On Thu, Jul 21, 2022 at 11:53 PM Lorenzo Portillo <[email protected]>
wrote:
> Thanks for the answer.
>
> My code looks like this, but I get nothing on return.
> Am I missing something?
>
> C++
>
>> extern "C"
>> {
>> unsigned int const* convertStringToAscii(char* text)
>> {
>> std::string str(text);
>> unsigned int* ptr = (unsigned int*)malloc(str.size());
>>
>> for (int i = 0; i < str.size(); i++)
>> {
>> ptr[i] = int(text[i]);
>> }
>>
>> return ptr;
>> }
>> }
>
>
> Javascript
>
>> convertStringToAscii = module.cwrap('convertStringToAscii', 'string',
>> ['array'])
>> console.log(convertStringToAscii("test")) => return empty
>
>
The second argument to cwrap is the is the return type and the third
argument are the parameter types, so I think you want do some something
like `module.cwrap('convertStringToAscii', 'number', ['string'])`.
The return type of your function is a pointer which is just a number (an
offset into theheap).
> El vie, 22 jul 2022 a las 2:02, J Decker (<[email protected]>) escribió:
>
>> what you might get instead is returning a pointer to some array; which is
>> an integer, then using that integer to get a uint8array from the U8HEAP
>> variable, using the integer as the starting offset, and whatever length you
>> expect...
>>
>> all pointers to the heap in C/C++ are really just offsets...
>>
>> On Thu, Jul 21, 2022 at 5:04 PM Lorenzo Portillo <[email protected]>
>> wrote:
>>
>>> Someone has an example of how to implement a C++ function called from JS
>>> with cwrap, whose return type is a Uint8Array?
>>>
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