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windows-nt/Source/XPSP1/NT/com/winole/samples/clidemo/clidemo.c

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2020-09-26 03:20:57 -05:00
/*
* clidemo.c - OLE client application sample code
*
* Created by Microsoft Corporation.
* (c) Copyright Microsoft Corp. 1990 - 1992 All Rights Reserved
*
*/
/***************************************************************************
* IMPORTANT - README:
* OLE client applications are windows programs which use the OLE client
* APIs. Therefore it is imperative that you understand how these APIs
* operate. Most importantly it is essential that you keep in mind which
* procedure calls result in asynchronous states: a state where the operation
* is not truely complete after a return from the call.
*
* Many functions produce asynchronous states, for example, OleActivate,
* OleClose, OleCopyFromLink, OleCreate ... Reference your SDK manual for
* a complete list.
*
* So whenever you call any of these library functions keep in mind that
* the operation is not necessarily complete once a return is made.
* These operations require communications with a server application. With
* OLE the inter-application communication is done through DDE. In order
* for a DDE conversation to complete several DDE messages need to be
* sent and recieved by both the server and client OLE DLLs. So, the
* asynchronous operations will not complete until the client application
* enters a message dipatch loop. Therefore, it is necessary to enter
* a dispatch loop and wait for completion. It is not necessary to block
* all other operation; however, it is very important to coordinate the
* user activity to prevent disastrous re-entry cases.
*
* In this application I have written a macro to prevent re-entry
* problems. Namely: ANY_OBJECT_BUSY which prevents a user from initiating
* an action which will result in an asynchronous call if there is an object
* already in an asynchronous state.
*
* The following is brief summary of the three macros:
*
* ANY_OBJECT_BUSY: checks to see if any object in the document is busy.
* This prevents a new document from being saved to file if there are
* objects in asynchronous states.
*
* So, the problem is that we have to enter a message dispatch loop in order
* to let DDE messages get through so that asynchronous operations can finish.
* And while we are in the message dispatch loops (WaitForObject or WaitForAllObjects)
* we have to prevent the user from doing things that can't be done when an
* object(s) is busy. Yes, it is confusing , but, the end result is a super
* cool application that can have linked and embbeded objects!
***************************************************************************/
//*** INCLUDES ***
#include <windows.h> //* WINDOWS
#include <ole.h> //* OLE structs and defines
#include <shellapi.h> //* Shell, drag and drop headers
#include "demorc.h" //* header for resource file
#include "global.h" //* global app variables
#include "clidemo.h" //* app includes:
#include "register.h"
#include "stream.h"
#include "object.h"
#include "dialog.h"
#include "utility.h"
//*** VARIABLES ***
//** Global
HANDLE hInst;
BOOL fRetry = FALSE;
HWND hwndFrame; //* main window
HANDLE hAccTable; //* accelerator table
CHAR szFrameClass[] = "CliDemo";//* main window class name
CHAR szItemClass[] = "ItemClass";//* item window class name
CHAR szAppName[CBMESSAGEMAX];//* Application name
INT iObjects = 0; //* object count
INT iObjectNumber = 0; //* object number for object name
CHAR szFileName[CBPATHMAX];
extern INT giXppli ;
extern INT giYppli ;
//* ClipBoard formats:
OLECLIPFORMAT vcfLink; //* "ObjectLink"
OLECLIPFORMAT vcfNative; //* "Native"
OLECLIPFORMAT vcfOwnerLink; //* "OwnerLink"
/***************************************************************************
* WinMain() - Main Windows routine
***************************************************************************/
int APIENTRY WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInst,
LPSTR lpCmdLine,
INT nCmdLine
){
hInst = hInstance;
if (!InitApplication(hInst)) //* register window classes
return FALSE;
if (!InitInstance(hInst)) //* create window instance
return FALSE;
OfnInit(hInst); //* setup to use <commdlg.dll>
//* register clipboard formats
//* used for OLE
vcfLink = (OLECLIPFORMAT)RegisterClipboardFormat("ObjectLink");
vcfNative = (OLECLIPFORMAT)RegisterClipboardFormat("Native");
vcfOwnerLink = (OLECLIPFORMAT)RegisterClipboardFormat("OwnerLink");
ShowWindow(hwndFrame, SW_SHOWNORMAL);
UpdateWindow(hwndFrame);
ProcessCmdLine(lpCmdLine);
while (ProcessMessage(hwndFrame, hAccTable)) ;
return FALSE;
}
/***************************************************************************
* InitApplication()
*
* registers the window classes used by the application.
