Google V8編程詳解附錄

Google V8編程詳工具函數

頭文件：utils.h

 

#ifndef UTILS_H_
#define UTILS_H_
#include "v8.h"
#include <iostream>
using namespace v8;
using namespace std;

v8::Handle<v8::String> ReadJS(const char* name);
void printValue(Handle<Value> result);
#endif

 

 

• ReadJS

v8::Handle<v8::String> ReadJS(const char* name) {

        FILE* file = fopen(name, "rb");

        if (file == NULL) {
                return v8::Handle<v8::String>();
        }

        fseek(file, 0, SEEK_END);
        int size = ftell(file);
        rewind(file);

        char* chars = new char[size + 1];
        chars[size] = '\0';

        for (int i = 0; i < size;) {
                int read = fread(&chars[i], 1, size - i, file);
                i += read;
        }

        fclose(file);

        v8::Handle<v8::String> result = v8::String::New(chars, size);
        delete[] chars;
        return result;
}

• printValue

void printValue(Handle<Value> result) {
    //感謝downmooner兄的提醒，這個String::Utf8Value str(result)的確讓這段代碼
    //南轅北轍
    //String::Utf8Value str(result);


    // just construct the "result" script
    Handle<Script> script = Script::Compile(String::New("result"));
    result = script->Run();
    cout << *String::Utf8Value(result) << endl;
}

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