Forked from ingride/gist:7bb61483127d1f6d85a35d772b589090
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May 8, 2021 21:00
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Return a String from C++ to WASM
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| // C++ bit . save it in an example.cpp file | |
| #include "emscripten.h" | |
| extern "C" { | |
| inline const char* cstr(const std::string& message) { | |
| char * cstr = new char [message.length()+1]; | |
| std::strcpy (cstr, message.c_str()); | |
| return cstr; | |
| } | |
| EMSCRIPTEN_KEEPALIVE | |
| const char* getAMessage() { | |
| return cstr("oh hai there!"); | |
| }; | |
| } | |
| //create the HTML / JS bit | |
| <script src="./a.out.js"></script> | |
| <script> | |
| Module.onRuntimeInitialized = async _ => { | |
| const api = { | |
| message: Module.cwrap('getAMessage', 'string', []), | |
| }; | |
| console.log(api.message()); | |
| }; | |
| </script> | |
| // compile with | |
| emcc -s EXTRA_EXPORTED_RUNTIME_METHODS='["cwrap"]' -std=c++11 example.cpp |
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