quickjs调用C函数

QuickJS调用C函数，这个可以参考官方的std、os进行实现。

外部库

core.h

#include <string.h>
#include "quickjs-libc.h"
#include "cutils.h"

extern JSModuleDef *js_init_module_core(JSContext *ctx, const char *module_name);

core.c

#include "core.h"

static char version_build_string[32] = {0};
static void js_core_gen_version(){
  char s_month[5];
  int month, day, year;
  int hour, min, sec;

  static const char month_names[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
  sscanf(__DATE__, "%s %d %d", s_month, &day, &year);
  month = (strstr(month_names, s_month) - month_names) / 3 + 1;

  sscanf(__TIME__, "%d:%d:%d", &hour, &min, &sec);
  snprintf(version_build_string, sizeof(version_build_string), "%04d-%02d-%02dT%02d:%02d:%02dZ",
           year, month, day, hour, min, sec);
}
static JSValue js_core_read(JSContext *ctx, JSValueConst this_val,
                            int argc, JSValueConst *argv)
{
  return JS_NewString(ctx, version_build_string);
}
static JSValue js_core_write(JSContext *ctx, JSValueConst this_val,
                            int argc, JSValueConst *argv)
{
  const char * str = JS_ToCString(ctx, argv[0]);
  strcpy(version_build_string, str);
  return JS_NewString(ctx, version_build_string);
}

static const JSCFunctionListEntry js_core_functions[] = {
    JS_CFUNC_DEF("readVersion", 0, js_core_read),
    JS_CFUNC_DEF("writeVersion", 1, js_core_write),
    JS_PROP_STRING_DEF("version", version_build_string, JS_PROP_C_W_E),
};

static int js_core_init(JSContext *ctx, JSModuleDef *m)
{
  js_core_gen_version(); // generate version string
  return JS_SetModuleExportList(ctx, m, js_core_functions,
                                countof(js_core_functions));
}

JSModuleDef *js_init_module_core(JSContext *ctx, const char *module_name)
{
  JSModuleDef *m;
  m = JS_NewCModule(ctx, module_name, js_core_init);
  if (!m)
  {
    return NULL;
  }
  JS_AddModuleExportList(ctx, m, js_core_functions, countof(js_core_functions));
  return m;
}

test.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "quickjs-libc.h"
#include "core.h"

int main(int argc, char *argv[])
{
  printf("HELLO\n");

  JSRuntime *rt = JS_NewRuntime();
  js_std_init_handlers(rt);
  JSContext *ctx = JS_NewContext(rt);
  /* system modules */
  js_init_module_std(ctx, "std");
  js_init_module_os(ctx, "os");
  js_init_module_core(ctx, "core");
  
  const char *str =
      "import * as std from 'std';\n"
      "import * as os from 'os';\n"
      "globalThis.std = std;\n"
      "globalThis.os = os;\n"
      "var console = {};\n"
      "console.log = value => std.printf(value);\n"
      "";
  JSValue init_compile =
      JS_Eval(ctx, str, strlen(str), "<input>", JS_EVAL_TYPE_MODULE | JS_EVAL_FLAG_COMPILE_ONLY);

  js_module_set_import_meta(ctx, init_compile, 1, 1);
  JSValue init_run = JS_EvalFunction(ctx, init_compile);
  
  const char *test_val = R"(
    import * as core from 'core';
    var console = {};
    console.log = value => globalThis.std.printf(value + "\n");
    console.log(core.writeVersion("0.0.1"));
    console.log(core.readVersion());
    console.log("ver:" + core.version)
    var obj = {"a": 1,"b": 2,"c": 3}
    for(var key in obj){
      console.log("-->" + key + ":" + obj[key]);
    }
    var props = Object.keys(obj);
    console.log(props);

    os.setTimeout(()=>{std.printf('AAB\n')}, 2000)
  )";
  JSValue result = JS_Eval(ctx, test_val, strlen(test_val), "test", JS_EVAL_TYPE_MODULE);
  printf("loop\n");
  js_std_loop(ctx);

  printf("%s\n", __TIME__);
  int32_t len;
  int to_int_32;
  if ((to_int_32 = JS_ToInt32(ctx, &len, result)) != 0) {
    js_std_dump_error(ctx);
  }

  JS_FreeContext(ctx);
  JS_FreeRuntime(rt);
  return 0;
}

编译 Makefile

main: test.c 
        gcc test.c core.c libquickjs.a -o main.exe -I .

输出打印

HELLO
0.0.1
0.0.1
ver:2023-11-23T19:20:33Z
-->a:1
-->b:2
-->c:3
a,b,c
loop
AAB
19:20:33

 

 参考资料

　　https://github.com/quickjs-zh/QuickJS/blob/master/examples/fib.c

　　https://github.com/quickjs-zh/QuickJS/blob/master/tests/bjson.c

本文地址：https://www.cnblogs.com/wunaozai/p/17851826.html

系列目录：https://www.cnblogs.com/wunaozai/p/17853962.html