oh_preferences_value.h

Overview

Provides APIs, enums, and structs for accessing the PreferencesValue object.

File to include: <database/preferences/oh_preferences_value.h>

Library: libohpreferences.so

System capability: SystemCapability.DistributedDataManager.Preferences.Core

Since: 13

Related module: Preferences

Summary

Structs

Name	typedef Keyword	Description
OH_PreferencesPair	OH_PreferencesPair	Defines a struct for the Preferences data in KV format.
OH_PreferencesValue	OH_PreferencesValue	Defines a struct for the PreferencesValue object.

Enums

Name	typedef Keyword	Description
Preference_ValueType	Preference_ValueType	Enumerates the data types of PreferencesValue.

Functions

Name	Description
const char *OH_PreferencesPair_GetKey(const OH_PreferencesPair *pairs, uint32_t index)	Obtains the key based on the specified index from the KV data.
const OH_PreferencesValue *OH_PreferencesPair_GetPreferencesValue(const OH_PreferencesPair *pairs, uint32_t index)	Obtains the value based on the specified index from the KV pairs.
Preference_ValueType OH_PreferencesValue_GetValueType(const OH_PreferencesValue *object)	Obtains the data type of an OH_PreferencesValue instance.
int OH_PreferencesValue_GetInt(const OH_PreferencesValue *object, int *value)	Obtains an integer from an OH_PreferencesValue instance.
int OH_PreferencesValue_GetBool(const OH_PreferencesValue *object, bool *value)	Obtains a Boolean value from an OH_PreferencesValue instance.
int OH_PreferencesValue_GetString(const OH_PreferencesValue *object, char **value, uint32_t *valueLen)	Obtains a string from an OH_PreferencesValue instance.
void OH_PreferencesPair_Destroy(OH_PreferencesPair *pairs, uint32_t count)	Destroys an OH_PreferencesPair instance.
OH_PreferencesValue* OH_PreferencesValue_Create(void)	Creates an OH_PreferencesValue instance.
void OH_PreferencesValue_Destroy(OH_PreferencesValue *value)	Destroys an OH_PreferencesValue instance.
int OH_PreferencesValue_SetInt(const OH_PreferencesValue *object, int value)	Sets an integer value for an OH_PreferencesValue instance.
int OH_PreferencesValue_SetBool(const OH_PreferencesValue *object, bool value)	Sets a boolean value for an OH_PreferencesValue instance.
int OH_PreferencesValue_SetString(const OH_PreferencesValue *object, const char *value)	Sets a string value for an OH_PreferencesValue instance.
int OH_PreferencesValue_SetInt64(const OH_PreferencesValue *object, int64_t value)	Sets an int64 value for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetInt64(const OH_PreferencesValue *object, int64_t *value)	Obtains an int64 value from an OH_PreferencesValue instance.
int OH_PreferencesValue_SetDouble(const OH_PreferencesValue *object, double value)	Sets a double value for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetDouble(const OH_PreferencesValue *object, double *value)	Obtains a double value from an OH_PreferencesValue instance.
int OH_PreferencesValue_SetIntArray(const OH_PreferencesValue *object, const int *value, uint32_t count)	Sets an integer array for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetIntArray(const OH_PreferencesValue *object, int **value, uint32_t *count)	Obtains an integer array from an OH_PreferencesValue instance.
int OH_PreferencesValue_SetBoolArray(const OH_PreferencesValue *object, const bool *value, uint32_t count)	Sets a boolean array for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetBoolArray(const OH_PreferencesValue *object, bool **value, uint32_t *count)	Obtains a boolean array from an OH_PreferencesValue instance.
int OH_PreferencesValue_SetStringArray(const OH_PreferencesValue *object, const char **value, uint32_t count)	Sets a string array for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetStringArray(const OH_PreferencesValue *object, char ***value, uint32_t *count)	Obtains a string array of an OH_PreferencesValue instance.
int OH_PreferencesValue_SetInt64Array(const OH_PreferencesValue *object, const int64_t *value, uint32_t count)	Sets an int64 array for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetInt64Array(const OH_PreferencesValue *object, int64_t **value, uint32_t *count)	Obtains an int64 array from an OH_PreferencesValue instance.
int OH_PreferencesValue_SetDoubleArray(const OH_PreferencesValue *object, const double *value, uint32_t count)	Sets a double array for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetDoubleArray(const OH_PreferencesValue *object, double **value, uint32_t *count)	Obtains a double array of an OH_PreferencesValue instance.
int OH_PreferencesValue_SetBlob(const OH_PreferencesValue *object, const uint8_t *value, uint32_t count)	Sets a blob value for an OH_PreferencesValue instance.
int OH_PreferencesValue_GetBlob(const OH_PreferencesValue *object, uint8_t **value, uint32_t *count)	Obtains a blob value from an OH_PreferencesValue instance.

