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68 lines
2.1 KiB
68 lines
2.1 KiB
//===========================================================================
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//
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// Copyright (c) Microsoft Corporation 1991-1998
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//
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// File: shlobj.h
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//
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//===========================================================================
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//;begin_both
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#ifndef RC_INVOKED
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#pragma pack(1) /* Assume byte packing throughout */
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#endif /* !RC_INVOKED */
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#ifdef __cplusplus
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extern "C" { /* Assume C declarations for C++ */
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#endif /* __cplusplus */
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//;end_both
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// --- IExtractImage
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//-------------------------------------------------------------------------
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//
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// IThumbnail interface
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//
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//
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// [Member functions]
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//
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// IThumbnail::Init(HWND hwnd, UINT uMsg)
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// Must initialize interface before use. The hwnd given will receive the
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// uMsg message when the bitmap is computed (cf. GetBitmap()).
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//
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// IThumbnail::GetBitmap(LPCWSTR pwszFile, DWORD dwItem, LONG lWidth, LONG lHeight)
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// Call this function to actually compute and return the bitmap. pszFile is
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// the file UNC whose bitmap is to be computed. lWidth and lHeight are the
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// width and height respectively of the rectangle containing the thumbnail,
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// i.e. the size of the resultant bitmap. When the bitmap is computed, the
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// uMsg is sent to the hwnd (cf. Init()) where LPARAM is the HBITMAP, and
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// WPARAM is dwItem (so it's an ID to identify the bitmap).
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// NOTE: Call GetBitmap(NULL,...) to cancel any pending requests.
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//
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//-------------------------------------------------------------------------
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#undef INTERFACE
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#define INTERFACE IThumbnail
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DECLARE_INTERFACE_(IThumbnail, IUnknown)
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{
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// *** IUnknown methods ***
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STDMETHOD(QueryInterface) (THIS_ REFIID riid, LPVOID *ppvObj) PURE;
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STDMETHOD_(ULONG, AddRef) (THIS) PURE;
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STDMETHOD_(ULONG, Release) (THIS) PURE;
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// *** IThumbnail specific methods ***
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STDMETHOD(Init) (THIS_ HWND hwnd, UINT uMsg) PURE;
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STDMETHOD(GetBitmap) (THIS_ LPCWSTR wszFile, DWORD dwItem, LONG lWidth, LONG lHeight) PURE;
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};
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//;begin_both
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#ifndef RC_INVOKED
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#pragma pack()
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#endif /* !RC_INVOKED */
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//;end_both
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