Windows编程

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Visual C++

DOC.CPP：源码内容
							//**********************************************************************
// File name: DOC.CPP
//
//      Implementation file for CSimpleDoc.
//
// Functions:
//
//      See DOC.H for Class Definition
//
// Copyright (c) 1992 - 1997 Microsoft Corporation. All rights reserved.
//**********************************************************************
#include "pre.h"
#include "iocs.h"
#include "ias.h"
#include "app.h"
#include "site.h"
#include "doc.h"
#include "idt.h"
#include "dxferobj.h"
//**********************************************************************
//
// CSimpleDoc::Create
//
// Purpose:
//
//      Creation for the CSimpleDoc Class
//
// Parameters:
//
//      CSimpleApp FAR * lpApp  -   Pointer to the CSimpleApp Class
//
//      LPRECT lpRect           -   Client area rect of "frame" window
//
//      HWND hWnd               -   Window Handle of "frame" window
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      StgCreateDocfile            OLE API
//      RegisterDragDrop            OLE API
//      CoLockObjectExternal        OLE API
//      CreateWindow                Windows API
//      ShowWindow                  Windows API
//      UpdateWindow                Windows API
//
// Comments:
//
//      This routine was added so that failure could be returned
//      from object creation.
//
//********************************************************************
CSimpleDoc FAR * CSimpleDoc::Create(CSimpleApp FAR *lpApp, LPRECT lpRect,HWND hWnd)
{
        CSimpleDoc FAR * lpTemp = new CSimpleDoc(lpApp, hWnd);
        if (!lpTemp)
                return NULL;
        // create storage for the doc.
        HRESULT hErr = StgCreateDocfile (
                NULL,       // generate temp name
                STGM_READWRITE | STGM_TRANSACTED | STGM_SHARE_EXCLUSIVE,
                0, &lpTemp->m_lpStorage);
        if (hErr != NOERROR)
                goto error;
        // create the document Window
        lpTemp->m_hDocWnd = CreateWindow(
                        "SimpDndDocWClass",
                        NULL,
                        WS_CHILD | WS_CLIPCHILDREN,
                        lpRect->left,
                        lpRect->top,
                        lpRect->right,
                        lpRect->bottom,
                        hWnd,
                        NULL,
                        lpApp->m_hInst,
                        NULL);
        if (!lpTemp->m_hDocWnd)
                goto error;
        ShowWindow(lpTemp->m_hDocWnd, SW_SHOWNORMAL);  // Show the window
        UpdateWindow(lpTemp->m_hDocWnd);               // Sends WM_PAINT message
        // Ensable InsertObject menu choice
        EnableMenuItem( lpApp->m_hEditMenu, 1, MF_BYPOSITION | MF_ENABLED);
        // Disable Copy menu choice
        EnableMenuItem( lpApp->m_hEditMenu, 0, MF_BYPOSITION | MF_DISABLED | MF_GRAYED);
        // It is *REQUIRED* to hold a strong LOCK on the object that is
        // registered as drop target. this call will result in at least one
        // ref count held on our document. later in CSimpleDoc::Close we will
        // unlock this lock which will make our document's ref count go to 0.
        // when the document's ref count goes to 0, it will be deleted.
        CoLockObjectExternal (&lpTemp->m_DropTarget, TRUE, 0);
        // Register our window as a DropTarget
        RegisterDragDrop(lpTemp->m_hDocWnd, &lpTemp->m_DropTarget);
        lpTemp->m_fRegDragDrop = TRUE;
        return (lpTemp);
error:
        delete (lpTemp);
        return NULL;
}
//**********************************************************************
//
// CSimpleDoc::Close
//
// Purpose:
//
//      Close CSimpleDoc object.
//      when the document's reference count goes to 0, the document
//      will be destroyed.
//
// Parameters:
//
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      RevokeDragDrop              OLE API
//      CoLockObjectExternal        OLE API
//      OleFlushClipboard           OLE API
//      ShowWindow                  Windows API
//
// Comments:
//
//********************************************************************
void CSimpleDoc::Close(void)
{
        OutputDebugString("In CSimpleDoc::Closern");
        CStabilize stabilize(this);
        ShowWindow(m_hDocWnd, SW_HIDE);  // Hide the window
        // Remove our data transfer object from clipboard if it is there.
        //  this will leave HGLOBAL based data behind on the clipboard
        //  including OLE 1.0 compatibility formats.
        OleFlushClipboard();
        // Revoke our window as a DropTarget
        if (m_fRegDragDrop) {
                RevokeDragDrop(m_hDocWnd);
                m_fRegDragDrop = FALSE;
        }
        // Close the OLE object in our document
        if (m_lpSite)
                m_lpSite->CloseOleObject();
        // Unlock the lock added in CSimpleDoc::Create. this will make
        // the document's ref count go to 0, and the document will be deleted.
