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Retired Document

Important: This sample code may not represent best practices for current development. The project may use deprecated symbols and illustrate technologies and techniques that are no longer recommended.

main.c

/*

    File:       main.c

    Abstract:   iTunesControllermakes use of the RegisterEventHotKey API to retrieve and process

                hotkeys, then calling through to an AppleScript to control iTunes.

                RegisterEventHotKey  allows the application to get hotkey events while in the

                background or foregroud.  The PostHotKeyKeyboardEvent function demonstrates how to

                turn off hotkeys, post keys with CGPostKeyboardEvent, and reenable them to prevent

                a circular dependency.

    Version:    1.0

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

                use, installation, modification or redistribution of this Apple software

                constitutes acceptance of these terms.  If you do not agree with these terms,

                please do not use, install, modify or redistribute this Apple software.

                In consideration of your agreement to abide by the following terms, and subject

                to these terms, Apple grants you a personal, non-exclusive license, under Apple's

                copyrights in this original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or without

                modifications, in source and/or binary forms; provided that if you redistribute

                the Apple Software in its entirety and without modifications, you must retain

                this notice and the following text and disclaimers in all such redistributions of

                the Apple Software.  Neither the name, trademarks, service marks or logos of

                Apple Computer, Inc. may be used to endorse or promote products derived from the

                Apple Software without specific prior written permission from Apple.  Except as

                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

                CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

                GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

                ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

                OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

                (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

                ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    Copyright © 2006 Apple Computer, Inc., All Rights Reserved

*/

#include <Carbon/Carbon.h>

#include <sys/sysctl.h>

static  WindowRef   DisplayITunesControlWindow();

OSStatus    DrawTextHandler(EventHandlerCallRef nextHandler, EventRef theEvent, void* userData);

void    PeriodicTimerAction (EventLoopTimerRef  theTimer, void* userData);

Boolean FindiTunes();

Boolean RestorePrefs( WindowRef window );

static  void    SavePrefs( WindowRef window );

static  OSStatus    ITunesControlWindowEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void *inUserData );

static  OSStatus    HotKeyEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData );

static  OSStatus    ApplicationEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void *inUserData );

void    DisplayAboutBox();

void    MakeMeTheFrontProcess();

void    RegisterHotKeys( Boolean registerKeys );

void    PostHotKeyKeyboardEvent( CGKeyCode virtualKey );

void    SetControlCString( WindowRef window, OSType signature, SInt32 id, char *cString );

OSStatus    GetControlBySigAndID( WindowRef window, OSType  signature, SInt32 id, ControlRef *control );

struct GlobalAppInfo

    CFBundleRef             mainBundle;

    IBNibRef                nibRef;

    CFMutableStringRef      titleString;

    CFMutableStringRef      artistAlbumString;

};

typedef struct GlobalAppInfo GlobalAppInfo;

GlobalAppInfo       g;

int main( int argc, char* argv[] )

    WindowRef               window;

    HIViewRef               hiViewRef;

    OSStatus                err;

    const   EventTypeSpec   applicationEvents[] = { { kEventClassApplication, kEventAppFrontSwitched }, { kEventClassCommand, kEventCommandProcess }    };

    const   EventTypeSpec   hotKeyEvents[]      = { { kEventClassKeyboard, kEventHotKeyPressed }, { kEventClassKeyboard, kEventHotKeyReleased } };

    g.titleString       = CFStringCreateMutable( kCFAllocatorDefault, 0 );          //  Initialize globals

    g.artistAlbumString = CFStringCreateMutable( kCFAllocatorDefault, 0 );

    g.mainBundle        = CFBundleGetMainBundle();

    err = CreateNibReference( CFSTR("main"), &g.nibRef );                   if ( err != noErr ) goto Bail;

    err = SetMenuBarFromNib( g.nibRef, CFSTR("MenuBar") );                  if ( err != noErr ) goto Bail;

    window  = DisplayITunesControlWindow();                                 if ( window == NULL )   goto Bail;

    //  Install a timer, PeriodicTimerAction(), which fires 2 times a second to get latest song, album, artist, information from iTunes

    GetControlBySigAndID( window, 'hivw', 100, &hiViewRef);

    InstallEventLoopTimer( GetMainEventLoop(), 0,  kEventDurationSecond / 2, NewEventLoopTimerUPP(PeriodicTimerAction), hiViewRef, NULL );

    InstallApplicationEventHandler( NewEventHandlerUPP(HotKeyEventHandlerProc), GetEventTypeCount(hotKeyEvents), hotKeyEvents, 0, NULL );

