[英]How do you pass a variable from JavaScript to C++ in PPAPI?
I'm looking at someones code (not contactable) and they have set up a websocket client that talks to a server and runs some C++ code. 我正在查看某人的代码(不可联系),他们已经设置了一个与服务器对话并运行一些C ++代码的websocket客户端。 This is for the new Chrome PPAPI.
这是用于新的Chrome PPAPI。 I can pass variables from the client to the server but I'm not sure how to relay them to the C++ side of things to alter what happens in the code?
我可以将变量从客户端传递到服务器,但是我不确定如何将其中继到C ++端以更改代码中发生的事情?
So if the client passes a 1 the C++ code does one thing and if a 2 it does another. 因此,如果客户端传递1,则C ++代码执行一件事,如果传递2,则另一件事。 I just can't see how it's doing it.
我只是看不到它是怎么做的。
The JavaScript that seems to start the C++ code running is: 似乎可以启动C ++代码运行的JavaScript是:
function onStartTest(e)
{
console.log('Start Test');
var hostname = document.getElementById('hostname').value;
var message = 'start:'+hostname;
common.logMessage(message);
common.naclModule.postMessage(message);
e.preventDefault();
return false;
}
I've looked at a few examples to no avail. 我看了几个例子都没有用。
All asynchronous messages from JavaScript are handled in the HandleMessage function, defined in your pp::Instance: 来自JavaScript的所有异步消息都在pp :: Instance中定义的HandleMessage函数中处理:
class MyInstance : public pp::Instance {
...
virtual void HandleMessage(const pp::Var& message) {
...
}
};
In your example, you are sending a string value. 在您的示例中,您正在发送一个字符串值。 To extract it, you can use the pp::Var::AsString method:
要提取它,可以使用pp :: Var :: AsString方法:
virtual void HandleMessage(const pp::Var& message) {
if (message.is_string()) {
std::string str_message = message.AsString();
...
}
}
If you just want to pass numbers, you can do that too: 如果您只想传递数字,也可以这样做:
virtual void HandleMessage(const pp::Var& message) {
if (message.is_int()) {
int32_t int_message = message.AsInt();
switch (int_message) {
case 1: ...
case 2: ...
}
}
}
Take a look at the documentation here for more info. 请查看此处的文档以获取更多信息。 You can send ArrayBuffers, and even arbitrary objects as well.
您可以发送ArrayBuffers,甚至可以发送任意对象。
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