FileSharingOn.c

/*
    File:       FileSharingOn.c
    
    Description:This snippet demonstrates how to determine whether or not File Sharing is on.
 
    Author:     VMC
    
    Copyright:  Copyright: © 1996-1999 by Apple Computer, Inc.
                all rights reserved.
    
    Disclaimer: You may incorporate this sample code into your applications without
                restriction, though the sample code has been provided "AS IS" and the
                responsibility for its operation is 100% yours.  However, what you are
                not permitted to do is to redistribute the source as "DSC Sample Code"
                after having made changes. If you're going to re-distribute the source,
                we require that you make it clear in the source that the code was
                descended from Apple Sample Code, but that you've made changes.
    
    Change History (most recent first):
                6/25/99 Updated for Metrowerks Codewarror Pro 2.1(KG)
 
*/
#include <StandardFile.h>
#include "FileSharingOn.h"
 
/*****  globals *****/
Boolean                 gQuitTheApp = false;        /* true = quit program */
/*****  main() *****/
 
void main()
{
    short           sleepTime  =  60;
    EventRecord     myEvent;
 
    
    initApp();                              /* call initialization routine */
    setUpMenus();
    do
    {
        if (WaitNextEvent(everyEvent, &myEvent, sleepTime, NIL))
            switch (myEvent.what)
            {
                case mouseDown:
                    doMousedown(&myEvent);
                    break;
                    
                case keyDown:
                case autoKey:
                    doKey(&myEvent);
                    break;
 
                case kHighLevelEvent:
                    doHighLevel(&myEvent);
                    break;
 
                case activateEvt:
                    break;
                
                case updateEvt:
                    doUpdate(&myEvent);
                    break; 
                
                case diskEvt:
                    break;
            
                case osEvt:             /*  I don't really care yet. */
                    break;
            }
    }  while (!gQuitTheApp);        
    
}               /* end of main */
 
 
/*****  initApp() *****/
 
void initApp()
{
    
    /* Memory specific initializations. */
    
    MaxApplZone();              /* grow the heap to its maximum size */
    MoreMasters();              /* create more master pointers       */
    MoreMasters();
    MoreMasters();
    MoreMasters();
    MoreMasters();
 
    /* Initializing the ROM Managers */
    
    InitGraf((Ptr) &qd.thePort);
    InitFonts();
    InitWindows();
    InitMenus();
    FlushEvents(everyEvent,0);
    TEInit();
    InitDialogs(NIL);
    InitCursor();
    
    if (!checkGestaltFeatures())
        ExitToShell();
    
    /* Install the required Apple Event Handlers */
    if (!installAEHandlers())
        ExitToShell();
}               /* end of initApp() */
 
 
 
/*****  checkGestaltFeatures() *****/
Boolean checkGestaltFeatures()
{
    long        gestaltFeature;
    OSErr       myErr;
 
    myErr = Gestalt(gestaltSystemVersion, &gestaltFeature);     /* which SysVersion present? */
    if (myErr == noErr)
    {
        gestaltFeature = (gestaltFeature >> 8) & 0xf; 
                                        /* shift result over & mask out major version number */
        if (gestaltFeature < 7)         /* This is a System 7+ shell.  We quit otherwise. */
        {
            StopAlert(BADSYSTEMID, nil);
            return(false);
        }
    }
    
    if (myErr == noErr)
    {
        myErr = Gestalt(gestaltQuickdrawVersion, &gestaltFeature);
                                                    /* we want color QD cuz we're spoiled */
        if (myErr == noErr)
        {
            if(gestaltFeature < gestalt32BitQD)
            {
                StopAlert(BADQUICKDRAWID, nil);
                return(false);
            }
        }
    }
    
    
    
    if (myErr == noErr)
    {
        myErr = Gestalt(gestaltAppleEventsAttr, &gestaltFeature);
        if (myErr == noErr)
        {
            if (!(gestaltFeature & 0xf))
            {
                StopAlert(NOAPPLEEVENTS, nil);
                return(false);
            }
        }
    }
    if (!myErr)     
        return(true);           /* if there was an error we cannot continue */
    else
    {
        return(false);          /* we made it through without a hitch */
    }
}
 
