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Showing content from http://java-native-access.github.io/jna/5.17.0/javadoc/com/sun/jna/Pointer.html below:

Pointer (JNA API)

Bekannte direkte Unterklassen:: Function, Memory

public class Pointer extends Object

An abstraction for a native pointer data type. A Pointer instance represents, on the Java side, a native pointer. The native pointer could be any

type

of native pointer. Methods such as

write

read

getXXX

, and

setXXX

, provide means to access memory underlying the native pointer.

While a constructor exists to create a Pointer from an integer value, it's not generally a good idea to be creating pointers that way.

Autor:

Sheng Liang, originator, Todd Fast, suitability modifications, Timothy Wall, robust library loading

Siehe auch:

Function

Feldübersicht
Felder

Convenience constant, same as null.

protected long

Pointer value of the real native pointer.
Konstruktorübersicht
Konstruktoren

Derived class must assign peer pointer value.

Create from native pointer.
Methodenübersicht
void

Zero memory for the given number of bytes.

Convenience constant, equivalent to (void*)CONSTANT.

Convenience constant, equivalent to (void*)CONSTANT.
dump(long offset, int size)
Dump memory for debugging purposes.

boolean

byte

Indirect the native pointer as a pointer to byte.

byte[]

Read a native array of bytes of size
arraySize
from the given
offset
from this
Pointer
.

Get a ByteBuffer mapped to the memory pointed to by the pointer, ensuring the buffer uses native byte order.

char

Indirect the native pointer as a pointer to wchar_t.

char[]

Read a native array of wchar_t of size
arraySize
from the given
offset
from this
Pointer
.

double

Indirect the native pointer as a pointer to double.

double[]

Read a native array of double of size
arraySize
from the given
offset
from this
Pointer
.

float

Indirect the native pointer as a pointer to float.

float[]

Read a native array of float of size
arraySize
from the given
offset
from this
Pointer
.

int

Indirect the native pointer as a pointer to int.

int[]

Read a native array of int32 of size
arraySize
from the given
offset
from this
Pointer
.

long

Indirect the native pointer as a pointer to long.

long[]

Read a native array of int64 of size
arraySize
from the given
offset
from this
Pointer
.

Indirect the native pointer as a pointer to long.

Indirect the native pointer as a pointer to pointer.

Returns an array of
Pointer
of the requested size.

short

Indirect the native pointer as a pointer to short.

short[]

Read a native array of int16 of size
arraySize
from the given
offset
from this
Pointer
.

Copy native memory to a Java String.

Copy native memory to a Java String using the requested encoding.

Returns an array of String based on a native array of char *.

Returns an array of String based on a native array of char *, using the given array length.

Returns an array of String based on a native array of char* or wchar_t* based on the wide parameter, using the given array length.

Returns an array of String based on a native array of char *, using the requested encoding.

Read a wide (const wchar_t *) string from memory.

int

long

Returns the offset of the given value in memory from the given offset, or -1 if the value is not found.

static long

Read the native peer value.

static void

Set the native peer value.

void
read(long offset, byte[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void
read(long offset, char[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void
read(long offset, double[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void
read(long offset, float[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void
read(long offset, int[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void
read(long offset, long[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void
read(long offset, short[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void
read(long offset, Pointer[] buf, int index, int length)
Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.

void

Set value at location being pointed to.

void

Set value at location being pointed to.

void

Set value at location being pointed to.

void

Set value at location being pointed to.

void
setInt(long offset, int value)
Set value at location being pointed to.

void

Set value at location being pointed to.

void
setMemory(long offset, long length, byte value)
Write value to the requested bank of memory.

void

Set value at location being pointed to.

void

Set value at location being pointed to.

void

Set value at location being pointed to.

void

Copy string value to the location being pointed to as a wide string (wchar_t*).

void

void

Copy string value to the location being pointed to, using the requested encoding.

(Package privat) void

void

Copy string value to the location being pointed to as a wide string (wchar_t*).

