自学教程：C++ FreeData函数代码示例

/*========================idSoundSample_XAudio2::MakeDefault========================*/void idSoundSample_XAudio2::MakeDefault(){	FreeData();		static const int DEFAULT_NUM_SAMPLES = 256;		timestamp = FILE_NOT_FOUND_TIMESTAMP;	loaded = true;		memset( &format, 0, sizeof( format ) );	format.basic.formatTag = idWaveFile::FORMAT_PCM;	format.basic.numChannels = 1;	format.basic.bitsPerSample = 16;	format.basic.samplesPerSec = XAUDIO2_MIN_SAMPLE_RATE;	format.basic.blockSize = format.basic.numChannels * format.basic.bitsPerSample / 8;	format.basic.avgBytesPerSec = format.basic.samplesPerSec * format.basic.blockSize;		assert( format.basic.blockSize == 2 );		totalBufferSize = DEFAULT_NUM_SAMPLES * 2;		short* defaultBuffer = ( short* )AllocBuffer( totalBufferSize, GetName() );	for( int i = 0; i < DEFAULT_NUM_SAMPLES; i += 2 )	{		defaultBuffer[i + 0] = SHRT_MIN;		defaultBuffer[i + 1] = SHRT_MAX;	}		buffers.SetNum( 1 );	buffers[0].buffer = defaultBuffer;	buffers[0].bufferSize = totalBufferSize;	buffers[0].numSamples = DEFAULT_NUM_SAMPLES;	buffers[0].buffer = GPU_CONVERT_CPU_TO_CPU_CACHED_READONLY_ADDRESS( buffers[0].buffer );		playBegin = 0;	playLength = DEFAULT_NUM_SAMPLES;}

void emDirEntry::Clear(){	if (!--Data->RefCount) FreeData();	Data=&EmptyData;}

SplineData::~SplineData(){	FreeData();}

 ~MMDeviceAudioSource() {     StopCapture();     FreeData();     SafeRelease(mmEnumerator); }

Player::~Player(){	FreeData();}

/*================idProgram::~idProgram================*/idProgram::~idProgram(){	FreeData();}

	void AllocData()	{		FreeData();		m_pKVData = new KeyValues( "gamestats" );	}

Program::~Program(){    FreeData();}

DataNode::~DataNode(){    FreeData();}

void InitEns (enkf_struct ens){    int             ne;    pihm_struct     pihm;    N_Vector        CV_Y;       /* State Variables Vector */    int             nsv;    int             i, j;    char            outputdir[MAXSTRING];    outputdir[0] = '/0';    pihm = (pihm_struct)malloc (sizeof *pihm);    ReadAlloc (project, pihm);    /* problem size */    nsv = 3 * pihm->numele + 2 * pihm->numriv;    CV_Y = N_VNew_Serial (nsv);    Initialize (pihm, CV_Y);    MapOutput (project, pihm, outputdir);    ens->numele = pihm->numele;    ens->numriv = pihm->numriv;    ens->ascii = pihm->ctrl.ascii;    /* Initialize ensemble members */    ne = ens->ne;    ens->member = (ensmbr_struct *) malloc (ne * sizeof (ensmbr_struct));    /*     * Define variable controls: vairable names, variable dimension, etc.     */    MapVar (ens->var, ens->numele, ens->numriv);    InitOper (pihm, ens);    printf("Ensemble members: %d/n", ne);    printf("Default observation cycle: %-d hour(s)/n", ens->interval /  3600);    printf("Observations:");    if (ens->nobs == 0)    {        printf(" none");    }    else    {        for (i = 0; i < ens->nobs - 1; i++)        {            printf(" %s,", ens->obs[i].name);        }        printf(" %s/n", ens->obs[ens->nobs - 1].name);    }    for (i = 0; i < ne; i++)    {        for (j = 0; j < MAXVAR; j++)        {            if (ens->var[j].dim > 0)            {                ens->member[i].var[j] =                    (double *) malloc (ens->var[j].dim * sizeof(double));            }        }    }    N_VDestroy_Serial (CV_Y);    FreeData (pihm);    free (pihm);}

