/*
File: main.c
Description: Sample Button Plugin
Author: Image Capture Engineering
Copyright: (C) Copyright 2003 Apple Computer, Inc. All rights reserved.
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.
Change History (most recent first):
<1> 6/17/03 WN first file
*/
#include <Carbon/Carbon.h>
#include <CoreFoundation/CoreFoundation.h>
#include <mach/mach.h>
#include <pthread.h>
#include <time.h>
#define THREAD 0
#define DEBUG 0
typedef CALLBACK_API_C( void , ButtonPressedCallback )(OSType message,
UInt32* locationID,
UInt64* guid);
//-------------------------------------------------------------------------------------- MyDevice
typedef struct MyDevice
{
UInt32 sLocationID;
#if THREAD
pthread_t sUnsolEventProcThread;
#else
EventLoopTimerRef sTimerRef;
#endif
ButtonPressedCallback sButtonCallback;
} MyDevice;
// globals
MyDevice gMyDevice;
// prototypes
UInt8 PushButtonStatus();
void CancelThreads();
void *UnsolEventProcThreadEntryPoint(void *inParam);
void UnsolEventProcThreadCleanupHandler(void *inParam);
#pragma mark -
//-------------------------------------------------------------------------------------- PushButtonStatus
UInt8 PushButtonStatus()
{
KeyMap theKeys;
KeyMap f5Key = { 0x00000000, 0x0000000C, 0x00000000, 0x00000000 };
GetKeys(theKeys);
return (0 == memcmp(theKeys, f5Key, sizeof(KeyMap)));
}
//-------------------------------------------------------------------------------------- CancelThreads
void CancelThreads()
{
#if THREAD
int fStatus;
void *fResult;
// unblock thread processing unsol.status notifications and cancel it
fStatus = pthread_cancel( gMyDevice.sUnsolEventProcThread );
fStatus = pthread_join( gMyDevice.sUnsolEventProcThread, &fResult );
#endif
}
//-------------------------------------------------------------------------------------- UnsolEventProcThreadEntryPoint
void *UnsolEventProcThreadEntryPoint(void *inParam)
{
// printf( "UnsolEventProcThreadEntryPoint\n" );
#if THREAD
pthread_cleanup_push( UnsolEventProcThreadCleanupHandler, NULL );
while( 1 )
{
UInt32 button;
struct timespec sleepTime;
pthread_testcancel(); // check if the thread has been canceled
sleepTime.tv_sec = 1;
sleepTime.tv_nsec = 0;
button = PushButtonStatus();
if (button)
gMyDevice.sButtonCallback('but1', &gMyDevice.sLocationID, nil);
nanosleep(&sleepTime, 0);
}
pthread_cleanup_pop( 1 );
#else
#endif
return NULL;
}
//-------------------------------------------------------------------------------------- UnsolEventProcThreadCleanupHandler
void UnsolEventProcThreadCleanupHandler(void *inParam)
{
// printf( "UnsolEventProcThreadCleanupHandler\n" );
}
//-------------------------------------------------------------------------------------- TimerEvent
pascal void TimerEvent (EventLoopTimerRef inTimer,
void *inUserData)
{
UInt32 button;
button = PushButtonStatus();
if (button)
gMyDevice.sButtonCallback('but1', &gMyDevice.sLocationID, nil);
}
#pragma mark -
//-------------------------------------------------------------------------------------- TWAINButtonPluginStart
OSErr TWAINButtonPluginStart(UInt32* locationID,
UInt64* guid,
io_string_t twainPath,
ButtonPressedCallback callback)
{
IOReturn err = noErr;
#if DEBUG
printf("---------------------------------------\n");
printf(" TWAINButtonPluginStart\n");
printf("---------------------------------------\n");
#endif
memset(&gMyDevice, 0, sizeof(gMyDevice));
gMyDevice.sLocationID = *locationID;
require(err == noErr, bail);
gMyDevice.sButtonCallback = callback;
#if THREAD
err = pthread_create(
&gMyDevice.sUnsolEventProcThread,
NULL,
UnsolEventProcThreadEntryPoint,
NULL
);
#else
err = InstallEventLoopTimer( GetCurrentEventLoop(),
(kEventDurationSecond),
(kEventDurationSecond),
NewEventLoopTimerUPP(TimerEvent),
NULL,
&gMyDevice.sTimerRef);
#endif
bail:
#if DEBUG
if (err)
printf("exiting TWAINButtonPluginStart err = 0x%08x\n", err);
#endif
return err;
}
//-------------------------------------------------------------------------------------- TWAINButtonPluginStop
OSErr TWAINButtonPluginStop(UInt32* locationID,
UInt64* guid,
io_string_t twainPath)
{
#if DEBUG
printf("---------------------------------------\n");
printf(" TWAINButtonPluginStop\n");
printf("---------------------------------------\n");
#endif
#if THREAD
CancelThreads();
#else
RemoveEventLoopTimer(gMyDevice.sTimerRef);
#endif
return noErr;
}
|
