[英]How load an emscripten generated module in Vue.js in order to use its functions?
As you can read here: https://forum.vuejs.org/t/wasm-how-to-correctly-call-a-webassembly-method-in-vue-js/83422/24 I'm trying to figure out how to import a module generated by emscripten in Vue.js in order to call its methods.正如您可以在这里阅读的: https : //forum.vuejs.org/t/wasm-how-to-correctly-call-a-webassembly-method-in-vue-js/83422/24我想弄清楚如何在 Vue.js 中导入 emscripten 生成的模块以调用其方法。
Following the indications found here: How load an emscripten generated module with es6 import?按照此处找到的指示: How to load an emscripten generated module with es6 import? I compiled add.c with this command:
我用这个命令编译了 add.c:
emcc add.c -o js_plumbing.js -s EXPORTED_FUNCTIONS="['_Add']" -s
EXTRA_EXPORTED_RUNTIME_METHODS=['ccall','cwrap'] -s EXPORT_ES6=1 -s
MODULARIZE=1
and modified Result.vue accordingly in this way:并以这种方式相应地修改了 Result.vue:
<template>
<div>
<p button @click="callAdd">Add!</p>
<p>Result: {{ result }}</p>
</div>
</template>
<script>
import Module from './js_plumbing'
const mymod = Module();
export default {
data () {
return {
result: null
}
},
methods: {
callAdd() {
const result = mymod.cwrap('Add',
'number',
['number', 'number'],
[1, 2]);
this.result = result;
}
}
}
</script>
But I got this error:但我收到了这个错误:
Failed to compile.
./src/components/js_plumbing.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
SyntaxError: Unexpected token, expected ( (3:25)
1 |
2 | var Module = (function() {
> 3 | var _scriptDir = import.meta.url;
| ^
4 |
5 | return (
6 | function(Module) {
The only way I found to import emscripten generated Module and use its functions, is to use a sort of an "hack": manually adding 'export' keyword in the Module definition in js_plumbing_js, the javascript file generated by compiling add.c with:我发现导入 emscripten 生成的模块并使用其函数的唯一方法是使用一种“hack”:在 js_plumbing_js 的模块定义中手动添加“export”关键字,通过编译 add.c 生成的 javascript 文件:
emcc add.c -o js_plumbing.js -s EXTRA_EXPORTED_RUNTIME_METHODS=['ccall','cwrap'] -s
ENVIRONMENT='web','worker'
Result.vue :结果.vue:
<template>
<div>
<p button @click="callAdd">Add!</p>
<p>Result: {{ result }}</p>
</div>
</template>
<script>
import * as js_plumbing from './js_plumbing'
import Module from './js_plumbing'
export default {
data () {
return {
result: null
}
},
methods: {
callAdd () {
const result = js_plumbing.Module.ccall('Add',
'number',
['number', 'number'],
[1, 2]);
this.result = result;
}
}
}
</script>
js_plumbing.js : js_plumbing.js :
// Copyright 2010 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
// The Module object: Our interface to the outside world. We import
// and export values on it. There are various ways Module can be used:
// 1. Not defined. We create it here
// 2. A function parameter, function(Module) { ..generated code.. }
// 3. pre-run appended it, var Module = {}; ..generated code..
// 4. External script tag defines var Module.
// We need to check if Module already exists (e.g. case 3 above).
// Substitution will be replaced with actual code on later stage of the build,
// this way Closure Compiler will not mangle it (e.g. case 4. above).
// Note that if you want to run closure, and also to use Module
// after the generated code, you will need to define var Module = {};
// before the code. Then that object will be used in the code, and you
// can continue to use Module afterwards as well.
export var Module = typeof Module !== 'undefined' ? Module : {};
But, as I said, I do not like this manual hack.但是,正如我所说,我不喜欢这种手动破解。 Any suggestions on how to make the Module exportable, thus importable, without manually adding 'export' in js_plumbing.js file?
关于如何使模块可导出,从而可导入,而无需在 js_plumbing.js 文件中手动添加“导出”的任何建议?
1° Update) 1°更新)
Following the indications of the answer here: How to call a webassembly method in vue.js?遵循此处的答案指示: How to call a webassembly method in vue.js?
I compiled the add.c file in this way:我是这样编译add.c文件的:
emcc add.c -o js_plumbing.js -s MODULARIZE=1
and then modified Result.vue as follows:然后修改Result.vue如下:
<template>
<div>
<p button @click="callAdd">Add!</p>
<p>Result: {{ result }}</p>
</div>
</template>
<script>
import Module from './js_plumbing'
export default {
data () {
return {
result: null
}
},
methods: {
callAdd() {
const instance = Module({
onRuntimeInitialized() {
console.log(instance._Add(1,2));
this.result = instance._Add(1,2);
}
})
}
}
}
</script>
There must be something I'm doing wrong, since I do get the console.log when clicking to the Add!一定是我做错了什么,因为我在点击添加时得到了 console.log! button,but the output is not transferred to the the html part of Result.vue:
按钮,但输出不会传输到 Result.vue 的 html 部分:
import Module from './js_plumbing';
let instance = {
ready: new Promise(resolve => {
Module({
onRuntimeInitialized () {
instance = Object.assign(this, {
ready: Promise.resolve()
});
resolve();
}
});
})
};
export default {
data () {
return {
result: null
};
},
methods: {
callAdd(a, b) {
instance.ready
.then(_ => this.result = instance._Add(a, b));
}
}
};
《WebAssembly in action》一书的作者 Gerard Gallant 找到了另一个很好的解决方案: https : //github.com/emscripten-core/emscripten/issues/10114
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