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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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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/UserExperience/index.html">User Experience</a> > <a href="../../samplecode/UserExperience/idxPorting-date.html">Porting</a> > <A HREF="javascript:location.replace('index.html');">Carbon Porting Tutorial</A> >
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<h2>/6_HIToolbox/IconDBUtilities.c</h2>
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<p><strong>View Source Code:</strong>
<select name="gotop" onChange="JumpToNewPage();" style="width:340px"><option selected value="ingnore">Select File</option>
<option value="listing1.html">/0_ Tutorial Start Here.html</option>
<option value="listing2.html">/0_Tutorial/Carbon Events.html</option>
<option value="listing3.html">/0_Tutorial/Classic.html</option>
<option value="listing4.html">/0_Tutorial/Conclusion.html</option>
<option value="listing5.html">/0_Tutorial/Data Browser.html</option>
<option value="listing6.html">/0_Tutorial/First Carbon.html</option>
<option value="listing7.html">/0_Tutorial/HIToolbox.html</option>
<option value="listing8.html">/0_Tutorial/Mach-O.html</option>
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<option value="listing10.html">/0_Tutorial/Universal Binary.html</option>
<option value="listing11.html">/1_Classic/ExamplePrefs.c</option>
<option value="listing12.html">/1_Classic/ExamplePrefs.h</option>
<option value="listing13.html">/1_Classic/ExamplePrefs.r</option>
<option value="listing14.html">/1_Classic/Help.c</option>
<option value="listing15.html">/1_Classic/Help.h</option>
<option value="listing16.html">/1_Classic/Help.r</option>
<option value="listing17.html">/1_Classic/IconListDef/IconListDef.c</option>
<option value="listing18.html">/1_Classic/IconListDef/IconListDef.h</option>
<option value="listing19.html">/1_Classic/IconListDef/Prefix.h</option>
<option value="listing20.html">/1_Classic/IconListUtilities.c</option>
<option value="listing21.html">/1_Classic/IconListUtilities.h</option>
<option value="listing22.html">/1_Classic/Includes.txt</option>
<option value="listing23.html">/1_Classic/MissingConstants.h</option>
<option value="listing24.html">/1_Classic/MissingConstants.r</option>
<option value="listing25.html">/1_Classic/Prefix.h</option>
<option value="listing26.html">/1_Classic/PrefsDialog.c</option>
<option value="listing27.html">/1_Classic/PrefsDialog.h</option>
<option value="listing28.html">/1_Classic/PrefsDialog.r</option>
<option value="listing29.html">/1_Classic/PrefsWindow.c</option>
<option value="listing30.html">/1_Classic/PrefsWindow.h</option>
<option value="listing31.html">/1_Classic/PrefsWindow.r</option>
<option value="listing32.html">/1_Classic/ReadMe.txt</option>
<option value="listing33.html">/2_First_Carbon/CarbonPrefix.h</option>
<option value="listing34.html">/2_First_Carbon/ClassicIncludes.txt</option>
<option value="listing35.html">/2_First_Carbon/ClassicPrefix.h</option>
<option value="listing36.html">/2_First_Carbon/ExamplePrefs.c</option>
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<option value="listing38.html">/2_First_Carbon/ExamplePrefs.r</option>
<option value="listing39.html">/2_First_Carbon/Help.c</option>
<option value="listing40.html">/2_First_Carbon/Help.h</option>
<option value="listing41.html">/2_First_Carbon/Help.r</option>
<option value="listing42.html">/2_First_Carbon/IconListDef/IconListDef.c</option>
<option value="listing43.html">/2_First_Carbon/IconListDef/IconListDef.h</option>
<option value="listing44.html">/2_First_Carbon/IconListDef/Prefix.h</option>
