Created
December 30, 2017 10:52
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$emacs libtest.c | |
#include <math.h> | |
#include <string.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
// | |
// int | |
int int_sqrt(int x) { | |
return sqrt(x); | |
} | |
// | |
// string | |
char* chars_hello(char* src) { | |
return strcat( "Hello ", src ); | |
} | |
// | |
// pointer | |
typedef struct { | |
char* name; | |
} Hello; | |
Hello* new_hello(char *name, int length) { | |
Hello *obj = (Hello*)calloc(1, sizeof(Hello)); | |
obj->name = (char*)calloc(1, sizeof(char)*(length+1)); | |
for(int i=0;i<length;i++) { | |
obj->name[i] = name[i]; | |
} | |
return obj; | |
} | |
char* hello_getName(Hello* obj) { | |
return obj->name; | |
} | |
void free_hello(Hello* obj) { | |
if(obj == NULL) { | |
return; | |
} | |
free(obj->name); | |
free(obj); | |
} | |
$ emcc libtest.c -o libtest.js -s EXPORTED_FUNCTIONS='["_int_sqrt","_chars_hello", "_new_hello","_hello_getName", "_hello_getName", "_free_hello"]' -s EXTRA_EXPORTED_RUNTIME_METHODS='["ccall", "cwrap"]' | |
$ emacs main.html | |
<html> | |
<head> | |
<title></title> | |
</head> | |
<body> | |
<script src="libtest.js"></script> | |
<script> | |
// | |
// int | |
int_sqrt = Module.cwrap('int_sqrt', 'number', ['number']); | |
console.log("#int_sqrt : "+int_sqrt(12)); | |
// | |
// string | |
chars_hello = Module.cwrap('chars_hello', 'string', ['string']); | |
console.log("#chars_hello : " + chars_hello('test')); | |
// | |
// uint8array | |
helloArray = []; | |
helloSrc = "hello"; | |
for(i=0;i<helloSrc.length;i++){ | |
helloArray.push(helloSrc.charCodeAt(i)); | |
} | |
hello = chars_hello(new Uint8Array('helloArray')); | |
console.log("#chars_hello : " + hello); | |
// | |
// pointer | |
new_hello = Module.cwrap('new_hello', 'number', ['string', 'number']); | |
hello_getName = Module.cwrap('hello_getName', 'string', ['number']); | |
free_hello = Module.cwrap('free_hello', '', ['number']); | |
helloObj = new_hello("test", 4); | |
console.log("#pointer:" + hello_getName(helloObj)); | |
free_hello(helloObj); | |
</script> | |
</body> | |
</html> | |
$ python -m SimpleHTTPServer | |
Serving HTTP on 0.0.0.0 port 8000 ... | |
$ open http://0.0.0.0:8000/ | |
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