ActiveX与JS交互

 

1．在COM组件中调用JavaScript函数
// 连接点方式页面javascript脚本
<object classid="CLSID:B568F111-DFE4-4944-B67F-0728AB2AB30F" id="testCom" VIEWASTEXT></object>
<script language="JavaScript" for="testCom" event="staTe(s)">
        alert("State(" + s + ")");
        return 123;
</script>
<script language="JavaScript">
        testCom.FireStateEvent("Hello");
</script>

// 事件属性方式页面javascript脚本
function onState(s){
        alert("onState(" + s + ")");
        return 456;
}
var o = new ActiveXObject("TestATL.TestCom");
o.onstaTe=onState;
o.FireStateEvent("Hello");

// Com组件VC7.1 ATL代码
__interface _ITestComEvents{
        [id(1), helpstring("State事件")] HRESULT State([in] BSTR str);
};
__event __interface _ITestComEvents;
IDispatchPtr m_onState;        // 事件属性
STDMETHOD(get_onState)(IDispatch** pVal) {
        *pVal = m_onState;
        return S_OK;
};
STDMETHOD(put_onState)(IDispatch* newVal) {
        m_onState = newVal;
        return S_OK;
};
STDMETHOD(FireStateEvent)(BSTR str) {
        __raise State(str);        // 激发连接点事件
        CComVariant result;
        CComVariant avarParams[1] = {str};
        DISPPARAMS dispParams = {avarParams, NULL, 1, 0};
        EXCEPINFO excepInfo;
        memset(&excepInfo, 0, sizeof excepInfo);
        UINT nArgErr = (UINT)-1;      // initialize to invalid arg
        if (m_onState)        // 激发属性事件
            HRESULT hr = m_onState->Invoke(0, IID_NULL, LOCALE_USER_DEFAULT,
                DISPATCH_METHOD, &dispParams, &result, &excepInfo, &nArgErr);
        return S_OK;
}
参见：
How To Call a Script Function from a VC WebBrowser Application
如何在COM object中使用 Javascript function object?
在COM组件中调用JavaScript函数

2．从页面javascript向Com组件传递结构数组
// 页面脚本
var o = new ActiveXObject("TestATL.TestCom");
o.onstaTe=onState;
o.Put("array", {0: 123, 1: "abc"});
o.Put("array", [456, "def"]);
o.Put("array", [{name: "tom", age: 8}, {name: "jack", age: 10}]);
var a = new Array(789, "ghi"); // has "length" property
o.Put("array", a);

// Com组件VC7.1 ATL代码
STDMETHODIMP CTestCom::Put(BSTR key, VARIANT value)
{
WCHAR output[4096] = L"";
if(0 == wcsicmp(key, L"array") && VT_DISPATCH == value.vt)
{
     IDispatchPtr spDisp = value.pdispVal;
     DISPID dispID = 0;
     DISPPARAMS dispParams = {NULL, NULL, 0, 0};
     CComVariant result;
     EXCEPINFO excepInfo;
     memset(&excepInfo, 0, sizeof excepInfo);
     UINT nArgErr = (UINT)-1; // initialize to invalid arg
     unsigned int length = 0; // 数组长度 或 属性 个数

     LPOLESTR func = L"length";
     HRESULT hr = spDisp->GetIDsOfNames(GUID_NULL, &func, 1, LOCALE_SYSTEM_DEFAULT, &dispID);
     if(S_OK == hr){       // 如果有"length"属性
      hr = spDisp->Invoke(dispID, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_PROPERTYGET, &dispParams, &result, &excepInfo, &nArgErr);
      if(S_OK == hr && VT_I4 == result.vt)
       length = result.intVal;       // 直接读取数组长度
     }else{
      unsigned int nTypeInfo = 0;
      hr = spDisp->GetTypeInfoCount(&nTypeInfo);
      ATLASSERT(1 == nTypeInfo);
      ITypeInfoPtr spTypeInfo;
      hr = spDisp->GetTypeInfo(0, 0, &spTypeInfo);
      TYPEATTR *pTypeAttr = NULL;
      hr = spTypeInfo->GetTypeAttr(&pTypeAttr);
      //ATLASSERT("{C59C6B12-F6C1-11CF-8835-00A0C911E8B2}" == pTypeAttr->guid);     // JScript: 
      length = pTypeAttr->cVars;       // 从类型信息读取数组长度
      spTypeInfo->ReleaseTypeAttr(pTypeAttr);
     }
     for(unsigned int i=0; i<length; i++)
     {
      WCHAR buf[32];
      _itow(i, buf, 10);
      func = buf;
      hr = spDisp->GetIDsOfNames(GUID_NULL, &func, 1, LOCALE_SYSTEM_DEFAULT, &dispID);
      hr = spDisp->Invoke(dispID, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_PROPERTYGET, &dispParams, &result, &excepInfo, &nArgErr);
      if(S_OK != hr)
       continue;
      if(VT_DISPATCH == result.vt){
       IDispatchPtr spItem = result.pdispVal;
       func = L"name";
       hr = spItem->GetIDsOfNames(GUID_NULL, &func, 1, LOCALE_SYSTEM_DEFAULT, &dispID);
       hr = spItem->Invoke(dispID, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_PROPERTYGET, &dispParams, &result, &excepInfo, &nArgErr);
       if(S_OK == hr && VT_BSTR == result.vt)
        swprintf(output + wcslen(output), L"name=%s", result.bstrVal);
       func = L"age";
       hr = spItem->GetIDsOfNames(GUID_NULL, &func, 1, LOCALE_SYSTEM_DEFAULT, &dispID);
       hr = spItem->Invoke(dispID, IID_NULL, LOCALE_USER_DEFAULT, DISPATCH_PROPERTYGET, &dispParams, &result, &excepInfo, &nArgErr);
       if(S_OK == hr && VT_I4 == result.vt)
        swprintf(output + wcslen(output), L" age=%d/n", result.intVal);
      }else if(VT_BSTR == result.vt)
       swprintf(output + wcslen(output), L"BSTR:%s/n", result.bstrVal);
      else if(VT_I4 == result.vt)
       swprintf(output + wcslen(output), L"I4:%d/n", result.intVal);
      else
       swprintf(output + wcslen(output), L"item.vt=%d/n", result.vt);
     }
}
FireStateEvent(output);
return S_OK;
}

