/*
File: DesktopPicture.m
Description: This file contains the SetDesktopPicture function, which tells the Finder to set a given picture as the desktop picture.
Author: MCF
Copyright: © Copyright 2002 Apple Computer, Inc. All rights reserved.
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Computer, Inc.
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Version History:
1.0 - 03/2002 Initial Release
*/
#import <Cocoa/Cocoa.h>
#include <Carbon/Carbon.h>
// Setting the desktop picture involves a lot of Apple Event and Carbon code.
// It's all self-contained in this one function. This Apple Event isn't guarrenteed to
// work forever, and real APIs to set the desktop picture should be coming down the road,
// but in the meantime this is how you do it.
OSErr SetDesktopPicture(NSString *picturePath,SInt32 pIndex)
{
AEDesc tAEDesc = {typeNull, nil}; // always init AEDescs
OSErr anErr = noErr;
AliasHandle aliasHandle=nil;
FSRef pictRef;
OSStatus status;
// Someday pIndex will hopefully determine on which monitor to set the desktop picture.
// This doesn't work in Mac OS X right now, so we don't do anything with the parameter.
#pragma unused (pIndex)
// Let's make an FSRef from the NSString picture path that was passed in
status=FSPathMakeRef([picturePath fileSystemRepresentation],&pictRef,NULL);
// Now we create an alias to the picture from that FSRef
if (status==noErr)
anErr = FSNewAlias( nil, &pictRef, &aliasHandle);
if ( noErr == anErr && aliasHandle == nil )
anErr = paramErr;
// Now we create an AEDesc containing the alias to the picture
if ( noErr == anErr )
{
char handleState = HGetState( (Handle) aliasHandle );
HLock( (Handle) aliasHandle);
anErr = AECreateDesc( typeAlias, *aliasHandle, GetHandleSize((Handle) aliasHandle), &tAEDesc);
HSetState( (Handle) aliasHandle, handleState );
DisposeHandle( (Handle)aliasHandle );
}
if (noErr == anErr)
{
// Now we need to build the actual Apple Event that we're going to send the Finder
AppleEvent tAppleEvent;
OSType sig = 'MACS'; // The app signature for the Finder
AEBuildError tAEBuildError;
anErr = AEBuildAppleEvent(kAECoreSuite,kAESetData,typeApplSignature,&sig,sizeof(OSType),
kAutoGenerateReturnID,kAnyTransactionID,&tAppleEvent,&tAEBuildError,
"'----':'obj '{want:type(prop),form:prop,seld:type('dpic'),from:'null'()},data:(@)",&tAEDesc);
// Finally we can go ahead and send the Apple Event using AESend
if (noErr == anErr)
{
AppleEvent theReply = {typeNull, nil};
anErr = AESend(&tAppleEvent,&theReply,kAENoReply,kAENormalPriority,kNoTimeOut,nil,nil);
AEDisposeDesc(&tAppleEvent); // Always dispose ASAP
}
}
return anErr;
}
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