*
* Returns BOOL: - TRUE if successful.
***************************************************************************/
static BOOL InitApplication( //* ENTRY:
HANDLE hInst //* instance handle
){ //* LOCAL:
WNDCLASS wc; //* temp wind-class structure
wc.style = 0;
wc.lpfnWndProc = (WNDPROC)FrameWndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInst;
wc.hIcon = LoadIcon(hInst, MAKEINTRESOURCE(ID_APPLICATION));
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_APPWORKSPACE + 1);
wc.lpszMenuName = MAKEINTRESOURCE(ID_APPLICATION);
wc.lpszClassName = szFrameClass;
if (!RegisterClass(&wc))
return FALSE;
//* application item class
wc.style = CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW;
wc.lpfnWndProc = (WNDPROC)ItemWndProc;
wc.hIcon = NULL;
wc.cbWndExtra = sizeof(APPITEMPTR);
wc.lpszMenuName = NULL;
wc.lpszClassName = szItemClass;
if (!RegisterClass(&wc))
return FALSE;
return TRUE;
}
/***************************************************************************
* InitInstance()
*
* create the main application window.
*
* Returns BOOL: - TRUE if successful else FALSE.
***************************************************************************/
static BOOL InitInstance( //* ENTRY:
HANDLE hInst //* instance handel
){
HDC hDC ;
hAccTable = LoadAccelerators(hInst, MAKEINTRESOURCE(ID_APPLICATION));
if (!(hwndFrame =
CreateWindow(
szFrameClass, "",
WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL,
NULL,
hInst,
NULL
)))
return FALSE; //* ERROR return
LoadString(hInst, IDS_APPNAME, szAppName, CBMESSAGEMAX);
DragAcceptFiles(hwndFrame, TRUE); //* allow dragged and dropped files
hDC = GetDC (NULL); // Get the hDC of the desktop window
giXppli = GetDeviceCaps (hDC, LOGPIXELSX);
giYppli = GetDeviceCaps (hDC, LOGPIXELSY);
ReleaseDC (NULL, hDC);
return TRUE; //* SUCCESS return
}
/***************************************************************************
* ProcessCmdLine()
*
* process command line getting any command arguments.
***************************************************************************/
VOID ProcessCmdLine(LPSTR lpCmdLine)
{ //* LOCAL:
OFSTRUCT ofs;
if (*lpCmdLine)
{ //* look for file extension
LPSTR lpstrExt = lpCmdLine; //* pointer to file extension
while (*lpstrExt && *lpstrExt != '.')
lpstrExt = AnsiNext(lpstrExt);
lstrcpy(szFileName, lpCmdLine);
if (!(*lpstrExt)) //* append default extension
{
lstrcat(szFileName,".");
lstrcat(szFileName,szDefExtension);
}
//* get the files fully
OpenFile(szFileName, &ofs, OF_PARSE);//* qualified name
lstrcpy(szFileName, ofs.szPathName);
}
else
*szFileName = 0;
//* pass filename to main winproc
SendMessage(hwndFrame,WM_INIT,(WPARAM)0,(LPARAM)0);
}
/***************************************************************************
* FrameWndProc()
*
* Message handler for the application frame window.
*
* Returns long - Variable, depends on message.
