Creating Icon Overlay Handlers / 创建图标标记 Handlers (续) / VC++, Windows, DLL, ATL, COM

创建图标标记 Handlers (续)

 

1、新建一个ATL Project。

2、建议将 Project Property 中 Linker – General - “Register Output” 设为 no，C/C++ - “Code Generation” - “Runtime Library” 设为 /MTd。

3、在 Solution Explorer 中右键 Add Class，选择 ATL Simple Object。并在弹出的对话框中为该 Class 命名。

4、添加完成后建议 Build 一下 Project，MIDL compiler 将根据 .idl 文件生成 IIDs and CLSIDs。

5、切换到新增 Class 的 .h 文件中，使其继承接口 IShellIconOverlayIdentifier。

 1 // MyOverlay.h : Declaration of the CMyOverlay
 2 
 3 #pragma once
 4 #include "resource.h"       // main symbols
 5 
 6 
 7 
 8 #include "Example_i.h"
 9 #include <ShlObj.h>
10 
11 
12 
13 #if defined(_WIN32_WCE) && !defined(_CE_DCOM) && !defined(_CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA)
14 #error "Single-threaded COM objects are not properly supported on Windows CE platform, such as the Windows Mobile platforms that do not include full DCOM support. Define _CE_ALLOW_SINGLE_THREADED_OBJECTS_IN_MTA to force ATL to support creating single-thread COM object's and allow use of it's single-threaded COM object implementations. The threading model in your rgs file was set to 'Free' as that is the only threading model supported in non DCOM Windows CE platforms."
15 #endif
16 
17 using namespace ATL;
18 
19 
20 // CMyOverlay
21 
22 class ATL_NO_VTABLE CMyOverlay :
23     public CComObjectRootEx<CComSingleThreadModel>,
24     public CComCoClass<CMyOverlay, &CLSID_MyOverlay>,
25     public IDispatchImpl<IMyOverlay, &IID_IMyOverlay, &LIBID_ExampleLib, 
26     /*wMajor =*/ 1, /*wMinor =*/ 0>,
27     public IShellIconOverlayIdentifier
28 {
29 public:
30     CMyOverlay()
31     {
32     }
33 
34 DECLARE_REGISTRY_RESOURCEID(IDR_MYOVERLAY)
35 
36 
37 BEGIN_COM_MAP(CMyOverlay)
38     COM_INTERFACE_ENTRY(IMyOverlay)
39     COM_INTERFACE_ENTRY(IDispatch)
40     COM_INTERFACE_ENTRY(IShellIconOverlayIdentifier)
41 END_COM_MAP()
42 
43 
44 
45     DECLARE_PROTECT_FINAL_CONSTRUCT()
46 
47 
48     HRESULT FinalConstruct()
49     {
50         return S_OK;
51     }
52 
53     void FinalRelease()
54     {
55     }
56 
57 public:
58     STDMETHOD(IsMemberOf)(THIS_ _In_ PCWSTR pwszPath, DWORD dwAttrib);
59     STDMETHOD(GetOverlayInfo)(THIS_ _Out_writes_(cchMax) PWSTR pwszIconFile,
60         int cchMax, _Out_ int * pIndex, _Out_ DWORD * pdwFlags);
61     STDMETHOD(GetPriority)(THIS_ _Out_ int * pIPriority);
62 
63 };
64 
65 OBJECT_ENTRY_AUTO(__uuidof(MyOverlay), CMyOverlay)

MyOverlay.h