本文整理了Java中com.sun.jna.Memory类的一些代码示例，展示了Memory类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Memory类的具体详情如下：
包路径：com.sun.jna.Memory
类名称：Memory

Memory介绍

[英]A Pointer to memory obtained from the native heap via a call to malloc.

In some cases it might be necessary to use memory obtained from malloc. For example, Memory helps accomplish the following idiom:

void *buf = malloc(BUF_LEN * sizeof(char)); 
call_some_function(buf); 
free(buf);

The #finalize method will free allocated memory when this object is no longer referenced.
[中]通过调用malloc从本机堆获得的Pointer内存。
在某些情况下，可能需要使用从malloc获得的内存。例如，Memory有助于实现以下习惯用法：

void *buf = malloc(BUF_LEN * sizeof(char)); 
call_some_function(buf); 
free(buf);

当不再引用此对象时，#finalize方法将释放分配的内存。

代码示例

代码示例来源：origin: jenkinsci/jenkins

IntByReference ref = new IntByReference(sizeOfInt);
IntByReference size = new IntByReference(sizeOfInt);
Memory m;
int nRetry = 0;
    throw new IOException("Failed to obtain memory requirement: "+LIBC.strerror(Native.getLastError()));
  m = new Memory(size.getValue());
  if(LIBC.sysctl(MIB_PROC_ALL,3, m, size, NULL, ref)!=0) {
    if(Native.getLastError()==ENOMEM && nRetry++<16)
      continue; // retry
    throw new IOException("Failed to call kern.proc.all: "+LIBC.strerror(Native.getLastError()));
for( int base=0; base<size.getValue(); base+=sizeOf_kinfo_proc) {
  int pid = m.getInt(base+ kinfo_proc_pid_offset);
  int ppid = m.getInt(base+ kinfo_proc_ppid_offset);

代码示例来源：origin: net.java.dev.jna/jna

/** Provide a view of this memory using the given offset as the base address.  The
 * returned {@link Pointer} will have a size equal to that of the original
 * minus the offset.
 * @throws IndexOutOfBoundsException if the requested memory is outside
 * the allocated bounds.
 */
@Override
public Pointer share(long offset) {
  return share(offset, size() - offset);
}

代码示例来源：origin: jenkinsci/jenkins

Memory m = new Memory(psize);
int fd = LIBC.open(getFile("as").getAbsolutePath(), 0);
  LIBC.pread(fd, m, new NativeLong(psize), new NativeLong(pr_argp));
  long argp = b64 ? m.getLong(0) : to64(m.getInt(0));
    LIBC.pread(fd, m, new NativeLong(psize), new NativeLong(argp+(n*psize)));
    long addr = b64 ? m.getLong(0) : to64(m.getInt(0));

代码示例来源：origin: jenkinsci/jenkins

public static File getTempDir() {
  Memory buf = new Memory(1024);
  if (Kernel32.INSTANCE.GetTempPathW(512,buf)!=0) {// the first arg is number of wchar
    return new File(buf.getString(0, true));
  } else {
    return null;
  }
}

代码示例来源：origin: jenkinsci/jenkins

private String readLine(int fd, long addr, String prefix) throws IOException {
    if(LOGGER.isLoggable(FINEST))
      LOGGER.finest("Reading "+prefix+" at "+addr);
    Memory m = new Memory(1);
    byte ch = 1;
    ByteArrayOutputStream buf = new ByteArrayOutputStream();
    int i = 0;
    while(true) {
      if (i++ > LINE_LENGTH_LIMIT) {
        LOGGER.finest("could not find end of line, giving up");
        throw new IOException("could not find end of line, giving up");
      }
      long r = LIBC.pread(fd, m, new NativeLong(1), new NativeLong(addr));
      ch = m.getByte(0);
      if (ch == 0)
        break;
      buf.write(ch);
      addr++;
    }
    String line = buf.toString();
    if(LOGGER.isLoggable(FINEST))
      LOGGER.finest(prefix+" was "+line);
    return line;
  }
}

