ref-napi | Turn Buffer instances into pointers
kandi X-RAY | ref-napi Summary
kandi X-RAY | ref-napi Summary
[Dependency Status] This module is inspired by the old Pointer class from node-ffi, but with the intent of using Node’s fast Buffer instances instead of a slow C++ Pointer class. These two concepts were previously very similar, but now this module brings over the functionality that Pointers had and Buffers are missing, so now Buffers are a lot more powerful.
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QUESTION
Need to use some ffi napi in electron, and i trying to get it work, starting from small. Trying to understand and get ffi works, but cant get result. I know that i pass pointer to struct, into which the result will be written. But call return True and no result in the specified pointer. There is no new data. Please help with this.
...ANSWER
Answered 2021-Oct-24 at 06:52First, I don't know the pointer well. However, I was interested in the same problem, so I tried and found a solution. I will revise it when I know the exact principle.
The GetWindowRect and SHAppBarMessage functions you used receive struct pointer type parameters from C++. These functions have the function of notifying the successful or not by the return value and recording the data on the received struct. So, when testing the function in C++, an error occurs when building a structure type parameter without adding the Ampsand(ex. &rect or &data) symbol.
An example of ref-struct-di shows an example of using a struct pointer to a parameter. I thought this was delivering a struct pointer to a function and it worked when the code was modified as follows. The part that uses struct as a parameter and the part that defines the function with ffi must be modified. Please refer to the comments in code!
QUESTION
I'm relatively new to Spectron and Jest and I can't figure out why the app isn't launching when I call app.start() in my unit test. Right now when I run npm test, the app won't start, eventually times out (even after 30 seconds) and always sends this error message:
Timeout - Async callback was not invoked within the 15000 ms timeout specified by jest.setTimeout.Error: Timeout - Async callback was not invoked within the 15000 ms timeout specified by jest.setTimeout. at mapper (node_modules/jest-jasmine2/build/queueRunner.js:27:45)
So far I've tried:
- making sure I'm using the correct versions of spectron and electron (11.0.0 and 9.0.0 respectively)
- running npm test from my root folder, my src folder, and my tests folder.
- deleting my node_modules folder, reinstalling everything, and rebuilding the app.
- using
path.join(__dirname, '../../', 'node_modules', '.bin', 'electron')as my app.path.
Here's my test1.js file:
...ANSWER
Answered 2021-Sep-08 at 20:05I came across this Spectron tutorial on YouTube: https://www.youtube.com/watch?v=srBKdQT51UQ
It was published in September 2020 (almost a year ago as of the time of this post) and they suggested downgrading to electron 8.0.0 and Spectron 10.0.0. When I downgraded, the app magically launched when app.start was called.
QUESTION
I'm working on an electron app, using React on the front end and I'm attempting to use Jest for testing. However, when I try to run tests I get the following error:
SyntaxError: C:\Users\JimArmbruster\source\repos\cyborg_cloud_explorer\cyborg_cloud_explorer_gui\src\assets\custom_components\stylesheets\buttons.css: Support for the experimental syntax 'decorators-legacy' isn't currently enabled (1:1):
...ANSWER
Answered 2021-Sep-07 at 18:34Jest won't use the babel plugins out of the box, you need to install some additional packages.
With yarn:
yarn add --dev babel-jest babel-core regenerator-runtime
With npm:
npm install babel-jest babel-core regenerator-runtime --save-dev
Jest should then pick up the configuration from your .babelrc or babel.config.js.
Source: https://archive.jestjs.io/docs/en/23.x/getting-started.html#using-babel
QUESTION
I am trying to return a struct from a Rust function to Node.js, the struct is nested, and contains an array so it is sufficiently complicated that I want to do the allocation in Rust and have Node.JS receive a complete object, here's the Rust code in short:
A State is returned that contains a number of Configs, a message (e.g error message, or some warning) and a number of configs.
ANSWER
Answered 2021-Apr-26 at 07:56and contains an array so it is sufficiently complicated that I want to do the allocation in Rust and have Node.JS receive a complete object,
Containing an array was the tricky/trap part. Arrays in C (ergo FFI) tend to be zero terminated, but there's no guarantee that things work a particular way for arrays of structs.
Here's what we had to do:
- In Rust, expose a struct with a length member, and a pointer to a single item.
- In Rust, allocate a vector of our things and use
into_boxed_slice()to forget it, this gives a pointer to the first one. - Fill the length property on our struct
Everything like in the example we posted first.
In node.js however it's a bit different, the working code was nearly identical to what we had, here's the types:
QUESTION
I can get the correct native memory address if I use Node.js directly such as:
ANSWER
Answered 2020-Mar-19 at 16:46I got the answer for this case. In posted situation, I used nodeIntegration: true then I implemented the example used const remote = window.require('electron').remote and remote.require features. Then, AddressForArgs(†1) via ref.HexAddress returns electron client based address maybe ( I don't know more internals of the node-ref-napi, node-ffi-napi and electron just now ).
Therefore, I tried change to nodeIntegration: false setting with preload features.
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