开发ActiveX控件

Question

我想开发一个ActiveX控件,因为我没有自己的visual studio,我想知道我是否可以自己使用VisualC++ express版本,还是我还需要Windows Platform SDK？

Answer 1

您不需要Visual Studio来编写Active X控件.Active X控件只是一个COM对象,它以实现IUnknown和IObjectSafety的特定方式注册.

您不需要创建Visual Studio Active X项目.您可以创建一个普通的DLL,添加适当的清单并使用CAB SDK工具对其进行操作.

您不必使用ATL来编写Active X控件.实际上,在了解OLE接口如何在IE扩展性模型中工作之前,最好不要使用它.

所以是的,你可以使用Visual Studio Express.

编辑:

• 您应该从Active X Controls简介开始.
• 这是CAB SDK.
• 通过搜索谷歌等,您应该没有问题找到基本ActiveX控件的示例.

这是一个示例清单,名为YOURCONTROL.inf.显然用你叫你的家伙取代YOURCONTROL,并生成你自己的GUID和版本号.这是您需要的最低清单.

[version]
signature="$CHICAGO$"
AdvancedINF=2.0

[Add.Code]
YOURCONTROL.dll=YOURCONTROL.dll

[YOURCONTROL.dll]
file-win32-x86=thiscab
clsid={11111111-2222-3333-4444-555555555555}
FileVersion=1,2,3,4567
RegisterServer=yes

您需要在项目中使用标准的.DEF文件,该文件列出了COM和自行注册所需的导出函数.DllGetClassObject是COM将调用您获取COM对象的类工厂的地方.RegisterServer和UnregisterServer是您应该将初始状态写入注册表的位置(例如,您的COM对象注册等).

EXPORTS
    DllCanUnloadNow             PRIVATE
    DllGetClassObject   PRIVATE
    DllRegisterServer   PRIVATE
    DllUnregisterServer PRIVATE

您也需要一个IDL文件,因此您可以定义COM对象的dispinterface,以便可以从脚本调用它,因此它可以向Javascript触发事件.像这样的东西:

import "oaidl.idl";
import "ocidl.idl";

#include "dispids.h"  // <-- define your DISPIDs here

[
        uuid(<<generate your own guid here>>),
        version(1.0),
]
library YOURCONTROLLIBRARY
{
    [
        uuid(<<generate your own guid here>>),
        hidden
    ]
    dispinterface DYOURCONTROLEvents
    {
        properties:
        methods:
        // Add outgoing events here.
        [id(DISPID_SOME_EVENT)]  void SomeEvent();
    }

    [
        dual,
        uuid(<<generate your own guid here>>)
    ]
    interface IYOURCONTROL : IDispatch
    {
        // Add methods and properties here.
        [id(DISPID_SOMEMETHOD)] HRESULT SomeMethod([in] BSTR bstrFoo);
    }

    [
        uuid(<<generate your own guid here>>)
    ]
    coclass YOURCONTROLCtl
    {
        [default] interface IYOURCONTROL;
        [source, default] dispinterface DYOURCONTROLEvents;
    }
}

最后,您的DLL入口点应如下所示:

HINSTANCE g_hInstance;
LONG g_nDllRefs;

extern "C"
BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved) {
    switch (dwReason) {
        case DLL_PROCESS_ATTACH:
            g_hInstance = hInstance;
            g_nDllRefs = 0;
            break;

        case DLL_PROCESS_DETACH:
            break;
    }

    return true;
}

// Call this whenever you create your object to keep your DLL loaded.
void DllAddRef() {
    InterlockedIncrement(&g_nDllRefs);
}

// Call this when your object is destroyed.
void DllRelease() {
    InterlockedDecrement(&g_nDllRefs);
}

STDAPI DllCanUnloadNow() {
    return (g_nDllRefs == 0 ? S_OK : S_FALSE);
}

// This is where you create your class factory.  See the IClassFactory documentation on msdn.
STDAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID* ppv) {
    HRESULT hr;
    if (rclsid == CLSID_YOUROBJECTCtl) {
        CYOUROBJECTFactory *pYOUROBJECTFactory = new CYOUROBJECTFactory;
        if (pYOUROBJECTFactory == NULL) {
            hr = E_OUTOFMEMORY;
        } else {
            hr = pYOUROBJECTFactory ->QueryInterface(riid, ppv);
        }
    } else {
        hr = CLASS_E_CLASSNOTAVAILABLE;
    }
    return hr;
}

STDAPI DllRegisterServer() {
    // Write your registry keys for registering your ActiveX COM Object here.
    return S_OK;
}

STDAPI DllUnregisterServer() {
    // Delete your registry keys here.
    return S_OK;
}