    InstallApplicationEventHandler( NewEventHandlerUPP(ApplicationEventHandlerProc), GetEventTypeCount(applicationEvents), applicationEvents, 0, NULL );

    RegisterHotKeys( true );                                                        //  Register to receive our HotKeys

    RunApplicationEventLoop();

    SavePrefs( GetFrontWindowOfClass( kUtilityWindowClass, true ) );                //  Save window preferences on quit

Bail:

    return( 0 );

//  Creates and displays our floating iTunes status window.

static  WindowRef   DisplayITunesControlWindow()

    HIViewRef               hiViewRef;

    WindowRef               window;

    OSStatus                err;

    HISize                  minWindowSize   = { 192, 32 };

    const   EventTypeSpec   controlEvents[] = { { kEventClassControl, kEventControlDraw }, { kEventClassControl, kEventControlClick } };

    const   EventTypeSpec   windowEvents[]  = { { kEventClassWindow, kEventWindowClose } };

    err = CreateWindowFromNib( g.nibRef, CFSTR("MainWindow"), &window );    if ( err != noErr ) return( NULL );

    (void) SetWindowResizeLimits( window, &minWindowSize, NULL );                   //  Set the minimum allowable size of the window

    err = InstallWindowEventHandler( window, NewEventHandlerUPP( ITunesControlWindowEventHandlerProc ), GetEventTypeCount(windowEvents), windowEvents, window, NULL );

    GetControlBySigAndID( window, 'hivw', 100, &hiViewRef);

    (void) InstallControlEventHandler( hiViewRef, NewEventHandlerUPP(DrawTextHandler), GetEventTypeCount(controlEvents), controlEvents, hiViewRef, NULL );

    if ( RestorePrefs( window ) == false )  DisplayAboutBox();                      //  If run the first time, show the About Box first for instructions

    ShowWindow( window );

    return( window );

static  OSStatus    ApplicationEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void *inUserData )

    #pragma unused ( inCallRef, inUserData )

    WindowRef                   window;

    HICommand                   command;

    OSStatus                    err                 = eventNotHandledErr;

    UInt32                      eventClass          = GetEventClass( inEvent );

    UInt32                      eventKind           = GetEventKind(inEvent);

    if ( eventClass == kEventClassApplication )

        //  If iTunes is the frontmost application, unregister our hotkeys since they match iTunes.  Otherwise we would generate double events

        if ( eventKind == kEventAppFrontSwitched )

            ProcessSerialNumber     psn;

            ProcessInfoRec          processInfo = { 0 };

            processInfo.processInfoLength       = sizeof( processInfo );

            GetFrontProcess( &psn );

            GetProcessInformation( &psn, &processInfo );

            if ( processInfo.processSignature == 'hook' )   RegisterHotKeys( false );           //  Unregister our hotkeys, iTunes is frontmost

            else                                            RegisterHotKeys( true );            //  Make sure our hotkeys are registered

    else if ( eventClass == kEventClassCommand )

        GetEventParameter( inEvent, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &command );

        if ( command.commandID == kHICommandNew )

            window  = GetFrontWindowOfClass( kUtilityWindowClass, false );

            if ( window != NULL )   ShowWindow(window);                                         //  New simply shows the window, a close will hide it, never disposing the window

            err = noErr;

        else if ( command.commandID == kHICommandAbout )

            DisplayAboutBox();

            err = noErr;

    return( err );

void    DisplayAboutBox()

    OSErr                   err;

    NumVersion              version;

    WindowRef               window;

    Str255                  s;

    IBNibRef                nibRef;

    err = CreateNibReference( CFSTR("main"), &nibRef );                 if ( err != noErr ) goto Bail;

    err = CreateWindowFromNib( nibRef, CFSTR("AboutBox"), &window );    if ( err != noErr ) goto Bail;

    DisposeNibReference( nibRef );

    *((UInt32*)&version)    = CFBundleGetVersionNumber( g.mainBundle );                         //  Display the version number in our About Box

    if ( (version.minorAndBugRev & 0x0F) != 0 ) sprintf( (char*)s, "%d.%d.%d", version.majorRev, version.minorAndBugRev >> 4, version.minorAndBugRev & 0x0F );

    else                                        sprintf( (char*)s, "%d.%d", version.majorRev, version.minorAndBugRev >> 4 );

    SetControlCString( window, 'STxt', 1, (char*)s );

    ShowWindow( window );

Bail:

    return;

