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C++ ActiveX控件的开发

时间:2014-09-09 11:14:08      阅读:504      评论:0      收藏:0      [点我收藏+]

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最近在做一款局域网的web应用,采用B/S模式,但是其中一个模块需要在网页端做出读写IC卡的操作,如果在后台直接调用读卡器接口只能触发服务器端对读卡器的动作,想要实现在浏览器端直接操作读卡器,就需要自己制作activeX控件,然后在网页前台调用控件的一些方法、属性或事件。

1、创建ActiveX控件项目

 

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输入项目名称,点击确定->完成

查看类视图其中主要用到“工程名Ctrl”类和“工程名Lib”下的“_D工程名”接口

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2、项目配置

右键项目->属性->配置属性->常规:

1)“MFC的使用”选择“在静态库中使用MFC”(如果选择在共享DLL中使用,可能在Win7下无法注册组件);

2)“字符集”选择“未配置”(选择unicode会报无法将char[n]转化为LPCTSTR的编译错误)

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3、添加安全接口(参考http://blog.sina.com.cn/s/blog_5d154c460100f8z9.html)

在"工程名Ctrl.h"文件中添加头文件

#include <objsafe.h>

查找DECLARE_DYNCREATE(工程名Ctrl)

在其后添加如下代码

DECLARE_INTERFACE_MAP()
 BEGIN_INTERFACE_PART(ObjSafe, IObjectSafety)
  STDMETHOD_(HRESULT, GetInterfaceSafetyOptions) (
            REFIID riid,
            DWORD __RPC_FAR *pdwSupportedOptions,
            DWORD __RPC_FAR *pdwEnabledOptions
  );
       
        STDMETHOD_(HRESULT, SetInterfaceSafetyOptions) (
            REFIID riid,
            DWORD dwOptionSetMask,
            DWORD dwEnabledOptions

打开"工程名Ctrl.cpp"查找

BOOL C工程名Ctrl::C工程名CtrlFactory::UpdateRegistry(BOOL bRegister)
{
 // TODO: Verify that your control follows apartment-model threading rules.
 // Refer to MFC TechNote 64 for more information.
 // If your control does not conform to the apartment-model rules, then
 // you must modify the code below, changing the 6th parameter from
 // afxRegApartmentThreading to 0.
 if (bRegister)
  return AfxOleRegisterControlClass(
   AfxGetInstanceHandle(),
   m_clsid,
   m_lpszProgID,
   IDS_工程名,  //这里的工程名必须为大写
   IDB_工程名,  //这里的工程名必须为大写
   afxRegApartmentThreading,
   _dwGetLocalOleMisc,
   _tlid,
   _wVerMajor,
   _wVerMinor);
 else
  return AfxOleUnregisterClass(m_clsid, m_lpszProgID);
}

将此段代码替换为

// Interface map for IObjectSafety
BEGIN_INTERFACE_MAP( C工程名Ctrl, COleControl )
 INTERFACE_PART(C工程名Ctrl, IID_IObjectSafety, ObjSafe)
END_INTERFACE_MAP()
/////////////////////////////////////////////////////////////////////////////
// IObjectSafety member functions
// Delegate AddRef, Release, QueryInterface
ULONG FAR EXPORT C工程名Ctrl::XObjSafe::AddRef()
{
    METHOD_PROLOGUE(C工程名Ctrl, ObjSafe)
    return pThis->ExternalAddRef();
}
ULONG FAR EXPORT C工程名Ctrl::XObjSafe::Release()
{
    METHOD_PROLOGUE(C工程名Ctrl, ObjSafe)
    return pThis->ExternalRelease();
}
HRESULT FAR EXPORT C工程名Ctrl::XObjSafe::QueryInterface(
    REFIID iid, void FAR* FAR* ppvObj)
{
    METHOD_PROLOGUE(C工程名Ctrl, ObjSafe)
    return (HRESULT)pThis->ExternalQueryInterface(&iid, ppvObj);
}
const DWORD dwSupportedBits =
  INTERFACESAFE_FOR_UNTRUSTED_CALLER |
  INTERFACESAFE_FOR_UNTRUSTED_DATA;
const DWORD dwNotSupportedBits = ~ dwSupportedBits;
 
/////////////////////////////////////////////////////////////////////////////
// CStopLiteCtrl::XObjSafe::GetInterfaceSafetyOptions
// Allows container to query what interfaces are safe for what. We‘re
// optimizing significantly by ignoring which interface the caller is
// asking for.
HRESULT STDMETHODCALLTYPE
 C工程名Ctrl::XObjSafe::GetInterfaceSafetyOptions(
  REFIID riid,
        DWORD __RPC_FAR *pdwSupportedOptions,
        DWORD __RPC_FAR *pdwEnabledOptions)
{
 METHOD_PROLOGUE(C工程名Ctrl, ObjSafe)
 HRESULT retval = ResultFromScode(S_OK);
 // does interface exist?
 IUnknown FAR* punkInterface;
 retval = pThis->ExternalQueryInterface(&riid,
     (void * *)&punkInterface);
 if (retval != E_NOINTERFACE) { // interface exists
  punkInterface->Release(); // release it--just checking!
 }
 
