FileStorage key only takes letters as first value. (Bug #2295)

Added by Andreas Holz over 12 years ago. Updated about 12 years ago.

Status:	Cancelled	Start date:	2012-08-23
Priority:	Low	Due date:
Assignee:	-	% Done:	0%
Category:	documentation
Target version:	2.4.4
Affected version:	branch '2.4'	Operating System:
Difficulty:		HW Platform:
Pull request:

Description

I'm not sure if that's a bug, or just not reported in the documentation

http://docs.opencv.org/2.4.2/modules/core/doc/xml_yaml_persistence.html

Example Code:

std::stringstream str2;
str2 <<  i << "_" << k << "_" n;
filestorage_ << str2.str().c_str() << tmp_matrix;

Error message

OpenCV Error: Unspecified error (Incorrect element name 4_0_0) in operator<<, file /home/andreas/Downloads/OpenCV-2.4.2/modules/core/src/persistence.cpp, line 5239

It took me a couple of hours to figure out, that it only takes a letter as first key value.

Looking at persistence.cpp it checks cv_isalpha on the char.
I don't know if that's a XML / YAML specification or just a bug.
But please mention it in the documentation :)

Cheers,
Andreas

Associated revisions

Revision 86b6c487
Added by Andrey Pavlenko about 11 years ago

Merge pull request #2295 from alalek:opencl_align_rw_buffers

History

#1
Updated by Vadim Pisarevsky over 12 years ago

Target version deleted ()

#2
Updated by dongsun shin over 12 years ago

I read your problem. But, I think this is not an error.
in the xml_yaml document, 'name' and 'value' have to read sequencially.
for example..
filestorage_ << "name" << 5;
but your example is as below
filestorage_ << 5 << "_" << 6;

"_" is not an alphabet and that is not a name.

Best Regards
dsshin. ([email protected])

Andreas Holz wrote:

I'm not sure if that's a bug, or just not reported in the documentation

http://docs.opencv.org/2.4.2/modules/core/doc/xml_yaml_persistence.html

Example Code:

[...]

Error message

[...]

It took me a couple of hours to figure out, that it only takes a letter as first key value.

Looking at persistence.cpp it checks cv_isalpha on the char.
I don't know if that's a XML / YAML specification or just a bug.
But please mention it in the documentation :)

Cheers,
Andreas