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<option value="listing51.html">/2_First_Carbon/PrefsDialog.r</option>
<option value="listing52.html">/2_First_Carbon/PrefsWindow.c</option>
<option value="listing53.html">/2_First_Carbon/PrefsWindow.h</option>
<option value="listing54.html">/2_First_Carbon/PrefsWindow.r</option>
<option value="listing55.html">/2_First_Carbon/ReadMe.txt</option>
<option value="listing56.html">/3_Carbon_Events/CarbonPrefix.h</option>
<option value="listing57.html">/3_Carbon_Events/ClassicIncludes.txt</option>
<option value="listing58.html">/3_Carbon_Events/ClassicPrefix.h</option>
<option value="listing59.html">/3_Carbon_Events/ExamplePrefs.c</option>
<option value="listing60.html">/3_Carbon_Events/ExamplePrefs.h</option>
<option value="listing61.html">/3_Carbon_Events/ExamplePrefs.r</option>
<option value="listing62.html">/3_Carbon_Events/Help.c</option>
<option value="listing63.html">/3_Carbon_Events/Help.h</option>
<option value="listing64.html">/3_Carbon_Events/Help.r</option>
<option value="listing65.html">/3_Carbon_Events/IconListDef/IconListDef.c</option>
<option value="listing66.html">/3_Carbon_Events/IconListDef/IconListDef.h</option>
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<option value="listing71.html">/3_Carbon_Events/MissingConstants.r</option>
<option value="listing72.html">/3_Carbon_Events/PrefsDialog.c</option>
<option value="listing73.html">/3_Carbon_Events/PrefsDialog.h</option>
<option value="listing74.html">/3_Carbon_Events/PrefsDialog.r</option>
<option value="listing75.html">/3_Carbon_Events/PrefsWindow.c</option>
<option value="listing76.html">/3_Carbon_Events/PrefsWindow.h</option>
<option value="listing77.html">/3_Carbon_Events/PrefsWindow.r</option>
<option value="listing78.html">/3_Carbon_Events/ReadMe.txt</option>
<option value="listing79.html">/4_Mach-O/ExamplePrefs.c</option>
<option value="listing80.html">/4_Mach-O/ExamplePrefs.h</option>
<option value="listing81.html">/4_Mach-O/ExamplePrefs.r</option>
<option value="listing82.html">/4_Mach-O/Help.c</option>
<option value="listing83.html">/4_Mach-O/Help.h</option>
<option value="listing84.html">/4_Mach-O/Help.r</option>
<option value="listing85.html">/4_Mach-O/IconListDef.c</option>
<option value="listing86.html">/4_Mach-O/IconListDef.h</option>
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<option value="listing88.html">/4_Mach-O/IconListUtilities.h</option>
<option value="listing89.html">/4_Mach-O/Mach-OPrefix.h</option>
<option value="listing90.html">/4_Mach-O/MissingConstants.h</option>
<option value="listing91.html">/4_Mach-O/MissingConstants.r</option>
<option value="listing92.html">/4_Mach-O/PEFPrefix.h</option>
<option value="listing93.html">/4_Mach-O/PrefsDialog.c</option>
<option value="listing94.html">/4_Mach-O/PrefsDialog.h</option>
<option value="listing95.html">/4_Mach-O/PrefsDialog.r</option>
<option value="listing96.html">/4_Mach-O/PrefsWindow.c</option>
<option value="listing97.html">/4_Mach-O/PrefsWindow.h</option>
<option value="listing98.html">/4_Mach-O/PrefsWindow.r</option>
<option value="listing99.html">/5_Data_Browser/English.lproj/ExamplePrefs.r</option>
<option value="listing100.html">/5_Data_Browser/English.lproj/PrefsDialog.r</option>
<option value="listing101.html">/5_Data_Browser/English.lproj/PrefsWindow.r</option>
<option value="listing102.html">/5_Data_Browser/ExamplePrefs.c</option>
<option value="listing103.html">/5_Data_Browser/ExamplePrefs.h</option>
<option value="listing104.html">/5_Data_Browser/Help.c</option>
<option value="listing105.html">/5_Data_Browser/Help.h</option>
