WinCE 界面开发:使用HTML Viewer Control

在Win32平台上用 C++做界面开发确实是很吃力的活。无论使用MFC还是ATL或者WTL都是很痛苦的。通常引入HTML控件，可以做出类似网页效果的精美布局。在传统的Windows应用程序中使用Web控件已是大势所趋，大大简化工作量。但是在WinCE平台上，做同样的事情，往往遇到很多困难。我自己摸索了半天，总结出下面的方法，效果还是很好的。

首先，使用WTL（WTL8.0 with VS2005）创建Windows Mobile 6的程序，选择新建项目ceWtl->WTL Mobile Application Wizard。

Platforms选择：Windows Mobile 6 Professional SDK。

Application Type：默认。

User Interface Features：勾选Use a view window，view type 选择Html Browser Control。

按Finish。

我仅修改默认生成的CeWtlFrame.h文件如下：

//cheungmine{{

我增加的部分

//cheungmine}}

// CeWtlFrame.h : interface of the CCeWtlFrame class
//
/////////////////////////////////////////////////////////////////////////////

#pragma once

//cheungmine{{
/**
OLEMethod
OLEMethod receives variable parameters. I.e., you can pass any number of parameters
depending on the property/method. Following is a summary of the OLEMethod() parameters,
* nType – Type of call to make, which can be any of the following values:
DISPATCH_PROPERTYPUT - Set property value
DISPATCH_PROPERTYGET - Get property value
DISPATCH_METHOD - Call a method
* pvResult – Return value for the call made; it can be another IDispatch object,
or an integer value, or a boolean, or so on..
* pDisp – IDispatch interface object for which the call is to be made.
* ptName – Property or method name.
* cArgs – Number of arguments followed after this parameter.
* … parameters in reverse order for the call (it can be values of a property, or
parameters of a method for the IDispatch object).

See also:
MS Office OLE Automation Using C++ By Naren Neelamegam
A simple guide to automate MS Word and MS Excel using C++.

http://www.codeproject.com/KB/office/MSOfficeAuto.aspx
*/
static HRESULT OLEMethod(int nType,
VARIANT *pvResult,
IDispatch *pDisp,
LPOLESTR ptName,
int cArgs...)
{
if(!pDisp) return E_FAIL;

va_list marker;
va_start(marker, cArgs);

DISPPARAMS dp = { NULL, NULL, 0, 0 };
DISPID dispidNamed = DISPID_PROPERTYPUT;
DISPID dispID;
char szName[200];

// Convert down to ANSI
WideCharToMultiByte(CP_ACP, 0, ptName, -1, szName, 256, NULL, NULL);

// Get DISPID for name passed...
HRESULT hr= pDisp->GetIDsOfNames(IID_NULL, &ptName, 1,
LOCALE_USER_DEFAULT, &dispID);
if(FAILED(hr)) {
return hr;
}
// Allocate memory for arguments...
VARIANT *pArgs = new VARIANT[cArgs+1];
// Extract arguments...
for(int i=0; i<cArgs; i++) {
pArgs[i] = va_arg(marker, VARIANT);
}

// Build DISPPARAMS
dp.cArgs = cArgs;
dp.rgvarg = pArgs;

// Handle special-case for property-puts!
if(nType & DISPATCH_PROPERTYPUT) {
dp.cNamedArgs = 1;
dp.rgdispidNamedArgs = &dispidNamed;
}

// Make the call!
hr = pDisp->Invoke(dispID, IID_NULL, LOCALE_SYSTEM_DEFAULT,
nType, &dp, pvResult, NULL, NULL);
if(FAILED(hr)) {
return hr;
}

// End variable-argument section...
va_end(marker);
delete [] pArgs;
return hr;
}
//cheungmine}}

class CCeWtlFrame :
public CFrameWindowImpl<CCeWtlFrame>,
public CUpdateUI<CCeWtlFrame>,
public CAppWindow<CCeWtlFrame>,
public CMessageFilter, public CIdleHandler
{
public:
DECLARE_APP_FRAME_CLASS(NULL, IDR_MAINFRAME, L"Software//WTL//CeWtl")