// Like ReloadStrings, but clears all the strings before reloadingvoid FStringTable::ResetStrings (){	FreeData ();	LoadStrings (LumpNum, -1, false);}

otG711Encoder::~otG711Encoder(){    FreeData();}

/** * Loads elevation from a USGS DEM file. * * Some non-standard variations of the DEM format are supported. * * You should call SetupLocalCS() after loading if you will be doing * heightfield operations on this grid. * * /returns /c true if the file was successfully opened and read. */bool vtElevationGrid::LoadFromDEM(const char *szFileName,								  bool progress_callback(int), vtElevError *err){	// Free buffers to prepare to receive new data	FreeData();	if (progress_callback != NULL) progress_callback(0);	FILE *fp = vtFileOpen(szFileName,"rb");	if (!fp)		// Cannot Open File	{		SetError(err, vtElevError::FILE_OPEN, "Couldn't open file '%s'", szFileName);		return false;	}	// check for version of DEM format	int		iRow, iColumn;	char buffer[158];	fseek(fp, 864, 0);	if (fread(buffer, 144, 1, fp) != 1)	{		SetError(err, vtElevError::READ_DATA, "Couldn't read DEM data from '%s'", szFileName);		return false;	}	bool bOldFormat = (strncmp(buffer, "     1     1", 12) == 0);	bool bNewFormat = false;	bool bFixedLength = true;	int  iDataStartOffset = 1024;	// set here to avoid compiler warning	int  i, j;	if (bOldFormat)		iDataStartOffset = 1024;	// 1024 is record length	else	{		fseek(fp, 1024, 0);		// Check for New Format		IConvert(fp, 6, iRow);		IConvert(fp, 6, iColumn);		if (iRow==1 && iColumn==1)	// File OK?		{			bNewFormat = true;			iDataStartOffset = 1024;		}		else		{			// might be the Non-fixed-length record format			// Record B can start anywhere from 865 to 1023			// Record B is identified by starting with the row/column			//  of its first profile, "     1     1"			fseek(fp, 865, 0);			if (fread(buffer, 158, 1, fp) != 1)			{				SetError(err, vtElevError::READ_DATA, "Couldn't read DEM data from '%s'", szFileName);				fclose(fp);				return false;			}			for (i = 0; i < 158-12; i++)			{				if (!strncmp(buffer+i, "     1     1", 12))				{					// Found it					bFixedLength = false;					iDataStartOffset = 865+i;					break;				}			}			if (i == 158-12)			{				// Not a DEM file				SetError(err, vtElevError::READ_DATA, "Couldn't read DEM data from '%s'", szFileName);				fclose(fp);				return false;			}		}	}	// Read the embedded DEM name	char szName[41];	fseek(fp, 0, 0);	if (fgets(szName, 41, fp) == NULL)		return false;	int len = strlen(szName);	// trim trailing whitespace	while (len > 0 && szName[len-1] == ' ')	{		szName[len-1] = 0;		len--;	}	m_strOriginalDEMName = szName;	fseek(fp, 156, 0);//.........这里部分代码省略.........

