COM组件开发实践（三）

前面两篇文章分别介绍了MFC ActiveX应用程序和使用ATL开发ActiveX的简单实例，但还有两个问题需要解决：

1）标记ActiveX控件为安全的控件 2)对控件进行数字签名。本文将结合这两点进行简单的介绍。

Building a Safe ActiveX Control

如何不想办法将控件标记为安全的，就会在Web页面与控件进行交互时出现如下图的警告信息：

下面将分别介绍在MFC ActiveX和ATL中如何标记一个控件为安全的控件。

要标记一个MFC ActiveX控件为安全，可以仿照下面代码修改而得：

// CardScan.cpp : CCardScanApp 和DLL 注册的实现。#include "stdafx.h"#include "CardScan.h"#include "comcat.h"#include "strsafe.h"#include "objsafe.h"CCardScanApp theApp;const GUID CDECL BASED_CODE _tlid =        { 0x29959268, 0x9729, 0x458E, { 0xA8, 0x39, 0xBB, 0x39, 0x2E, 0xCB, 0x7E, 0x37 } };const WORD _wVerMajor = 1;const WORD _wVerMinor = 0;const CATID CLSID_SafeItem ={0xB548F3C7,0x2135,0x4242,{0x92,0x0B,0xA7,0xBD,0xEE,0x6D,0x2B,0xA3}};//{ 0x36299202, 0x9ef, 0x4abf,{ 0xad, 0xb9, 0x47, 0xc5, 0x99, 0xdb, 0xe7, 0x78}};// CCardScanApp::InitInstance - DLL 初始化BOOL CCardScanApp::InitInstance(){    BOOL bInit = COleControlModule::InitInstance();    if (bInit)    {    }    return bInit;}// CCardScanApp::ExitInstance - DLL 终止int CCardScanApp::ExitInstance(){    return COleControlModule::ExitInstance();}HRESULT CreateComponentCategory(CATID catid, CHAR *catDescription){    ICatRegister *pcr = NULL ;    HRESULT hr = S_OK ;    hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr,        NULL, CLSCTX_INPROC_SERVER, IID_ICatRegister, (void**)&pcr);    if (FAILED(hr))        return hr;    // Make sure the HKCR\Component Categories\{..catid}    // key is registered.    CATEGORYINFO catinfo;    catinfo.catid = catid;    catinfo.lcid = 0x0409 ; // english    size_t len;    // Make sure the provided description is not too long.    // Only copy the first 127 characters if it is.    // The second parameter of StringCchLength is the maximum    // number of characters that may be read into catDescription.    // There must be room for a NULL-terminator. The third parameter    // contains the number of characters excluding the NULL-terminator.    hr = StringCchLength(catDescription, STRSAFE_MAX_CCH, &len);    if (SUCCEEDED(hr))    {        if (len>127)        {            len = 127;        }    }    else    {        // TODO: Write an error handler;    }    // The second parameter of StringCchCopy is 128 because you need    // room for a NULL-terminator.    hr = StringCchCopy(COLE2T(catinfo.szDescription), len + 1, catDescription);    // Make sure the description is null terminated.    catinfo.szDescription[len + 1] = '\0';    hr = pcr->RegisterCategories(1, &catinfo);    pcr->Release();    return hr;}// HRESULT RegisterCLSIDInCategory -//      Register your component categories informationHRESULT RegisterCLSIDInCategory(REFCLSID clsid, CATID catid){    // Register your component categories information.    ICatRegister *pcr = NULL ;    HRESULT hr = S_OK ;    hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr,        NULL, CLSCTX_INPROC_SERVER, IID_ICatRegister, (void**)&pcr);    if (SUCCEEDED(hr))    {        // Register this category as being "implemented" by the class.        CATID rgcatid[1] ;        rgcatid[0] = catid;        hr = pcr->RegisterClassImplCategories(clsid, 1, rgcatid);    }    if (pcr != NULL)        pcr->Release();    return hr;}// HRESULT UnRegisterCLSIDInCategory - Remove entries from the registryHRESULT UnRegisterCLSIDInCategory(REFCLSID clsid, CATID catid){    ICatRegister *pcr = NULL ;    HRESULT hr = S_OK ;    hr = CoCreateInstance(CLSID_StdComponentCategoriesMgr,        NULL, CLSCTX_INPROC_SERVER, IID_ICatRegister, (void**)&pcr);    if (SUCCEEDED(hr))    {        // Unregister this category as being "implemented" by the class.        CATID rgcatid[1] ;        rgcatid[0] = catid;        hr = pcr->UnRegisterClassImplCategories(clsid, 1, rgcatid);    }    if (pcr != NULL)        pcr->Release();    return hr;}// DllRegisterServer - 将项添加到系统注册表STDAPI DllRegisterServer(void){    HRESULT hr;    AFX_MANAGE_STATE(_afxModuleAddrThis);    if (!AfxOleRegisterTypeLib(AfxGetInstanceHandle(), _tlid))        return ResultFromScode(SELFREG_E_TYPELIB);    if (!COleObjectFactoryEx::UpdateRegistryAll(TRUE))        return ResultFromScode(SELFREG_E_CLASS);    // Mark the control as safe for initializing.    hr = CreateComponentCategory(CATID_SafeForInitializing,        _T("Controls safely initializable from persistent data!"));    if (FAILED(hr))        return hr;    hr = RegisterCLSIDInCategory(CLSID_SafeItem,        CATID_SafeForInitializing);    if (FAILED(hr))        return hr;    // Mark the control as safe for scripting.    hr = CreateComponentCategory(CATID_SafeForScripting,        _T("Controls safely  scriptable!"));    if (FAILED(hr))        return hr;    hr = RegisterCLSIDInCategory(CLSID_SafeItem,        CATID_SafeForScripting);    if (FAILED(hr))        return hr;    return NOERROR;}// DllUnregisterServer - 将项从系统注册表中移除STDAPI DllUnregisterServer(void){    HRESULT hr;    AFX_MANAGE_STATE(_afxModuleAddrThis);    // Remove entries from the registry.    hr=UnRegisterCLSIDInCategory(CLSID_SafeItem,        CATID_SafeForInitializing);    if (FAILED(hr))        return hr;    hr=UnRegisterCLSIDInCategory(CLSID_SafeItem,        CATID_SafeForScripting);    if (FAILED(hr))        return hr;    if (!AfxOleUnregisterTypeLib(_tlid, _wVerMajor, _wVerMinor))        return ResultFromScode(SELFREG_E_TYPELIB);    if (!COleObjectFactoryEx::UpdateRegistryAll(FALSE))        return ResultFromScode(SELFREG_E_CLASS);    return NOERROR;}

以上是小编为您精心准备的的内容，在的博客、问答、公众号、人物、课程等栏目也有的相关内容，欢迎继续使用右上角搜索按钮进行搜索控件
， return
， if
， hresult
， HR
The
前端组件化开发实践、vue组件化开发实践、com组件开发、vc com组件开发教程、com组件开发教程，以便于您获取更多的相关知识。