Liren Large Software Subsidy 7/07.iso/c/c082_144/6.ddi/CLIOLE.ZIP/CLIOLE.C

C/C++ Source or Header | 1992-06-10 | 13.2 KB | 552 lines

// Windows 3.1 Demo Program
// Copyright (c) 1992 by Borland International

// File CLIOLE.C
// An example of an Ole Client.  It demonstrates
// a simple use of Client Ole functions.

// Its main window allows the user to create a paint brush object, or
// copy an object in from the clipboard.  Note, you do need to have
// paint brush available on the system.  (It is a standard part of
// Windows 3.1).

#define STRICT

#include <windows.h>
#include <ole.h>
#include <commdlg.h>
#include <process.h>
#include <alloc.h>
#include <dir.h>
#include <dos.h>
#pragma hdrstop

#include "clioleer.h"
#include "cliole.h"
#include "cliolerc.h"

char szAppName[] = "ClientOleApp" ;

HINSTANCE hInst = 0;

void InitApplication(void)
{
    WNDCLASS wndclass;

    wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
    wndclass.lpfnWndProc   = (WNDPROC) WndProc ;
    wndclass.cbClsExtra    = 0 ;
    wndclass.cbWndExtra    = 0 ;
    wndclass.hInstance     = hInst ;
    wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
    wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
    wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wndclass.lpszMenuName  = "CLIOLEMENU" ;
    wndclass.lpszClassName = szAppName ;
    RegisterClass (&wndclass) ;
}

// These are clipboard formats that Ole
// applications use to determine the type of
// object on the clipboard.  This application does not
// make use of them.

OLECLIPFORMAT vcfLink, vcfNative, vcfOwnerLink;

void InitInstance(void)
{
    vcfLink = RegisterClipboardFormat( "ObjectLink" );
    vcfNative = RegisterClipboardFormat( "Native" );
    vcfOwnerLink = RegisterClipboardFormat( "OwnerLink" );
}

#pragma argsused
int PASCAL WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    LPSTR lpszCommandLine, int nCmdShow)
     {
     HWND        hwnd ;
     MSG         msg ;

     hInst = hInstance;
     if (!hPrevInstance)
     {
        InitApplication();
     }

     InitInstance();

     hwnd = CreateWindow (szAppName,
            "Client OLE Program",
                    WS_OVERLAPPEDWINDOW,
                    CW_USEDEFAULT,
                    CW_USEDEFAULT,
                    CW_USEDEFAULT,
                    CW_USEDEFAULT,
                    NULL,
                    NULL,
                    hInstance,
                    NULL) ;

     ShowWindow (hwnd, nCmdShow) ;
     UpdateWindow (hwnd) ;

     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}



int FAR PASCAL _export StdCallBack(LPOLECLIENT lpClient,
    OLE_NOTIFICATION notification,
    LPOLEOBJECT lpObject )
{
    static TOleNot OleNotStruct;
    OleNotStruct.lpClient = lpClient;
    OleNotStruct.not      = notification;
    OleNotStruct.lpObject = lpObject;

    return (
        (int)SendMessage( (( TOleClient * )lpClient)->hwnd,
            WM_U_CALLBACK, 0, (DWORD)&OleNotStruct )
            );
}

// It should be noted that since much of the data associated with the
// main window is stored globally, only one Windows class OleAppName
// is supported.  Extending the program to support several windows of this
// class would require that you store this data on a per window basis.
// A good technique would be to use a structure which contains all
// these data members, and to store a pointer to such a structure
// in the extra bytes of the windows.