CCeWtlView m_view;

virtual BOOL PreTranslateMessage(MSG* pMsg)
{
if(CFrameWindowImpl<CCeWtlFrame>::PreTranslateMessage(pMsg))
return TRUE;

return m_view.IsWindow() ? m_view.PreTranslateMessage(pMsg) : FALSE;
}

// CAppWindow operations
bool AppHibernate( bool bHibernate)
{
// Insert your code here or delete member if not relevant
return bHibernate;
}

bool AppNewInstance( LPCTSTR lpstrCmdLine)
{
// Insert your code here or delete member if not relevant
return false;
}

void AppSave()
{
CAppInfo info;
// Insert your code here
}

virtual BOOL OnIdle()
{
UIUpdateToolBar();
return FALSE;
}

BEGIN_UPDATE_UI_MAP(CCeWtlFrame)
END_UPDATE_UI_MAP()

BEGIN_MSG_MAP(CCeWtlFrame)
MESSAGE_HANDLER(WM_CREATE, OnCreate)
COMMAND_ID_HANDLER(ID_APP_EXIT, OnFileExit)
COMMAND_ID_HANDLER(ID_FILE_NEW, OnFileNew)
COMMAND_ID_HANDLER(ID_ACTION, OnAction)
COMMAND_ID_HANDLER(ID_APP_ABOUT, OnAppAbout)
CHAIN_MSG_MAP(CAppWindow<CCeWtlFrame>)
CHAIN_MSG_MAP(CUpdateUI<CCeWtlFrame>)
CHAIN_MSG_MAP(CFrameWindowImpl<CCeWtlFrame>)
END_MSG_MAP()

// Handler prototypes (uncomment arguments if needed):
// LRESULT MessageHandler(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
// LRESULT CommandHandler(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
// LRESULT NotifyHandler(int /*idCtrl*/, LPNMHDR /*pnmh*/, BOOL& /*bHandled*/)

LRESULT OnCreate(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
CAppInfo info;

CreateSimpleCEMenuBar();
UIAddToolBar(m_hWndCECommandBar);

m_hWndClient = m_view.Create(m_hWnd, rcDefault, NULL, WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN | HS_CONTEXTMENU);

// register object for message filtering and idle updates
CMessageLoop* pLoop = _Module.GetMessageLoop();
ATLASSERT(pLoop != NULL);
pLoop->AddMessageFilter(this);
pLoop->AddIdleHandler(this);

return 0;
}

LRESULT OnFileExit(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
PostMessage(WM_CLOSE);
return 0;
}

LRESULT OnFileNew(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
// TODO: add code to initialize document

//cheungmine{{
// 文件选择对话框
m_view.AddHTML(L"<input id=/"PathFile/" type=/"file/" />");
//cheungmine}}

return 0;
}

LRESULT OnAction(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
//cheungmine{{
HRESULT hr;
VARIANT varOut;
CComVariant varEmpty;

// 取得 IWebBrowser2 接口
CComPtr<IDispatch> spDispDoc;
m_view.GetDocumentDispatch(&spDispDoc);
ATLASSERT(spDispDoc);

// 取得 IHTMLElementCollection 接口
varOut.vt = VT_DISPATCH;
varOut.pdispVal = 0;
hr = OLEMethod(DISPATCH_PROPERTYGET, &varOut, spDispDoc, L"all", 0);
ATLASSERT(hr==S_OK);

CComPtr<IDispatch> spElemColl;
spElemColl.Attach(varOut.pdispVal);

// 取得指定ID的 IHTMLElement
varOut.vt = VT_DISPATCH;
varOut.pdispVal = 0;
CComBSTR bstrPathFile(L"PathFile");
VARIANT name;
name.vt=VT_BSTR;
name.bstrVal=bstrPathFile.m_str;
hr = OLEMethod(DISPATCH_METHOD, &varOut, spElemColl, L"item", 1, name);
ATLASSERT(hr==S_OK);

CComPtr<IDispatch> spElem;
spElem.Attach(varOut.pdispVal);

// 取得value属性, 存放到bstrPathFile
varOut.vt=VT_BSTR;
varOut.bstrVal=0;
hr = OLEMethod(DISPATCH_PROPERTYGET, &varOut, spElem, L"value", 0);
ATLASSERT(hr==S_OK && varOut.vt==VT_BSTR);
bstrPathFile.Empty();
bstrPathFile.Attach(varOut.bstrVal);

MessageBox( bstrPathFile );
//cheungmine}}

return 0;
}

LRESULT OnAppAbout(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
CAboutDlg dlg;
dlg.DoModal();
return 0;
}
};

编译部署到设备，按Menu->New显示界面。选择一个文件，按Action，跟踪调试，可以看到一起如我们期望那样。

例子代码下载地址：

http://download.csdn.net/source/1984878

本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/cheungmine/archive/2010/01/11/5176124.aspx