Provide a view of this memory using the given offset to calculate a new base address.
share(long offset, long sz)
Provide a view of this memory using the given offset to calculate a new base address, bounds-limiting the memory with the given size.

void
write(long offset, byte[] buf, int index, int length)
Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.

void
write(long offset, char[] buf, int index, int length)
Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.

void
write(long offset, double[] buf, int index, int length)
Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.

void
write(long offset, float[] buf, int index, int length)
Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.

void
write(long offset, int[] buf, int index, int length)
Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.

void
write(long offset, long[] buf, int index, int length)
Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.

void
write(long offset, short[] buf, int index, int length)
Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.

void

Write the given array of Pointer to native memory.

Felddetails
- NULL
  Convenience constant, same as null.
- peer
  protected long peer
  
  Pointer value of the real native pointer. Use long to be 64-bit safe.
Konstruktordetails
- Pointer
  Pointer()
  
  Derived class must assign peer pointer value.
- Pointer
  public Pointer(long peer)
  
  Create from native pointer. Don't use this unless you know what you're doing.
Methodendetails
- createConstant public static final Pointer createConstant(long peer)
  Convenience constant, equivalent to (void*)CONSTANT.
- createConstant public static final Pointer createConstant(int peer)
  Convenience constant, equivalent to (void*)CONSTANT. This version will avoid setting any of the high bits on 64-bit systems.
- clear
  public void clear(long size)
  
  Zero memory for the given number of bytes.
- equals public boolean equals(Object o)
  
  Setzt außer Kraft:
  
  equals in Klasse Object
- hashCode
  public int hashCode()
  
  Setzt außer Kraft:
  
  hashCode in Klasse Object
- indexOf
  public long indexOf(long offset, byte value)
  
  Returns the offset of the given value in memory from the given offset, or -1 if the value is not found.
- read
  public void read(long offset, byte[] buf, int index, int length)
  
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - byte array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- read
  public void read(long offset, short[] buf, int index, int length)
  
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - short array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- read
  public void read(long offset, char[] buf, int index, int length)
  
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - char array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- read
  public void read(long offset, int[] buf, int index, int length)
  
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - int array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- read
  public void read(long offset, long[] buf, int index, int length)
  
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - long array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- read
  public void read(long offset, float[] buf, int index, int length)
  
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - float array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- read
  public void read(long offset, double[] buf, int index, int length)
  
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - double array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- read public void read(long offset, Pointer[] buf, int index, int length)
  Indirect the native pointer, copying from memory pointed to by native pointer, into the specified array.
  
  Parameter:
  
  offset - byte offset from pointer from which data is copied
  
  buf - Pointer array into which data is copied
  
  index - array index to which data is copied
  
  length - number of elements from native pointer that must be copied
- write
  public void write(long offset, byte[] buf, int index, int length)
  
  Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.
  
  Parameter:
  
  offset - byte offset from pointer into which data is copied
  
  buf - byte array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- write
  public void write(long offset, short[] buf, int index, int length)
  
  Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.
  
  Parameter:
  
  offset - byte offset from pointer into which data is copied
  
  buf - short array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- write
  public void write(long offset, char[] buf, int index, int length)
  
  Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.
  
  Parameter:
  
  offset - byte offset from pointer into which data is copied
  
  buf - char array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- write
  public void write(long offset, int[] buf, int index, int length)
  
  Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.
  
  Parameter:
  
  offset - byte offset from pointer into which data is copied
  
  buf - int array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- write
  public void write(long offset, long[] buf, int index, int length)
  
  Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.
  
  Parameter:
  
  offset - byte offset from pointer into which data is copied
  
  buf - long array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- write
  public void write(long offset, float[] buf, int index, int length)
  
  Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.
  
  Parameter:
  
  offset - byte offset from pointer into which data is copied
  
  buf - float array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- write
  public void write(long offset, double[] buf, int index, int length)
  
  Indirect the native pointer, copying into memory pointed to by native pointer, from the specified array.
  
  Parameter:
  
  offset - byte offset from pointer into which data is copied
  
  buf - double array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- write public void write(long bOff, Pointer[] buf, int index, int length)
  Write the given array of Pointer to native memory.
  