***************************************************************************/
LONG APIENTRY FrameWndProc( //* ENTRY:
HWND hwnd, //* standard wind-proc parameters
UINT msg,
DWORD wParam,
LONG lParam
){ //* LOCAL:
//* ^ Document file name
static LHCLIENTDOC lhcDoc; //* Document Handle
static LPOLECLIENT lpClient; //* pointer to client
static LPAPPSTREAM lpStream; //* pointer to stream vtbl
APPITEMPTR pItem; //* application item pointer
switch (msg)
{
case WM_INIT: //* user defined message
if (!InitAsOleClient(hInst, hwnd, szFileName, &lhcDoc, &lpClient, &lpStream))
DestroyWindow(hwnd);
break;
//* the following three messages are
//* used to avoid problems with OLE
//* see the comment in object.h
case WM_DELETE: //* user defined message
pItem = (APPITEMPTR) lParam; //* delete object
WaitForObject(pItem);
ObjDelete(pItem,OLE_OBJ_DELETE);
if (wParam)
cOleWait--;
break;
case WM_ERROR: //* user defined message
ErrorMessage(wParam); //* display error message
break;
case WM_RETRY: //* user defined message
RetryMessage((APPITEMPTR)lParam, RD_RETRY | RD_CANCEL);
break;
case WM_INITMENU:
UpdateMenu((HMENU)wParam);
break;
case WM_COMMAND:
{
WORD wID = LOWORD(wParam);
pItem = GetTopItem();
switch (wID)
{
case IDM_NEW:
ANY_OBJECT_BUSY;
NewFile(szFileName,&lhcDoc,lpStream);
break;
case IDM_OPEN:
ANY_OBJECT_BUSY;
MyOpenFile(szFileName,&lhcDoc,lpClient,lpStream);
break;
case IDM_SAVE:
ANY_OBJECT_BUSY;
SaveFile(szFileName,lhcDoc,lpStream);
break;
case IDM_SAVEAS:
ANY_OBJECT_BUSY;
SaveasFile(szFileName,lhcDoc,lpStream);
break;
case IDM_ABOUT:
AboutBox();
break;
case IDM_INSERT:
ANY_OBJECT_BUSY;
ObjInsert(lhcDoc, lpClient);
break;
case IDM_INSERTFILE:
ANY_OBJECT_BUSY;
ObjCreateFromTemplate(lhcDoc,lpClient);
break;
case IDM_PASTE:
case IDM_PASTELINK:
ANY_OBJECT_BUSY;
ObjPaste(wID == IDM_PASTE,lhcDoc,lpClient);
break;
case IDM_LINKS:
ANY_OBJECT_BUSY;
pItem = GetTopItem();
LinkProperties();
break;
case IDM_EXIT:
ANY_OBJECT_BUSY;
SendMessage(hwnd, WM_SYSCOMMAND, SC_CLOSE, 0L);
break;
case IDM_COPY:
case IDM_CUT:
ANY_OBJECT_BUSY;
if (!ObjCopy(pItem))
{
ErrorMessage((wParam == IDM_CUT) ?
E_CLIPBOARD_CUT_FAILED : E_CLIPBOARD_COPY_FAILED);
break;
}
if (wParam == IDM_COPY)
break;
case IDM_CLEAR: //* CUT falls through to clear
ANY_OBJECT_BUSY;
ClearItem(pItem);
break;
case IDM_CLEARALL:
ANY_OBJECT_BUSY;
ClearAll(lhcDoc,OLE_OBJ_DELETE);
Dirty(DOC_DIRTY);
break;
default:
if( (wParam >= IDM_VERBMIN) && (wParam <= IDM_VERBMAX) )
{
ANY_OBJECT_BUSY;
ExecuteVerb(wParam - IDM_VERBMIN,pItem);
break;
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}
break;
}
case WM_DROPFILES:
ANY_OBJECT_BUSY;
ObjCreateWrap((HANDLE)wParam, lhcDoc, lpClient);
break;
case WM_CLOSE:
ANY_OBJECT_BUSY;
if (!SaveAsNeeded(szFileName, lhcDoc, lpStream))
break;
DeregDoc(lhcDoc);
DestroyWindow(hwnd);
break;
case WM_DESTROY:
EndStream(lpStream);
EndClient(lpClient);
PostQuitMessage(0);
break;
case WM_QUERYENDSESSION: //* don't let windows terminate
return (QueryEndSession(szFileName,lhcDoc, lpStream));
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0L;
}
/***************************************************************************
* InitAsOleClient()
*
* Initiates the creation of stream and client vtbls. These vtbls are very
* important for the proper operation of this application. The stream vtbl
* lets the OLE librarys know where the location of the stream I/O routines
* reside. The stream routines are used by OleLoadFromStream and the like.