    OLESTATUS ret;           //last OleStatus
    LHCLIENTDOC lhClientDoc;
    char lpszDocName[ MAXPATH ];
    BOOL bDefDocName;

    char lpszObjectName[ MAXPATH ];
    char lpszLastObjectName[ MAXPATH ];
    TOleClient *pOleClient;
    BOOL bObjectLoaded = FALSE;
    BOOL bUndoObjectLoaded = FALSE;
    LPOLEOBJECT lpObject = NULL;        // actual object we are housing
    LPOLEOBJECT lpUndoObject = NULL;    // last change made to object
    int nNextObjectNum = 0;


long FAR PASCAL _export WndProc (HWND hwnd, WORD message, WORD wParam, LONG lParam)
{

   HDC           hdc ;
    PAINTSTRUCT   ps ;
    RECT              rect ;
   TOleNot far * ons ;

    switch (message)
    {
        case WM_U_REDRAW:
            WMURedraw( hwnd );
            return 0;

        case WM_COMMAND:
            switch ( wParam )
            {
                case CM_PBRUSH:
                    CMPBrush();
                    break;

                case CM_UNDO:
                    CMUndo(hwnd);
                    break;

                case CM_ACTIVATE:
                    CMActivate( hwnd );
                    break;

                case CM_CLEAR:
                    CMClear( hwnd );
                    break;

                case CM_CUT:
                    CMCut(hwnd);
                    break;

                case CM_COPY:
                    CMCopy(hwnd);
                    break;

                case CM_PASTE:
                    CMPaste(hwnd);
                    break;

                case CM_ABOUT:
                    CMAbout( hwnd );
                    break;

                case CM_EXIT:
                    DestroyWindow( hwnd );
                    break;
            }
            return 0;

        case WM_CREATE:
            WMCreate( hwnd );
            return 0;

        case WM_INITMENU:
            WMInitMenu( hwnd , wParam );
            return 0;

        case WM_U_CALLBACK:
            (TOleNot far *)ons = (TOleNot far *)lParam;
            WMUCallBack( ons->lpClient, ons->not, ons->lpObject );
            return 0;

        case WM_PAINT:
             hdc = BeginPaint (hwnd, &ps) ;
             GetClientRect (hwnd, &rect) ;

             Paint( hwnd , hdc );

             EndPaint (hwnd, &ps) ;
             return 0 ;

        case WM_DESTROY:
            PostQuitMessage (0) ;
            return 0 ;
    }
    return DefWindowProc (hwnd, message, wParam, lParam) ;
}


// Comments on MakeTOleClient:
// If no vtbl has been constructed, make one.  Then initialize
// the vtbl member of the struct to point to it.
// To be more robust, one should always check that memory is allocated,
// and MakeProcInstance succeeds.

LPOLECLIENTVTBL lpClientVtbl = NULL;

void MakeTOleClient( TOleClient *OleClient, HWND owner , HINSTANCE hInst )
{
    OleClient->hwnd = owner;
    if ( !lpClientVtbl )
    {
        lpClientVtbl = (LPOLECLIENTVTBL) malloc( sizeof ( OLECLIENTVTBL ));
        lpClientVtbl->CallBack = (TCallBack)MakeProcInstance( (FARPROC)StdCallBack,
                    hInst );
    }
    OleClient->oleClient.lpvtbl = lpClientVtbl;
}

void WMURedraw(HWND hwnd )
{
    bObjectLoaded = TRUE;
    InvalidateRect( hwnd, NULL, TRUE );
    UpdateWindow( hwnd );
}

#pragma argsused
int WMUCallBack( LPOLECLIENT lpOleClient ,
                 OLE_NOTIFICATION oleNot,
                 LPOLEOBJECT lpOleObject )
{
    switch ( oleNot ) {
        case OLE_CHANGED:
        case OLE_SAVED:
            PostMessage( (( TOleClient *)lpOleClient)->hwnd ,
                WM_U_REDRAW, 0, 0L );
            break;

        case OLE_CLOSED:
            break;

        case OLE_QUERY_PAINT:
            break;

        case OLE_RELEASE:
            break;

        case OLE_RENAMED:
            break;

        default:
            break;
    }
    return TRUE;
}

// create a new paint brush
void CMPBrush(void)
{
    BackupObject();
    bObjectLoaded = FALSE;

    lstrcpy( lpszObjectName, GetNextObjectName() );

    ret = OleCreate( "StdFileEditing",
            (LPOLECLIENT)pOleClient,
            "PBRUSH",
            lhClientDoc,
            szAppName,
            &lpObject,
            olerender_draw,
            0 );