  Parameter:
  
  bOff - byte offset from pointer into which data is copied
  
  buf - Pointer array from which to copy
  
  index - array index from which to start copying
  
  length - number of elements from buf that must be copied
- getValue
- getByte
  public byte getByte(long offset)
  
  Indirect the native pointer as a pointer to byte. This is equivalent to the expression *((jbyte *)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the byte value being pointed to
- getChar
  public char getChar(long offset)
  
  Indirect the native pointer as a pointer to wchar_t. This is equivalent to the expression *((wchar_t*)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the wchar_t value being pointed to
- getShort
  public short getShort(long offset)
  
  Indirect the native pointer as a pointer to short. This is equivalent to the expression *((jshort *)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - byte offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the short value being pointed to
- getInt
  public int getInt(long offset)
  
  Indirect the native pointer as a pointer to int. This is equivalent to the expression *((jint *)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - byte offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the int value being pointed to
- getLong
  public long getLong(long offset)
  
  Indirect the native pointer as a pointer to long. This is equivalent to the expression *((jlong *)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - byte offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the long value being pointed to
- getNativeLong
  Indirect the native pointer as a pointer to long. This is equivalent to the expression *((long *)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - byte offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the long value being pointed to
- getFloat
  public float getFloat(long offset)
  
  Indirect the native pointer as a pointer to float. This is equivalent to the expression *((jfloat *)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - byte offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the float value being pointed to
- getDouble
  public double getDouble(long offset)
  
  Indirect the native pointer as a pointer to double. This is equivalent to the expression *((jdouble *)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - byte offset from pointer to perform the indirection
  
  Gibt zurück:
  
  the double value being pointed to
- getPointer public Pointer getPointer(long offset)
  Indirect the native pointer as a pointer to pointer. This is equivalent to the expression *((void **)((char *)Pointer + offset)).
  
  Parameter:
  
  offset - byte offset from pointer to perform the indirection
  
  Gibt zurück:
  
  a Pointer equivalent of the pointer value being pointed to, or null if the pointer value is NULL;
- getByteBuffer public ByteBuffer getByteBuffer(long offset, long length)
  Get a ByteBuffer mapped to the memory pointed to by the pointer, ensuring the buffer uses native byte order.
  
  Parameter:
  
  offset - byte offset from pointer to start the buffer
  
  length - Length of ByteBuffer
  
  Gibt zurück:
  
  a direct ByteBuffer that accesses the memory being pointed to,
- getWideString public String getWideString(long offset)
  Read a wide (const wchar_t *) string from memory.
- getString public String getString(long offset)
  
  Parameter:
  
  offset - byte offset from pointer to start reading bytes
  
  Gibt zurück:
  
  the String value being pointed to
- getString
  Copy native memory to a Java String using the requested encoding.
  
  Parameter:
  
  offset - byte offset from pointer to obtain the native string
  
  encoding - the desired encoding
  
  Gibt zurück:
  
  the String value being pointed to
- getByteArray
  public byte[] getByteArray(long offset, int arraySize)
  
  Read a native array of bytes of size
  arraySize
  from the given
  offset
  from this
  Pointer
  .
- getCharArray
  public char[] getCharArray(long offset, int arraySize)
  
  Read a native array of wchar_t of size
  arraySize
  from the given
  offset
  from this
  Pointer
  .
- getShortArray
  public short[] getShortArray(long offset, int arraySize)
  
  Read a native array of int16 of size
  arraySize
  from the given
  offset
  from this
  Pointer
  .
- getIntArray
  public int[] getIntArray(long offset, int arraySize)
  
  Read a native array of int32 of size
  arraySize
  from the given
  offset
  from this
  Pointer
  .
- getLongArray
  public long[] getLongArray(long offset, int arraySize)
  
  Read a native array of int64 of size
  arraySize
  from the given
  offset
  from this
  Pointer
  .
- getFloatArray
  public float[] getFloatArray(long offset, int arraySize)
  
  Read a native array of float of size
  arraySize
  from the given
  offset
  from this
  Pointer
  .
- getDoubleArray
  public double[] getDoubleArray(long offset, int arraySize)
  
  Read a native array of double of size
  arraySize
  from the given
  offset
  from this
  Pointer
  .
- getPointerArray public Pointer[] getPointerArray(long offset)
  Returns an array of
  Pointer
  . The array length is determined by a NULL-valued terminating element.
- getPointerArray public Pointer[] getPointerArray(long offset, int arraySize)
  Returns an array of
  Pointer
  of the requested size.
- getStringArray public String[] getStringArray(long offset)
  Returns an array of String based on a native array of char *. The array length is determined by a NULL-valued terminating element.
  