* The client vtbl is used to hold the pointer to the CallBack function.
* IMPORTANT: both the client and the stream structures have pointers to
* vtbls which have the pointers to the functions. Therefore, it is
* necessary to allocate space for the vtbl and the client structure
* which has the pointer to the vtbl.
**************************************************************************/
static BOOL InitAsOleClient( //* ENTRY:
HANDLE hInstance, //* applicaion instance handle
HWND hwnd, //* main window handle
PSTR pFileName, //* document file name
LHCLIENTDOC *lhcDoc, //* pointer to document Handle
LPOLECLIENT *lpClient, //* pointer to client pointer
LPAPPSTREAM *lpStream //* pointer to APPSTREAM pointer
){
//* initiate client vtbl creation
if (!(*lpClient = InitClient(hInstance)))
{
SendMessage(hwnd, WM_SYSCOMMAND, SC_CLOSE, 0L);
return FALSE; //* ERROR return
}
//* initiate stream vtbl creation
if (!(*lpStream = InitStream(hInstance)))
{
SendMessage(hwnd, WM_SYSCOMMAND, SC_CLOSE, 0L);
return FALSE; //* ERROR return
}
if (*pFileName && RegDoc(pFileName,lhcDoc)
&& LoadFile(pFileName,*lhcDoc,*lpClient,*lpStream))
{
SetTitle(pFileName);
return TRUE; //* SUCCESS return
}
NewFile(pFileName, lhcDoc, *lpStream);
return TRUE; //* SUCCESS return
} //* SUCCESS return
/****************************************************************************
* InitClient()
*
* Initialize the OLE client structure, create and fill the OLECLIENTVTBL
* structure.
*
* Returns LPOLECLIENT - if successful a pointer to a client structure
* , otherwise NULL.
***************************************************************************/
static LPOLECLIENT InitClient( //* ENTRY:
HANDLE hInstance //* application instance handle
){ //* LOCAL:
LPOLECLIENT lpClient=NULL; //* pointer to client struct
//* Allocate vtbls
if (!(lpClient = (LPOLECLIENT)GlobalLock(
GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizeof(OLECLIENT))
)))
goto Error; //* ERROR jump
if (!(lpClient->lpvtbl = (LPOLECLIENTVTBL)GlobalLock(
GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizeof(OLECLIENTVTBL))
)))
goto Error; //* ERROR jump
//* set the CALLBACK function
//* pointer
lpClient->lpvtbl->CallBack = CallBack;
return lpClient; //* SUCCESS return
Error: //* ERROR Tag
ErrorMessage(E_FAILED_TO_ALLOC);
EndClient(lpClient); //* free any allocated space
return NULL; //* ERROR return
}
/****************************************************************************
* InitStream()
*
* Create and fill the STREAMVTBL. Create a stream structure and initialize
* pointer to stream vtbl.
*
* Returns LPAPPSTREAM - if successful a pointer to a stream structure
* , otherwise NULL .
***************************************************************************/
static LPAPPSTREAM InitStream( //* ENTRY:
HANDLE hInstance //* handle to application instance
){ //* LOCAL:
LPAPPSTREAM lpStream = NULL; //* pointer to stream structure
if (!(lpStream = (LPAPPSTREAM)GlobalLock(
GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizeof(APPSTREAM))
)))
goto Error; //* ERROR jump
if (!(lpStream->olestream.lpstbl = (LPOLESTREAMVTBL)GlobalLock(
GlobalAlloc(GMEM_FIXED | GMEM_ZEROINIT, sizeof(OLESTREAMVTBL))
)))
goto Error; //* ERROR jump
//* set stream func. pointers
lpStream->olestream.lpstbl->Get = (DWORD ( CALLBACK *)(LPOLESTREAM, VOID FAR *, DWORD)) ReadStream;
lpStream->olestream.lpstbl->Put = (DWORD ( CALLBACK *)(LPOLESTREAM, OLE_CONST VOID FAR *, DWORD)) WriteStream;
return lpStream; //* SUCCESS return
Error: //* ERROR Tag
ErrorMessage(E_FAILED_TO_ALLOC);
EndStream(lpStream);
return NULL; //* ERROR return
}
/***************************************************************************
* UpdateMenu()
*
* Enabling or disable menuitems based upon program state.
