duilib CWebBrowser控制元件 C++呼叫js函式&&js中呼叫C++函式
阿新 • • 發佈：2019-01-10
C++和js相互呼叫是個有意思的事情。
一、js中呼叫C++函式。函式原型
int g_FunSub(int x,int y);呼叫方式如下：
具體實現是在C++程式碼中寫的：<html> <head> <meta charset="utf-8" /> <title></title> <script language="javascript"> function CallCppFunSub(x,y) { var num = window.external.g_FunSub(x,y); alert(num); return num } function JsFunSub(x,y) { var num = x - y; alert(num); return num } </script> </head> <body> <button type="button" onclick="CallCppFunSub(4,7)">呼叫C++函式</button> </body> </html>
#pragma once class CWebBrowserExUI : public CWebBrowserUI { public: CWebBrowserExUI(); ~CWebBrowserExUI(); LPCTSTR GetClass() const; LPVOID GetInterface(LPCTSTR pstrName); virtual HRESULT STDMETHODCALLTYPE GetIDsOfNames(__RPC__in REFIID riid, __RPC__in_ecount_full(cNames) LPOLESTR *rgszNames, UINT cNames, LCID lcid, __RPC__out_ecount_full(cNames) DISPID *rgDispId); virtual HRESULT STDMETHODCALLTYPE Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr); virtual HRESULT STDMETHODCALLTYPE GetExternal(IDispatch **ppDispatch) { //重寫GetExternal返回一個ClientCall物件 *ppDispatch = this; return S_OK; } };
二、C++呼叫js方法。#include "stdafx.h" #include "WebBrowserExUI.h" #include <atlcomcli.h> int g_FunSub(int x, int y) { return (x - y); } CWebBrowserExUI::CWebBrowserExUI() { } CWebBrowserExUI::~CWebBrowserExUI() { } LPCTSTR CWebBrowserExUI::GetClass() const { return _T("WebBrowserExUI"); } LPVOID CWebBrowserExUI::GetInterface(LPCTSTR pstrName) { if (_tcsicmp(pstrName, _T("WebBrowserEx")) == 0) return static_cast<CWebBrowserExUI*>(this); return CActiveXUI::GetInterface(pstrName); } HRESULT CWebBrowserExUI::GetIDsOfNames(const IID& riid, LPOLESTR* rgszNames, UINT cNames, LCID lcid, DISPID* rgDispId) { //DISP ID 從200開始 if (_tcscmp(rgszNames[0], _T("g_FunSub")) == 0) *rgDispId = 500; return S_OK; } HRESULT CWebBrowserExUI::Invoke(DISPID dispIdMember, const IID& riid, LCID lcid, WORD wFlags, DISPPARAMS* pDispParams, VARIANT* pVarResult, EXCEPINFO* pExcepInfo, UINT* puArgErr) { //MyOutputDebugStringW(L"%d\n", dispIdMember); switch (dispIdMember) { case 500: { // 注意引數順序，反向 VARIANTARG *varArg = pDispParams->rgvarg; int x = _ttoi(static_cast<_bstr_t>(varArg[1])); int y = _ttoi(static_cast<_bstr_t>(varArg[0])); int n = g_FunSub(x, y); *pVarResult = CComVariant(n); return S_OK; } default: break; } return CWebBrowserUI::Invoke(dispIdMember, riid, lcid, wFlags, pDispParams, pVarResult, pExcepInfo, puArgErr); }
function JsFunSub(x,y)void CMainFrameWnd::OnClick(TNotifyUI& msg)
{
CDuiString sCtrlName = msg.pSender->GetName();
if (sCtrlName.CompareNoCase(_T("CallJsBtn")) == 0)
{
// C++呼叫js方法，示例
// 注意引數順序，反向
VARIANT arg[2] = { CComVariant(7),CComVariant(3)};//JsFunSub(3,7)
VARIANT varRet;
m_pBrowser->InvokeMethod(m_pBrowser->GetHtmlWindow(),_T("JsFunSub"),&varRet,arg,2);
int nResult = varRet.intVal;//-4
return;
}
WindowImplBase::OnClick(msg);
}js中這樣實現：
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script language="javascript">
function CallCppFunSub(x,y)
{
var num = window.external.g_FunSub(x,y);
alert(num);
return num
}
function JsFunSub(x,y)
{
var num = x - y;
alert(num);
return num
}
</script>
</head>
<body>
<button type="button" onclick="CallCppFunSub(4,7)">呼叫C++函式</button>
</body>
</html> C++呼叫javascript請移步這裡：http://blog.csdn.net/sunflover454/article/details/60570940
示例工程下載地址(VS2013)：