/*****  installAEHandlers *****/
Boolean installAEHandlers()
{
    OSErr       myErr;
    
    myErr = AEInstallEventHandler ( kCoreEventClass, 
                    kAEOpenApplication, NewAEEventHandlerProc(DoOpenAppAE), 0L, false );
    if (myErr == noErr)
        myErr = AEInstallEventHandler ( kCoreEventClass,
                    kAEOpenDocuments, NewAEEventHandlerProc(DoOpenDocAE), 0L, false );
    if (myErr == noErr)
        myErr = AEInstallEventHandler ( kCoreEventClass,
                    kAEPrintDocuments, NewAEEventHandlerProc(DoPrintDocAE), 0L, false );
    if (myErr == noErr)
        myErr = AEInstallEventHandler ( kCoreEventClass,
                    kAEQuitApplication, NewAEEventHandlerProc(DoQuitAppAE), 0L, false );
    if (myErr)
        return(false);
    else
        return(true);
}
 
/*****  setUpMenus() 
            This will put up our menus.  Be sure to read the comments by the
            AppendMenu() and SetItem() calls to see how different options
            behave.     
*****/
void setUpMenus()
{
    short           n;
    MenuHandle      theMenu;
    
    for (n = 0; n < MAXMENUS; n++)
    {
        theMenu = GetMenu(FIRSTMENUID + n);
        if (theMenu)                
            InsertMenu(theMenu, 0);
    }
 
    theMenu = GetMenuHandle(APPLEMENU);
    if (theMenu)
        AppendResMenu(theMenu, 'DRVR');
    
    DrawMenuBar();
    return;
}                   /* end of setUpMenus()  */
 
/*****  setUpWindow() *****/
 
void setUpWindow( void )
{
    WindowPtr   myWind;
 
    myWind = GetNewCWindow(WINDOWID, nil, PUTINFRONT);
    if (myWind != nil)
    {
        ShowWindow(myWind);
    }
}
 
 
/*****  doMousedown()
            We figure out where the user has clicked the mouse.  If the user
            clicks anywhere but the menu bar, we beep.  Otherwise, we figure
            out which menu they have clicked and dispatch.
*****/
void doMousedown(EventRecord *eventRec)
{
    short       windPart;
    WindowPtr   myWind;
    long        menuResult;
    
    windPart = FindWindow(eventRec->where, &myWind);
    
    switch(windPart)
    {
        case inContent:
            SelectWindow(myWind);
            break;
 
        case inDrag:
            DragWindow( myWind, eventRec->where, &qd.screenBits.bounds );
            break;
 
        case inMenuBar:
            menuResult = MenuSelect(eventRec->where);
            dispatch(menuResult);
            break;
 
        case inSysWindow:
            SystemClick( eventRec, myWind );
            break;
            
        case inGoAway:
            gQuitTheApp = true;
            break;
            
        default:
            break;
    }
    return;
}               /* end of doMousedown */
 
 
/*****  doKey()
            We ignore keys pressed unless they are accompanied by a 
            command key.  Then we dispatch.
*****/
void doKey(EventRecord *eventRec)
{
    char    keyPressed;
    long    menuResult;
    
    keyPressed = (char) (eventRec->message & charCodeMask);
    
    if((eventRec->modifiers & cmdKey) != 0)
    {
        menuResult = MenuKey(keyPressed);
        dispatch(menuResult);   
    }
    return;
}               /* end of do_key */
 
 
/*****  doHighLevel() *****/
void doHighLevel(EventRecord *eventRec)
{
    OSErr myErr;
    myErr = AEProcessAppleEvent(eventRec);
}
 
 
pascal OSErr    DoOpenAppAE(AppleEvent theAppleEvent, AppleEvent reply, long refCon)
{
    #pragma unused(theAppleEvent, reply, refCon)
    
    setUpWindow();
    return(noErr);
}
pascal OSErr    DoOpenDocAE(AppleEvent theAppleEvent, AppleEvent reply, long refCon)
{
    #pragma unused(theAppleEvent, reply, refCon)
    
    return(noErr);
}
pascal OSErr    DoPrintDocAE(AppleEvent theAppleEvent, AppleEvent reply, long refCon)
{
    #pragma unused(theAppleEvent, reply, refCon)
    
    return(noErr);
}
pascal OSErr    DoQuitAppAE(AppleEvent theAppleEvent, AppleEvent reply, long refCon)
{
    #pragma unused(theAppleEvent, reply, refCon)
    
    gQuitTheApp = true;
    return(noErr);
}
 
 
/***** doUpdate() *****/
void    doUpdate(EventRecord *eventRec)
{
    GrafPtr     savedPort;
    WindowPtr   theWindow;
    theWindow = (WindowPtr) eventRec->message;
    
    GetPort(&savedPort);
    SetPort((GrafPtr) theWindow);
    BeginUpdate(theWindow);
    EndUpdate(theWindow);
    SetPort(savedPort);
}
 