***************************************************************************/
static VOID UpdateMenu( //* ENTRY:
HMENU hMenu //* menu handle to updated
){ //* LOCAL:
INT mf; //* generic menu flag
APPITEMPTR paItem; //* app item pointer
HMENU hSub;
//* there must be at least on object
//* for the following to be enabled
paItem = GetTopItem() ;
mf = (paItem ? MF_ENABLED : MF_GRAYED);
EnableMenuItem(hMenu, IDM_CUT, mf); //* i.e. Cut,Copy,Clear,Clearall...
EnableMenuItem(hMenu, IDM_COPY, mf);
EnableMenuItem(hMenu, IDM_CLEAR, mf);
EnableMenuItem(hMenu, IDM_CLEARALL, mf);
//* enable links option only if there
//* is at least one linked object
EnableMenuItem(hMenu, IDM_LINKS, MF_GRAYED);
for (; paItem; paItem = GetNextItem(paItem))
{
if (paItem->otObject == OT_LINK)
{
EnableMenuItem(hMenu, IDM_LINKS, MF_ENABLED);
break;
}
}
if (hSub = GetSubMenu(hMenu,POS_EDITMENU))
UpdateObjectMenuItem(hSub);
if (OleQueryCreateFromClip(STDFILEEDITING, olerender_draw, 0) == OLE_OK)
EnableMenuItem(hMenu, IDM_PASTE, MF_ENABLED);
else if (OleQueryCreateFromClip(STATICP, olerender_draw, 0) == OLE_OK)
EnableMenuItem(hMenu, IDM_PASTE, MF_ENABLED);
else
EnableMenuItem(hMenu, IDM_PASTE, MF_GRAYED);
if (OleQueryLinkFromClip(STDFILEEDITING, olerender_draw, 0) == OLE_OK)
EnableMenuItem(hMenu, IDM_PASTELINK, MF_ENABLED);
else
EnableMenuItem(hMenu, IDM_PASTELINK, MF_GRAYED);
}
/***************************************************************************
* NewFile()
*
* Save the present document and open a new blank one.
***************************************************************************/
static VOID NewFile( //* ENTRY:
PSTR pFileName, //* open file name
LHCLIENTDOC *lhcptrDoc, //* pointer to client doc. handle
LPAPPSTREAM lpStream //* pointer to stream structure
){ //* LOCAL:
static CHAR szUntitled[CBMESSAGEMAX] = "";//* "(Untitled)" string
LHCLIENTDOC lhcDocNew; //* handle for new doc.
if (!(*szUntitled))
LoadString(hInst, IDS_UNTITLED, (LPSTR)szUntitled, CBMESSAGEMAX);
if (SaveAsNeeded(pFileName, *lhcptrDoc, lpStream))
{ //* try to register new document
if (!RegDoc(szUntitled, &lhcDocNew))
return; //* before deregistring the old one
DeregDoc(*lhcptrDoc);
*lhcptrDoc = lhcDocNew;
Dirty(DOC_CLEAN); //* new document is clean
lstrcpy(pFileName,szUntitled);
SetTitle(pFileName);
iObjectNumber = 0;
}
}
/***************************************************************************
* MyOpenFile()
*
* Open a file and load it. Notice that the new file is loaded before
* the old is removed. This is done to assure a succesful file load
* before removing an existing document.
