Also, I believe you need to setup `Module['onRuntimeInitialized']` early on, like at the top level of your script, preferably even before the module JS file is imported. IIUC, you need to make sure you register this callback before the module is actually initialized, otherwise it might never be called.
On Fri, Jul 2, 2021 at 1:05 PM Alon Zakai <[email protected]> wrote: > To use cwrap(), you must export it. See > > https://emscripten.org/docs/api_reference/preamble.js.html?highlight=cwrap > > You can also run an example from the tutorial, which I verified now, > > > https://emscripten.org/docs/porting/connecting_cpp_and_javascript/Interacting-with-code.html?highlight=cwrap#interacting-with-an-api-written-in-c-c-from-nodejs > > It does have one typo which I'll fix now, the require should be of > "api_example.js". > > On Fri, Jul 2, 2021 at 11:25 AM Gary Stuart <[email protected]> > wrote: > >> Hi, >> >> I am trying to use emscripten on Windows 10. >> I have an existing Javascript client application that works. >> I want to connect in c++ code, and be able to call those c++ functions >> when needed. >> I have spent 1.5 days and can't even make a simple example work. >> >> I am using emcc version: 2.0.25 (Online the latest version seems to be >> 2.0.21???) >> I am using Chrome >> >> My example: >> function factorial() >> { >> console.log("MT:F") >> Module.onRuntimeInitialized = _ => { >> console.log("A") >> >> const factorialCpp = Module.cwrap('factorial', 'number', >> ['number']); >> console.log(factorialCpp) >> var result = factorialCpp(10); >> console.log(result) >> }; >> console.log("MT:F-E") >> } >> >> When I call this function, I get only the "MT:F" and "MT:F-E", and no >> errors in browser console. >> >> My compile line: >> emcc -O3 -s WASM=1 -s EXPORTED_RUNTIME_METHODS='["cwrap"]' -s >> EXPORTED_FUNCTIONS="['_factorial']" factorial.cpp factorial-service.cpp -o >> factorial.js >> >> If optimization is -O0, it complains about the cwrap export >> >> I have also tried: >> function factorial2() >> { >> Module['onRuntimeInitialized'] = onRuntimeInitializedFactorial; >> const factorialCpp = Module.cwrap('factorial', 'number', ['number']); >> >> function onRuntimeInitializedFactorial() >> { >> console.log("MT:F") >> console.log("A") >> var result = factorialCpp(10); >> console.log(result) >> console.log("MT:F-E") >> } >> } >> >> and: >> function factorial3() >> { >> var factorialCpp = Module.cwrap("factorial", "number", ["number"]); >> var result = factorialCpp(10); >> } >> >> Both produce an error: Uncaught TypeError: Module.cwrap is not a function >> >> I have found over 20 examples, that say just do this or that, but nothing >> works. >> Maybe my environment has a config issue? >> >> I would appreciate any any guidance on this. >> Thanks, >> Gary >> >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/emscripten-discuss/56840ae5-46b1-458d-b30f-27ee5433fd39n%40googlegroups.com >> <https://groups.google.com/d/msgid/emscripten-discuss/56840ae5-46b1-458d-b30f-27ee5433fd39n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "emscripten-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/CAEX4NpQ21Yoyvy_xzrLkBTWmvEQoyVWc0fG3kAMmgx%3DmrhxE9g%40mail.gmail.com > <https://groups.google.com/d/msgid/emscripten-discuss/CAEX4NpQ21Yoyvy_xzrLkBTWmvEQoyVWc0fG3kAMmgx%3DmrhxE9g%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/emscripten-discuss/CAL_va28AYfQ8Z180x31dX8s6ZkNzB6wVwYL_HJ7tgNE2vvi66w%40mail.gmail.com.
