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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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<title>SuperSnapshot - /Snapshot.h</title>
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/LegacyTechnologies/index.html">Legacy Documents</a> > <a href="../../samplecode/LegacyTechnologies/idxGraphicsImaging-date.html">Graphics & Imaging</a> > <A HREF="javascript:location.replace('index.html');">SuperSnapshot</A> >
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<div style="width:100%; position:fixed;"><div align="center" id="watermark" style="position: relative; margin-left:auto; margin-right:auto; z-index:20; width:500px;"><div class="legacybox"><h1>Legacy Document<span class=closebutton><a href="javascript:closeWatermark()"><img src="../../images/closebutton.png" width="14" height="14" border="0" alt="close button"></a></span></h1>
<p><strong>Important: </strong>This document is part of the Legacy section of the ADC Reference Library. This information should not be used for new development.</p>
<div class="reflibtopic">
<p>Current information on this Reference Library topic can be found here:</p>
<ul>
<li><a href="http://developer.apple.com/referencelibrary/GraphicsImaging/index.html" target="_blank">Reference Library > Graphics & Imaging</a></li>
</ul>
</div>
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<h2>/Snapshot.h</h2>
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<option value="listing1.html">/AEventStuff.c</option>
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<p><strong><a href="SuperSnapshot.zip">Download Sample</a></strong> (“SuperSnapshot.zip”, 133.2K)<BR>
<strong><a href="SuperSnapshot.dmg">Download Sample</a></strong> (“SuperSnapshot.dmg”, 204.6K)</p>
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<!--googleon: index -->
<pre class="sourcecodebox">/*
File: Snapshot.h
Contains: This application demonstrates how to quickly and
efficiently capture the main device's desktop into
a window. The program basically reads the image
stored in the the main device's pixmap then copies
it to a custom pixmap. The custom pixmap is de-
fined at the same depth of the main device and
contains an identical copy of that device's color-
table. This is done to provide the fastest
performance possible when copying from an offscreen
to onscreen pixmap. By making sure the pixel values
map to the exact same colors in both colortables,
copybits will do a direct transfer of bits without
wasting time remapping the colors. Also the ctSeed
field for each colortable should be the same. Finally,
since the main device's bounding rect is different
than that of the offscreen's, the copying performance
for the device to the offscreen is slightly affected
because of the scaling required. However, the copying
performance for the offscreen to the window is the
best possible since the bounding rects for each are
identical.
(Updated Description)
While "carbonizing" this particular sample, I decided
to add a bunch of "bells and whistles" to the sample
which I had seen in other samples. In addition, I decided
to do a near "full" carbonization of the sample. I've
added some "conditional" logic so that the menus will
appear correctly for OS 9 and X (no File->Quit menu
under X). I also added support for the "Quit" AppleEvent,
so that under OS X selecting "Application Menu"->Quit would
exit the program. In addition, dynamic resizing of windows,
setting the size of the windows, saving the screenshot to
a pict file, refreshing the snapshot, as well as multiple
windows were all added to the program. Lastly, on OS 9,
a menu items will set the desktop picture using Apple
Events. While on OS X, a full screen mode display of a
snapshot will be displayed (since the method to set the
desktop picture on OS X was not available at the time
of this writing).
Written by: JM
Copyright: Copyright © 1991-2000 by Apple Computer, Inc., All Rights Reserved.
You may incorporate this Apple sample source code into your program(s) without
restriction. This Apple sample source code has been provided "AS IS" and the
responsibility for its operation is yours. You are not permitted to redistribute
this Apple sample source code as "Apple sample source 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 source
code, but that you've made changes.
*/
#ifndef __SNAPSHOT__
#define __SNAPSHOT__
//#includes...
#ifdef __APPLE_CC__
#include <Carbon/Carbon.h>
#include <QuickTime/Movies.h>
#else
#include <Carbon.h>
#include <Movies.h>
#endif
/* Constant Declarations */
#define MENU_BAR_ID 128
#define MENU_BAR_IDX 129
#define ABOUT 1
#define ABOUTDLG 128
enum {
ABOUT_MENU = 128,
FILE_MENU,
FILE_MENUX,
SIZE_MENU,
SPECIAL_MENU,
SPECIAL_MENUX
};
//Note this constant does not include the "Quit" item
#define NUMBER_OF_FILE_MENU_ITEMS 4
enum {
FILE_NEW = 1,
FILE_REFRESH,
FILE_CLOSE,
FILE_SAVE,
FILE_QUIT
};
#define NUMBER_OF_SIZES 3
enum {
SIZE_QUARTER_SCALE = 1,
SIZE_HALF_SCALE,
SIZE_FULL_SCALE
};
#define NUMBER_OF_SPECIALS 1
enum {
SPECIAL_CONFUSING = 1
};
// Prototypes
void initMac();
void destroyAllWindows();
void setUp();
Boolean onOSX();
void handleMenuSelection(long result);
void handleKeyPress(EventRecord *);
void saveToPICTFile();
WindowPtr createWindow();
void resizeWindow(WindowPtr theWindow);
void doDynamicResizing(WindowPtr theWindow);
void doConfusion();
void disposeWindow(WindowPtr);
void writePictToFile(FSSpec *fspec, PicHandle picHandle);
OSErr SetDesktopPict(AEDesc* pAEDesc,SInt32 pIndex);
OSErr MakePictureProperty(SInt32 pIndex, AEDesc* containerObjPtr, AEDesc* propertyObjPtr);
void calculateSystemBounds();
PixMapHandle createScreenPixMap();
void drawImage(WindowPtr);
void doNewSnapshot();
void adjustMenus();
pascal OSErr AEQuitHandler(const AppleEvent *messagein, AppleEvent *reply, long refIn);
void doEventLoop();
void doTrickEventLoop();
void processEvent(EventRecord *anEvent);
OSErr LaunchProcessBySignature(const OSType pTargetType,const OSType pTargetCreator,ProcessSerialNumberPtr psnPtr);
OSErr Find_DTDB_APPL(const OSType pTargetCreator,FSSpec* pFSSpecPtr);
OSErr Search_Volumes(const OSType pTargetType,const OSType pTargetCreator,FSSpec* pFSSpecPtr);
OSErr Search_Volume(const SInt16 pVRefNum,const OSType pTargetType,const OSType pTargetCreator,FSSpec* pFSSpecPtr);
pascal OSErr AEHMakeEventSignatureTarget( const OSType targetType,
const OSType targetCreator,
const AEEventClass eventClass,
const AEEventID eventID,
AppleEvent *theEventPtr );
pascal OSErr AEHSendEventNoReturnValue( const AEIdleUPP idleProcUPP,
const AppleEvent *theEvent );
pascal OSErr AEHMakeEventProcessTarget( const ProcessSerialNumberPtr psnPtr,
const AEEventClass eventClass,
const AEEventID eventID,
AppleEvent *theEventPtr );
pascal OSErr AEHGetHandlerError( const AppleEvent *reply );
pascal OSErr FindProcessBySignature( const OSType targetType,
const OSType targetCreator,
ProcessSerialNumberPtr psnPtr );
pascal OSErr OHMakeAliasDescFromFSSpec( const FSSpecPtr fssPtr,
AEDesc *aliasDescPtr );
pascal OSErr OHMakeAliasDesc( const AliasHandle aliasHandle,
AEDesc *aliasDescPtr );
#endif</pre>
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