V8引擎静态库及其调用方法
本V8引擎静态库分为x86版本和x64版本
V8引擎静态库下载地址
编译工具：VS2019
v8开头的即为V8引擎静态库（附送其它开源静态库libuv.lib、zlib.lib等_）
如何调用V8引擎
1、下载v8静态库到本地
2、配置开发环境
将上述v8的include目录配置到“附加包含目录”配置项中
根据你的开发环境配置不同版本的lib库（注意debug和release），如下：
3、调用代码如下，需要创建一个控制台程序
#include strName = ToLocalString(isolate, (const unsigned char*)pThis->m_pszName, strlen(pThis->m_pszName));
args.GetReturnValue().Set(strName);
}
public:
int m_iAge;
const char* m_pszName;
};
void TestFuncByJsCall(const FunctionCallbackInfo<Value>& args)
{
Isolate* isolate = args.GetIsolate();
int iLen = args.Length();
if (iLen != 2)
return;
if (!args[0]->IsInt32())
return;
if (!args[1]->IsString())
return;
Local<Context> context = isolate->GetCurrentContext();
int i = 0;
args[0]->Int32Value(context).To(&i);
String::Utf8Value str(isolate, args[1]);
//cout << *str << "\n";
cout << "进入函数：" << __FUNCTION__ << "(" << i << ", \"" << *str << "\")" << "\n";
args.GetReturnValue().Set(100);
}
class PersistentToLocal
{
public:
// If persistent.IsWeak() == false, then do not call persistent.Reset()
// while the returned Local is still in scope, it will destroy the
// reference to the object.
template <class TypeName>
static inline v8::Local<TypeName> Default(v8::Isolate* isolate,
const v8::PersistentBase<TypeName>& persistent) {
if (persistent.IsWeak()) {
return PersistentToLocal::Weak(isolate, persistent);
}
else {
return PersistentToLocal::Strong(persistent);
}
}
// Unchecked conversion from a non-weak Persistent to Local,
// use with care!
//
// Do not call persistent.Reset() while the returned Local is still in
// scope, it will destroy the reference to the object.
template <class TypeName>
static inline v8::Local<TypeName> Strong(
const v8::PersistentBase<TypeName>& persistent) {
return *reinterpret_cast<v8::Local<TypeName>*>(
const_cast<v8::PersistentBase<TypeName>*>(&persistent));
}
template <class TypeName>
static inline v8::Local<TypeName> Weak(
v8::Isolate* isolate,
const v8::PersistentBase<TypeName>& persistent) {
return v8::Local<TypeName>::New(isolate, persistent);
}
};
int main(int argc, char* argv[])
{
cout << argv[0] << "\n";
// V8初试化.
V8::InitializeICU();
// 加载快照文件：natives_blob.bin、snapshot_blob.bin
V8::InitializeICUDefaultLocation(argv[0]);
//V8::InitializeExternalStartupData(argv[0]);
// V8::InitializeExternalStartupDataFromFile("E:/VS2019/TestV8/x64/Debug/natives_blob.bin");
// V8::InitializeExternalStartupDataFromFile("E:/VS2019/TestV8/x64/Debug/snapshot_blob.bin");
// 生成一个默认的platform对象
std::unique_ptr<Platform> platform = platform::NewDefaultPlatform();
// 初始化platform
V8::InitializePlatform(platform.get());
// V8的初始化
V8::Initialize();
std::ofstream trace_file;
platform::InProcessStackDumping in_process_stack_dumping = // v8::platform::InProcessStackDumping::kDisabled;
platform::InProcessStackDumping::kEnabled;
// 创建isolate.
