将Javascript函数添加到全局范围

I have an emscripten application. I have a javascript file that has a function definition. I load that file into a string and then call emscripten_run_script on it. Then, I try to call that function later using some inline EM_ASM call, but it says the function definition can't be found.

我有一个emscripten应用程序。我有一个具有函数定义的javascript文件。我将该文件加载到一个字符串中，然后在其上调用emscripten_run_script。然后，我尝试稍后使用一些内联EM_ASM调用来调用该函数，但它说无法找到函数定义。

    std::ifstream file("script.js"); // script.js has "someFunc" defined
    std::string str((std::istreambuf_iterator<char>(file)),
                     std::istreambuf_iterator<char>());

    emscripten_run_script( str.c_str() );

     // the below give error "someFunc not defined"
     EM_ASM({
        someFunc();
    });

However, if I load that javascript file into a string and then append the string with the call to the function

但是，如果我将该javascript文件加载到字符串中，然后附加调用该函数的字符串

    std::ifstream file("script.js"); // script.js has "someFunc" defined
    std::string str((std::istreambuf_iterator<char>(file)),
                     std::istreambuf_iterator<char>());

    auto combinedStr = str + "someFunc();";

    emscripten_run_script( combinedStr.c_str() ); // works fine

How can I add a javascript function defined in a file to global scope to be used later on?

如何将文件中定义的javascript函数添加到全局范围以供以后使用？

The javascript file looks like this:

javascript文件如下所示：

function someFunc()
{
}

1 个解决方案

#1

In tests I've done this seems to work, which should be equivalent to what you've done:

在我做过的测试中，这似乎有效，这应该等同于你所做的：

#include <stdio.h>
#include <emscripten.h>

int main()
{
    char script[] = "someFunc = function() {"
                    "console.log(\"hello\");"
                    "};";

    emscripten_run_script(script);

    EM_ASM({
        someFunc();
    });
}

Is your script.js declaring the function to be local in scope (via var someFunc = function(){...}; or somesuch)? emscripten_run_script isn't exactly like JavaScripts eval and local variables only exist within the scope of emscripten_run_script.

你的script.js是否声明函数在范围内是本地的（通过var someFunc = function（）{...};或者某些东西）？ emscripten_run_script与JavaScripts eval不完全相同，局部变量仅存在于emscripten_run_script的范围内。