如何从C++使用V8访问和调用JavaScript Object属性和方法?
问题描述:
我想要一个如何访问和使用v8引擎从C++调用JavaScript对象属性和方法的示例。该文档展示了如何通过javascript访问C++对象和函数,但不是其他方式。如何从C++使用V8访问和调用JavaScript Object属性和方法?
这里有一个简单的对象构造和实例在JS:
function MyObj()
{
this.myArray = [];
this.myDouble = 0;
this.myFunction = function(arg1,arg2)
{ return (myDouble + arg1 + arg2); }
}
var globalObject = new myObj();
我将如何访问globalObject的属性和方法?还有一个相关的问题 - 我如何从C++填充数组(globalObject.myArray)?
问候,
PRIS
答
我没有测试下面的实施例。
但我相信它举了一个你想要的例子。
#include <v8.h>
using namespace v8;
int main(int argc, char* argv[]) {
// Create a handle scope
HandleScope handle_scope;
// Create a new context.
Handle<Context> context = Context::New();
// Enter the created context for compiling and
// running the script.
Context::Scope context_scope(context);
// Create a new script
const char* script = "function MyObj() { this.myArray = []; this.myDouble = 0; this.myFunction = function(arg1,arg2) { return (myDouble + arg1 + arg2); } } var globalObject = new myObj();"
// Create a string containing the JavaScript source code.
Handle<String> source = String::New("script);
// Compile the source code.
Handle<Script> script = Script::Compile(source);
// Running the script
// Run the script to get the result.
Handle<Value> scriptresult = script->Run();
// Convert the result to an ASCII string and print it.
String::AsciiValue ascii(scriptresult);
printf("%s\n", *ascii);
// Get the object
Handle<Object> object = Local::Cast(context->Global()->Get(String::New("globalObject")));
// Get the Properties
Handle<Value> arrayproperty = Handle::Cast(object->Get(String::New("myArray")));
Handle<Value> doubleproperty = Handle::Cast(object->Get(String::New("myDouble")));
String::AsciiValue ascii2(arrayproperty);
String::AsciiValue ascii3(doubleproperty);
printf("%s\n", *ascii2);
printf("%s\n", *ascii3);
// Call the function
Handle fun_to_call = Handle::Cast(object->Get(String::New("myFunction")));
int argcount = 0;
Handle argarray[] = NULL;
Handle functionresult = fun_to_call->Call(object, argcount, argarray);
// argcount and argarray are your standard arguments to a function
return 0;
}
至于如何修改数组,我相信它会使用
// Get the object
Handle<Object> object = Local::Cast(context->Global()->Get(String::New("globalObject")))1;
//Initialise array
int num[4] = {1,2,3,4};
v8::Local<v8::Array> arguments = v8::Array::New(num);
for (int i = 0; i < args; i++) {
arguments.Set(v8::Number::New(i), v8::String::New(args[i]));
}
// Set Array
object->Set(v8::String::New("myArray"), arguments);
参考
Connecting C++ to Javascript bungeeconnect
V8 Users Mailing List Can you populate a v8::Array from C++? Thread
答
作为后续Appleman的完整的答案,对于它的价值,我不得不使用->
代替.
,你不必分配新v8::Number
对于第一个参数Set
:
v8::Local<v8::Array> r = v8::Array::New(10);
for (uint32_t i = 0; i < 10; ++i) {
r->Set(i, v8::Number::New(i));
}
答
对不起,刷新,但是我正在寻找完全相同的事情,我dont't所以也许有人会需要它。
targetObj->GetOwnPropertyNames(context,v8::PropertyFilter::ALL_PROPERTIES)
你只需要添加一个过滤器:))