Enum Description

Preference_ValueType

enum Preference_ValueType

Description

Enumerates the data types of PreferencesValue.

Since: 13

Enum Item	Description
PREFERENCE_TYPE_NULL = 0	Null.
PREFERENCE_TYPE_INT	Integer.
PREFERENCE_TYPE_BOOL	Boolean.
PREFERENCE_TYPE_STRING	String.
PREFERENCE_TYPE_INT64	64-bit integer. Since: 23
PREFERENCE_TYPE_DOUBLE	Double. Since: 23
PREFERENCE_TYPE_INT_ARRAY	Integer array. Since: 23
PREFERENCE_TYPE_BOOL_ARRAY	Boolean array. Since: 23
PREFERENCE_TYPE_STRING_ARRAY	String array. Since: 23
PREFERENCE_TYPE_INT64_ARRAY	64-bit integer array. Since: 23
PREFERENCE_TYPE_DOUBLE_ARRAY	Double array. Since: 23
PREFERENCE_TYPE_BLOB	Blob. Since: 23
PREFERENCE_TYPE_BUTT	End type.

Function Description

OH_PreferencesPair_GetKey()

const char *OH_PreferencesPair_GetKey(const OH_PreferencesPair *pairs, uint32_t index)

Description

Obtains the key based on the specified index from the KV data.

Since: 13

Parameters

Name	Description
const OH_PreferencesPair *pairs	Pointer to the target OH_PreferencesPair.
uint32_t index	Index of the target OH_PreferencesPair.

Returns

Type	Description
const char *	Returns the pointer to the key obtained if the operation is successful; returns a null pointer if the operation fails or invalid parameters are specified.

OH_PreferencesPair_GetPreferencesValue()

const OH_PreferencesValue *OH_PreferencesPair_GetPreferencesValue(const OH_PreferencesPair *pairs, uint32_t index)

Description

Obtains the value based on the specified index from the KV pairs.

Since: 13

Parameters

Name	Description
const OH_PreferencesPair *pairs	Pointer to the target OH_PreferencesPair.
uint32_t index	Index of the target OH_PreferencesPair.

Returns

Type	Description
const OH_PreferencesValue	Returns the pointer to the value obtained if the operation is successful; returns a null pointer if the operation fails or invalid parameters are specified.

OH_PreferencesValue_GetValueType()

Preference_ValueType OH_PreferencesValue_GetValueType(const OH_PreferencesValue *object)

Description

Obtains the data type of a PreferencesValue instance.

Since: 13

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the OH_PreferencesValue instance.

Returns

Type	Description
Preference_ValueType	Returns the obtained data type. If PREFERENCE_TYPE_NULL is returned, invalid parameters are passed in.

OH_PreferencesValue_GetInt()

int OH_PreferencesValue_GetInt(const OH_PreferencesValue *object, int *value)

Description

Obtains an integer from an OH_PreferencesValue instance.

Since: 13

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the OH_PreferencesValue instance.
int *value	Pointer to the integer value obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetBool()

int OH_PreferencesValue_GetBool(const OH_PreferencesValue *object, bool *value)

Description

Obtains a Boolean value from an OH_PreferencesValue instance.

Since: 13

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the OH_PreferencesValue instance.
bool *value	Pointer to the Boolean value obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetString()

int OH_PreferencesValue_GetString(const OH_PreferencesValue *object, char **value, uint32_t *valueLen)

Description

Obtains a string from an OH_PreferencesValue instance.

Since: 13

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the OH_PreferencesValue instance.
char **value	Double pointer to the string obtained. If the string is not required, you can use OH_Preferences_FreeString to free the string (release the memory occupied by the string).
uint32_t *valueLen	Pointer to the length of the string obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesPair_Destroy()

void OH_PreferencesPair_Destroy(OH_PreferencesPair *pairs, uint32_t count)

Description

Destroys an OH_PreferencesPair instance.

Since: 23

Parameters

Name	Description
OH_PreferencesPair *pairs	Pointer to the target OH_PreferencesPair instance.
uint32_t count	Size of the KV array to be destroyed.

OH_PreferencesValue_Create()

OH_PreferencesValue* OH_PreferencesValue_Create(void)

Description

Creates an OH_PreferencesValue instance.

Since: 23

Returns

Type	Description
OH_PreferencesValue*	Returns the pointer to the OH_PreferencesValue object; returns a null pointer otherwise.

OH_PreferencesValue_Destroy()

void OH_PreferencesValue_Destroy(OH_PreferencesValue *value)

Description

Destroys an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
OH_PreferencesValue *value	Pointer to the target OH_PreferencesValue instance.

