V8 Hello编译错误:无法将“v8：：Local<v8：：String>”转换为“V8：：String”

Question

我是V8的新手。我试图运行Hello示例表单这里。

但是，我在这一行中得到了编译错误：

v8::String source = v8::String::New("'Hello' + ', World'");

error C2440: 'initializing' : cannot convert from 'v8::Local<v8::String>' to 'v8::String'

我为什么要犯这个错误？

Answer 1

字符串类发生了更改。它没有新方法了；它有NewFrom*方法：

static Local< String >  NewFromUtf8 (Isolate *isolate, const char *data, NewStringType type=kNormalString, int length=-1)
static Local< String >  NewFromOneByte (Isolate *isolate, const uint8_t *data, NewStringType type=kNormalString, int length=-1)
static Local< String >  NewFromTwoByte (Isolate *isolate, const uint16_t *data, NewStringType type=kNormalString, int length=-1)

您可以浏览doxygen文档：1String.html#aa4b8c052f5108ca6350c45922602b9d4

可以这样创建字符串：

v8::Isolate* i = v8::Isolate::New();//create an isolate instance
//( if you already have one just get it: GetIsolate() 
//=>http://bespin.cz/~ondras/html/classv8_1_1Context.html
v8::Local<v8::String> constant_name = v8::String::NewFromUtf8(i,"asd");
i->Dispose();