        CoLockObjectExternal (&m_DropTarget, FALSE, TRUE);
}
//**********************************************************************
//
// CSimpleDoc::CSimpleDoc
//
// Purpose:
//
//      Constructor for the CSimpleDoc Class
//
// Parameters:
//
//      CSimpleApp FAR * lpApp  -   Pointer to the CSimpleApp Class
//
//      HWND hWnd               -   Window Handle of "frame" window
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      OutputDebugString           Windows API
//      GetMenu                     Windows API
//      GetSubMenu                  Windows API
//
// Comments:
//
//********************************************************************
#pragma warning(disable : 4355)  // turn off this warning.  This warning
                                                                // tells us that we are passing this in
                                                                // an initializer, before "this" is through
                                                                // initializing.  This is ok, because
                                                                // we just store the ptr in the other
                                                                // constructor
CSimpleDoc::CSimpleDoc(CSimpleApp FAR * lpApp,HWND hWnd)
                : m_DropTarget(this), m_DropSource(this)
#pragma warning (default : 4355)  // Turn the warning back on
{
        OutputDebugString("In CSimpleDoc's Constructorrn");
        m_lpApp = lpApp;
        m_lpSite = NULL;
        // set up menu handles
        lpApp->m_hMainMenu = GetMenu(hWnd);
        lpApp->m_hFileMenu = GetSubMenu(lpApp->m_hMainMenu, 0);
        lpApp->m_hEditMenu = GetSubMenu(lpApp->m_hMainMenu, 1);
        lpApp->m_hHelpMenu = GetSubMenu(lpApp->m_hMainMenu, 2);
        lpApp->m_hCascadeMenu = NULL;
        m_fModifiedMenu = FALSE;
        // drag/drop related stuff
        m_fRegDragDrop = FALSE;       // is doc registered as drop target?
        m_fLocalDrag = FALSE;         // is doc source of the drag
        m_fLocalDrop = FALSE;         // was doc target of the drop
        m_fCanDropCopy = FALSE;       // is Drag/Drop copy/move possible?
        m_fCanDropLink = FALSE;       // is Drag/Drop link possible?
        m_fDragLeave = FALSE;         // has drag left
        m_fPendingDrag = FALSE;       // LButtonDown--possible drag pending
        m_ptButDown.x = m_ptButDown.y = 0; // LButtonDown coordinates
}
//**********************************************************************
//
// CSimpleDoc::~CSimpleDoc
//
// Purpose:
//
//      Destructor for CSimpleDoc
//
// Parameters:
//
//      None
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      OutputDebugString           Windows API
//      CSimpleSite::Release        SITE.CPP
//      IStorage::Release           OLE API
//
// Comments:
//
//********************************************************************
CSimpleDoc::~CSimpleDoc()
{
        OutputDebugString("In CSimpleDoc's Destructorrn");
        // Release all pointers we hold to the OLE object. also release
        // the ref count added in CSimpleSite::Create. this will make
        // the Site's ref count go to 0, and the Site will be deleted.
        if (m_lpSite) {
                m_lpSite->UnloadOleObject();
                m_lpSite->Release();
                m_lpSite = NULL;
        }
        // Release the Storage
        if (m_lpStorage) {
                m_lpStorage->Release();
                m_lpStorage = NULL;
        }
        // if the edit menu was modified, remove the menu item and
        // destroy the popup if it exists
        if (m_fModifiedMenu)
                {
                int nCount = GetMenuItemCount(m_lpApp->m_hEditMenu);
                RemoveMenu(m_lpApp->m_hEditMenu, nCount-1, MF_BYPOSITION);
                if (m_lpApp->m_hCascadeMenu)
                        DestroyMenu(m_lpApp->m_hCascadeMenu);
                }
        DestroyWindow(m_hDocWnd);
}
//**********************************************************************
//
// CSimpleDoc::QueryInterface
//
// Purpose:
//
//      Return a pointer to a requested interface
//
// Parameters:
//
//      REFIID riid         -   ID of interface to be returned
//      LPVOID FAR* ppvObj  -   Location to return the interface
//
// Return Value:
//
//      S_OK                -   Interface supported
//      E_NOINTERFACE       -   Interface NOT supported
//
// Function Calls:
//      Function                    Location
//
//      OutputDebugString           Windows API
//                   OLE API
//
// Comments:
//
//********************************************************************
STDMETHODIMP CSimpleDoc::QueryInterface(REFIID riid, LPVOID FAR* ppvObj)
{