OH_PreferencesValue_SetInt()

int OH_PreferencesValue_SetInt(const OH_PreferencesValue *object, int value)

Description

Sets an integer value for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
int value	Integer value to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetBool()

int OH_PreferencesValue_SetBool(const OH_PreferencesValue *object, bool value)

Description

Sets a boolean value for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
bool value	Boolean value to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetString()

int OH_PreferencesValue_SetString(const OH_PreferencesValue *object, const char *value)

Description

Sets a string value for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
const char *value	String value to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetInt64()

int OH_PreferencesValue_SetInt64(const OH_PreferencesValue *object, int64_t value)

Description

Sets an int64 value for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
int64_t value	Int64 value to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetInt64()

int OH_PreferencesValue_GetInt64(const OH_PreferencesValue *object, int64_t *value)

Description

Obtains an int64 value from an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
int64_t *value	Pointer to the obtained int64 value.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetDouble()

int OH_PreferencesValue_SetDouble(const OH_PreferencesValue *object, double value)

Description

Sets a double value for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
double value	Double value to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetDouble()

int OH_PreferencesValue_GetDouble(const OH_PreferencesValue *object, double *value)

Description

Obtains a double value from an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
double *value	Pointer to the obtained double value.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetIntArray()

int OH_PreferencesValue_SetIntArray(const OH_PreferencesValue *object, const int *value, uint32_t count)

Description

Sets an integer array for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
const int *value	Integer array to be set.
uint32_t count	Pointer to the size of the array to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetIntArray()

int OH_PreferencesValue_GetIntArray(const OH_PreferencesValue *object, int **value, uint32_t *count)

Description

Obtains an integer array from an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
int **value	Double pointer to the obtained integer array.
uint32_t *count	Pointer to the size of the array obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetBoolArray()

int OH_PreferencesValue_SetBoolArray(const OH_PreferencesValue *object, const bool *value, uint32_t count)

Description

Sets a boolean array for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
const bool *value	Boolean array to be set.
uint32_t count	Pointer to the size of the array to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetBoolArray()

int OH_PreferencesValue_GetBoolArray(const OH_PreferencesValue *object, bool **value, uint32_t *count)

Description

Obtains a boolean array from an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
bool **value	Double pointer to the obtained boolean array.
uint32_t *count	Pointer to the size of the array obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetStringArray()

int OH_PreferencesValue_SetStringArray(const OH_PreferencesValue *object, const char **value, uint32_t count)

Description

Sets a string array for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
const char **value	String array to be set.
uint32_t count	Pointer to the size of the array to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetStringArray()

int OH_PreferencesValue_GetStringArray(const OH_PreferencesValue *object, char ***value, uint32_t *count)

Description

Obtains a string array of an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
char ***value	Double pointer to the obtained string array.
uint32_t *count	Pointer to the size of the array obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetInt64Array()

int OH_PreferencesValue_SetInt64Array(const OH_PreferencesValue *object, const int64_t *value, uint32_t count)

Description

Sets an int64 array for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
const int64_t *value	Int64 array to be set.
uint32_t count	Pointer to the size of the array to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetInt64Array()

int OH_PreferencesValue_GetInt64Array(const OH_PreferencesValue *object, int64_t **value, uint32_t *count)

Description

Obtains an int64 array from an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
int64_t **value	Double pointer to the obtained int64 array.
uint32_t *count	Pointer to the size of the array obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetDoubleArray()

int OH_PreferencesValue_SetDoubleArray(const OH_PreferencesValue *object, const double *value, uint32_t count)

Description

Sets a double array for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
const double *value	Double array to be set.
uint32_t count	Pointer to the size of the array to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetDoubleArray()

int OH_PreferencesValue_GetDoubleArray(const OH_PreferencesValue *object, double **value, uint32_t *count)

Description

Obtains a double array of an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
double **value	Double pointer to the obtained double array.
uint32_t *count	Pointer to the size of the array obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_SetBlob()

int OH_PreferencesValue_SetBlob(const OH_PreferencesValue *object, const uint8_t *value, uint32_t count)

Description

Sets a blob value for an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
const uint8_t *value	Blob value to be set.
uint32_t count	Pointer to the size of the blob value to be set.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

OH_PreferencesValue_GetBlob()

int OH_PreferencesValue_GetBlob(const OH_PreferencesValue *object, uint8_t **value, uint32_t *count)

Description

Obtains a blob value from an OH_PreferencesValue instance.

Since: 23

Parameters

Name	Description
const OH_PreferencesValue *object	Pointer to the target OH_PreferencesValue instance.
uint8_t **value	Double pointer to the obtained blob value.
uint32_t *count	Pointer to the size of the blob value obtained.

Returns

Type	Description
int	Returns an error code. PREFERENCES_OK indicates the operation is successful. PREFERENCES_ERROR_INVALID_PARAM indicates invalid parameters are specified. PREFERENCES_ERROR_STORAGE indicates a storage exception. PREFERENCES_ERROR_MALLOC indicates a failure in memory allocation.

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