//  RegisterHotKeys is responsible for registering for ther hotkeys we are interested in, as well as unregistering for those keys.

void    RegisterHotKeys( Boolean registerKeys )

    static  Boolean             hotKeysRegistered;                                              //  Static to remember if HotKeys are registered

    static  EventHotKeyRef      eventHotKeyRef[5];

    if ( registerKeys == true )

        if ( hotKeysRegistered == false )

            EventHotKeyID           rightArrowID        = { 'Arow', 1 };                        //  rightArrowID is defined as our EventHotKeyID 'Arow' 1

            EventHotKeyID           leftArrowID         = { 'Arow', 2 };

            EventHotKeyID           upArrowID           = { 'Arow', 3 };

            EventHotKeyID           downArrowID         = { 'Arow', 4 };

            EventHotKeyID           numberPadZeroID     = { 'Arow', 5 };

            RegisterEventHotKey( 124, cmdKey, rightArrowID, GetApplicationEventTarget(), 0, &eventHotKeyRef[0] );   //  <command><right arrow>, right arrow has a virtual key code of 124

            RegisterEventHotKey( 123, cmdKey, leftArrowID, GetApplicationEventTarget(), 0, &eventHotKeyRef[1] );

            RegisterEventHotKey( 126, cmdKey, upArrowID, GetApplicationEventTarget(), 0, &eventHotKeyRef[2] );

            RegisterEventHotKey( 125, cmdKey, downArrowID, GetApplicationEventTarget(), 0, &eventHotKeyRef[3] );

            RegisterEventHotKey( 82, cmdKey, numberPadZeroID, GetApplicationEventTarget(), 0, &eventHotKeyRef[4] );

            hotKeysRegistered   = true;

    else if ( registerKeys == false )

        if ( hotKeysRegistered == true )

            UnregisterEventHotKey( eventHotKeyRef[0] );                                         //  Unregister our hot keys

            UnregisterEventHotKey( eventHotKeyRef[1] );

            UnregisterEventHotKey( eventHotKeyRef[2] );

            UnregisterEventHotKey( eventHotKeyRef[3] );

            UnregisterEventHotKey( eventHotKeyRef[4] );

            hotKeysRegistered   = false;

    return;

//  We execute our AppleScript code to communicate with iTunes via the command line tool osascript.

#define NEXT_TRACK "osascript -e 'tell application \"iTunes\"' -e 'next track' -e 'end tell'"

#define BACK_TRACK "osascript -e 'tell application \"iTunes\"' -e 'back track' -e 'end tell'"           //  back track - go to beginning of current track, or previous track if at beginning of current.

#define PREVIOUS_TRACK "osascript -e 'tell application \"iTunes\"' -e 'previous track' -e 'end tell'"   //  previous track - start playing previous track

#define PAUSE "osascript -e 'tell application \"iTunes\"' -e 'pause' -e 'end tell'"

#define PLAY "osascript -e 'tell application \"iTunes\"' -e 'play' -e 'end tell'"

#define PLAYPAUSE "osascript -e 'tell application \"iTunes\"' -e 'playpause' -e 'end tell'"             //  playpause - toggle play/pause of current track, a.k.a. space bar

#define VOLUME_UP "osascript -e 'tell application \"iTunes\"' -e 'set currentVolume to sound volume' -e 'if currentVolume is greater than 90 then' -e 'set currentVolume to 100' -e 'end if' -e 'set sound volume to \(currentVolume + 10\)' -e 'end tell'"

#define VOLUME_DOWN "osascript -e 'tell application \"iTunes\"' -e 'set currentVolume to sound volume' -e 'if currentVolume is less than 10 then' -e 'set currentVolume to 0' -e 'end if' -e 'set sound volume to \(currentVolume - 10\)' -e 'end tell'"

static  OSStatus    HotKeyEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void* inUserData )

    #pragma unused ( inCallRef, inUserData )

    EventHotKeyID           hotKeyID;

    OSStatus                err         = eventNotHandledErr;

    UInt32                  eventClass  = GetEventClass( inEvent );

    UInt32                  eventKind   = GetEventKind( inEvent );

    switch ( eventClass )

        case kEventClassKeyboard:

            if ( eventKind == kEventHotKeyPressed )

                GetEventParameter( inEvent, kEventParamDirectObject, typeEventHotKeyID, NULL, sizeof(EventHotKeyID), NULL, &hotKeyID );

                if ( hotKeyID.signature == 'Arow' )

                    switch ( hotKeyID.id )

                        case 1:                                                                 //  1-5 values defined in RegisterHotKeys(), 'Arow' (1), etc.

