Re: "No conversion between src & dest" warning with pcaspy

["Wang Xiaoqiang (PSI)" <xiaoqiang.wang@psi.ch>]

Hi Jamie, Kay,

The problem is indeed with empty strings. That causes an invalid zero sized gdd value.
The fix is to ensure it is null terminated.
See my comment at https://code.google.com/p/pcaspy/issues/detail?id=14

It is a one-liner fix, which you can apply on your installation easily.

Best
Xiaoqiang

> On 03 Mar 2015, at 22:40, Jameson Graef Rollins <jrollins@ligo.caltech.edu> wrote:
> 
> On Tue, Mar 03 2015, "Wang Xiaoqiang (PSI)" <xiaoqiang.wang@psi.ch> wrote:
>> 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.
> 
> Hey, Xiaoqiang.  I think the problem might actually be more insidious
> than I originally thought.  It seems that if the value for a char array
> is every set to an array of null bytes this described error will be
> thrown when a monitoring clients connects to the channel.  Clients that
> are already connected to the channel will also throw an error and not
> update their values if the value is set to an array of null bytes.
> 
> I thought before that this problem was relatively innocuous, since it
> would have only been a startup problem.  But now I see that whenever my
> pcaspy application clears the char array PV, all connected clients show
> the bad behavior.
> 
> I haven't had any luck tracking down where in the pcaspy the problem may
> be coming from.
> 
> jamie.