WebAssembly 导出c结构体 js获取

c代码

#include <stdio.h>
#include <emscripten/emscripten.h>
typedef struct 
{
   int32_t number; 
   double d; 
   uint8_t* s;

}obj;

obj g = {1245,25.123456,(uint8_t*)"123456"};
uint8_t * EMSCRIPTEN_KEEPALIVE getStr(){
    return (uint8_t *)"hello world";
}
obj* EMSCRIPTEN_KEEPALIVE getObj(){
    return &g;
}

emscripten编译命令

emcc main.c -s EXTRA_EXPORTED_RUNTIME_METHODS=["UTF8ToString","getValue"] -s WASM=1  -s MODULARIZE=1  -s EXPORT_NAME="WasmModule" -s ENVIRONMENT=web -o index.js 

调用代码

WasmModule().then(mod => {
            //获取c字符串
            let strPtr = mod._getStr();
            //c字符串转换为js字符串
            console.log("_getStr 返回值",mod.UTF8ToString(strPtr));

            //获取结构体
            let obj = mod._getObj();
            // int32_t number; 
            console.log("int32_t number",mod.HEAP32[obj >> 2])
            //double d; 
            console.log("double d",mod.HEAPF64[(obj + 12) >> 3]);
            //uint8_t* s;
            console.log("uint8_t* s",mod.UTF8ToString(obj - 24));

        })

输出