<option value="listing106.html">/5_Data_Browser/IconDBCallbacks.c</option>
<option value="listing107.html">/5_Data_Browser/IconDBCallbacks.h</option>
<option value="listing108.html">/5_Data_Browser/IconDBUtilities.c</option>
<option value="listing109.html">/5_Data_Browser/IconDBUtilities.h</option>
<option value="listing110.html">/5_Data_Browser/Mach-OPrefix.h</option>
<option value="listing111.html">/5_Data_Browser/MissingConstants.r</option>
<option value="listing112.html">/5_Data_Browser/PEFPrefix.h</option>
<option value="listing113.html">/5_Data_Browser/PrefsDialog.c</option>
<option value="listing114.html">/5_Data_Browser/PrefsDialog.h</option>
<option value="listing115.html">/5_Data_Browser/PrefsWindow.c</option>
<option value="listing116.html">/5_Data_Browser/PrefsWindow.h</option>
<option value="listing117.html">/6_HIToolbox/ExamplePrefs.c</option>
<option value="listing118.html">/6_HIToolbox/ExamplePrefs.h</option>
<option value="listing119.html">/6_HIToolbox/ExamplePrefs.r</option>
<option value="listing120.html">/6_HIToolbox/Help.c</option>
<option value="listing121.html">/6_HIToolbox/Help.h</option>
<option value="listing122.html">/6_HIToolbox/IconDBCallbacks.c</option>
<option value="listing123.html">/6_HIToolbox/IconDBCallbacks.h</option>
<option value="listing124.html">/6_HIToolbox/IconDBUtilities.c</option>
<option value="listing125.html">/6_HIToolbox/IconDBUtilities.h</option>
<option value="listing126.html">/6_HIToolbox/Mach-OPrefix.h</option>
<option value="listing127.html">/6_HIToolbox/MissingConstants.r</option>
<option value="listing128.html">/6_HIToolbox/PEFPrefix.h</option>
<option value="listing129.html">/6_HIToolbox/PrefsDialog.c</option>
<option value="listing130.html">/6_HIToolbox/PrefsDialog.h</option>
<option value="listing131.html">/6_HIToolbox/PrefsDialog.r</option>
<option value="listing132.html">/6_HIToolbox/PrefsWindow.c</option>
<option value="listing133.html">/6_HIToolbox/PrefsWindow.h</option>
<option value="listing134.html">/6_HIToolbox/PrefsWindow.r</option>
<option value="listing135.html">/7_Universal_Binary/ExamplePrefs.c</option>
<option value="listing136.html">/7_Universal_Binary/ExamplePrefs.h</option>
<option value="listing137.html">/7_Universal_Binary/IconDBCallbacks.c</option>
<option value="listing138.html">/7_Universal_Binary/IconDBCallbacks.h</option>
<option value="listing139.html">/7_Universal_Binary/IconDBUtilities.c</option>
<option value="listing140.html">/7_Universal_Binary/IconDBUtilities.h</option>
<option value="listing141.html">/7_Universal_Binary/Prefix.h</option>
<option value="listing142.html">/7_Universal_Binary/PrefsDialog.c</option>
<option value="listing143.html">/7_Universal_Binary/PrefsDialog.h</option>
<option value="listing144.html">/7_Universal_Binary/PrefsWindow.c</option>
<option value="listing145.html">/7_Universal_Binary/PrefsWindow.h</option></select>
</p>
</form>
<p><strong><a href="CarbonPorting.zip">Download Sample</a></strong> (“CarbonPorting.zip”, 2.20M)<BR>
<strong><a href="CarbonPorting.dmg">Download Sample</a></strong> (“CarbonPorting.dmg”, 2.47M)</p>
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<!--googleon: index -->