                            system( NEXT_TRACK );                                               //  system() executes command line arguments, executable from the Terminal

                            PostHotKeyKeyboardEvent( (CGKeyCode) 124 );                         //  124 = virtual key code for the "right arrow" also used in RegisterHotKeys()

                            break;

                        case 2:

                            system( BACK_TRACK );

                            PostHotKeyKeyboardEvent( (CGKeyCode) 123 );

                            break;

                        case 3:

                            system( VOLUME_UP );

                            PostHotKeyKeyboardEvent( (CGKeyCode) 126 );

                            break;

                        case 4:

                            system( VOLUME_DOWN );

                            PostHotKeyKeyboardEvent( (CGKeyCode) 125 );

                            break;

                        case 5:

                            system( PLAYPAUSE );

                            PostHotKeyKeyboardEvent( (CGKeyCode) 82 );

                            break;

            break;

    return( err );

//  Let's say we register for <command>-P events.  If we're the background application we *may* want to forward those events onto the frontmost

//  application, so that they can process the event and print.  To do this, we have to first unregister for the event, post the event using

//  CGPostKeyboardEvent, and then reregister.  If we don't unregister first, we will end up posting the event, and catching it ourselves again and again.

void    PostHotKeyKeyboardEvent( CGKeyCode virtualKey )

    RegisterHotKeys( false );                                       //  Unregister the hot keys, so that we don't catch our own posted key events

    CGPostKeyboardEvent( (CGCharCode)0, (CGKeyCode)55, true );      //  command down

    CGPostKeyboardEvent( (CGCharCode)0, virtualKey, true );         //  key down

    CGPostKeyboardEvent( (CGCharCode)0, virtualKey, false );        //  key up

    CGPostKeyboardEvent( (CGCharCode)0, (CGKeyCode)55, false );     //  command up

    RegisterHotKeys( true );                                        //  Re-register for the hotkeys

OSStatus DrawTextHandler( EventHandlerCallRef nextHandler, EventRef theEvent, void* userData )

    HIRect                  windowBounds;

    HIRect                  titleBounds;

    HIRect                  artistAlbumBounds;

    CGContextRef            context;

    OSStatus                err                 = noErr;

    float                   titleHeight         = 0;

    UInt32                  eventKind           = GetEventKind(theEvent);

    HIViewRef               hiViewRef           = (HIViewRef) userData;

    HIThemeTextInfo         titleTextInfo       = { 0, kThemeStateActive, kThemeSmallEmphasizedSystemFont, kHIThemeTextHorizontalFlushCenter, kHIThemeTextVerticalFlushCenter, kHIThemeTextBoxOptionStronglyVertical, kHIThemeTextTruncationNone, 0, false };

    HIThemeTextInfo         artistAlbumTextInfo = { 0, kThemeStateActive, kThemeSmallSystemFont, kHIThemeTextHorizontalFlushCenter, kHIThemeTextVerticalFlushTop, kHIThemeTextBoxOptionStronglyVertical, kHIThemeTextTruncationNone, 0, false };

    switch ( eventKind )

        case kEventControlDraw:

            GetEventParameter( theEvent, kEventParamCGContextRef, typeCGContextRef, NULL, sizeof(context), NULL, &context );

            err = HIViewGetBounds ( hiViewRef, &windowBounds );

            err = HIViewGetBounds ( hiViewRef, &titleBounds );

            err = HIThemeGetTextDimensions( g.titleString, 0, &titleTextInfo, NULL, &titleHeight, NULL );

            titleBounds.size.height = titleHeight + 4;

            err     = HIViewGetBounds ( hiViewRef, &artistAlbumBounds );

            artistAlbumBounds.origin.y  = titleBounds.size.height;

            artistAlbumBounds.size.height   = windowBounds.size.height - titleBounds.size.height;

            if ( g.titleString )        HIThemeDrawTextBox( g.titleString, &titleBounds, &titleTextInfo, context, kHIThemeOrientationNormal );

            if ( g.artistAlbumString )  HIThemeDrawTextBox( g.artistAlbumString, &artistAlbumBounds, &artistAlbumTextInfo, context, kHIThemeOrientationNormal );

            break;

        case kEventControlClick:

            MakeMeTheFrontProcess();                            //  Bring the application to the front when our floating window is clicked

            break;

        default:

            break;

    return( err );

void    PeriodicTimerAction( EventLoopTimerRef theTimer, void* userData )

