Hi all,
Now I’m building some signaling blocks having dual output streams.
But if I try to make dual output streams which have different data type
from
input stream, ‘Segmentation fault’ error is occurred. How can I make
dual
outputs which have different data type from input stream?
Thanks in advance.
Yong
–
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On Fri, Mar 06, 2009 at 11:03:28AM -0800, Yong J. Chang wrote:
Hi all,
Now I’m building some signaling blocks having dual output streams.
But if I try to make dual output streams which have different data type from
input stream, ‘Segmentation fault’ error is occurred. How can I make dual
outputs which have different data type from input stream?
Thanks in advance.
Yong
Have you read
http://www.gnu.org/software/gnuradio/doc/howto-write-a-block.html ?
There are always separate is_signatures for input and output
directions. Look at gr_io_signature.h for additional information.
gdb will tell you where you are segfaulting.
Eric
Thank you Eric,
But I still have a problem. I simply made two blocks.
-
First One
gr_data_parser::gr_data_parser ()
: gr_block (“gr_data_parser”,
gr_make_io_signature (1, 1, sizeof (gr_complex)),
gr_make_io_signature (1, 2, sizeof (gr_complex)))
-
Second One
gr_data_parser2::gr_data_parser2 ()
: gr_block (“gr_data_parser2”,
gr_make_io_signature (1, 2, sizeof (gr_complex)),
gr_make_io_signature (1, 1, sizeof (gr_complex)))
And I connect above two blocks in following way.
self.connect(self.u, … , data_parser, data_parser2 , … self. u);
I put a debug code in the function ‘general_work()’ of first function, I
just can have
output_items.size() = 1
The number of output stream of first block could not be changed. Is
there
any other point I should change?
Thanks in advance
Yong
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On Fri, Mar 06, 2009 at 05:22:44PM -0800, Yong J. Chang wrote:
I put a debug code in the function ‘general_work()’ of first function, I
just can have
output_items.size() = 1
That means that the block has a single output, not that the size of
the output item is 1 byte.
Eric