I am in the process of porting a crypto implementation to JS using
emscripten. The compilation of C++ code to js is pretty smooth. But I have
some issues in dealing the interaction of JS and compiled C++ code. I have
a few question and hope to get some advice from this list.
1. In recent releases uses fastcomp, and and it seems embind no longer
works. If I use 'extern "C"' to disable the c++ mangling, and use cwrap to
call c function from Js, it should work, right?
2. I personally prefer to use "embind", that allow me to expose C++ class
to JS directly. I will have to use 12.0 or earlier release. Is it a
recommended practice? Can I expect embind be supported again?
3. I need to pass ArrayBuffer from JS to compiled C++ code, and get back a
new (or modified) ArrayBuffer. It is not clear to me how can I do it. The
simplified code will be something like this:
class MyCrypto {
MyCryto();
void Process(const string& input, vector<string>& output);
};
EMSCRIPTEN_BINDINGS(MyCryptoModule) {
class_<MyCrypto>("MyCrypto").constructor()
.function("Process", &MyCrypto::Process);
register_vector<std::string>("VectorString");
}
This code compiled well. But I don't know how JS code can be written to
call function.
var crypto = new Module.MyCrypto();
crypto.Process(...);
I would like the input to be ArrayBuffer,
var input = new ArrayBuffer(256);
What will be the output look like? Will this work at all?
If std::vector brings trouble, I can give it up and change "output" to be
std::string.
void Process(const string& input, string& output);
Compiler will complain about this form.
error: non-const lvalue reference to type 'basic_string[[3 * ...]>' cannot
bind to a temporary of type 'basic_string[[3 * ...]>
Thanks in advance
lucoy
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