编译选项
emcc sum.cc -o sum.js -sEXPORTED_FUNCTIONS=_malloc,_free
sum.cc
#include "util.h" #include<stdlib.h> #include<string.h> #include <malloc.h> EM_PORT_API(int)sum(int*ptr,int count) { int total = 0; for (int i = 0; i < count; i++) { total += ptr[i]; } return total; }
js_alloc_mem.html
<html> <head> <title>test page</title> </head> <body> <script > Module={} Module.onRuntimeInitialized=function(){ var count = 50; var ptr = Module._malloc(count*4); console.log("sum 50"); for(var i=0;i<count;i++){ Module.HEAP32[ptr/4+i]=i+1; } console.log(Module._sum(ptr,count)); Module._free(ptr); } </script> <script src="sum.js"></script> </body> </html>