  The strings are decoded using the encoding returned by
  Native.getDefaultStringEncoding()
  .
- getStringArray public String[] getStringArray(long offset, String encoding)
  Returns an array of String based on a native array of char *, using the requested encoding. The array length is determined by a NULL-valued terminating element.
- getStringArray public String[] getStringArray(long offset, int length)
  Returns an array of String based on a native array of char *, using the given array length.
  
  The strings are decoded using the encoding returned by
  Native.getDefaultStringEncoding()
  .
- getWideStringArray public String[] getWideStringArray(long offset)
- getWideStringArray public String[] getWideStringArray(long offset, int length)
- getStringArray public String[] getStringArray(long offset, int length, String encoding)
  Returns an array of String based on a native array of char* or wchar_t* based on the wide parameter, using the given array length.
  
  Parameter:
  
  offset -
  
  length -
  
  encoding -
- setValue void setValue(long offset, Object value, Class<?> type)
- setMemory
  public void setMemory(long offset, long length, byte value)
  
  Write value to the requested bank of memory.
  
  Parameter:
  
  offset - byte offset from pointer to start
  
  length - number of bytes to write
  
  value - value to be written
- setByte
  public void setByte(long offset, byte value)
  
  Set value at location being pointed to. This is equivalent to the expression *((jbyte *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - byte value to set
- setShort
  public void setShort(long offset, short value)
  
  Set value at location being pointed to. This is equivalent to the expression *((jshort *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - short value to set
- setChar
  public void setChar(long offset, char value)
  
  Set value at location being pointed to. This is equivalent to the expression *((wchar_t *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - char value to set
- setInt
  public void setInt(long offset, int value)
  
  Set value at location being pointed to. This is equivalent to the expression *((jint *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - int value to set
- setLong
  public void setLong(long offset, long value)
  
  Set value at location being pointed to. This is equivalent to the expression *((jlong *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - long value to set
- setNativeLong public void setNativeLong(long offset, NativeLong value)
  Set value at location being pointed to. This is equivalent to the expression *((long *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - long value to set
- setFloat
  public void setFloat(long offset, float value)
  
  Set value at location being pointed to. This is equivalent to the expression *((jfloat *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - float value to set
- setDouble
  public void setDouble(long offset, double value)
  
  Set value at location being pointed to. This is equivalent to the expression *((jdouble *)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - double value to set
- setPointer public void setPointer(long offset, Pointer value)
  Set value at location being pointed to. This is equivalent to the expression *((void **)((char *)Pointer + offset)) = value.
  
  Parameter:
  
  offset - byte offset from pointer at which value must be set
  
  value - Pointer holding the actual pointer value to set, which may be null to indicate a NULL pointer.
- setWideString public void setWideString(long offset, String value)
  Copy string value to the location being pointed to as a wide string (wchar_t*).
  
  Parameter:
  
  offset - byte offset from pointer at which characters in value must be set
  
  value - java.lang.String value to set
- setString public void setString(long offset, WString value)
  Copy string value to the location being pointed to as a wide string (wchar_t*).
  
  Parameter:
  
  offset - byte offset from pointer at which characters in value must be set
  
  value - WString value to set
- setString public void setString(long offset, String value)
  
  Parameter:
  
  offset - byte offset from pointer at which characters in value must be set
  
  value - java.lang.String value to set
- setString public void setString(long offset, String value, String encoding)
  Copy string value to the location being pointed to, using the requested encoding.
  
  Parameter:
  
  offset - byte offset from pointer at which characters in value must be set
  
  value - java.lang.String value to set
  
  encoding - desired encoding
- dump public String dump(long offset, int size)
  Dump memory for debugging purposes.
- toString
  
  Setzt außer Kraft:
  
  toString in Klasse Object
- nativeValue public static long nativeValue(Pointer p)
  Read the native peer value. Use with caution.
- nativeValue public static void nativeValue(Pointer p, long value)
  Set the native peer value. Use with caution.

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