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Forum Topic - Img library - io_open(IO_MEM, IO_WRITE, ...): (3 Items)
   
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Andrzej Polanski
12/01/2017 5:28 AM
post118255
Img library - io_open(IO_MEM, IO_WRITE, ...)   
How to use io_open() for write into memory buffer?
Try like
   output = io_open(IO_MEM, IO_WRITE, (unsigned)BUF_SIZE, (void*)buf);
gives errno = ENOTSUP         48  /* Not supported (1003.1b-1993)   */
Is it possible?

Additional remark - documentation for image library is rather brief (e.g. not mentioned how to free memory allocated 
with img_load())
Derek Leach
12/01/2017 9:30 AM
post118256
RE: Img library - io_open(IO_MEM, IO_WRITE, ...)   
No, it is a read-only interface.  Only the IO_FD interface supports write functionality.

-----Original Message-----
From: Andrzej Polanski(deleted) [mailto:community-noreply@qnx.com] 
Sent: Friday, December 1, 2017 5:29 AM
To: advanced-graphics <advanced-graphics@community.qnx.com>
Subject: Img library - io_open(IO_MEM, IO_WRITE, ...)

How to use io_open() for write into memory buffer?
Try like
   output = io_open(IO_MEM, IO_WRITE, (unsigned)BUF_SIZE, (void*)buf);
gives errno = ENOTSUP         48  /* Not supported (1003.1b-1993)   */
Is it possible?

Additional remark - documentation for image library is rather brief (e.g. not mentioned how to free memory allocated 
with img_load())



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Andrzej Polanski
12/01/2017 10:40 AM
post118257
Re: RE: Img library - io_open(IO_MEM, IO_WRITE, ...)   
Thank you for fast response.

I would like to do it myself.
In particular - how to properly initialize 
struct _io_bstream {
	io_stream_t	stream;
	unsigned	flags;
	_uint8		*buf;
	unsigned 	bufsiz, buf_pos, buf_nleft;
	unsigned	pos, nleft;
	io_close_f	*close_f;
}
in my version of "io_open_f()"?
I have tried  but it does not work properly (perhaps flags or sizes not set properly).
Is there doc or example?

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