 
/*****  dispatch()
            We determine which menu the user has chosen (either with mouse
            or with command keys) and jump to the routine that handles
            that menu's commands.
*****/
void dispatch(long menuResult)
{
    short       theMenu;            /* menu selected */
    short       theItem;            /* item selected */
    
    theMenu = HiWord (menuResult);      /* menuID selected */
    theItem = LoWord (menuResult);      /* item# selected */
    
    switch (theMenu)
    {
        case APPLEMENU:
            doAppleCmds(theItem);
            break;
 
        case FILEMENU:
            doFileCmds(theItem);
            break;
            
        case EDITMENU:
            break;
 
        case TESTMENU:
            doTestCmds(theItem);
            break;
    }
    HiliteMenu(0);
}               /* end of dispatch */
 
 
 
/*****  doAppleCmds() 
            When the user chooses the "About MyMenuText" item, we display the
            About box.  If the user chooses a DA, we open the DA.
*****/
void doAppleCmds(short theItem)
{   
    MenuHandle      myMenu;
    Str255          name;
    short           dummy;
    
    if(theItem == appleABOUT)
    {
        Alert(ABOUTID, (ModalFilterUPP) NIL);
    }
    else
    {
        myMenu = GetMenuHandle (APPLEMENU);
        if (myMenu)
        {
            GetMenuItemText(myMenu, theItem, name);
            dummy = OpenDeskAcc(name);
        }
    }
    return;
}               /* end of doAppleCmds */
 
 
 
/*****  doFileCmds() 
            When the user chooses Quit on the File menu, we quit.
*****/
void doFileCmds (short theItem)
{
    switch (theItem)
    {           
        case fileQUIT:
            gQuitTheApp = true;
            break;
    }
    return;
} /* end of doFileCmds */
 
 
 
/*****  doTestCmds()
            When the user chooses the item in the Test menu, they
            will get to choose a folder with a custom icon
*****/
void doTestCmds (short theItem)
{   
    
    switch (theItem)
    {
        case testDOTHETEST:
            theTest();
            break;          
    }   
    return;
}               /* end of doTestCmds */
 
 
void theTest()
{
    Boolean     sharingOn;
    
    sharingOn = sharingIsOn();
 
    if (sharingOn)
        DebugStr("\pSharing is on.");
}
 
 
/*
    This is a C version of code in Inside Mac:Files for determining
    if FileSharing is active on a particular Macintosh.
    sharingIsOn indexes through all the local volumes on
    a Macintosh with PBHGetVInfo(), so we can obtain true volume
    reference number information.  We can take the vRefNum we obtain
    and pass it to the volIsSharable() routine until we find a volume
    for which FileSharing is truly active.  If we get an error, for
    example, if we run out of volumes and get an error -35 (nsvErr), 
    or if we find that FileSharing is active on a volume, then we drop
    out of our while loop and return the results.
*/
Boolean sharingIsOn()
{
    Boolean         sharing = false;
    HParamBlockRec  myHPB;
    OSErr           myErr;
    short           volIndex = 1;
    
    do
    {
        myHPB.volumeParam.ioNamePtr = nil;
        myHPB.volumeParam.ioVolIndex = volIndex;
        
        myErr = PBHGetVInfoSync(&myHPB);
        if (myErr == noErr)
            sharing = volIsSharable(myHPB.volumeParam.ioVRefNum);
        volIndex++;
    } while ((myErr == noErr) && (!sharing));
    
    return(sharing);
}
 
/*
    volIsSharable lets us know if the bHasPersonalAccessPrivileges bit
    of the vMAttrib field of the GetVolParmsInfoBuffer is set, which 
    indicates that FileSharing is active.
*/
Boolean volIsSharable(short vRefNum)
{
    HParamBlockRec          myHPB;
    GetVolParmsInfoBuffer   myInfoBuffer;
    OSErr                   myErr;
    
    myHPB.ioParam.ioNamePtr = nil;
    myHPB.ioParam.ioVRefNum = vRefNum;
    myHPB.ioParam.ioBuffer = (Ptr) &myInfoBuffer;
    myHPB.ioParam.ioReqCount = sizeof(GetVolParmsInfoBuffer);
    
 
    myErr = PBHGetVolParmsSync(&myHPB);
 
    if (myErr == noErr)
    {
        if (((myInfoBuffer.vMAttrib) & (1L << bHasPersonalAccessPrivileges)) != 0)
            return(true);
        else
            return(false);
    }
    else
        return(false);
}


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