and open a pointer to the queue
Syntax
MQCREATE(<expC> [,<expN>])
See Also
JSON_DECODE(), JSON_DECODE_FILE(), JSON_ENCODE(), MQCLOSE(), MQCURMSGS(), MQOPEN(), MQRECEIVE(), MQSEND(), MQSENDMESSAGE(), MQUNLINK(), XML_DECODE(), XML_ENCODE(), XML_GATHER(), XML_SCATTER()
Description
The MQCREATE() function creates and opens a new message queue. It returns a numeric pointer when the queue is opened successfully, or a -1 if unsuccessful. The <expC> is the name of the queue to create and open. Since the pointer is required to identify an open queue to other messaging functions, always assign the return value to a memory variable. The optional <expN> determines the queue access mode:
| <expN> | Access Mode |
|---|---|
| Unspecified | Read only access |
| 0 | Read only access |
| 1 | Write only access |
| 2 | Read/Write access |
The MQCLOSE() function is used to close a queue which has been opened with MQCREATE() or MQOPEN().
Example
// Open up the queue for read/write access mqdes=mqcreate("/myqueue2", 2) if (mqdes < 0) messagebox(strerror()+",errno="+alltrim(str(error()))) return endif // send a message to the queue rc = mqsend(mqdes, "Test message") if (rc < 0) messagebox(strerror()+",errno="+alltrim(str(error()))) return endif mqclose(mqdes)
