编译选项
emcc mem.cc -o mem.js
mem.cc
#include "util.h"
int g_int=42;
double g_double = 3.1415926;
EM_PORT_API(int*)get_int_ptr(){
return &g_int;
}
EM_PORT_API(double*)get_double_ptr()
{
return &g_double;
}
EM_PORT_API(void)print_data(){
printf("C{g_int:%d}\n",g_int);
printf("C{g_double:%lf}\n",g_double);
}
mem.html
<html>
<head></head>
<body>
<script>
Module={}
Module.onRuntimeInitialized = function(){
var int_ptr = Module._get_int_ptr();
var int_value = Module.HEAP32[int_ptr>>2];
console.log("JS{int_value:"+int_value+"}");
var double_ptr = Module._get_double_ptr();
var double_value = Module.HEAPF64[double_ptr>>3];
console.log("JS{double_value:"+double_value+"}");
Module.HEAP32[int_ptr>>2] = 13;
Module.HEAPF64[double_ptr>>3]=123456.3789;
Module._print_data();
}
</script>
<script src="mem.js"></script>
</body>
</html>
运行命令
emrun --no_browser --port 8000 mem.html
运行效果图
简要说明
操作内存是需要字节对齐 这也是上面js代码中右移2 位和3位的原因具体请参照
https://www.cntofu.com/book/150/zh/ch2-c-js/ch2-03-mem-model.md
Module.HEAPX
Emscripten 已经位Module.buffer创建了常用的类型
标签：value,--,double,JavaScript,Module,int,C++,mem,ptr From： https://www.cnblogs.com/simp/p/16783789.html