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| <== Date ==> | <== Thread ==> |
|---|
| Subject: | Re: record field max length? |
| From: | "Johnson, Andrew N. via Tech-talk" <[email protected]> |
| To: | William Kirstaedter <[email protected]>, "[email protected] Talk" <[email protected]> |
| Date: | Wed, 12 Dec 2018 16:29:38 +0000 |
On 12/12/18 8:59 AM, William Kirstaedter via Tech-talk wrote:Short Question:Longer answer: That depends on the field definition for the record type. DESC is defined in dbCommon.dbd (a kind of super-class used by all record types) as: field(DESC,DBF_STRING) {That means it's a DBF_STRING and the size() entry says it can hold up to 41 characters, but there must be a zero-byte terminator so the limit is really 40 (which matches the Channel Access dbr_string_t typedef). For something like the ZRST field of the mbbi record which defines an enumeration string, the size is given as 26 which is the size of the enumeration strings that Channel Access can send in a struct dbr_gr_enum. An INP or OUT field is a link and for these the maximum length depends on the version of EPICS you're running; it might be 40 for older versions, 80, 256 for some or unlimited for EPICS-7. HTH, - Andrew -- Arguing for surveillance because you have nothing to hide is no different than making the claim, "I don't care about freedom of speech because I have nothing to say." -- Edward Snowdon |