   // Creating an Ole Object is an asynchronous operation.  An
    // interesting experiment is to use TDW to step into
    // WaitOleNotBusy (which the following wait macro takes you
    // to) and look at the user screen between message
    // dispatching.  You should see pbrush gradually paint
    // itself as it processes the messages which which Ole
   // generates for it.  In general, if an Ole Server does not
    // behave properly when creating an object, a likely cause is a
    // problem with the message dispatch loop.

    wait( ret , lpObject );

    // OleSetHostNames sets the name in the server app.  If this
    // was not called, pbrush would display a string with a bunch
   // of % signs in it.

    ret = OleSetHostNames( lpObject, szAppName, lpszObjectName );
    wait( ret , lpObject );
}

void CMUndo( HWND hwnd )
{
    if ( lpUndoObject )        // we have a previous object
        if ( lpUndoObject != lpObject )    // it is different then the current one
        {
            LPOLEOBJECT lpObjectToDelete = lpObject;
            lpObject = lpUndoObject;
            ret = OleDelete( lpObjectToDelete );
            wait( ret , lpObjectToDelete );
            bObjectLoaded = bUndoObjectLoaded;

            InvalidateRect( hwnd, NULL, TRUE );
         UpdateWindow( hwnd );
        }
}

void CMCut(HWND hwnd )
{
    CMCopy(hwnd);
    CloseCurrentOle(hwnd);
}

void CMCopy( HWND hwnd )
{
    if ( OpenClipboard( hwnd ) && EmptyClipboard() )
    {
        ret = OleCopyToClipboard( lpObject );
        check( ret );
        CloseClipboard();
    }
}

void BackupObject(void)
{
    if ( lpObject )
   {
        ret = OleClone( lpObject, (LPOLECLIENT)pOleClient, lhClientDoc, szAppName, &lpUndoObject );
        wait( ret, lpObject );
        lstrcpy( lpszLastObjectName, lpszObjectName );
        lstrcpy( lpszObjectName , GetNextObjectName() );
        bUndoObjectLoaded = bObjectLoaded;
    }
}


void CMPaste( HWND hwnd )
{
    if ( OpenClipboard( hwnd ) )
    {
        BackupObject();

        ret = OleCreateFromClip( "StdFileEditing",
            (LPOLECLIENT)pOleClient,
            lhClientDoc,
            lpszObjectName,
            &lpObject,
            olerender_draw,
            0 );
        check( ret );

        bObjectLoaded = TRUE;

        CloseClipboard();
        PostMessage( hwnd , WM_U_REDRAW, 0, 0L );
    }
}

LPSTR GetNextObjectName(void)
{
    static char buffer[ MAXPATH ];
    wsprintf( buffer, "object #%03d", nNextObjectNum++ );
    return buffer;
}

void Paint( HWND hwnd, HDC hdc )
{
    LPOLEOBJECT lpObjectToDraw = NULL;

    if ( bObjectLoaded )
        lpObjectToDraw = lpObject;
    else if ( lpUndoObject )
        lpObjectToDraw = lpUndoObject;

    if ( lpObjectToDraw ) {
        RECT rect;
        GetClientRect( hwnd, &rect );

        // Tips for OleDraw:
        // OleDraw will return OLE_ERROR_OBJECT if the
      // object to be drawn is invalid.  A case such as this,
      // could happen if the Paint function does not get
        // informed about the object being deleted, or not having
        // yet been created.
        // You can also get OLE_ERROR_BLANK if you draw an object
        // which has not been stored.  A time when this could happen
      // is when trying use OleDraw on the object after using OleCreate
        // to make it, but not yet using the Servers update command
        // to save the object with Ole.
        ret = OleDraw( lpObjectToDraw , hdc, &rect , NULL, 0 );
        wait( ret, lpObjectToDraw );
    }
}

void WMCreate( HWND hwnd )
{
    ret = OLE_OK;
    lhClientDoc = 0;

    bObjectLoaded = FALSE;
    bUndoObjectLoaded = FALSE;

    pOleClient = NULL;
    lpObject = NULL;
    lpUndoObject = NULL;

    lstrcpy( lpszDocName , "noname.ole" );
    *lpszLastObjectName = 0;
    *lpszObjectName = 0;
    bDefDocName = TRUE;
    RegisterClientDoc();
    pOleClient = (TOleClient *) malloc( sizeof( TOleClient ));
    if ( pOleClient )
        MakeTOleClient( pOleClient, hwnd , hInst );
    else memerror(  );
}


void RegisterClientDoc(void)
{
    // Tip for using OleRegisterClientDoc:
   // If the lpszDoc parameter passed to
    // OleRegisterClientDoc is not valid, (lpszPatnName in this case),
    // one can get an OLE_ERROR_ADDRESS error, and the ClientDoc
    // handle will not be valid.

