On 2022-11-28 09:32, Yauheni Pervenenka via Interest wrote:
Hi, Tony, thanks for your reply,
OS: win 11
DB: SQLite
Unfortunately, QVariant::toByteArray returns size 52(hex 104),
QVariant::toString returns size 30
There is data returned by QVariant::toByteArray::toHex
Qt data in hex(size 104):
763130492d46c2ab4cc29c7bc2b0efbfbd78c29b29c3ab1e4723dea6efbfbdefbfbdefbfbdefbfbd66c2a275efbfbdefbfbdc4a6
Original value in hex
size(68): 763130492d46ab4c9c7bb0e9789b29c3ab1e4723dea6c8e5d2f9b266a275e1fbe4a6
there are some data that is parsed correct but time to time it is broken
On Mon, Nov 28, 2022 at 11:17 AM Tony Rietwyk <t...@rightsoft.com.au>
wrote:
Hi Yauheni,
You don't say which type of database you are using? There may be
issues
with the database client library altering the blob to UTF8. Though I
would expect the python code using the same client to have the same
problem.
Assuming that QVariant has the byte array unaltered, then
QVariant.toByteArray().length() should give 34. Using qstrlen,
suggests
that you are using QVariant.toString instead. To print the hex you
should just use QVariant.toByteArray().toHex().
Hope that helps,
Tony
On 28/11/2022 6:46 pm, Yauheni Pervenenka via Interest wrote:
> Hello, community
> I have faced with issue that qvariant using qstrlen for getting
data
> size, but sometimes it returns wrong size especially for BLOB
data(if
> there are some special symbols), are there any way to get data
correct?
>
> Note:
> Database value 34, python returns correct data size, but
> qvariant::toByteArray returns 52
>
> Python data and Database data in hex(size
>
68): 763130492d46ab4c9c7bb0e9789b29c3ab1e4723dea6c8e5d2f9b266a275e1fbe4a6
>
> Qt data in hex(size 104):
>
763130492d46c2ab4cc29c7bc2b0efbfbd78c29b29c3ab1e4723dea6efbfbdefbfbdefbfbdefbfbd66c2a275efbfbdefbfbdc4a6
>
Hi, most of the data is preserved in Qt but some other data is injected
midstream.
Just a guess, but maybe the Qt version has a multithreading issue, like
two threads are settings values in the same array at the same time.
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