Calling C++ function from JavaScript through Webassembly

[AliGB]

I need to call a function in my Qt program (C++) from JavaScript but I don't know how Qt calls C++ functions from JS.

Using this does not work since Qt does not export ccall.

var result = Module.ccall(
            'myFunction',	// name of C function
            null,	// return type
            null,	// argument types
            null	// arguments );

How can I do this?

[lorn.potter]

You need to export those by adding linker arguments:

https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html#interacting-with-code-ccall-cwrap