Send a file over XMLHttpRequest in pure QML?

Applications QML
#1

Anyone knows how to do that? There is an old thread from tjc that claims it’s impossible:
https://together.jolla.com/question/214496/how-to-send-a-file-using-xmlhttprequest/
but maybe it got read-only before an answer existed.
Thanks in advance

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#2

Forgive my ignorance, but what sort of handle do you have on the file?

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#3

It’s some nemo.picker or something like that, can you pass that to xhr?

#4

So basically just a path/name then? If it survives being read into a string (AFAIK the only file reading thing in QML is XMLHttpRequest, also for local files), you could relay the contents. But for things like images, i can’t help but think you might be out of luck, as per the previous answer. (But do test…)

Since XMLHttpRequest is from standard JavaScript, which is very browser-centric, i think passing arbitrary local files, referred to just by name, is not really in the cards.

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#5

You could read it byte by byte in JS? But not sure how to pass that over? As multipart/form-data with custom boundary? In theory should be possible?

#6

I’d assume that is exactly what lack of typed arrays trips up, but that is really a bit outside my knowledge.
However… that might be fake news, as they supposedly got included in Qt 5.5 What's New in Qt 5.5 | Qt 5.15

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#7

Yeeeah, I’ve no clue, I just tinker on my phone and was hoping there is a way to do a one-liner, this is way over my head, but if a simple JS function can read a file and pass it over QML, it seems like it would be all that’s needed (unless implemented in Qt 5.12, but 5.5 seems great)

#8

I think it basically goes as follows (if at all): send request for local file, read that out as typed array, re-ship that in request to remote server.

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#9

I really hate this part:

This example uses plain text, but you can imagine the data being a binary file instead.

I can imagine a lot of things, but just wanted a QML example of sending binary data with some text data on top and if we look at the beginning of the thread it’s impossible?

edit: oh wait, you probably meant the next part: sending typed arrays as binary data, nvm

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#10

Could also be that whatever the example from Receiving binary data in older browsers returns can go straight into the next request too.

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#11

Can you point the relevant part? It’s about GET request and has no relation to making a POST with binary?

#12

I’m thinking you want to do what their load_binary_resource() on your local file, then try to feed that returned value to the POST request.
If that doesn’t do it, try to figure out if reshaping that to a typed array helps.

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#13

Oh wait is xhr the only way for JS to interact with files within QML?

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#14

¯\_(ツ)_/¯  

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#16

You should be able to load a file with Canvas as binary and then reread it back with getImageData, maybe?

#17

add a bit of c++/qt code maybe?

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#18

Yeah, with python/C++ it gets easy, but it’s always lazy now vs recompiling for aarch128 later (or being ded by that time, btw holy shit glad you’re still around man)

#19

What happens if you just load an Image{}, can’t you read it’s values or like >> them out from .data? I’m really shit at QML

#20

Also pure QML code can be easily reviewed? I assumed that would be valued in the regions of the world this would be applicable to

#21

this is why CI/CD exists

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