 // we support both kinds of safety and have always both set,
 // regardless of interface
 *pdwSupportedOptions = *pdwEnabledOptions = dwSupportedBits;
 return retval; // E_NOINTERFACE if QI failed
}
/////////////////////////////////////////////////////////////////////////////
// CStopLiteCtrl::XObjSafe::SetInterfaceSafetyOptions
// Since we‘re always safe, this is a no-brainer--but we do check to make
// sure the interface requested exists and that the options we‘re asked to
// set exist and are set on (we don‘t support unsafe mode).
HRESULT STDMETHODCALLTYPE
 C工程名Ctrl::XObjSafe::SetInterfaceSafetyOptions(
        REFIID riid,
        DWORD dwOptionSetMask,
        DWORD dwEnabledOptions)
{
    METHOD_PROLOGUE(C工程名Ctrl, ObjSafe)
 
 // does interface exist?
 IUnknown FAR* punkInterface;
 pThis->ExternalQueryInterface(&riid, (void * *)&punkInterface);
 if (punkInterface) { // interface exists
  punkInterface->Release(); // release it--just checking!
 }
 else { // interface doesn‘t exist
  return ResultFromScode(E_NOINTERFACE);
 }
 // can‘t set bits we don‘t support
 if (dwOptionSetMask & dwNotSupportedBits) {
  return ResultFromScode(E_FAIL);
 }
 
 // can‘t set bits we do support to zero
 dwEnabledOptions &= dwSupportedBits;
 // (we already know there are no extra bits in mask )
 if ((dwOptionSetMask & dwEnabledOptions) !=
   dwOptionSetMask) {
  return ResultFromScode(E_FAIL);
 }       
 
 // don‘t need to change anything since we‘re always safe
 return ResultFromScode(S_OK);
}
/////////////////////////////////////////////////////////////////////////////
// C工程名Ctrl::C工程名CtrlFactory::UpdateRegistry -
// Adds or removes system registry entries for C工程名Ctrl
BOOL C工程名Ctrl::C工程名CtrlFactory::UpdateRegistry(BOOL bRegister)
{
 // TODO: Verify that your control follows apartment-model threading rules.
 // Refer to MFC TechNote 64 for more information.
 // If your control does not conform to the apartment-model rules, then
 // you must modify the code below, changing the 6th parameter from
 // afxRegApartmentThreading to 0.
 if (bRegister)
  return AfxOleRegisterControlClass(
   AfxGetInstanceHandle(),
   m_clsid,
   m_lpszProgID,
   IDS_工程名, //这里的工程名为大写
   IDB_工程名, //这里的工程名为大写
   afxRegApartmentThreading,
   _dw工程名OleMisc,
   _tlid,
   _wVerMajor,
   _wVerMinor);
 else
  return AfxOleUnregisterClass(m_clsid, m_lpszProgID);
}

如果跳过此步,网页调用时会出现“对象不支持此属性或方法”的错误

 4、添加方法属性

1)添加方法:在类视图中右键“工程名Lib”下的“_D工程名”添加方法,弹出添加方法向导,设置好方法名称参数后,在类视图中可以看到“工程名Ctrl”类下刚才添加的方法,双击方法名,在如下位置添加方法的实现代码

void CZX_fakaCtrl::CardIDChanged(void)
{
    AFX_MANAGE_STATE(AfxGetStaticModuleState());

    // TODO: 在此添加属性处理程序代码

    SetModifiedFlag();
}

2)添加属性:因为读卡需要把读到的卡号传给网页前台,但是本人不知道如何给控件方法传递引用参数,所以就将卡号赋给属性,让前台直接读取控件的属性,跟添加方法类似,在添加属性向导设置属性类型名称,这里设置为BSTR CardID,实现类型选择“get/set方法”。打开“工程名Ctrl.h”文件找到声明的protected变量位置,添加CString m_cardID变量,在“工程名Ctrl”类下找到此属性的get()方法,修改返回值return m_cardID.AllocSysString();,其中在读卡方法中对m_cardID进行赋值

BSTR CZX_fakaCtrl::GetCardID(void)
{
    AFX_MANAGE_STATE(AfxGetStaticModuleState());

    CString strResult;

    // TODO: 在此添加调度处理程序代码

    return m_cardID.AllocSysString();
}

(参考http://msdn.microsoft.com/zh-cn/library/cc451425(v=vs.71).aspx)

生成ocx文件,到此一个简单的activeX控件完成

5、在网页进行测试

注册组件:在cmd下利用regsvr32命令注册(注意一些读卡器DLL文件要跟ocx文件放在同一文件夹下)

在网页中添加此控件,其中clsid为控件类的GUID值,在.idl文件中“//  C工程名Ctrl 的类信息”后可以找到

<OBJECT id="ReadcardControl"
 classid="clsid:25717798-8BF4-4601-96A4-965C7296C733">
</OBJECT>

利用js调用控件的方法

<script type="javascript#text">
function readCard(){
    var rcc=document.getElementById("ReadcardControl")
    var a=rcc.readCardID();
    var b=rcc.CardID
    alert("函数返回:"+a+"\n卡号:"+b);
}
</script>

 

C++ ActiveX控件的开发

标签:style   blog   http   color   os   io   使用   java   ar   

原文地址:http://www.cnblogs.com/helloclc/p/3959858.html

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