<pre class="sourcecodebox">/*File: IconDBUtilities.cAbstract: Handles creating the Icon Data Browser and adding and removing data from it.Version: 6.0Change History: <6.0> made addItemsToIconDB a public function, changed the name to SetupIconDataBrowser, and moved a few lines from CreateIconDataBrowser into it CreateIconDataBrowser is now only in the PEF version <5.0> changed this file's name from IconListUtilities.c to IconDBUtilities.c converted everything from a List Manager list interface to a Data Browser control interface added CreateIconDataBrowser made AddRowsAndDataToIconList an internal function, changed the name to addItemsToIconDB, and converted from 'icns' and 'STR#' resources to .icns and .strings files renamed ClearIconsAreRegistered to InitIconDataBrowser renamed ReleaseIconListIcons to ReleaseIconDataBrowserItemData which releases the icon label CFStrings as well as the icons removed getCurrentResourceFSSpec <4.0> removed all Classic code <3.0> no changes necessary <2.0> changed ReleaseListIcons to make sure the icons get released when they are unregistered (see the comment in the function for discussion) <1.0> first release version though we're not using them, Mac OS 8.6 introduces packages; we made getCurrentResourceFSSpec to allow for the possibility that our main application file might not contain the 'icns' resources at some point in the future© Copyright 2005 Apple Computer, Inc. All rights reserved.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.*/#include "ExamplePrefs.h"#include "IconDBCallbacks.h"#include "IconDBUtilities.h"enum{ kCategoryProperty = 'Cgry'};static Boolean gIconsRegistered;static DataBrowserCallbacks gIconDBCallbacks;static DataBrowserCustomCallbacks gIconDBCustomCallbacks;static int gCallbackRefCount;// --------------------------------------------------------------------------------------void InitIconDataBrowser(void){ gIconsRegistered = false; gIconDBCallbacks.version = kDataBrowserLatestCallbacks; InitDataBrowserCallbacks(&gIconDBCallbacks); gIconDBCustomCallbacks.version = kDataBrowserLatestCustomCallbacks; InitDataBrowserCustomCallbacks(&gIconDBCustomCallbacks); gCallbackRefCount = 0;}#if !TARGET_API_MAC_OSX// --------------------------------------------------------------------------------------ControlRef CreateIconDataBrowser(WindowRef window, const Rect *dbRect){ ControlRef dataBrowserControl; DataBrowserListViewColumnDesc columnDesc; CreateDataBrowserControl(window, dbRect, kDataBrowserListView, &dataBrowserControl); SetDataBrowserHasScrollBars(dataBrowserControl, false, true); SetDataBrowserSelectionFlags(dataBrowserControl, kDataBrowserDragSelect | kDataBrowserSelectOnlyOne); SetDataBrowserListViewHeaderBtnHeight(dataBrowserControl, 0); // no header button SetDataBrowserTableViewHiliteStyle(dataBrowserControl, kDataBrowserTableViewFillHilite); // because kDataBrowserTableViewMinimalHilite would require us to provide a hit test // callback which we would just return true from anyways columnDesc.propertyDesc.propertyID = kCategoryProperty; columnDesc.propertyDesc.propertyType = kDataBrowserCustomType; // because // kDataBrowserIconAndTextType doesn't draw the way we want columnDesc.propertyDesc.propertyFlags = kDataBrowserDefaultPropertyFlags | kDataBrowserListViewSelectionColumn; columnDesc.headerBtnDesc.version = kDataBrowserListViewLatestHeaderDesc; columnDesc.headerBtnDesc.minimumWidth = kColumnWidth; columnDesc.headerBtnDesc.maximumWidth = kColumnWidth; columnDesc.headerBtnDesc.titleOffset = 0; columnDesc.headerBtnDesc.titleString = NULL; columnDesc.headerBtnDesc.initialOrder = kDataBrowserOrderIncreasing; columnDesc.headerBtnDesc.btnFontStyle.flags = 0; columnDesc.headerBtnDesc.btnContentInfo.contentType = kControlNoContent; AddDataBrowserListViewColumn(dataBrowserControl, &columnDesc, kDataBrowserListViewAppendColumn); return dataBrowserControl;}#endif// --------------------------------------------------------------------------------------void SetupIconDataBrowser(ControlRef iconDataBrowser, ControlRef *userPanes){ IconDBItemDataRec *itemsData, *rowItemData; CFBundleRef mainBundle; CFIndex rowNumber; DataBrowserItemID items[kNumberOfRows]; CFStringRef