Hi there, I solve the first problem, and found a work-around the second
On 28/12/2020 01:06, Hanns Holger Rutz wrote:
[...]
> And here is a JS snippet I will add as post-js:
It seems that `--post-js` not necessarily runs after the module is
initialized. So that code must be wrapped in `addOnPostRun`, like so:
```javascript
addOnPostRun(function() {
console.log("here: 1");
var instance = new Module.MyClass(10, "hello");
instance.incrementX();
var x1 = instance.x; // 11
console.log("x is now: " + x1);
instance.x = 20; // 20
var s = Module.MyClass.getStringFromInstance(instance); // "hello"
console.log("string is now: " + s);
instance.delete();
console.log("here: 2");
});
```
(see https://github.com/emscripten-core/emscripten/issues/13116)
[...]
> The next step will be for me that I need to call instance methods from
> JavaScript on an instance created from within C++ itself. How would I
> pass an instance to JavaScript?
I haven't solved passing an actual instance, but in my case I will only
ever have _one_ instance of the class. In this case, one can use a
singleton-pattern as described here:
https://groups.google.com/g/emscripten-discuss/c/MimQol7peuQ
Ex:
```cpp
#include <emscripten/bind.h>
#include <emscripten.h>
class MyClass {
public:
MyClass() {}
void doSomething() {
printf("Doing something\n");
}
};
static MyClass* singleton_val;
MyClass* singleton() {
if (singleton_val == NULL) {
singleton_val = new MyClass;
}
return singleton_val;
}
EMSCRIPTEN_BINDINGS(my_module) {
emscripten::class_<MyClass>("MyClass")
.function("doSomething", &MyClass::doSomething);
function("singleton", &singleton, emscripten::allow_raw_pointers());
}
int main() {
EM_ASM({
Module.singleton().doSomething();
});
return 0;
}
```
Best, .h.h.
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