214 lines
7.5 KiB
C++
214 lines
7.5 KiB
C++
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//+---------------------------------------------------------------------
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//
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// File: clsdesc.cxx
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//
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// Contents: ClassDescriptor implementation
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//
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//------------------------------------------------------------------------
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//[ classdescriptor_overview
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/*
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ClassDescriptor Overview
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A ClassDescriptor is a structure the contains global, static information
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about an OLE Compound Document class. Having a ClassDescriptor allows
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the base classes to do a lot of work on behalf of the derived class because
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it can get information it needs from the ClassDescriptor instead of resorting
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to virtual method calls. A single ClassDescriptor is shared by all object
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instances of that Compound Document class.
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A ClassDescriptor has three conceptual parts. The first part is a collection
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of information loaded from resources. This includes strings, menus, accelerators,
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and an icon. The second part is a pair of verb tables that are used to implement
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IOleObject::DoVerb. The third part is two pairs of format tables that are
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used to implement many of the Get/Set/Query methods on IDataObject.
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Each of these parts has its own initialization method to prepare that part of
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the class descriptor.
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The ClassDescriptor is usually associated with the ClassFactory.
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*/
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//]
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#include "headers.hxx"
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#pragma hdrstop
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#define MAX_USERTYPE_LEN 64
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//+---------------------------------------------------------------
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//
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// Member: ClassDescriptor::ClassDescriptor
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//
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// Synopsis: Constructor for ClassDescriptor structure
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//
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// Notes: A DLL (in-process) server should allocate the class
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// descriptor at library initialization time and allocate
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// it in shared memory (GMEM_SHARE flag with GlobalAlloc, or
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// the OLE shared allocator, MEMCTX_SHARED).
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//
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// The constructor ensures all members of the structure
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// are initialized to NULL
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//
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//----------------------------------------------------------------
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ClassDescriptor::ClassDescriptor(void)
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{
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// initialize everything to NULL
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// ZeroMemory(this, sizeof(ClassDescriptor));
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memset(this, 0, sizeof(ClassDescriptor));
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}
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//+---------------------------------------------------------------
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//
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// Member: ClassDescriptor::Init
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//
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// Synopsis: Initializes a class descriptor structure from resources
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//
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// Arguments: [hinst] -- instance handle of module with resources used
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// to initialize the class descriptor
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//
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// Returns: TRUE iff the class descriptor was successfully initialized
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//
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// Notes: This method only fills in the part of the class descriptor
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// that can be initialized from resources. The other part
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// that requires initialization are the verb and format tables.
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//
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// Objects that are concerned about resource load times could
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// not use this initialization method and fill in fields of the
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// class descriptor directly.
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//
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//----------------------------------------------------------------
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BOOL ClassDescriptor::Init(HINSTANCE hinst, WORD wBaseID)
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{
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//REVIEW: Currently, information loaded from resources is duplicated
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//REVIEW: in the registration database. We could
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//REVIEW: (1) load this stuff from the reg db instead (except CLSID), or
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//REVIEW: (2) do an autoregistration feature where the reg db is filled
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//REVIEW: in from the class descriptor information loaded from resources
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//REVIEW: We could also support loading the verb and format tables
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//REVIEW: from resources/regdb as well.
