从JavaScript调用C ++函数指针 [英] Call C++ function pointer from Javascript

问题描述

是否可以将函数指针从C ++（使用Emscripten编译为Javascript）传递到直接编写的JS？我已经找到了创建函数指针的JavaScript函数传递给C ++的方法，但不是一个方法暴露一个函数指针，在C ++代码的运行时，到Javascript。

Is it possible to pass function pointers from C++ (compiled into Javascript using Emscripten) to directly-written JS? I've found ways of creating function pointers of Javascript functions to pass to C++, but not a way of exposing a function pointer, given a value at runtime in C++ code, to Javascript.

代码范围，我接下来是能够完成下面的代码片段，以调用作为 cFunctionPointer 传递的函数 console.log

Code-wide, what I'm after is to be able to complete the code snippet below in order to call the function passed as cFunctionPointer where I'm doing the console.log

void passToJs(void (*cFunctionPointer)()) {
  EM_ASM_ARGS({
    // Prints out an integer. Would like to be able to
    // call the function it represents.
    console.log($0);
  }, cFunctionPointer);
}

推荐答案

在 http://stackoverflow.com/a/25584986/1319998 。您可以使用 Runtime.dynCall 函数：

void passToJs(void (*cFunctionPointer)()) {
  EM_ASM_ARGS({
    Module.Runtime.dynCall('v', $0, []);
  }, cFunctionPointer);
}

'v'

显然，它支持其他签名，例如'vii'，这是一个void函数，它接受2个整数参数。整数参数然后必须在 Runtime.dynCall 的第三个参数的数组中传递。

Apparently it supports other signatures, such as 'vii', which is a void function that takes 2 integer arguments. The integer arguments would then have to passed in the array which is the 3rd argument of Runtime.dynCall.

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