What is the best way to retrieve the js window object within emscripten's EM_JS function?

I'm looking to access the window.location in an EM_JS method in order to call a JavaScript method from C++.

My attempted approach was:

EM_JS(const char*, getlocation, (), {
    let location = window.location;
    let length = lengthBytesUTF8(location) + 1;
    let str = _malloc(length);
    stringToUTF8(location, str, length);
    return str;
});

However, I'm encountering this error:

ReferenceError: window is not defined

Is there an alternative method to retrieve window.location in C++ code compiled with Emscripten without passing the value through the C++ API using ccall or cwrap?

Answer №1

After some testing, I found that the code mentioned in the question functions perfectly. The only issue is that it needs to be executed after the main content has finished loading.

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