Isolate::CreateParams create_params;
create_params.array_buffer_allocator = ArrayBuffer::Allocator::NewDefaultAllocator();
Isolate* isolate = Isolate::New(create_params);
{
HandleScope scope(isolate);
// start v8 trace
//platform::tracing::TraceConfig* trace_config;
//trace_config = v8::platform::tracing::TraceConfig::CreateDefaultTraceConfig();
//tracing_controller->StartTracing(trace_config);
Local<Context> context = Context::New(isolate);
Context::Scope context_scope(context);
/
// 一、执行JS脚本中的函数
/
Local<String> source = String::NewFromUtf8(isolate,
"function add(a, b){ var vmap = new Map(); vmap.set(\"123\", 1234); return vmap.get(\"123\");} add(1,1);",
NewStringType::kNormal).ToLocalChecked();
Local<Script> script = Script::Compile(context, source).ToLocalChecked();
Local<Value> result = script->Run(context).ToLocalChecked();
if (result->IsNumber())
std::cout << "Test V8 jet : add(1,1) = " << Int32::Cast(*result)->Value() << "\n";
//const char* pszFuncName = "func";
//Local strFuncName = ToLocalString(isolate, (const unsigned char*)pszFuncName, strlen(pszFuncName));
/
// 二、JS调用C函数
/
//Local global_template = ObjectTemplate::New(isolate);
//global_template->Set(isolate, "TestFunc", FunctionTemplate::New(isolate, TestFuncByJsCall));
context->Global()->Set(context, String::NewFromUtf8(isolate, "TestFunc").ToLocalChecked(),
Function::New(context, TestFuncByJsCall).ToLocalChecked()).FromJust();
Local<String> jsCall = String::NewFromUtf8(isolate,
"TestFunc(1, 'Call From C++');", NewStringType::kNormal).ToLocalChecked();
Local<Script> scriptFunc;
Local<Value> ret;
if (Script::Compile(context, jsCall).ToLocal(&scriptFunc) &&
scriptFunc->Run(context).ToLocal(&ret))
{
if (ret->IsNumber())
std::cout << "Test V8 jet : TestFuncByJsCall = " << Int32::Cast(*ret)->Value() << "\n";
}
/
// 三、JS调用C++类
/
Local<FunctionTemplate> clsPerson = FunctionTemplate::New(isolate, CPerson::New,
Local<Value>(), Local<Signature>(), 0,
ConstructorBehavior::kAllow, SideEffectType::kHasSideEffect);
const char* pszClsName = "Person";
Local<String> clsName = ToLocalString(isolate, (const unsigned char*)pszClsName, strlen(pszClsName));
clsPerson->SetClassName(clsName);
Local<ObjectTemplate> objPerson = clsPerson->InstanceTemplate();
objPerson->SetInternalFieldCount(1);
// 1、设置CPerson类的构造函数到全局Global中
context->Global()->Set(context, clsName, clsPerson->GetFunction(context).ToLocalChecked()).Check();
// 2、设置GetAge方法到CPerson类中
Local<Signature> signature = Signature::New(isolate, clsPerson);
Local<String> NameGetAge = String::NewFromUtf8(isolate, "GetAge",
NewStringType::kInternalized).ToLocalChecked();
Local<FunctionTemplate> t = FunctionTemplate::New(isolate, CPerson::GetAge);
/*Local(), signature, 0, ConstructorBehavior::kThrow,
SideEffectType::kHasSideEffectToReceiver);*/
clsPerson->PrototypeTemplate()->Set(NameGetAge, t);
//clsPerson->PrototypeTemplate()->Set(isolate, "GetAge", t);
t->SetClassName(NameGetAge);
objPerson->Set(isolate, "GetAge", t);
objPerson->Set(isolate, "GetName", FunctionTemplate::New(isolate, CPerson::GetName));
// PersistentBase::Strong(Person_NEW);
// 3、执行脚本
Local<String> jsPerson = String::NewFromUtf8(isolate,
" var Values; "
" function TestPerson(i){ var person = new Person(i); "
" Values = person.GetName(); "
//" person.GetPage = OnGetPage();"
" person = null; return Values; "
"} "
"TestPerson(42);",
NewStringType::kNormal).ToLocalChecked();
// return person.GetAge();
Local<Script> scriptClass;
Local<Value> retClass;
if (Script::Compile(context, jsPerson).ToLocal(&scriptClass) &&
scriptClass->Run(context).ToLocal(&retClass))
{
if (retClass->IsNumber())
std::cout << "Test V8 jet : Person = GetAge() " << Int32::Cast(*retClass)->Value() << "\n";
else if (retClass->IsString())
{
String::Utf8Value str(isolate, retClass);
string strName = Utf8ToAnsi(*str);
std::cout << "Test V8 jet : Person = GetName() " << strName.c_str() << "\n";
}
// C++调用JS中的变量和函数
Local<String> strValues = String::NewFromUtf8(isolate, "Values", NewStringType::kNormal).ToLocalChecked();
Local<Value> jsValues = context->Global()->Get(context, strValues).ToLocalChecked();
Local<Value> jsFunc = context->Global()->Get(context,
String::NewFromUtf8(isolate, "TestPerson", NewStringType::kNormal).ToLocalChecked()).ToLocalChecked();
if (jsValues.IsEmpty())
printf("empty\n");
else if (jsValues->IsInt32())
{
int iAge = jsValues.As<Int32>()->Value();
printf("C++ Call JS values: %d\n", iAge);
}
else if (jsValues->IsString())
{
String::Utf8Value str(isolate, jsValues);
string strName = Utf8ToAnsi(*str);
printf("C++ Call JS values: %s\n", strName.c_str());
}
if (jsFunc->IsFunction())
{
Local<Function> callback = jsFunc.As<Function>();
Local<Value> recv = Undefined(isolate);
Local<Value> ret_v;
Local<Value> argv[1];
argv[0] = Integer::New(isolate, 56);
callback->Call(context, recv, 1, argv).ToLocal(&ret_v);
if (ret_v->IsString())
{
String::Utf8Value str(isolate, ret_v);
string strName = Utf8ToAnsi(*str);
printf("C++ Call JS Fuction: %s\n", strName.c_str());
}
}
} // end JS调用C++类
}
char c;
std::cin >> c;
// 关掉v8.
isolate->Dispose();
V8::Dispose();
V8::ShutdownPlatform();
platform.reset();
}