SpiderMonkey js中调用c程序

原理: 通过JS_DefineFunctions函数, 向js注册函数.

1.添加头文件, 并定义宏

#include 
#include 
#include 
#include 

#define LOG_MINARGS 0

2.定义一个c函数

JSBool logging(JSContext *ConText, JSObject *object, uintN argc, jsval *argv, jsval *value)
{
    JSString *jss;
    int i = 0;

    for(i=0; i

3.定义一个函数表

JSFunctionSpec Functions[] = {
    {"logging", logging, LOG_MINARGS, 0, 0},
    {0,0,0,0,0}
};

4.添加主函数

int main(int argc, char **argv)
{
    JSRuntime *RunTime = NULL;
    JSContext *ConText = NULL;
    JSObject *Global = NULL;
    jsval rval;
    const char *Script;

    if(argc != 2)
    {
        printf("入参个数错误\n");
        return 0;
    }

    Script = argv[1];

    printf("script is \"%s\"\n", Script);

    if(!(RunTime = JS_NewRuntime(1024L * 1024L)) || !(ConText = JS_NewContext(RunTime, 8192)) || !(Global = JS_NewObject(ConText, NULL, NULL, NULL)))
    {
        return EXIT_FAILURE;
    }

    if(!JS_InitStandardClasses(ConText, Global))
    {
        return EXIT_FAILURE;
    }

    //向javascript中注册函数
    if(!JS_DefineFunctions(ConText, Global, Functions))
    {
        return EXIT_FAILURE;
    }

    if(!JS_EvaluateScript(ConText, Global, Script, strlen(Script), "script", 1, &rval))
    {
        return EXIT_FAILURE;
    }

    printf("the script's result is %d\n", JSVAL_TO_INT(rval));

    JS_DestroyContext(ConText);
    JS_DestroyRuntime(RunTime);
    JS_ShutDown();

    return EXIT_SUCCESS;
}

5.编译代码

gcc -o examle examle.c -L$HOME/local/normal/lib -ljs

6.运行程序

./examle "var a=6; var b=11; function add(a,b){return a+b}; console={}; console.log=logging; console.log(a,b,add(a,b)); add(a,b)"

7.执行结果

script is "var a=6; var b=11; function add(a,b){return a+b}; console={}; console.log=logging; console.log(a,b,add(a,b)); add(a,b)"
message: 6
message: 11
message: 17
the script's result is 17