catNameKeys[kNumberOfRows]; /* AddDataBrowserListViewColumn will resize the row height it seems. We call that ourselves in CreateIconDataBrowser, and apparently when a data browser control with at least one column is created from a nib it gets called as well. Therefore we need to set the row height here after everyone has finished adding columns. */#if TARGET_API_MAC_OSX SetDataBrowserTableViewRowHeight(iconDataBrowser, kRowHeight);#else // Mac OS 8/9 under CarbonLib adds 1 to the row height you provide SetDataBrowserTableViewRowHeight(iconDataBrowser, kRowHeight - 1);#endif SetDataBrowserListViewUsePlainBackground(iconDataBrowser, true); if (gCallbackRefCount == 0) {#if !TARGET_API_MAC_OSX gIconDBCallbacks.u.v1.itemNotificationCallback = NewDataBrowserItemNotificationUPP(IconDataBrowserItemSelectionCB); gIconDBCustomCallbacks.u.v1.drawItemCallback = NewDataBrowserDrawItemUPP(DrawIconDataBrowserItem86CB);#else if (MacOSVersion() >= 0x1040) { gIconDBCallbacks.u.v1.itemNotificationCallback = NewDataBrowserItemNotificationUPP(IconDataBrowserItemSelectionCompCB); gIconDBCustomCallbacks.u.v1.drawItemCallback = NewDataBrowserDrawItemUPP(DrawIconDataBrowserItem104CB); } else if (MacOSVersion() >= 0x1030) { gIconDBCallbacks.u.v1.itemNotificationCallback = NewDataBrowserItemNotificationUPP(IconDataBrowserItemSelectionCompCB); gIconDBCustomCallbacks.u.v1.drawItemCallback = NewDataBrowserDrawItemUPP(DrawIconDataBrowserItem103CB); } else if (MacOSVersion() >= 0x1010) { gIconDBCallbacks.u.v1.itemNotificationCallback = NewDataBrowserItemNotificationUPP(IconDataBrowserItemSelectionCB); gIconDBCustomCallbacks.u.v1.drawItemCallback = NewDataBrowserDrawItemUPP(DrawIconDataBrowserItem101CB); } else { gIconDBCallbacks.u.v1.itemNotificationCallback = NewDataBrowserItemNotificationUPP(IconDataBrowserItemSelectionCB); gIconDBCustomCallbacks.u.v1.drawItemCallback = NewDataBrowserDrawItemUPP(DrawIconDataBrowserItem86CB); }#endif } SetDataBrowserCallbacks(iconDataBrowser, &gIconDBCallbacks); SetDataBrowserCustomCallbacks(iconDataBrowser, &gIconDBCustomCallbacks); gCallbackRefCount++; itemsData = CFAllocatorAllocate(kCFAllocatorDefault, kNumberOfRows * sizeof(IconDBItemDataRec), 0); mainBundle = CFBundleGetMainBundle(); if (!gIconsRegistered) // if we didn't register our icons already, we need to { CFArrayRef iconURLs; FSRef iconFile; FSSpec iconSpec; iconURLs = CFBundleCopyResourceURLsOfType(mainBundle, CFSTR("icns"), CFSTR("PrefCategories")); for (rowNumber = 0; rowNumber < kNumberOfRows; rowNumber++) { CFURLGetFSRef(CFArrayGetValueAtIndex(iconURLs, rowNumber), &iconFile);#if TARGET_API_MAC_OSX#pragma unused (iconSpec) RegisterIconRefFromFSRef(kAppSignature, 'Cat0' + rowNumber, &iconFile, &((itemsData + rowNumber)->icon));#else FSGetCatalogInfo(&iconFile, kFSCatInfoNone, NULL, NULL, &iconSpec, NULL); RegisterIconRefFromIconFile(kAppSignature, 'Cat0' + rowNumber, &iconSpec, &((itemsData + rowNumber)->icon));#endif } CFRelease(iconURLs); gIconsRegistered = true; } else // the icons are already registered so we just have to get them { for (rowNumber = 0; rowNumber < kNumberOfRows; rowNumber++) { GetIconRef(kOnSystemDisk, kAppSignature, 'Cat0' + rowNumber, &((itemsData + rowNumber)->icon)); } } catNameKeys[0] = CFSTR("Panel 1"); // this is necessary because you have to use catNameKeys[1] = CFSTR("Panel 2"); // constant strings with CFSTR catNameKeys[2] = CFSTR("Panel 3"); // if we didn't do this then we couldn't get catNameKeys[3] = CFSTR("Panel 4"); // the strings in a loop catNameKeys[4] = CFSTR("Panel 5"); catNameKeys[5] = CFSTR("Panel 6"); catNameKeys[6] = CFSTR("Panel 7"); catNameKeys[7] = CFSTR("Panel 8"); catNameKeys[8] = CFSTR("Panel 