Hi, That’s great! Thank you a lot for the information :-)
Juraj > On Apr 27, 2017, at 09:52, Sven Van Caekenberghe <s...@stfx.eu> wrote: > > >> On 26 Apr 2017, at 17:21, Peter Uhnak <i.uh...@gmail.com> wrote: >> >> Maybe the content is not properly stored in the JSON on github' side? But >> you can use base64 in `accept:` to make it work. >> >> json := STONJSON fromString: (ZnClient new >> url: 'https://api.github.com/gists/5503544'; >> accept: 'application/vnd.github.v3.base64+json'; >> get). >> b64 := ((json at: 'files') at: 'thumbnail.png') at: 'content'. >> PNGReadWriter formFromStream: (Base64MimeConverter mimeDecodeToBytes: >> content readStream). > > Ah, great that you found a way to force the server to send the data in a more > sensible way ! > > Using the latest code from Zn & NeoJSON, combining with another recent thread > (accessing nested dictionaries), this could be written as: > > json := NeoJSONObject fromString: (ZnClient new > url: 'https://api.github.com/gists/5503544'; > accept: 'application/vnd.github.v3.base64+json'; > get). > b64 := json atPath: #('files' 'thumbnail.png' 'content'). > PNGReadWriter formFromStream: (ZnBase64Encoder new decode: b64) readStream. > > Sven > >> Peter >> >> >> On Wed, Apr 26, 2017 at 04:50:04PM +0200, Sven Van Caekenberghe wrote: >>> I am puzzled by how they actually encoded the PNG as a String, I tried a >>> couple of alternatives but I could not get binary data out of it so that it >>> parsed successfully as PNG. >>> >>> If I would have to encode binary data in JSON I would use Base64 encoding >>> (but alternatives exist). >>> >>>> On 24 Apr 2017, at 20:36, Juraj Kubelka <juraj.kube...@icloud.com> wrote: >>>> >>>> Hi, >>>> >>>> I was playing with GitHub Gist API and I have queried the following Gist: >>>> https://gist.github.com/mbostock/5503544 >>>> I was interested how the PNG image is returned: >>>> https://gist.github.com/mbostock/5503544#file-thumbnail-png >>>> >>>> I can obtain the whole Gist executing: >>>> >>>> STONJSON fromString: >>>> (ZnClient new >>>> url: 'https://api.github.com/gists/5503544'; >>>> accept: 'application/vnd.github.v3+json'; >>>> get). >>>> >>>> I can get PNG contents executing: >>>> >>>> pngData := (ZnEasy get: >>>> ((((STONJSON fromString: >>>> (ZnClient new >>>> url: 'https://api.github.com/gists/5503544'; >>>> accept: 'application/vnd.github.v3+json'; >>>> get)) at: 'files') at: 'thumbnail.png') at: 'raw_url')) >>>> contents. >>>> PNGReadWriter formFromStream: rawPng readStream. >>>> >>>> But the PNG image is part of the Gist query and can be retrieved by: >>>> >>>> pngContent := ((((STONJSON fromString: >>>> (ZnClient new >>>> url: 'https://api.github.com/gists/5503544'; >>>> accept: 'application/vnd.github.v3+json'; >>>> get)) at: 'files') at: 'thumbnail.png') at: 'content'). >>>> >>>> "As pngContent is a WideString, I cannot use:" >>>> PNGReadWriter formFromStream: pngContent readStream. >>>> >>>> How can I read the PNG image from the pngContent? Any idea? >>>> And the reverse question: How can I send the PNG bytes using JSON format? >>>> >>>> Thanks! >>>> Juraj >>>> >>> >>> >> > >
