Question

我尝试使用：

git clone git://github.com/v8/v8.git v8 && cd v8 or svn checkout http://v8.googlecode.com/svn/trunk/ v8

使用libs：

make dependencies
sudo apt-get install apt-file;
sudo apt-get install libc6-dev-i368 lib32stdc++6;

当我尝试编译一个简单的文件时：

int main(int argc, char* argv[]) {

  // Create a string containing the JavaScript source code.
  String source = String::New("'Hello' + ', World'");

  // Compile the source code.
  Script script = Script::Compile(source);

  // Run the script to get the result.
  Value result = script->Run();

  // Convert the result to an ASCII string and print it.
  String::AsciiValue ascii(result);
  printf("%s\n", *ascii);
  return 0;
}

命令使用：

g++ test.cpp -Ideps/v8/include -Ldeps/v8/ -lv8 -lpthread

我得到以下错误输出：

v8/src/

test.cpp: Na função ‘int main(int, char**)’:
test.cpp:4:3: error: ‘String’ was not declared in this scope
test.cpp:4:10: error: expected ‘;’ before ‘source’
test.cpp:7:3: error: ‘Script’ was not declared in this scope
test.cpp:7:10: error: expected ‘;’ before ‘script’
test.cpp:10:3: error: ‘Value’ was not declared in this scope
test.cpp:10:9: error: expected ‘;’ before ‘result’
test.cpp:13:3: error: ‘String’ is not a class or namespace
test.cpp:13:22: error: expected ‘;’ before ‘ascii’
test.cpp:14:19: error: ‘ascii’ was not declared in this scope
test.cpp:14:24: error: ‘printf’ was not declared in this scope

问题是什么？有人能指出我正确的方向吗？

Answer 1

基于@Sim的回答，这是工作版本。

#include "v8.h"
using namespace v8;


int main(int argc, char* argv[]) 
{

  // Get the default Isolate created at startup.
  Isolate* isolate = Isolate::GetCurrent();

  // Create a stack-allocated handle scope.
  HandleScope handle_scope(isolate);

  // Create a new context.
  Handle<Context> context = Context::New(isolate);

  // Here's how you could create a Persistent handle to the context, if needed.
  Persistent<Context> persistent_context(isolate, context);

  // Enter the created context for compiling and
  // running the hello world script. 
  Context::Scope context_scope(context);

  // Create a string containing the JavaScript source code.
  Local<String> source = String::New("'Hello' + ', World'");

  // Compile the source code.
  Local<Script> script = Script::Compile(source);

  // Run the script to get the result.
  Local<Value> result = script->Run();

  // Convert the result to an ASCII string and print it.
  String::AsciiValue ascii(result);
  printf("%s\n", *ascii);
  return 0;
}

要编译并运行它，假设../include中的v8头文件和../lib中的v8库

g++ -L../lib -I../include hello.cc -o a.out -lv8_base.x64 -lv8_snapshot -lpthread && ./a.out

Answer 2

您尝试编译的C ++代码是从V8“入门”指南中获取的部分示例（“伪代码”）。它无法正常工作。下面的相同文档说明了运行此操作所需的内容：

包含v8.h标头并将您的项目链接到静态（或共享）V8库。
导入v8命名空间（using namespace v8）;
获取默认隔离（Isolate::GetCurrent()）的参考/指针。
为本地句柄创建一个HandleScope。
创建并输入V8执行上下文。
只有这样你才能使用上面的代码。

有关详细信息，请参阅V8 Getting Started Guide。

我尝试在V8中编译c ++时遇到很多错误 - JavaScript

2 个答案: