JavaScript调用MFC代码

最新推荐文章于 2023-03-15 12:11:02 发布

转载最新推荐文章于 2023-03-15 12:11:02 发布 · 354 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://blog.51cto.com/dlbrant/141445

文章标签：

#javascript #c/c++ #ui #ViewUI

本文介绍两种C++与JavaScript交互的方法：一是通过WebBrowser控件拦截导航请求；二是通过实现IDispatch接口允许JavaScript调用C++函数。文章详细展示了如何在MFC应用程序中实现这些功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

方案一：

// 利用webbrowser 控件

// C++: 响应的 webbrowser 消息函数OnBeforeNavigat2

virtual void OnBeforeNavigate2( LPCTSTR lpszURL, DWORD nFlags, LPCTSTR lpszTargetFrameName,

CByteArray& baPostedData, LPCTSTR lpszHeaders, BOOL* pbCancel );

// html & JavaScript code following

...

...

// C++ code following

CXXXDlg::OnBeforeNavigate2( LPCTSTR lpszURL, DWORD nFlags, LPCTSTR lpszTargetFrameName,

CByteArray& baPostedData, LPCTSTR lpszHeaders, BOOL* pbCancel )

{

CString strUrl = lpszURL;

if(strUrl.Left(4) == _T("app:"))

{

// cancel the common url navigate and call your c++ code here

*pbCancel = TURE;

// call other c++ function here or parse the argument in the strUrl

}

// go common url navigate here

}

方案二：
// 改写MFC程序的 Control Container

// html & javaScript following

...

function CallCpp()

{

alert('start to call cpp here');

window.external.JavaScriptCallCpp('This is a test for call C++ in JavaScript');

}

<button onclick="CallCpp()" >JavaScript访问C++代码</button>

...

// C++ code following

CString javaScriptName = _T("JavaScriptCallCpp");

#define DISPID_CallCppFromJs 1

// 实现IDispatch 接口

// .h

class CImpIDispatch : public IDispatch

{

protected:

ULONG m_cRef;

public:

CImpIDispatch(void);

~CImpIDispatch(void);

STDMETHODIMP QueryInterface(REFIID, void **);

STDMETHODIMP_(ULONG) AddRef(void);

STDMETHODIMP_(ULONG) Release(void);

//IDispatch

STDMETHODIMP GetTypeInfoCount(UINT* pctinfo);

STDMETHODIMP GetTypeInfo(/* [in] */ UINT iTInfo,

/* [in] */ LCID lcid,

/* [out] */ ITypeInfo** ppTInfo);

STDMETHODIMP GetIDsOfNames(

/* [in] */ REFIID riid,

/* [size_is][in] */ LPOLESTR *rgszNames,

/* [in] */ UINT cNames,

/* [in] */ LCID lcid,

/* [size_is][out] */ DISPID *rgDispId);

STDMETHODIMP Invoke(

/* [in] */ DISPID dispIdMember,

/* [in] */ REFIID riid,

/* [in] */ LCID lcid,

/* [in] */ WORD wFlags,

/* [out][in] */ DISPPARAMS *pDispParams,

/* [out] */ VARIANT *pVarResult,

/* [out] */ EXCEPINFO *pExcepInfo,

/* [out] */ UINT *puArgErr);

};

// .cpp

STDMETHODIMP CImpIDispatch::QueryInterface( REFIID riid, void **ppv )

{

*ppv = NULL;

if ( IID_IDispatch == riid )

{

*ppv = this;

}

if ( NULL != *ppv )

{

((LPUNKNOWN)*ppv)->AddRef();

return NOERROR;

}

return E_NOINTERFACE;

}

STDMETHODIMP_(ULONG) CImpIDispatch::AddRef(void)

{

return ++m_cRef;

}

STDMETHODIMP_(ULONG) CImpIDispatch::Release(void)

{

return --m_cRef;

}

//IDispatch

STDMETHODIMP CImpIDispatch::GetTypeInfoCount(UINT* /*pctinfo*/)

{

return E_NOTIMPL;

}

STDMETHODIMP CImpIDispatch::GetTypeInfo(

/* [in] */ UINT /*iTInfo*/,

/* [in] */ LCID /*lcid*/,

/* [out] */ ITypeInfo** /*ppTInfo*/)

{

return E_NOTIMPL;

}

STDMETHODIMP CImpIDispatch::GetIDsOfNames(

/* [in] */ REFIID riid,

/* [size_is][in] */ OLECHAR** rgszNames,

/* [in] */ UINT cNames,

/* [in] */ LCID lcid,

/* [size_is][out] */ DISPID* rgDispId)

{

HRESULT hr;

UINT i;

// Assume some degree of success

hr = NOERROR;

for ( i=0; i < cNames; i++) {

CString cszName = rgszNames[i];

if (cszName == javaScriptName)

{

rgDispId[i] = DISPID_CallCppFromJs;

}

else {

// One or more are unknown so set the return code accordingly

hr = ResultFromScode(DISP_E_UNKNOWNNAME);

rgDispId[i] = DISPID_UNKNOWN;

}

return hr;

}

STDMETHODIMP CImpIDispatch::Invoke(

/* [in] */ DISPID dispIdMember,

/* [in] */ REFIID /*riid*/,

/* [in] */ LCID /*lcid*/,

/* [in] */ WORD wFlags,

/* [out][in] */ DISPPARAMS* pDispParams,

/* [out] */ VARIANT* pVarResult,

/* [out] */ EXCEPINFO* /*pExcepInfo*/,

/* [out] */ UINT* puArgErr)

{

CXXXDlg* pDlg = (CCppCallJsDlg*) AfxGetMainWnd();

if (dispIdMember == DISPID_CallCppFromJs)

{

if (wFlags & DISPATCH_PROPERTYGET)

{

if (pVarResult != NULL)

{

VariantInit(pVarResult);

V_VT(pVarResult)=VT_BOOL;

V_BOOL(pVarResult)=true;

}

if (wFlags & DISPATCH_METHOD)

{

CString cszArg1= pDispParams->rgvarg[0].bstrVal;

pDlg->CallByScript(cszArg1);

}

return S_OK;

}

// 改写COleControlSit

// .h

class CCustomControlSite:public COleControlSite

{

public:

CCustomControlSite(COleControlContainer *pCnt):COleControlSite(pCnt){}

BEGIN_INTERFACE_PART(DocHostShowUI, IDocHostShowUI)

INIT_INTERFACE_PART(CDocHostSite, DocHostShowUI)

STDMETHOD(ShowHelp)(

/* [in ] */ HWND hwnd,

/* [in ] */ LPOLESTR pszHelpFile,

/* [in ] */ UINT uCommand,

/* [in ] */ DWORD dwData,

/* [in ] */ POINT ptMouse,

/* [out] */ IDispatch __RPC_FAR *pDispatchObjectHit);

STDMETHOD(ShowMessage)(

/* [in ] */ HWND hwnd,

/* [in ] */ LPOLESTR lpstrText,

/* [in ] */ LPOLESTR lpstrCaption,

/* [in ] */ DWORD dwType,

/* [in ] */ LPOLESTR lpstrHelpFile,

/* [in ] */ DWORD dwHelpContext,

/* [out] */ LRESULT __RPC_FAR *plResult);

END_INTERFACE_PART(DocHostShowUI)

protected:

DECLARE_INTERFACE_MAP();

BEGIN_INTERFACE_PART(DocHostUIHandler, IDocHostUIHandler)

STDMETHOD(ShowContextMenu)(/* [in] */ DWORD dwID,

/* [in] */ POINT __RPC_FAR *ppt,

/* [in] */ IUnknown __RPC_FAR *pcmdtReserved,

/* [in] */ IDispatch __RPC_FAR *pdispReserved);

STDMETHOD(GetHostInfo)(

/* [out][in] */ DOCHOSTUIINFO __RPC_FAR *pInfo);

STDMETHOD(ShowUI)(

/* [in] */ DWORD dwID,

/* [in] */ IOleInPlaceActiveObject __RPC_FAR *pActiveObject,

/* [in] */ IOleCommandTarget __RPC_FAR *pCommandTarget,

/* [in] */ IOleInPlaceFrame __RPC_FAR *pFrame,

/* [in] */ IOleInPlaceUIWindow __RPC_FAR *pDoc);

STDMETHOD(HideUI)(void);

STDMETHOD(UpdateUI)(void);

STDMETHOD(EnableModeless)(/* [in] */ BOOL fEnable);

STDMETHOD(OnDocWindowActivate)(/* [in] */ BOOL fEnable);

STDMETHOD(OnFrameWindowActivate)(/* [in] */ BOOL fEnable);

STDMETHOD(ResizeBorder)(

/* [in] */ LPCRECT prcBorder,

/* [in] */ IOleInPlaceUIWindow __RPC_FAR *pUIWindow,

/* [in] */ BOOL fRameWindow);

STDMETHOD(TranslateAccelerator)(

/* [in] */ LPMSG lpMsg,

/* [in] */ const GUID __RPC_FAR *pguidCmdGroup,

/* [in] */ DWORD nCmdID);

STDMETHOD(GetOptionKeyPath)(

/* [out] */ LPOLESTR __RPC_FAR *pchKey,

/* [in] */ DWORD dw);

STDMETHOD(GetDropTarget)(

/* [in] */ IDropTarget __RPC_FAR *pDropTarget,

/* [out] */ IDropTarget __RPC_FAR *__RPC_FAR *ppDropTarget);

STDMETHOD(GetExternal)(

/* [out] */ IDispatch __RPC_FAR *__RPC_FAR *ppDispatch);

STDMETHOD(TranslateUrl)(

/* [in] */ DWORD dwTranslate,

/* [in] */ OLECHAR __RPC_FAR *pchURLIn,

/* [out] */ OLECHAR __RPC_FAR *__RPC_FAR *ppchURLOut);

STDMETHOD(FilterDataObject)(

/* [in] */ IDataObject __RPC_FAR *pDO,

/* [out] */ IDataObject __RPC_FAR *__RPC_FAR *ppDORet);

END_INTERFACE_PART(DocHostUIHandler)

};

class CCustomOccManager :public COccManager

{

public:

CCustomOccManager(){}

COleControlSite* CreateSite(COleControlContainer* pCtrlCont)

{

CCustomControlSite *pSite = new CCustomControlSite(pCtrlCont);

return pSite;

}

};

// .cpp

BEGIN_INTERFACE_MAP(CCustomControlSite, COleControlSite)

INTERFACE_PART(CCustomControlSite, IID_IDocHostShowUI, DocHostShowUI)

INTERFACE_PART(CCustomControlSite, IID_IDocHostUIHandler, DocHostUIHandler)

END_INTERFACE_MAP()

ULONG CCustomControlSite::XDocHostShowUI::AddRef()

{

METHOD_PROLOGUE(CCustomControlSite, DocHostShowUI);

return pThis->ExternalAddRef();

}

ULONG CCustomControlSite::XDocHostShowUI::Release()

{

METHOD_PROLOGUE(CCustomControlSite, DocHostShowUI);

return pThis->ExternalRelease();

}

HRESULT CCustomControlSite::XDocHostShowUI::QueryInterface(REFIID riid, void ** ppvObj)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostShowUI);

return pThis->ExternalQueryInterface( &riid, ppvObj );

}

HRESULT CCustomControlSite::XDocHostShowUI::ShowHelp(HWND hwnd,

LPOLESTR pszHelpFile,

UINT nCommand,

DWORD dwData,

POINT ptMouse,

IDispatch * pDispatchObjectHit)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostShowUI);

return S_OK;

}

HRESULT CCustomControlSite::XDocHostShowUI::ShowMessage(HWND hwnd,

LPOLESTR lpstrText,

LPOLESTR lpstrCaption,

DWORD dwType,

LPOLESTR lpstrHelpFile,

DWORD dwHelpContext,

LRESULT * plResult)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostShowUI);

MessageBox(hwnd, (CString)lpstrText, _T("Cpp & JavaScript"), /*dwType*/MB_ICONWARNING);

return S_OK;

}

ULONG FAR EXPORT CCustomControlSite::XDocHostUIHandler::AddRef()

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return pThis->ExternalAddRef();

}

ULONG FAR EXPORT CCustomControlSite::XDocHostUIHandler::Release()

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return pThis->ExternalRelease();

}

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::QueryInterface(REFIID riid, void **ppvObj)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

HRESULT hr = (HRESULT)pThis->ExternalQueryInterface(&riid, ppvObj);

return hr;

}

// * CImpIDocHostUIHandler::GetHostInfo

// *

// * Purpose: Called at initialization

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::GetHostInfo( DOCHOSTUIINFO* pInfo )

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

pInfo->dwFlags = DOCHOSTUIFLAG_NO3DBORDER;

pInfo->dwDoubleClick = DOCHOSTUIDBLCLK_DEFAULT;

return S_OK;

}

// * CImpIDocHostUIHandler::ShowUI

// *

// * Purpose: Called when MSHTML.DLL shows its UI

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::ShowUI(

DWORD dwID,

IOleInPlaceActiveObject * /*pActiveObject*/,

IOleCommandTarget * pCommandTarget,

IOleInPlaceFrame * /*pFrame*/,

IOleInPlaceUIWindow * /*pDoc*/)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

// We've already got our own UI in place so just return S_OK

return S_OK;

}

// * CImpIDocHostUIHandler::HideUI

// *

// * Purpose: Called when MSHTML.DLL hides its UI

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::HideUI(void)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return S_OK;

}

// * CImpIDocHostUIHandler::UpdateUI

// *

// * Purpose: Called when MSHTML.DLL updates its UI

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::UpdateUI(void)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

// MFC is pretty good about updating it's UI in it's Idle loop so I don't do anything here

return S_OK;

}

// * CImpIDocHostUIHandler::EnableModeless

// *

// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::EnableModeless

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::EnableModeless(BOOL /*fEnable*/)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

// * CImpIDocHostUIHandler::OnDocWindowActivate

// *

// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::OnDocWindowActivate

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::OnDocWindowActivate(BOOL /*fActivate*/)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

// * CImpIDocHostUIHandler::OnFrameWindowActivate

// *

// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::OnFrameWindowActivate

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::OnFrameWindowActivate(BOOL /*fActivate*/)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

// * CImpIDocHostUIHandler::ResizeBorder

// *

// * Purpose: Called from MSHTML.DLL's IOleInPlaceActiveObject::ResizeBorder

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::ResizeBorder(

LPCRECT /*prcBorder*/,

IOleInPlaceUIWindow* /*pUIWindow*/,

BOOL /*fRameWindow*/)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

// * CImpIDocHostUIHandler::ShowContextMenu

// *

// * Purpose: Called when MSHTML.DLL would normally display its context menu

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::ShowContextMenu(

DWORD /*dwID*/,

POINT* pptPosition,

IUnknown* /*pCommandTarget*/,

IDispatch* /*pDispatchObjectHit*/)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

// * CImpIDocHostUIHandler::TranslateAccelerator

// *

// * Purpose: Called from MSHTML.DLL's TranslateAccelerator routines

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::TranslateAccelerator(LPMSG lpMsg,

/* [in] */ const GUID __RPC_FAR *pguidCmdGroup,

/* [in] */ DWORD nCmdID)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

//disable F5

if(lpMsg->message == WM_KEYDOWN && GetAsyncKeyState(VK_F5) < 0)

return S_OK;

if(GetKeyState(VK_CONTROL) & 0x8000)

{

//disable ctrl + O

if(lpMsg->message == WM_KEYDOWN && GetAsyncKeyState(0x4F) < 0)

return S_OK;

//disable ctrl + p

if(lpMsg->message == WM_KEYDOWN && GetAsyncKeyState(0x50) < 0)

return S_OK;

//disable ctrl + N

if(lpMsg->message == WM_KEYDOWN && GetAsyncKeyState(0x4E) < 0)

return S_OK;

}

//disable back space

if(lpMsg->wParam == VK_BACK)

return S_OK;

return S_FALSE;

}

// * CImpIDocHostUIHandler::GetOptionKeyPath

// *

// * Purpose: Called by MSHTML.DLL to find where the host wishes to store

// * its options in the registry

// *

HRESULT FAR EXPORT CCustomControlSite::XDocHostUIHandler::GetOptionKeyPath(BSTR* pbstrKey, DWORD)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

STDMETHODIMP CCustomControlSite::XDocHostUIHandler::GetDropTarget(

/* [in] */ IDropTarget __RPC_FAR *pDropTarget,

/* [out] */ IDropTarget __RPC_FAR *__RPC_FAR *ppDropTarget)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

STDMETHODIMP CCustomControlSite::XDocHostUIHandler::GetExternal(

/* [out] */ IDispatch __RPC_FAR *__RPC_FAR *ppDispatch)

{

// return the IDispatch we have for extending the object Model

IDispatch* pDisp = (IDispatch*)theApp.m_pDispOM;

pDisp->AddRef();

*ppDispatch = pDisp;

return S_OK;

}

STDMETHODIMP CCustomControlSite::XDocHostUIHandler::TranslateUrl(

/* [in] */ DWORD dwTranslate,

/* [in] */ OLECHAR __RPC_FAR *pchURLIn,

/* [out] */ OLECHAR __RPC_FAR *__RPC_FAR *ppchURLOut)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

STDMETHODIMP CCustomControlSite::XDocHostUIHandler::FilterDataObject(

/* [in] */ IDataObject __RPC_FAR *pDO,

/* [out] */ IDataObject __RPC_FAR *__RPC_FAR *ppDORet)

{

METHOD_PROLOGUE(CCustomControlSite, DocHostUIHandler)

return E_NOTIMPL;

}

// 修改App

// .h

class CImpIDispatch;

class CXXXApp : public CWinApp

{

CImpIDispatch *m_pDispOM;

}

// .cpp

BOOL CXXXApp::InitInstance()

{

CWinApp::InitInstance();

CCustomOccManager *pMgr = new CCustomOccManager;

// Create an IDispatch class for extending the Dynamic HTML Object Model

m_pDispOM = new CImpIDispatch;

// Set our control containment up but using our control container

// management class instead of MFC's default

AfxEnableControlContainer(pMgr);

}

转载于:https://blog.51cto.com/dlbrant/141445