如何从javascript访问Emscripten类型的数组? [英] How do I access the Emscripten typed array from javascript?

问题描述

我已经使用Emscripten将C库编译为javascript代码.但是，当我尝试将其与Javascript包装器绑定时遇到问题.

I had compiled a C lib into javascript code by using Emscripten. However I ran into a problem when I try to bind it with my Javascript wrapper.

我编写此代码是为了通过引用传递它，我可以通过编译的lib访问它.

I wrote this to pass it by reference, I am able to access it via the compiled lib just fine.

var str_to_heapu8 = function (str) {
    return allocate(intArrayFromString(str), 'i8', ALLOC_NORMAL);
}

但是，我在将其恢复为普通的javascript字符串时遇到了麻烦...返回值是一个空字符串.

However, I have trouble retrieving it back to normal javascript string... the return value is an empty string.

var heapu8_to_str = function (ptr, len){
    var array = new Uint8Array(len);
    var i = 0;

    while( (ptr+i) < len){
        array[i] = getValue(ptr+i, 'i8');
        i++;
    }

    return intArrayToString(array);
}

如何将其转换回javascript字符串?e

How can I convert it back to javascript string?e

推荐答案

这对我有用:

var heapu8_to_str = function (ptr, len){
    return intArrayToString(HEAPU8.subarray(ptr, ptr+len));
};

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