Since this is a pcaspy only bug, I created the report in the project issue tracker.
https://code.google.com/p/pcaspy/issues/detail?id=14
Thanks for the detective work to reveal the bug.
Best
Xiaoqiang
> On 03 Mar 2015, at 18:54, Jameson Graef Rollins <[email protected]> wrote:
>
> On Tue, Mar 03 2015, "Kasemir, Kay" <[email protected]> wrote:
>> On Mar 3, 2015, at 12:19 PM, Andrew Johnson <[email protected]>
>> wrote:
>>
>>> On 03/03/2015 11:04 AM, Kasemir, Kay wrote:
>>>> Until the PV is initialized, I get the same
>>>>
>>>> No conversion between src & dest types no conversion between event
>>>> app type=16 and DBR type=18 Element count=60
>>>>
>>>> error.
>>>
>>> The implication is that pcaspy is presenting an uninitialized channel's
>>> value to the cas as some type which gdd can't convert into to an array
>>> of chars. The answer may be as simple as always initializing the value
>>> of a string channel to be an empty string.
>>
>> .. which I just found can be done like this:
>>
>> self.setParam('ThatPV', [ 0 ])
>>
>> That seems to work for clients that look for a long string, since they end on the first '\0'.
>
> Interesting. I can confirm this works as well. In fact, just setting
> the initial 'value' to [0] in the database definition does the trick as
> well:
>
> 'STR': {
> 'type': 'char',
> 'count': 60,
> 'value': [0],
> }
>
> Thanks for the sleuthing, Kay. Maybe we can put together a patch that
> changes how these records are initialized inside of pcaspy.
>
> I just realized that camonitor is showing worse behavior than MEDM in
> regards to these improperly initialized records; it just hangs with no
> output at all until a valid value has been written to the array.
>
> jamie.
- Replies:
- Re: "No conversion between src & dest" warning with pcaspy Jameson Graef Rollins
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- Re: "No conversion between src & dest" warning with pcaspy Andrew Johnson
- Re: "No conversion between src & dest" warning with pcaspy Kasemir, Kay
- Re: "No conversion between src & dest" warning with pcaspy Andrew Johnson
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