代码示例来源：origin: broadgsa/gatk

private static List<String> getJobIds(PointerByReference jobIds) throws DrmaaException {
  List<String> jobIdsList = new ArrayList<String>();
  IntByReference size = new IntByReference();
  int errnum;
  errnum = LibDrmaa.drmaa_get_num_job_ids(jobIds.getValue(), size);
  checkError(errnum, "unable to get jobIds");
  int num = size.getValue();
  Memory value = new Memory(LibDrmaa.DRMAA_JOBNAME_BUFFER);
  for (int i = 1; i <= num; i++) {
    errnum = LibDrmaa.drmaa_get_next_job_id(jobIds.getValue(), value, LibDrmaa.DRMAA_JOBNAME_BUFFER_LEN);
    checkError(errnum, "unable to get jobId " + i);
    if (errnum == LibDrmaa.DRMAA_ERRNO.DRMAA_ERRNO_NO_MORE_ELEMENTS)
      break;
    jobIdsList.add(value.getString(0));
  }
  return jobIdsList;
}

代码示例来源：origin: mmarquee/ui-automation

/**
   * Gets the version info (if present) from the file in the path.
   * @param path Pathname to file
   * @return The version info array (loads of integers)
   */
  public static int[] getVersionInfo(final String path) {
    IntByReference dwDummy = new IntByReference();
    dwDummy.setValue(0);

    int versionlength = com.sun.jna.platform.win32.Version.INSTANCE.GetFileVersionInfoSize(path, dwDummy);

    byte[] bufferarray = new byte[versionlength];
    Pointer lpData = new Memory(bufferarray.length);
    PointerByReference lplpBuffer = new PointerByReference();
    IntByReference puLen = new IntByReference();
    com.sun.jna.platform.win32.Version.INSTANCE.GetFileVersionInfo(path, 0, versionlength, lpData);
    com.sun.jna.platform.win32.Version.INSTANCE.VerQueryValue(lpData, "\\", lplpBuffer, puLen);

    VerRsrc.VS_FIXEDFILEINFO lplpBufStructure = new VerRsrc.VS_FIXEDFILEINFO(lplpBuffer.getValue());
    lplpBufStructure.read();

    int v1 = (lplpBufStructure.dwFileVersionMS).intValue() >> 16;
    int v2 = (lplpBufStructure.dwFileVersionMS).intValue() & 0xffff;
    int v3 = (lplpBufStructure.dwFileVersionLS).intValue() >> 16;
    int v4 = (lplpBufStructure.dwFileVersionLS).intValue() & 0xffff;
    System.out.println("Version: " + v1 + "." + v2 + "." + v3 + "." + v4);
    return new int[]{v1, v2, v3, v4};
  }
}

代码示例来源：origin: ch.epfl.scala/command

@Override
  public int read(byte[] b, int off, int len) throws IOException {
    Memory readBuffer = new Memory(len);
    WinBase.OVERLAPPED olap = new WinBase.OVERLAPPED();
    olap.hEvent = readerWaitable;
    olap.write();
    boolean immediate = API.ReadFile(handle, readBuffer, len, null, olap.getPointer());
    if (!immediate) {
      int lastError = API.GetLastError();
      if (lastError != WinError.ERROR_IO_PENDING) {
        throw new IOException("ReadFile() failed: " + lastError);
      }
    }
    IntByReference read = new IntByReference();
    if (!API.GetOverlappedResult(handle, olap.getPointer(), read, true)) {
      int lastError = API.GetLastError();
      throw new IOException("GetOverlappedResult() failed for read operation: " + lastError);
    }
    int actualLen = read.getValue();
    byte[] byteArray = readBuffer.getByteArray(0, actualLen);
    System.arraycopy(byteArray, 0, b, off, actualLen);
    return actualLen;
  }
}