***************************************************************************/
static VOID MyOpenFile( //* ENTRY:
PSTR pFileName, //* open file name
LHCLIENTDOC *lhcptrDoc, //* pointer to document handle
LPOLECLIENT lpClient, //* pointer to client structure
LPAPPSTREAM lpStream //* pointer to stream structure
){ //* LOCAL:
CHAR szNewFile[CBPATHMAX];//* new file name buffer
LHCLIENTDOC lhcDocNew; //* handle of new document
APPITEMPTR pItem; //* hold top item
if (SaveAsNeeded(pFileName, *lhcptrDoc, lpStream))
{
*szNewFile = 0;
if (!OfnGetName(hwndFrame, szNewFile, IDM_OPEN))
return; //* ERROR return
if (!RegDoc(szNewFile,&lhcDocNew))
return; //* ERROR return
pItem = GetTopItem();
ShowDoc(*lhcptrDoc,0); //* make old doc objects hidden.
//* try to load the new file before
if (!LoadFile(szNewFile, lhcDocNew, lpClient, lpStream))
{ //* before removing the old.
DeregDoc(lhcDocNew); //* restore old document if new
SetTopItem(pItem); //* file did not load
ShowDoc(*lhcptrDoc,1);
return; //* ERROR return
}
DeregDoc(*lhcptrDoc); //* deregister old document
*lhcptrDoc = lhcDocNew;
lstrcpy(pFileName,szNewFile);
SetTitle(pFileName); //* set new title
Dirty(DOC_CLEAN);
}
} //* SUCCESS return
/***************************************************************************
* SaveasFile()
*
* Prompt the user for a new file name. Write the document to the new
* filename.
***************************************************************************/
static VOID SaveasFile( //* ENTRY:
PSTR pFileName, //* old filename
LHCLIENTDOC lhcDoc, //* document handle
LPAPPSTREAM lpStream //* pointer to stream structure
){
CHAR szNewFile[CBPATHMAX];//* new file name
*szNewFile = 0; //* prompt user for new file name
if (!OfnGetName(hwndFrame, szNewFile, IDM_SAVEAS))
return; //* ERROR return
//* rename document
if (!SaveFile(szNewFile, lhcDoc, lpStream))
return;
if (Error(OleRenameClientDoc(lhcDoc, szNewFile)))
{
ErrorMessage(W_FAILED_TO_NOTIFY);
return; //* ERROR return
}
lstrcpy(pFileName,szNewFile);
SetTitle(pFileName);
} //* SUCCESS return
/***************************************************************************
* SaveFile()
*
* Save a compound document file. If the file is untitled, ask the user
* for a name and save the document to that file.
***************************************************************************/
static BOOL SaveFile( //* ENTRY:
PSTR pFileName, //* file to save document to
LHCLIENTDOC lhcDoc, //* OLE document handle
LPAPPSTREAM lpStream //* pointer to app. stream struct
){ //* LOCAL:
CHAR szNewFile[CBPATHMAX];//* New file name strings
CHAR szOemFileName[2*CBPATHMAX];
static CHAR szUntitled[CBMESSAGEMAX] = "";
int fh; //* file handle
*szNewFile = 0;
if (!(*szUntitled))
LoadString(hInst, IDS_UNTITLED, (LPSTR)szUntitled, CBMESSAGEMAX);
if (!lstrcmp(szUntitled, pFileName))//* get filename for the untitled case
{
if (!OfnGetName(hwndFrame, szNewFile, IDM_SAVEAS))
return FALSE; //* CANCEL return
lstrcpy(pFileName,szNewFile);
SetTitle(pFileName);
}
AnsiToOem(pFileName, szOemFileName);
if ((fh = _lcreat((LPSTR)szOemFileName, 0)) <= 0)
{
ErrorMessage(E_INVALID_FILENAME);
return FALSE; //* ERROR return
}
lpStream->fh = fh;
//* save file on disk
if (!WriteToFile(lpStream))
{
_lclose(fh);
ErrorMessage(E_FAILED_TO_SAVE_FILE);
return FALSE; //* ERROR return
}
_lclose(fh);
if (Error(OleSavedClientDoc(lhcDoc)))
{
ErrorMessage(W_FAILED_TO_NOTIFY);
return FALSE; //* ERROR return
}
Dirty(DOC_CLEAN);
return TRUE; //* SUCCESS return
}
/***************************************************************************
* LoadFile()
*
* Load a document file from disk.