    CFMutableStringRef      artistAlbumReplacement;

    CFMutableStringRef      tempAlbum;

    FILE                    *osascript_pipe;

    char                    fileBuffer[4096];

    CFArrayRef              stringArray;

    CFStringRef             playerState;

    CFURLRef                appleScriptURL;

    CFStringRef             appleScriptPath;

    CFStringRef             bufferString        = NULL;

    HIViewRef               hiViewRef           = (HIViewRef) userData;

    static  char            theCommand[4096]    = "osascript ";

    size_t                  bytesRead           = 0;

    if ( FindiTunes() == false )

        CFStringReplaceAll( g.titleString, CFSTR("iTunes not running...") );

        CFStringReplaceAll( g.artistAlbumString, CFSTR("") );

        HIViewSetNeedsDisplay( hiViewRef, true );

        return;

    if ( strlen( theCommand ) < 12 )

        appleScriptURL      = CFBundleCopyResourceURL( g.mainBundle, CFSTR("GetiTunesInfo.applescript"), NULL, NULL );  if ( appleScriptURL == NULL )   goto Bail;

        appleScriptPath     = CFURLCopyPath( appleScriptURL );

        strcat( theCommand, CFStringGetCStringPtr( appleScriptPath, CFStringGetSystemEncoding() ) );

        CFRelease( appleScriptPath );   CFRelease( appleScriptURL );

    //  popen executes command line arguments, and receives stdout stream in "osascript_pipe"

    osascript_pipe  = popen( theCommand, "r" );     if ( osascript_pipe == NULL )   goto Bail;

    bytesRead   = fread( fileBuffer, sizeof(char), sizeof(fileBuffer), osascript_pipe );    //  Read the output of the popen() command into fileBuffer

    fileBuffer[bytesRead-1] = '\0';

    pclose( osascript_pipe );                                                               //  Close the pipe opened by popen

    //  Parse strings out of returned AppleScript data

    bufferString    = CFStringCreateWithCString( kCFAllocatorDefault, fileBuffer, CFStringGetSystemEncoding());         if ( bufferString == NULL ) goto Bail;

    stringArray     = CFStringCreateArrayBySeparatingStrings( kCFAllocatorDefault, bufferString, CFSTR ("**"));         if ( stringArray == NULL ) goto Bail;

    playerState     = CFArrayGetValueAtIndex( stringArray, 0 );

    //  If playing, look for stream or track data

    if ( CFStringCompare( playerState, CFSTR("playing"), kCFCompareCaseInsensitive ) == 0 )

        // Retrieve the rest of the strings so everything will get released correctly

        CFStringRef streamTitle = CFArrayGetValueAtIndex(stringArray, 1);

        CFStringRef trackTitle  = CFArrayGetValueAtIndex(stringArray, 2);

        CFStringRef trackArtist = CFArrayGetValueAtIndex(stringArray, 3);

        CFStringRef trackAlbum  = CFArrayGetValueAtIndex(stringArray, 4);

        // If no stream title, we're playing a local track

        if ( CFStringCompare( streamTitle, CFSTR("missing value"), kCFCompareCaseInsensitive ) == 0 )

            CFStringReplaceAll( g.titleString, trackTitle);

            artistAlbumReplacement  = CFStringCreateMutableCopy( kCFAllocatorDefault, 0,  trackArtist );

            CFStringAppend( artistAlbumReplacement, CFSTR("\n") );

            tempAlbum   = CFStringCreateMutableCopy(kCFAllocatorDefault, 0,  trackAlbum );

            CFStringAppend( tempAlbum, CFSTR("\"") );

            CFStringInsert( tempAlbum, 0, CFSTR("\"") );

            CFStringAppend( artistAlbumReplacement, tempAlbum );

            CFStringReplaceAll( g.artistAlbumString, artistAlbumReplacement );

            CFRelease( tempAlbum );

            CFRelease( artistAlbumReplacement );

        else

            CFStringReplaceAll( g.titleString, streamTitle );

            artistAlbumReplacement  = CFStringCreateMutableCopy(kCFAllocatorDefault, 0,  trackTitle );

            CFStringReplaceAll( g.artistAlbumString, trackTitle );

            CFRelease( artistAlbumReplacement );

    else if ( CFStringCompare( playerState, CFSTR("paused"), kCFCompareCaseInsensitive ) == 0 )

        CFStringReplaceAll( g.titleString, CFSTR("iTunes is paused...") );