9"); catNameKeys[9] = CFSTR("Panel 10"); for (rowNumber = 0; rowNumber < kNumberOfRows; rowNumber++) // now get the names { // and set the user panes rowItemData = itemsData + rowNumber; items[rowNumber] = (DataBrowserItemID)rowItemData; /* We use CFCopyLocalilzedStringFromTableInBundle here instead of CFCopyLocalizedString to avoid a call to CFBundleGetMainBundle every trip around the loop. */ rowItemData->name = CFCopyLocalizedStringFromTableInBundle(catNameKeys[rowNumber], NULL, mainBundle, NULL); rowItemData->userPane = *(userPanes + rowNumber); } AddDataBrowserItems(iconDataBrowser, kDataBrowserNoItem, kNumberOfRows, items, kDataBrowserItemNoProperty); SetDataBrowserSelectedItems(iconDataBrowser, 1, items, kDataBrowserItemsAssign);} // SetupIconDataBrowser// --------------------------------------------------------------------------------------void ReleaseIconDataBrowserItemData(ControlRef iconDataBrowser){ Handle itemsHandle; DataBrowserItemID *items; int itemNumber; IconDBItemDataRec *itemsData[kNumberOfRows]; UInt16 referenceCount; Boolean needRelease = false; itemsHandle = NewHandle(0); // GetDataBrowserItems will resize this for us GetDataBrowserItems(iconDataBrowser, kDataBrowserNoItem, false, kDataBrowserItemAnyState, itemsHandle); /* At this point we have the following: Handle -> Pointer -> DataBrowserItemID[] In our icon data browser, DataBrowserItemID = IconDBItemDataRec pointer So that means we have: Handle -> Pointer -> IconDBItemDataRec pointer -> IconDBItemDataRec */ HLockHi(itemsHandle); // since we're about to dereference this, we need it to stay put items = (DataBrowserItemID *)*itemsHandle; /* While this is technically unnecessary, it will save us a lot of awkward multiple dereferencings and generally make things much easier to read. */ for (itemNumber = 0; itemNumber < kNumberOfRows; itemNumber++) itemsData[itemNumber] = (IconDBItemDataRec *)*(items + itemNumber); GetIconRefOwners((itemsData[0])->icon, &referenceCount); // first, unregister and/or release the icons if (referenceCount == 1) // if this is the last instance of the { // IconRefs we should unregister them OSType iconType; /* UnregisterIconRef doesn't decrement the reference count on some versions of Mac OS X (it does on 10.1.5, doesn't on 10.2.8, and does on 10.3.4). To account for this we will retain/acquire the icon, unregister it, then check the reference/owner count. If it's the same then we will also release the icons. We can't release the icons first or UnregisterIconRef will return noSuchIconErr (because the icons will already be disposed). Likewise we can't just release the icons afterwards because they may get disposed of when they're unregistered. */ AcquireIconRef((itemsData[0])->icon); for (iconType = 'Cat0'; iconType <= 'Cat9'; iconType++) UnregisterIconRef(kAppSignature, iconType); gIconsRegistered = false; GetIconRefOwners((itemsData[0])->icon, &referenceCount); if (referenceCount > 1) needRelease = true; ReleaseIconRef((itemsData[0])->icon); } else // otherwise simply release the icons needRelease = true; if (needRelease) { for (itemNumber = 0; itemNumber < kNumberOfRows; itemNumber++) ReleaseIconRef((itemsData[itemNumber])->icon); } // second, release the strings for (itemNumber = 0; itemNumber < kNumberOfRows; itemNumber++) CFRelease((itemsData[itemNumber])->name); DisposeHandle(itemsHandle); // finally, release our callbacks gCallbackRefCount--; if (gCallbackRefCount == 0) { DisposeDataBrowserItemNotificationUPP(gIconDBCallbacks.u.v1.itemNotificationCallback); DisposeDataBrowserDrawItemUPP(gIconDBCustomCallbacks.u.v1.drawItemCallback); }}</pre>
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