代码示例来源：origin: stackoverflow.com

int strSize = 255;
int result = 0;
IntByReference byteIO = new IntByReference();
Pointer lngVarPtr1 = null;Pointer lngMemVar1 = null;
Pointer lngVarPtr2 = null;Pointer lngMemVar2 = null;
int lngMemLen1; int lngMemLen2;
lngProcID = new PointerByReference();
int ThreadId = user32.GetWindowThreadProcessId(hWnd, lngProcID);
lngProcHandle = Kernel32.OpenProcess(Kernel32.PROCESS_VM_OPERATION | Kernel32.PROCESS_VM_WRITE | Kernel32.PROCESS_VM_READ, false, lngProcID.getValue());
lngVarPtr1 = new Memory(strSize + 1);
result = Kernel32.ReadProcessMemory(lngProcHandle, lngMemVar1, lngVarPtr1, lngMemLen1, byteIO);
result = Kernel32.CloseHandle(lngProcHandle);
return lngVarPtr1.getWideString(0);

代码示例来源：origin: kaitoy/pcap4j

private MacAddress getMacAddress(String nifName) {
 Pointer lpAdapter = NativePacketDllMappings.PacketOpenAdapter(nifName);
 long hFile = -1;
 if (lpAdapter != null) {
  if (Native.POINTER_SIZE == 4) {
   hFile = lpAdapter.getInt(0);
  } else {
   hFile = lpAdapter.getLong(0);
  }
 }
 if (hFile == -1L) {
  int err = Native.getLastError();
  logger.error("Unable to open the NIF {}, Error Code: {}", nifName, err);
  return null;
 }
 Memory mem = new Memory(NativePacketDllMappings.PACKET_OID_DATA_SIZE);
 mem.clear();
 PACKET_OID_DATA oidData = new PACKET_OID_DATA(mem);
 oidData.Length = new NativeLong(6L);
 oidData.Oid = new NativeLong(0x01010102L);
 int status = NativePacketDllMappings.PacketRequest(lpAdapter, 0, oidData);
 NativePacketDllMappings.PacketCloseAdapter(lpAdapter);
 if (status == 0) {
  logger.error("Failed to retrieve the link layer address of the NIF: {}", nifName);
  return null;
 } else {
  return MacAddress.getByAddress(oidData.Data);
 }
}

代码示例来源：origin: com.googlecode.gstreamer-java/gstreamer-java

public NativeArgs(String progname, String[] args) {
  //
  // Allocate some native memory to pass the args down to the native layer
  //
  argsCopy = new Memory[args.length + 2];
  argvMemory = new Memory(argsCopy.length * Pointer.SIZE);
  
  //
  // Insert the program name as argv[0]
  //
  Memory arg = new Memory(progname.getBytes().length + 4);
  arg.setString(0, progname, false);
  argsCopy[0] = arg;
  
  for (int i = 0; i < args.length; i++) {
    arg = new Memory(args[i].getBytes().length + 1);
    arg.setString(0, args[i], false);
    argsCopy[i + 1] = arg;
  }
  argvMemory.write(0, argsCopy, 0, argsCopy.length);
  argvRef = new PointerByReference(argvMemory);
  argcRef = new IntByReference(args.length + 1);
}
String[] toStringArray() {

代码示例来源：origin: net.openhft/affinity

byte[] buff = affinity.toByteArray();
final int cpuSetSizeInBytes = buff.length;
final Memory cpusetArray = new Memory(cpuSetSizeInBytes);
try {
  cpusetArray.write(0, buff, 0, buff.length);
  final int ret = lib.sched_setaffinity(0, cpuSetSizeInBytes, new PointerByReference(cpusetArray));
  if (ret < 0) {
    throw new IllegalStateException("sched_setaffinity((" + cpuSetSizeInBytes + ") , &(" + affinity + ") ) return " + ret);
  if (e.getErrorCode() != 22 || !Arrays.equals(buff, cpusetArray.getByteArray(0, cpuSetSizeInBytes))) {
    throw new IllegalStateException("sched_setaffinity((" + cpuSetSizeInBytes + ") , &(" + affinity + ") ) errorNo=" + e.getErrorCode(), e);
  throw new IllegalArgumentException("Cannot set zero affinity");
final IntByReference cpuset32 = new IntByReference(0);
cpuset32.setValue(value);
try {
  final int ret = lib.sched_setaffinity(0, Integer.SIZE / 8, cpuset32);
  if (ret < 0)
    throw new IllegalStateException("sched_setaffinity((" + Integer.SIZE / 8 + ") , &(" + Integer.toHexString(cpuset32.getValue()) + ") ) return " + ret);
} catch (LastErrorException e) {
  throw new IllegalStateException("sched_setaffinity((" + Integer.SIZE / 8 + ") , &(" + Integer.toHexString(cpuset32.getValue()) + ") ) errorNo=" + e.getErrorCode(), e);

