com组件如何异步调用js函数？

Question

在js中使用com组件，将js中的一个函数作为回调函数设置给com组件；在主线程中调用这个回调函数没有问题，但是如果在另一个线程里面调用这个回调函数则总是失败，请哪位大拿解决一下这个问题？

//初始化创建线程
STDMETHODIMP CJSCallBack::Initialize(void)
{
	// TODO: 在此添加实现代码
	DWORD dThreadId;
	m_hThreadHandle = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)CallJspFunctionThread, this, 0, &dThreadId);	
	return S_OK;
}
//线程函数
UINT CJSCallBack::CallJspFunctionThread(LPVOID param)
{
	CJSCallBack* pCallBack = (CJSCallBack*)param;
	while(m_bRunThread)
	{
		while(m_bCallJspFunc)
		{
			pCallBack->CallJsFunction();
			m_bCallJspFunc = FALSE;
		}
		Sleep(1);
	}
	return 0;
}
//设置回调函数
STDMETHODIMP CJSCallBack::SetJsCallbackFunc(VARIANT scriptCallback)
{
	// TODO: 在此添加实现代码
	if (scriptCallback.vt == VT_DISPATCH)
	{
		m_spCallback = scriptCallback.pdispVal;
	}
	return S_OK;
}
//调用回调函数
void CJSCallBack::CallJsFunction()
{
	CComVariant avarParams[1];
	avarParams[0] = m_szDisplay; //指定回调函数的参数
	DISPPARAMS params = { avarParams, NULL, 1, 0 };
	if(m_spCallback)
	{
		HRESULT hr = m_spCallback->Invoke(0, 
			IID_NULL, 
			LOCALE_USER_DEFAULT, 
			DISPATCH_METHOD, 
			&params, NULL, NULL, NULL);
	}
}
//触发调用回调函数
STDMETHODIMP CJSCallBack::Print(BSTR bstrToPrint, LONG lWait)
{
	// TODO: 在此添加实现代码
	_bstr_t bsPrint = bstrToPrint; 
	char* szPrint = bsPrint;
	Sleep(500);
	m_szDisplay = "Succeed to Print";
	HRESULT hr = CallPrintFunction(szPrint);
	if ( FAILED(hr) )
	{
		m_szDisplay = "Failed to Print";
	}
	switch (lWait)
	{
	case 0:
		CallJsFunction();
		break;
	case 1:
		{
			m_bCallJspFunc = TRUE;
			Sleep(30);
		}
		break;
	default:
		break;
	}
	return S_OK;
}
function TestCallBack() {
		var obj = new ActiveXObject("CallBackForJs.JSCallBack.1"); 		
        var result = obj.Initialize();
		result = obj.SetJsCallbackFunc(printMsg);		
		obj.Print("abc",1);
		obj.UnInitialize();
    }
function printMsg(msg) {
        alert(msg);
    }

Answer 1

http://blog.csdn.net/cheungmine/article/details/1451489

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Answer 2

JS是单线程的，如果你要在背景线程中触发回调的话，发个消息到主线程再调用这个js函数。

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Visual C++ MVP