So I figured out that Module was not defined.
And after a lot of failed examples, found this code that works...
<script type="module">
import Module from '../cpp/sqrt2/example.js'
Module().then(function(mymod) {
console.log("Module Loaded")
const int_sqrt = mymod.cwrap('int_sqrt', 'number', ['number']);
console.log(int_sqrt(64));
});
</script>
when compiled with:
emcc example.cpp -o example.js -s EXPORTED_FUNCTIONS="['_int_sqrt']" -s
EXPORTED_RUNTIME_METHODS="['ccall', 'cwrap']" -s EXPORT_ES6=1 -s
MODULARIZE=1
Now I just need to figure out how to split it up.
I want the call to int_sqrt to be callable from a javascript function
Thanks
On Friday, July 2, 2021 at 3:21:28 PM UTC-6 Gary Stuart wrote:
> Okay, so I took an example:
>
> #include <math.h>
> extern "C" {
> int int_sqrt(int x) {
> return sqrt(x);
> }
> }
>
> and put it in the file hello_function.cpp
>
> I ran their command, in an emcmdprompt, and it produced errors:
> emcc hello_function.cpp -o function.html -s
> EXPORTED_FUNCTIONS='["_int_sqrt"]'
> -s EXPORTED_RUNTIME_METHODS='["ccall","cwrap"]'
>
> I found that swapping the double and single quotes solved that problem:
> emcc hello_function.cpp -o function.html -s
> EXPORTED_FUNCTIONS="['_int_sqrt']" -s
> EXPORTED_RUNTIME_METHODS="['ccall','cwrap']"
>
> I put this line in the html file:
> <script type="text/javascript" src="/cpp/sqrt/function.js"></script>
>
> When I load the html file I get lots of errors:
> Uncaught (in promise) TypeError: Cannot read property 'apply' of undefined
> at Module._emscripten_stack_init (function.js:1832)
> at stackCheckInit (function.js:2104)
> at run (function.js:2116)
> at runCaller (function.js:2095)
> at removeRunDependency (function.js:1451)
> at receiveInstance (factorial.js:1)
> at receiveInstantiationResult (factorial.js:1)
>
> Module._emscripten_stack_init @ function.js:1832
> stackCheckInit @ function.js:2104
> run @ function.js:2116
> runCaller @ function.js:2095
> removeRunDependency @ function.js:1451
> receiveInstance @ factorial.js:1
> receiveInstantiationResult @ factorial.js:1
> function.js:1477 Uncaught (in promise) RuntimeError: abort(Assertion
> failed: undefined) at Error
> at jsStackTrace (function.js:1755)
> at stackTrace (function.js:1772)
> at abort (function.js:1471)
> at assert (function.js:678)
> at removeRunDependency (function.js:1438)
> at receiveInstance (function.js:1630)
> at receiveInstantiationResult (function.js:1647)
> at abort (function.js:1477)
> at assert (function.js:678)
> at removeRunDependency (function.js:1438)
> at receiveInstance (function.js:1630)
> at receiveInstantiationResult (function.js:1647)
>
>
> As to setup `Module['onRuntimeInitialized']` early on
> I'm not sure of the proper syntax. I tried
>
> <script>
> Module['onRuntimeInitialized'] = onRuntimeInitializedFactorial;
> </script>
>
> and I get the error:
> Uncaught ReferenceError: Module is not defined
>
> I feel like I'm missing something really basic that the rest of you just
> take for granted....
>
> I look forward to more clarification
>
> On Friday, July 2, 2021 at 2:53:15 PM UTC-6 [email protected] wrote:
>
>> 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
>>>>
>>>>
>>>>
>>>>
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