cfwrappers.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
 *      
 * The contents of this file, and the files included with this file, are 
 * subject to the current version of the RealNetworks Public Source License 
 * Version 1.0 (the "RPSL") available at 
 * http://www.helixcommunity.org/content/rpsl unless you have licensed 
 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
 * directly from RealNetworks.  You may not use this file except in 
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 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
 * RCSL for the rights, obligations and limitations governing use of the 
 * contents of the file.  
 *  
 * This file is part of the Helix DNA Technology. RealNetworks is the 
 * developer of the Original Code and owns the copyrights in the portions 
 * it created. 
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 * This file, and the files included with this file, is distributed and made 
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 * ***** END LICENSE BLOCK ***** */ 

//
// Core Foundation wrappers
//
// These wrappers primarily exist to ensure that the types get disposed
//
// They can in most instances be dropped directly into Core Foundation
// toolbox calls.  Because of that, they have few methods themselves.
//
// BIG WARNING: These will RELEASE the native CF object of the same type
// assigned to them. So don't assign a CFString to a CHXCFString or
// a CFURL to a CHXCFURL unless it should be released
// when the wrapper object is disposed.
//
// This means that a CFObject returned by a "..Copy.." CF routine can
// be assigned to these wrappers, but a CFObject returned by a "..Get.."
// CF routine should NOT be assigned to these (unleass an extra CFRetain
// is called on the object.)
//
// A additional retain is done when assigning CHXCFString to a CHXCFString
// or a CHXCFURL to a CHXCFURL since both objects will release the
// underlying ref on destruction.

#pragma once

#ifndef _CARBON
#ifndef _MAC_UNIX
#error Carbon-only header
#endif
#endif

#ifndef _MAC_MACHO
#include <CFString.h>
#endif

#include "hxstring.h"	
#include "hxtypes.h"

class	CHXCFString 
{
public:
	CHXCFString(void);
	CHXCFString(CFStringRef cfs); // doesn't do an additional retain
	CHXCFString(const CHXCFString& cfs); // does do an additional retain
	CHXCFString(const CHXString &str); // makes an immutable string
	CHXCFString(const char *pCString); // makes an immutable string
	CHXCFString(const char *pCString, CFStringEncoding encoding); // makes an immutable string
	CHXCFString(ConstStr255Param pPString);
        CHXCFString(const UInt16* pUniChars, INT32 numChars);
	CHXCFString(CFURLRef urlRef);
	CHXCFString(const HFSUniStr255& hfsUni);
	~CHXCFString();

	operator CFStringRef() const { return mCFStringRef; }
	operator HFSUniStr255() const;
	Boolean IsSet() const { return (mCFStringRef != NULL); }

	const CHXCFString& operator =(CFStringRef cfs);  // NB: just frees the old one and copies the ref, doesn't do an additional retain
	const CHXCFString& operator =(const CHXCFString& cfs); // this one does add a retain to the string

	const CHXCFString& operator =(const char *pString);
	const CHXCFString& operator =(const CHXString& str);
	const CHXCFString& operator =(CFURLRef urlRef);
	const CHXCFString& operator =(const HFSUniStr255& hfsUni);

private:
	// There is no (const char *) operator defined for return strings since
	// we don't want to manage memory with this little wrapper class; assign 
	// to a CHXString instead
	
	CFStringRef		mCFStringRef;
	
	inline void ReleaseCFString();
	void SetToCFURL(CFURLRef cfURL);
	
	#ifdef _DEBUG
		// these enable us to see the internals of the CFString during debugging
		void UpdateDebugOnlyString(void);
		const char *pStrDebugOnlyPeek;
		CHXString mStrDebugOnly;
	#else
		inline void UpdateDebugOnlyString(void) {};
	#endif

};


class	CHXCFURL 
{
public:
	CHXCFURL(void);
	CHXCFURL(const char *pCString);
	CHXCFURL(const CHXString& str);
	CHXCFURL(const FSRef& fsRef);
	CHXCFURL(const FSRef* fsRef);
	CHXCFURL(CFURLRef urlRef);
	~CHXCFURL();

	operator CFURLRef() const { return mCFURLRef; }
	Boolean IsSet() const { return (mCFURLRef != NULL); }

	const CHXCFURL& operator =(CFURLRef cfs);  // NB: just copies the ref, doesn't do an additional retain
	const CHXCFURL& operator =(const CHXCFURL& cfs); // does do an additional retain
	
	const CHXCFURL& operator =(const CHXString& str);
	const CHXCFURL& operator =(const char *pString);
	const CHXCFURL& operator =(const FSRef& fsRef);
	const CHXCFURL& operator =(const FSRef* fsRef);
	
private:
	CFURLRef		mCFURLRef;
	
	void SetToString(const char *pCString);
	void SetToFSRef(const FSRef& fsRef);
	inline void ReleaseCFURL();

	#ifdef _DEBUG
		// these enable us to see the internals of the CFURL during debugging
		void UpdateDebugOnlyString();
		const char *pStrDebugOnlyPeek;
		CHXString mStrDebugOnly;
	#else
		inline void UpdateDebugOnlyString() {};
	#endif
};