    ret = OleRegisterClientDoc(
            szAppName,
            lpszDocName,
            0,
            &lhClientDoc );
    check( ret );
}

void RegFileName( LPSTR FileName )
{
    lstrcpy( lpszDocName , FileName );
    ret = OleRegisterClientDoc( szAppName,
            lpszDocName ,
            0,
            &lhClientDoc );
    check ( ret );
}

void CMActivate( HWND hwnd )
{
    RECT rect;
    BackupObject();
    GetClientRect( hwnd, &rect );
    ret = OleActivate( lpObject , OLEVERB_PRIMARY, TRUE, TRUE ,
            hwnd , &rect );
    wait ( ret, lpObject );
    PostMessage( hwnd , WM_U_REDRAW, 0, 0L );
}

void WMInitMenu( HWND hwnd , WORD wParam )
{
    WORD wEnableUndo;
    HMENU hMenu = (HMENU)wParam;

    if ( (lpObject != lpUndoObject) && ( lpUndoObject != NULL ))
        wEnableUndo = MF_ENABLED;
    else wEnableUndo = MF_GRAYED;
    EnableMenuItem( hMenu, CM_UNDO     , wEnableUndo );
    EnableMenuItem( hMenu, CM_COPY     , ( bObjectLoaded ? MF_ENABLED : MF_GRAYED ));
    EnableMenuItem( hMenu, CM_CUT      , ( bObjectLoaded ? MF_ENABLED : MF_GRAYED ));
    ret = OleQueryCreateFromClip( "StdFileEditing", olerender_draw, 0 );
    EnableMenuItem( hMenu, CM_PASTE    , (( ret == OLE_OK ) ? MF_ENABLED : MF_GRAYED ));
    EnableMenuItem( hMenu, CM_ACTIVATE , ( bObjectLoaded ? MF_ENABLED : MF_GRAYED ));
    EnableMenuItem( hMenu, CM_CLEAR    , ( bObjectLoaded ? MF_ENABLED : MF_GRAYED ));

    DrawMenuBar( hwnd );
}

void CMClear( HWND hwnd )
{
    CloseCurrentOle(hwnd);
}

void CMAbout( HWND hwnd )
{
    MessageBox( hwnd , "OLE Client Example\nCopyright (c) 1992 Borland International, Inc.", szAppName, MB_OK );
}

void CloseCurrentOle( HWND hwnd )
{
    bObjectLoaded = FALSE;

    if ( lpObject ) {
        ret = OleDelete( lpObject );
        wait( ret , lpObject );
    }
    if ( lpUndoObject ) {
        ret = OleDelete( lpUndoObject );
        wait( ret , lpObject );
    }
    lpObject = lpUndoObject = NULL;

    InvalidateRect( hwnd , NULL, TRUE );
    UpdateWindow( hwnd );
}

void memerror(void)
{
    MessageBox( GetFocus() , "error allocating memory", szAppName, MB_OK );
    exit(1);
}

// General Help:
// Question: Right after closing down the server, the only part of the
//   object repainted in my application is that portion of the window that
//   was covered with the server program, what's going on?
// Answer: When the server closes, Windows sends you a paint message to
//     update that portion of your window which the server covered up.  It
//     has a clipping region defined which keeps all the previous visible
//     portions of your client window.  To repaint the whole window after
//     a server closes, respond to the OLE_CHANGED notification in your
//     callback, and force the whole window to be updated there.  Calling
//     InvalidateRect would be appropriate.

// _lopen will not create a new file.  Use OpenFile( .. , OF_CREATE ) or
// _lcreate for this.