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_hinst = hinst;
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_wBaseResID = wBaseID;
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// load our class id string and convert it into our real class id
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TCHAR szClsId[40];
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ZeroMemory (szClsId, sizeof (szClsId));
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LoadString(hinst, wBaseID+IDOFF_CLASSID, szClsId, ARRAY_SIZE(szClsId));
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#if !defined(UNICODE) && !defined(OLE2ANSI)
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LPOLESTR lpostr = ConvertMBToOLESTR(szClsId,-1);
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BOOL fRet = OK(CLSIDFromString(lpostr, &_clsid));
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TaskFreeMem(lpostr);
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#else
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BOOL fRet = OK(CLSIDFromString(szClsId, &_clsid));
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#endif
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// load our in-place menus and accelerators
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_hicon = LoadIcon(hinst, MAKEINTRESOURCE(wBaseID+IDOFF_ICON));
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_haccel = (HACCEL)LoadAccelerators(hinst,
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MAKEINTRESOURCE(wBaseID+IDOFF_ACCELS));
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LoadResourceData(hinst,
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MAKEINTRESOURCE(wBaseID+IDOFF_MGW),
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&_mgw,
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sizeof(_mgw));
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LoadResourceData(hinst,
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MAKEINTRESOURCE(wBaseID+IDOFF_MISCSTATUS),
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&_dwMiscStatus,
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sizeof(_dwMiscStatus));
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#if !defined(UNICODE) && !defined(OLE2ANSI)
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CHAR szUserClassType[MAX_USERTYPE_LEN];
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#define SetWideClassType(y,x) \
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MultiByteToWideChar(CP_ACP \
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, 0 \
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, (y) \
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, -1 \
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, _szUserClassType[(x)] \
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, ARRAY_SIZE(_szUserClassType[(x)]))
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LoadString(hinst
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, wBaseID+IDOFF_USERTYPEFULL
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, szUserClassType
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, MAX_USERTYPE_LEN);
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SetWideClassType(szUserClassType,USERCLASSTYPE_FULL);
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LoadString(hinst
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, wBaseID+IDOFF_USERTYPESHORT
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, szUserClassType
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, MAX_USERTYPE_LEN);
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SetWideClassType(szUserClassType,USERCLASSTYPE_SHORT);
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LoadString(hinst
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, wBaseID+IDOFF_USERTYPEAPP
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, szUserClassType
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, MAX_USERTYPE_LEN);
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SetWideClassType(szUserClassType,USERCLASSTYPE_APPNAME);
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LoadString(hinst
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, wBaseID+IDOFF_DOCFEXT
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, szUserClassType
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, MAX_USERTYPE_LEN);
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MultiByteToWideChar(CP_ACP
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, 0
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, szUserClassType
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, -1
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, _szDocfileExt
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, ARRAY_SIZE(_szDocfileExt));
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#else
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LoadString(hinst
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, wBaseID+IDOFF_USERTYPEFULL
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, _szUserClassType[USERCLASSTYPE_FULL]
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, ARRAY_SIZE(_szUserClassType[USERCLASSTYPE_FULL]));
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LoadString(hinst
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, wBaseID+IDOFF_USERTYPESHORT
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, _szUserClassType[USERCLASSTYPE_SHORT]
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, ARRAY_SIZE(_szUserClassType[USERCLASSTYPE_SHORT]));
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LoadString(hinst
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, wBaseID+IDOFF_USERTYPEAPP
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, _szUserClassType[USERCLASSTYPE_APPNAME]
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, ARRAY_SIZE(_szUserClassType[USERCLASSTYPE_APPNAME]));
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LoadString(hinst
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, wBaseID+IDOFF_DOCFEXT
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, _szDocfileExt
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, ARRAY_SIZE(_szDocfileExt));
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#endif
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return fRet;
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}
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//+---------------------------------------------------------------
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//
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// Member: ClassDescriptor::LoadMenu, public
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//
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// Synopsis: Loads a copy of the menus for the server
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//
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// Notes: A single copy of the menu cannot be shared by all
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// instances of the class, like an accelerator table can.
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// This is because the menu is not a read-only resource
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// (e.g. you can "check" a menu item and merge in verb
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// menu items). Therefore each class instance must load
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// its own copy of the menu. This LoadMenu call is used
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// for that purpose.
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//
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//---------------------------------------------------------------
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HMENU
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ClassDescriptor::LoadMenu(void)
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{
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return ::LoadMenu(_hinst, MAKEINTRESOURCE(_wBaseResID+IDOFF_MENU));
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}
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