***************************************************************************/
static BOOL LoadFile( //* ENTRY:
PSTR pFileName, //* file name
LHCLIENTDOC lhcDoc, //* document handle
LPOLECLIENT lpClient, //* pointer to client structure
LPAPPSTREAM lpStream //* pointer to stream structure
){ //* LOCAL:
//* OEM file name
CHAR szOemFileName[2*CBPATHMAX];
int fh; //* file handle
INT iObjectNumberHold; //* hold object number
AnsiToOem(pFileName, szOemFileName);
if ((fh = _lopen(szOemFileName, OF_READ | OF_SHARE_DENY_WRITE)) == -1)
{
ErrorMessage(E_FAILED_TO_READ_FILE);
return FALSE; //* ERROR return
}
lpStream->fh = fh;
iObjectNumberHold = iObjectNumber; //* save object number so it can
iObjectNumber = 0; //* be restored if read from file
//* fails
if (!ReadFromFile(lpStream, lhcDoc, lpClient))
{
_lclose(fh);
ErrorMessage(E_FAILED_TO_READ_FILE);
iObjectNumber = iObjectNumberHold;
return FALSE; //* ERROR return
}
_lclose(fh);
return TRUE; //* SUCCESS return
}
/***************************************************************************
* RegDoc()
*
* Register the client document with the OLE library.
**************************************************************************/
static BOOL RegDoc( //* ENTRY:
PSTR pFileName, //* file name
LHCLIENTDOC *lhcptrDoc //* pointer to client document handle
){
if (Error(OleRegisterClientDoc(szAppName, (LPSTR)pFileName, 0L, lhcptrDoc)))
{
ErrorMessage(W_FAILED_TO_NOTIFY);
return FALSE; //* ERROR return
}
return TRUE; //* SUCCESS return
}
/****************************************************************************
* DeregDoc()
*
* This function initiates the removal of all OLE objects from the
* current document and deregisters the document with the OLE library.
***************************************************************************/
static VOID DeregDoc( //* ENTRY:
LHCLIENTDOC lhcDoc //* client document handle
){
if (lhcDoc)
{ //* release all OLE objects
ClearAll(lhcDoc,OLE_OBJ_RELEASE); //* and remove them from the screen
WaitForAllObjects();
if (Error(OleRevokeClientDoc(lhcDoc)))
ErrorMessage(W_FAILED_TO_NOTIFY);
}
} //* SUCCESS return
/***************************************************************************
* ClearAll()
*
* This function will destroy all of the item windows in the current
* document and delete all OLE objects. The loop is basically an enum
* of all child windows.
**************************************************************************/
static VOID ClearAll( //* ENTRY:
LHCLIENTDOC lhcDoc, //* application document handle
BOOL fDelete //* Delete / Release
){ //* LOCAL:
APPITEMPTR pItemNext; //* working handles
APPITEMPTR pItem; //* pointer to application item
pItem = GetTopItem();
while (pItem)
{
pItemNext = GetNextItem(pItem);
if (pItem->lhcDoc == lhcDoc)
ObjDelete(pItem, fDelete);
pItem = pItemNext;
}
}
//* SUCCESS return
/***************************************************************************
* ClearItem()
*
* This function will destroy an item window, and make the
* next window active.
**************************************************************************/
VOID FAR ClearItem( //* ENTRY:
APPITEMPTR pItem //* application item pointer
){
pItem->fVisible = FALSE;
SetTopItem(GetNextActiveItem());
ObjDelete(pItem, OLE_OBJ_DELETE);
Dirty(DOC_DIRTY);
}
/****************************************************************************
* SaveAsNeeded()
*
* This function will have the file saved if and only
* if the document has been modified. If the fDirty flag has
* been set to TRUE, then the document needs to be saved.
*
* Returns: BOOL - TRUE if document doesn't need saving or if the
* document has been saved successfully.
***************************************************************************/
static BOOL SaveAsNeeded( //* ENTRY:
PSTR pFileName, //* file to save
LHCLIENTDOC lhcDoc, //* OLE doc handle
LPAPPSTREAM lpStream //* pointer to OLE stream vtbl ...