        CFStringReplaceAll( g.artistAlbumString, CFSTR("") );

    else if ( CFStringCompare( playerState, CFSTR("stopped"), kCFCompareCaseInsensitive ) == 0 )

        CFStringReplaceAll( g.titleString, CFSTR("iTunes is stopped...") );

        CFStringReplaceAll( g.artistAlbumString, CFSTR("") );

    if ( stringArray != NULL )  CFRelease( stringArray );

    if ( bufferString != NULL ) CFRelease( bufferString );

    HIViewSetNeedsDisplay( hiViewRef, true );

    return;

Bail:

    CFStringReplaceAll( g.titleString, CFSTR("Error communicating with iTunes...") );

    CFStringReplaceAll( g.artistAlbumString, CFSTR("") );

    if ( bufferString != NULL ) CFRelease( bufferString );

    HIViewSetNeedsDisplay( hiViewRef, true );

    return;

//  Return "true" if iTunes is running.

Boolean FindiTunes()

    OSErr                   err;

    ProcessInfoRec          processInfo = { 0 };

    ProcessSerialNumber     psn         = { kNoProcess, kNoProcess };

    processInfo.processInfoLength       = sizeof( processInfo );

    for ( ; ; )

        err = GetNextProcess( &psn );                           if ( err != noErr ) goto Bail;

        err = GetProcessInformation( &psn, &processInfo );      if ( err != noErr ) goto Bail;

        if ( processInfo.processSignature == 'hook' )                                   //  iTunes Signature

            return( true );

Bail:

    return( false );

static  OSStatus    ITunesControlWindowEventHandlerProc( EventHandlerCallRef inCallRef, EventRef inEvent, void *inUserData )

    #pragma unused ( inCallRef )

    OSStatus        err             = eventNotHandledErr;

    WindowRef       window          = (WindowRef) inUserData;

    UInt32          eventClass      = GetEventClass( inEvent );

    UInt32          eventKind       = GetEventKind(inEvent);

    switch ( eventClass )

        case kEventClassWindow:

            if ( eventKind == kEventWindowClose )

                HideWindow( window );                                                   //  Rather than dispose the window, we just hide it, and return noErr

                err = noErr;

            break;

    return( err );

void    SavePrefs( WindowRef window )

    OSStatus            err;

    Rect                windowBounds;

    CFDataRef           windowBoundsDataRef;

    if ( window == NULL )   goto Bail;

    err = GetWindowBounds( window, kWindowStructureRgn, &windowBounds );        if ( err != noErr ) goto Bail;

    windowBoundsDataRef = CFDataCreate( kCFAllocatorDefault, (UInt8 *)&windowBounds, sizeof(Rect) );

    CFPreferencesSetAppValue( CFSTR("WindowSize"), windowBoundsDataRef, kCFPreferencesCurrentApplication );     //  Save the window bounds as CFData

    CFPreferencesAppSynchronize( kCFPreferencesCurrentApplication );

    CFRelease( windowBoundsDataRef );

Bail:

    return;

Boolean RestorePrefs( WindowRef window )

    CFDataRef           windowBoundsDataRef;

    Rect                windowBounds;

    windowBoundsDataRef = CFPreferencesCopyAppValue( CFSTR("WindowSize"), kCFPreferencesCurrentApplication );

    if ( windowBoundsDataRef == NULL )  goto Bail;

    CFDataGetBytes( windowBoundsDataRef, CFRangeMake( 0, CFDataGetLength(windowBoundsDataRef) ), (UInt8 *)&windowBounds );

    SetWindowBounds( window, kWindowStructureRgn, &windowBounds );                                              //  Restore the window bounds

    CFRelease( windowBoundsDataRef );

    return( true );

Bail:

    return( false );

OSStatus    GetControlBySigAndID( WindowRef window, OSType  signature, SInt32 id, ControlRef *control )

    ControlID   controlID   = { signature, id };

    return( GetControlByID( window, &controlID, control ) );

void    SetControlCString( WindowRef window, OSType signature, SInt32 id, char *cString )

    ControlRef      control;

    GetControlBySigAndID( window, signature, id, &control );

    if ( control == NULL ) goto Bail;

    (void) SetControlData( control, 0, kControlStaticTextTextTag, strlen(cString), cString );

Bail:

    return;

//  Bring THIS process to the front

void    MakeMeTheFrontProcess()

    ProcessSerialNumber psn;

    OSErr               err;

    err = GetCurrentProcess( &psn );

    if ( err == noErr )

        (void) SetFrontProcess( &psn );

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