        OutputDebugString("In CSimpleDoc::QueryInterfacern");
        *ppvObj = NULL;     // must set out pointer parameters to NULL
        // looking for IUnknown
        if ( riid == IID_IUnknown)
                {
                AddRef();
                *ppvObj = this;
                return S_OK;
                }
        // looking for IDropTarget
        if ( riid == IID_IDropTarget)
                {
                m_DropTarget.AddRef();
                *ppvObj=&m_DropTarget;
                return S_OK;
                }
        // looking for IDropSource
        if ( riid == IID_IDropSource)
                {
                m_DropSource.AddRef();
                *ppvObj=&m_DropSource;
                return S_OK;
                }
        // Not a supported interface
        return E_NOINTERFACE;
}
//**********************************************************************
//
// CSimpleDoc::AddRef
//
// Purpose:
//
//      Increments the document reference count
//
// Parameters:
//
//      None
//
// Return Value:
//
//      UINT    -   The current reference count on the document
//
// Function Calls:
//      Function                    Location
//
//      OutputDebugString           Windows API
//      CSimpleApp::AddRef          APP.CPP
//
// Comments:
//
//********************************************************************
STDMETHODIMP_(ULONG) CSimpleDoc::AddRef()
{
        OutputDebugString("In CSimpleDoc::AddRefrn");
        return SafeAddRef();
}
//**********************************************************************
//
// CSimpleDoc::Release
//
// Purpose:
//
//      Decrements the document reference count
//
// Parameters:
//
//      None
//
// Return Value:
//
//      UINT    -   The current reference count on the document
//
// Function Calls:
//      Function                    Location
//
//      OutputDebugString           Windows API
//
// Comments:
//
//********************************************************************
STDMETHODIMP_(ULONG) CSimpleDoc::Release()
{
        OutputDebugString("In CSimpleDoc::Releasern");
        return SafeRelease();
}
//**********************************************************************
//
// CSimpleDoc::InsertObject
//
// Purpose:
//
//      Inserts a new object to this document
//
// Parameters:
//
//      None
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      CSimpleSite::CSimpleSite    SITE.CPP
//      CSimpleSite::InitObject     SITE.CPP
//      memset                      C Runtime
//      OleUIInsertObject           OUTLUI function
//      CSimpleDoc::DisableInsertObject DOC.CPP
//
// Comments:
//
//      This implementation only allows one object to be inserted
//      into a document.  Once the object has been inserted, then
//      the Insert Object menu choice is greyed out, to prevent
//      the user from inserting another.
//
//********************************************************************
void CSimpleDoc::InsertObject()
{
        OLEUIINSERTOBJECT io;
        CStabilize stabilize(this);
        UINT iret;
        //@@WTK WIN32, UNICODE
        //char szFile[OLEUI_CCHPATHMAX];
        char szFile[OLEUI_CCHPATHMAX];
        m_lpSite = CSimpleSite::Create(this);
        // clear the structure
        _fmemset(&io, 0, sizeof(OLEUIINSERTOBJECT));
        // fill the structure
        io.cbStruct = sizeof(OLEUIINSERTOBJECT);
        io.dwFlags = IOF_SELECTCREATENEW |
                                        IOF_DISABLELINK | IOF_DISABLEDISPLAYASICON |
                                        IOF_CREATENEWOBJECT | IOF_CREATEFILEOBJECT;
        io.hWndOwner = m_hDocWnd;
        io.lpszCaption = "Insert Object";
        io.iid = IID_IOleObject;
        io.oleRender = OLERENDER_DRAW;
        io.lpIOleClientSite = &m_lpSite->m_OleClientSite;
        io.lpIStorage = m_lpSite->m_lpObjStorage;
        io.ppvObj = (LPVOID FAR *)&m_lpSite->m_lpOleObject;
        io.lpszFile = szFile;
        io.cchFile = sizeof(szFile) / sizeof *szFile;
        _fmemset(szFile, 0, sizeof(szFile));
        // call OUTLUI to do all the hard work
        iret = OleUIInsertObject(&io);
        if (iret == OLEUI_OK)
                {
                m_lpSite->InitObject((BOOL)(io.dwFlags & IOF_SELECTCREATENEW));
                // disable Insert Object menu item
                DisableInsertObject();
                }
        else
                {
                m_lpSite->Release();
                m_lpSite = NULL;
                m_lpStorage->Revert();
                }
}
//**********************************************************************
//
// CSimpleDoc::lResizeDoc
//
// Purpose:
//
//      Resizes the document
//
// Parameters:
//
//      LPRECT lpRect   -   The size of the client are of the "frame"
//                          Window.