){ //* LOCAL:
CHAR sz[CBMESSAGEMAX]; //* work strings
CHAR sz2[CBMESSAGEMAX + CBPATHMAX];
if (Dirty(DOC_QUERY)) //* if doc is clean don't bother
{
LoadString(hInst, IDS_MAYBESAVE, sz, CBMESSAGEMAX);
wsprintf(sz2, sz, (LPSTR)pFileName );
switch (MessageBox(hwndFrame, sz2, szAppName, MB_YESNOCANCEL | MB_ICONQUESTION))
{
case IDCANCEL:
return FALSE; //* CANCEL return
case IDYES:
return (SaveFile(pFileName,lhcDoc,lpStream));
default:
break;
}
}
return TRUE; //* SUCCESS return
}
/****************************************************************************
* SetTitle()
*
* Set the window caption to the current file name. If szFileName is
* NULL, the caption will be set to "(Untitled)".
***************************************************************************/
static VOID SetTitle( //* ENTRY:
PSTR pFileName //* file name
){ //* LOCAL
//* window title string
CHAR szTitle[CBMESSAGEMAX + CBPATHMAX];
wsprintf(szTitle, "%s - %s", (LPSTR)szAppName, (LPSTR)pFileName);
SetWindowText(hwndFrame, szTitle);
}
/***************************************************************************
* EndClient()
*
* Perform cleanup prior to app termination. The OLECLIENT
* memory blocks and procedure instance thunks freed.
**************************************************************************/
static VOID EndStream( //* ENTRY:
LPAPPSTREAM lpStream //* pointer to stream structure
){ //* LOCAL:
HANDLE hGeneric; //* temp handle
if (lpStream) //* is there a STREAM struct?
{
if (lpStream->olestream.lpstbl)
{
FreeProcInstance((FARPROC)lpStream->olestream.lpstbl->Get);
FreeProcInstance((FARPROC)lpStream->olestream.lpstbl->Put);
hGeneric = GlobalHandle((LPSTR)lpStream->olestream.lpstbl);
GlobalUnlock(hGeneric);
GlobalFree(hGeneric);
}
hGeneric = GlobalHandle((LPSTR)lpStream);
GlobalUnlock(hGeneric);
GlobalFree(hGeneric);
}
} //* SUCCESS return
/***************************************************************************
* EndClient()
*
* Perform cleanup prior to app termination. The OLECLIENT
* memory blocks and procedure instance thunks are freed.
**************************************************************************/
static VOID EndClient( //* ENTRY:
LPOLECLIENT lpClient //* pointer to client structure
){ //* LOCAL:
HANDLE hGeneric; //* temp handle
if (lpClient) //* is there a client structure
{
if (lpClient->lpvtbl)
{
FreeProcInstance(lpClient->lpvtbl->CallBack);
hGeneric = GlobalHandle((LPSTR)lpClient->lpvtbl);
GlobalUnlock(hGeneric);
GlobalFree(hGeneric);
}
hGeneric = GlobalHandle((LPSTR)lpClient);
GlobalUnlock(hGeneric);
GlobalFree(hGeneric);
}
} //* SUCCESS return
/****************************************************************************
* QueryEndSession()
***************************************************************************/
static LONG QueryEndSession( //* ENTRY:
PSTR pFileName, //* document name
LHCLIENTDOC lhcDoc, //* client document handle
LPAPPSTREAM lpStream //* application stream pointer
){ //* LOCAL:
APPITEMPTR pItem; //* application item pointer
for (pItem = GetTopItem(); pItem; pItem = GetNextItem(pItem))
if (OleQueryOpen(pItem->lpObject) == OLE_OK)
{
MessageBox(hwndFrame,"Exit CliDemo before closing Windows",
szAppName, MB_OK | MB_ICONSTOP);
return 0L;
}
if (!SaveAsNeeded(pFileName, lhcDoc, lpStream))
return 0L;
DeregDoc(lhcDoc);
return 1L;
}
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