C++和js相互调用是个有意思的事情。
一、js中调用C++函数。函数原型
int g_FunSub(int x,int y);调用方式如下：
<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" οnclick="CallCppFunSub(4,7)">调用C++函数</button> </body> </html> 具体实现是在C++代码中写的： #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) { //重写GetExternal返回一个ClientCall对象 *ppDispatch = this; return S_OK; } }; #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 从200开始 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: { // 注意参数顺序，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); }
二、C++调用js方法。 function JsFunSub(x,y)C++中这么调用： void CMainFrameWnd::OnClick(TNotifyUI& msg) { CDuiString sCtrlName = msg.pSender->GetName(); if (sCtrlName.CompareNoCase(_T("CallJsBtn")) == 0) { // C++调用js方法，示例 // 注意参数顺序，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中这样实现： <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" οnclick="CallCppFunSub(4,7)">调用C++函数</button> </body> </html> C++调用javascript请移步这里： http://blog.csdn.net/sunflover454/article/details/60570940
示例工程下载地址(VS2013)：
http://download.csdn.net/detail/sunflover454/9774299
