Boost Users :
Subject: Re: [Boost-users] [GIL] read/write jpeg image from/to a buffer, not a file
From: Christian Henning (chhenning_at_[hidden])
Date: 2018-07-25 19:14:02
On Wed, Jul 25, 2018 at 2:56 PM Mateusz Loskot via Boost-users <
> On 18 July 2018 at 15:05, FrÃ©dÃ©ric via Boost-users
> <boost-users_at_[hidden]> wrote:
> > Hi,
> > Is it possible to read/write an image as JPEG from/into a memory
> > buffer instead of a file?
I assume you mean using something like a stringstream as an in-memory
buffer. The test suite has some examples, like:
BOOST_AUTO_TEST_CASE( stream_test )
// 1. Read an image.
std::ifstream in( jpeg_filename.c_str(), ios::binary );
read_image( in, img, tag_t() );
// 2. Write image to in-memory buffer.
std::stringstream out_buffer( ios_base::in | ios_base::out |
write_view( out_buffer, view( img ), tag_t() );
// 3. Copy in-memory buffer to another.
std::stringstream in_buffer( ios_base::in | ios_base::out |
in_buffer << out_buffer.rdbuf();
// 4. Read in-memory buffer to gil image
read_image( in_buffer, dst, tag_t() );
// 5. Write out image.
std::string filename( jpeg_out + "stream_test.jpg" );
std::ofstream out( filename.c_str(), ios_base::binary );
write_view( out, view( dst ), tag_t() );
Does that help?
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