//
// Return Value:
//
//      NULL
//
// Function Calls:
//      Function                                Location
//
//      MoveWindow                              Windows API
//
// Comments:
//
//********************************************************************
long CSimpleDoc::lResizeDoc(LPRECT lpRect)
{
        MoveWindow(
                        m_hDocWnd,
                        lpRect->left, lpRect->top,
                        lpRect->right, lpRect->bottom, TRUE);
        return NULL;
}
//**********************************************************************
//
// CSimpleDoc::lAddVerbs
//
// Purpose:
//
//      Adds the objects verbs to the edit menu.
//
// Parameters:
//
//      None
//
// Return Value:
//
//      NULL
//
// Function Calls:
//      Function                    Location
//
//      GetMenuItemCount            Windows API
//      OleUIAddVerbMenu            OUTLUI function
//
// Comments:
//
//********************************************************************
long CSimpleDoc::lAddVerbs(void)
{
        CStabilize stabilize(this);
        // m_fModifiedMenu is TRUE if the menu has already been modified
        // once.  Since we only support one obect every time the application
        // is run, then once the menu is modified, it doesn't have
        // to be done again.
        if (m_lpSite && !m_fModifiedMenu)
                {
                int nCount = GetMenuItemCount(m_lpApp->m_hEditMenu);
                OleUIAddVerbMenu ( m_lpSite->m_lpOleObject,
                                                   NULL,
                                                   m_lpApp->m_hEditMenu,
                                                   nCount + 1,
                                                   IDM_VERB0,
                                                   0,           // no maximum verb IDM enforced
                                                   FALSE,
                                                   1,
                                                   &m_lpApp->m_hCascadeMenu);
                m_fModifiedMenu = TRUE;
                }
        return (NULL);
}
//**********************************************************************
//
// CSimpleDoc::PaintDoc
//
// Purpose:
//
//      Paints the Document
//
// Parameters:
//
//      HDC hDC -   hDC of the document Window
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      CSimpleSite::PaintObj       SITE.CPP
//
// Comments:
//
//********************************************************************
void CSimpleDoc::PaintDoc (HDC hDC)
{
        CStabilize stabilize(this);
        // if we supported multiple objects, then we would enumerate
        // the objects and call paint on each of them from here.
        if (m_lpSite)
                m_lpSite->PaintObj(hDC);
}
//**********************************************************************
//
// CSimpleDoc::DisableInsertObject
//
// Purpose:
//
//      Disable the ability to insert a new object in this document.
//
// Parameters:
//
//      None
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      RevokeDragDrop              OLE API
//      EnableMenuItem              Windows API
//
// Comments:
//
//      This implementation only allows one object to be inserted
//      into a document.  Once the object has been inserted, then
//      the Insert Object menu choice is greyed out, to prevent
//      the user from inserting another. Also we revoke ourself as
//      a potential drop target.
//
//********************************************************************
void CSimpleDoc::DisableInsertObject(void)
{
        // Disable InsertObject menu choice
        EnableMenuItem( m_lpApp->m_hEditMenu, 1, MF_BYPOSITION | MF_DISABLED | MF_GRAYED);
        // Enable Copy menu choice
        EnableMenuItem( m_lpApp->m_hEditMenu, 0, MF_BYPOSITION | MF_ENABLED);
        // We no longer accept dropping of objects
        if (m_fRegDragDrop) {
                RevokeDragDrop(m_hDocWnd);
                m_fRegDragDrop = FALSE;
        }
}
//**********************************************************************
//
// CSimpleDoc::CopyObjectToClip
//
// Purpose:
//
//      Copy the embedded OLE object to the clipboard
//
// Parameters:
//
//      None
//
// Return Value:
//
//      None
//
// Function Calls:
//      Function                    Location
//
//      CDataXferObj::Create        DXFEROBJ.CPP
//      CDataXferObj::QueryInterface DXFEROBJ.CPP
//      OleSetClipboard             OLE API
//
// Comments:
//
//      This implementation only allows one object to be inserted
//      into a document.  Once the object has been inserted, then
//      the Copy menu choice is enabled.
//
//********************************************************************
void CSimpleDoc::CopyObjectToClip(void)
{
        LPDATAOBJECT lpDataObj;
        // Create a data transfer object by cloning the existing OLE object
        CDataXferObj FAR* pDataXferObj = CDataXferObj::Create(m_lpSite,NULL);
        if (! pDataXferObj) {
                MessageBox(NULL,"Out-of-memory","SimpDnD",MB_SYSTEMMODAL|MB_ICONHAND);
                return;
        }
        // initially obj is created with 0 refcnt. this QI will make it go to 1.
        pDataXferObj->QueryInterface(IID_IDataObject, (LPVOID FAR*)&lpDataObj);
        // put out data transfer object on the clipboard. this API will AddRef.
        OleSetClipboard(lpDataObj);
        // Give ownership of data transfer object to clipboard
        pDataXferObj->Release();
}

						