3．枚举IE窗口的内容，并调用其中的脚本
#import <mshtml.tlb>       // Internet Explorer 5
#import <shdocvw.dll> 
        SHDocVw::IShellWindowsPtr spSHWinds; 
        spSHWinds.CreateInstance(__uuidof(SHDocVw::ShellWindows));
        long nCount = spSHWinds->GetCount();
        IDispatchPtr spDisp;
        for (long i = 0; i < nCount; i++)
        {
         _variant_t va(i, VT_I4);
         spDisp = spSHWinds->Item(va);
         SHDocVw::IWebBrowser2Ptr spBrowser(spDisp);
         if (spBrowser != NULL)
         {
          _bstr_t location = spBrowser->GetLocationName();
          if(_bstr_t(L"Test DapCtrl") == location)       // 找指定IE窗口
          {
           IHTMLDocument2Ptr spDoc(spBrowser->GetDocument());
           if (spDoc != NULL)
           {
            _bstr_t exp = m_onState;
            IDispatch *pdis = NULL;
            hr = spDoc->get_Script(&pdis);
            if(pdis){
             DISPID tmpDispID = 0;
             LPOLESTR func = L"Test"; // javascript 函数名
             hr = pdis->GetIDsOfNames(GUID_NULL, &func, 1, LOCALE_SYSTEM_DEFAULT, &tmpDispID);
             if(S_OK == hr)
              hr = pdis->Invoke(tmpDispID, IID_NULL, LOCALE_USER_DEFAULT,
               DISPATCH_METHOD, &dispParams, &result, &excepInfo, &nArgErr);
            }
           }
          }
         }
        }
参见：
HOWTO: Connect to a Running Instance of Internet Explorer
ActiveX组件与JavaScript交互
ActiveX组件控制其所在的IE窗口

4．在VC中执行脚本
#import <msscript.ocx>       // msscript.ocx 
using namespace MSScriptControl;
        IScriptControlPtr pScriptControl(__uuidof(ScriptControl));
        LPSAFEARRAY psa;
        SAFEARRAYBOUND rgsabound[]       = { 1, 0 }; // 1 elements, 0-based
        int i;
        psa = SafeArrayCreate(VT_VARIANT, 1, rgsabound);
        if (!psa)
        {
         return E_OUTOFMEMORY;
        }
        VARIANT vFlavors[1];
        for (i = 0; i < 1; i++)
        {
         VariantInit(&vFlavors[i]);
         V_VT(&vFlavors[i]) = VT_BSTR;
        }
        V_BSTR(&vFlavors[0]) = SysAllocString(bstr);
        long lZero = 0;
        hr = SafeArrayPutElement(psa, &lZero,&vFlavors[0]);
        for(i=0;i<1;i++)
        {
         SysFreeString(vFlavors[i].bstrVal);
        }
        pScriptControl->Language = "JScript";
        pScriptControl->AllowUI = TRUE;
        _bstr_t exp = L"1+2+3";
        _variant_t outpar = pScriptControl->Eval(exp);
        //_variant_t outpar = pScriptControl->ExecuteStatement(exp);
        //_variant_t outpar = pScriptControl->Run("MyStringFunction", &psa);
        _bstr_t bstrReturn = (_bstr_t)outpar;
        char *pResult = (char *)bstrReturn;
        SafeArrayDestroy(psa);
参见：
How To Call Run() Method of the Microsoft Script Control in C++