emDirEntry::~emDirEntry(){	if (!--Data->RefCount) FreeData();}

void emDirEntry::PrivLoad(const emString & path, const emString & name){#if defined(_WIN32)	WIN32_FILE_ATTRIBUTE_DATA fad;	BOOL b;	if (!--Data->RefCount) FreeData();	Data=new SharedData;	Data->Path=path;	Data->Name=name;	Data->TargetPath=Data->Path;	if (em_stat(Data->Path,&Data->Stat)) {		Data->LStatErrNo=errno;		Data->StatErrNo=errno;		memset(&Data->Stat,0,sizeof(struct em_stat));	}	Data->Owner=emString::Format("%u",Data->Stat.st_uid);	Data->Group=emString::Format("%u",Data->Stat.st_gid);	b=GetFileAttributesEx(Data->Path.Get(),GetFileExInfoStandard,&fad);	Data->WndsFileAttributes = b ? fad.dwFileAttributes : 0;	Data->Hidden=(Data->WndsFileAttributes&FILE_ATTRIBUTE_HIDDEN)!=0;#else	char tmp[1024];#if !defined(ANDROID)	struct passwd pwbuf;	struct group grbuf;#endif	struct passwd * pw;	struct group * gr;	int i;	if (!--Data->RefCount) FreeData();	Data=new SharedData;	Data->Path=path;	Data->Name=name;	Data->TargetPath=Data->Path;	if (em_lstat(Data->Path,&Data->Stat)) {		Data->LStatErrNo=errno;		if (em_stat(Data->Path,&Data->Stat)) {			Data->StatErrNo=errno;			memset(&Data->Stat,0,sizeof(struct em_stat));		}		else {			Data->LStat=(struct em_stat*)malloc(sizeof(struct em_stat));			memset(Data->LStat,0,sizeof(struct em_stat));		}	}	else if (S_ISLNK(Data->Stat.st_mode)) {		Data->LStat=(struct em_stat*)malloc(sizeof(struct em_stat));		memcpy(Data->LStat,&Data->Stat,sizeof(struct em_stat));		if (em_stat(Data->Path,&Data->Stat)) {			Data->StatErrNo=errno;			memset(&Data->Stat,0,sizeof(struct em_stat));		}		i=readlink(Data->Path,tmp,sizeof(tmp)-1);		if (i<0) {			Data->TargetPathErrNo=errno;			tmp[0]=0;		}		else {			tmp[i]=0;		}		Data->TargetPath=tmp;	}#if defined(ANDROID)	pw=getpwuid(Data->Stat.st_uid);	i=0;#else	i=getpwuid_r(Data->Stat.st_uid,&pwbuf,tmp,sizeof(tmp),&pw);#endif	if (i==0 && pw && pw->pw_name) Data->Owner=pw->pw_name;	else Data->Owner=emString::Format("%lu",(unsigned long)Data->Stat.st_uid);#if defined(ANDROID)	gr=getgrgid(Data->Stat.st_gid);	i=0;#else	i=getgrgid_r(Data->Stat.st_gid,&grbuf,tmp,sizeof(tmp),&gr);#endif	if (i==0 && gr && gr->gr_name) Data->Group=gr->gr_name;	else Data->Group=emString::Format("%lu",(unsigned long)Data->Stat.st_gid);	Data->Hidden=(Data->Name[0]=='.');#endif}

/*========================idSoundSample_XAudio2::Load========================*/void idSoundSample_XAudio2::LoadResource() {	FreeData();	if ( idStr::Icmpn( GetName(), "_default", 8 ) == 0 ) {		MakeDefault();		return;	}	if ( s_noSound.GetBool() ) {		MakeDefault();		return;	}	loaded = false;	for ( int i = 0; i < 2; i++ ) {		idStrStatic< MAX_OSPATH > sampleName = GetName();		if ( ( i == 0 ) && !sampleName.Replace( "/vo/", va( "/vo/%s/", sys_lang.GetString() ) ) ) {			i++;		}		idStrStatic< MAX_OSPATH > generatedName = "generated/";		generatedName.Append( sampleName );		{			if ( s_useCompression.GetBool() ) {				sampleName.Append( ".msadpcm" );			} else {				sampleName.Append( ".wav" );			}			generatedName.Append( ".idwav" );		}		loaded = LoadGeneratedSample( generatedName ) || LoadWav( sampleName );		if ( !loaded && s_useCompression.GetBool() ) {			sampleName.SetFileExtension( "wav" );			loaded = LoadWav( sampleName );		}		if ( loaded ) {			if ( cvarSystem->GetCVarBool( "fs_buildresources" ) ) {				fileSystem->AddSamplePreload( GetName() );				WriteAllSamples( GetName() );				if ( sampleName.Find( "/vo/" ) >= 0 ) {					for ( int i = 0; i < Sys_NumLangs(); i++ ) {						const char * lang = Sys_Lang( i );						if ( idStr::Icmp( lang, ID_LANG_ENGLISH ) == 0 ) {							continue;						}						idStrStatic< MAX_OSPATH > locName = GetName();						locName.Replace( "/vo/", va( "/vo/%s/", Sys_Lang( i ) ) );						WriteAllSamples( locName );					}				}			}			return;		}	}	if ( !loaded ) {		// make it default if everything else fails		MakeDefault();	}	return;}

CTextureString::~CTextureString(){	FreeData();}

	~CGamestatsData()	{		FreeData();	}

// Discards temporary data.void Perspective::ReleaseIntermediate(){	FreeData();}

CTextureStringImage::~CTextureStringImage(){	FreeData();}

PokerData::~PokerData(){	FreeData(true); // Free data close database.	}

/*================idDeclAF::idDeclAF================*/idDeclAF::idDeclAF( void ) {	FreeData();}

CIrssMessage::~CIrssMessage(){    FreeData();}

MJsonValue::~MJsonValue(){	FreeData();}

FStringTable::~FStringTable (){	FreeData ();}

 ~ProfileNodeInfo() {     FreeData(); }

otSpeexDecoder::~otSpeexDecoder(){  FreeData();}