代码示例来源：origin: org.jvnet.libzfs/libzfs

public String getZfsProperty(zfs_prop_t prop) {
  Memory propbuf = new Memory(libzfs.ZFS_MAXPROPLEN);
  char[] buf = null;
  IntByReference ibr = null;
  int ret = LIBZFS.zfs_prop_get(handle, new NativeLong(prop.ordinal()),
      propbuf, libzfs.ZFS_MAXPROPLEN, ibr, buf,
      new NativeLong(0), true);
  return ((ret != 0) ? null : propbuf.getString(0));
}

代码示例来源：origin: net.java.dev.jna/jna-platform

IntByReference dwDummy = new IntByReference();
  throw new Win32Exception(Native.getLastError());
Pointer lpData = new Memory(versionLength);
PointerByReference lplpBuffer = new PointerByReference();
  throw new Win32Exception(Native.getLastError());
IntByReference puLen = new IntByReference();
VS_FIXEDFILEINFO fileInfo = new VS_FIXEDFILEINFO(lplpBuffer.getValue());
fileInfo.read();
return fileInfo;

代码示例来源：origin: org.tmatesoft.svnkit/svnkit

public DATA_BLOB(byte[] bytes) {
  if (bytes != null) {
    int allocationSize = Math.max(1, bytes.length);
    cbData = new Memory(allocationSize);
    cbData.write(0, bytes, 0, bytes.length);
    cbSize = new NativeLong(bytes.length);
  } else {
    cbSize = new NativeLong(0);
    cbData = Pointer.NULL;
  }
}

代码示例来源：origin: jMonkeyEngine/jmonkeyengine

Pointer pchValue = new Memory(unBufferSize); 
IntByReference pError = new IntByReference();
if (pError.getValue() == ETrackedPropertyError.ETrackedPropertyError_TrackedProp_Success){
  str = pchValue.getString(0);
} else if (pError.getValue() == ETrackedPropertyError.ETrackedPropertyError_TrackedProp_BufferTooSmall){
  throw new IllegalArgumentException("Cannot access property \""+getETrackedDevicePropertyString(property)+"\" ("+property+") for device "+deviceIndex+": "+getETrackedPropertyErrorString(pError.getValue())+" ("+pError.getValue()+")");
} else if (pError.getValue() == ETrackedPropertyError.ETrackedPropertyError_TrackedProp_CouldNotContactServer){

代码示例来源：origin: org.kohsuke/akuma

private static String resolveSymlink(File link) throws IOException {
  String filename = link.getAbsolutePath();
  for (int sz=512; sz < 65536; sz*=2) {
    Memory m = new Memory(sz);
    int r = LIBC.readlink(filename,m,new NativeLong(sz));
    if (r<0) {
      int err = Native.getLastError();
      if (err==22/*EINVAL --- but is this really portable?*/)
        return null; // this means it's not a symlink
      throw new IOException("Failed to readlink "+link+" error="+ err+" "+ LIBC.strerror(err));
    }
    if (r==sz)
      continue;   // buffer too small
    byte[] buf = new byte[r];
    m.read(0,buf,0,r);
    return new String(buf);
  }
  throw new IOException("Failed to readlink "+link);
}

代码示例来源：origin: org.zeromq/zeromq-scala-binding

private zmq_msg_t newZmqMessage(byte[] msg) {
 zmq_msg_t message = new zmq_msg_t();
 if (msg.length == 0) {
  if (zmq.zmq_msg_init_size(message, new NativeLong(msg.length)) != 0) {
   raiseZMQException();
  }
 } else {
  Memory mem = new Memory(msg.length);
  mem.write(0, msg, 0, msg.length);
  if (zmq.zmq_msg_init_data(message, mem, new NativeLong(msg.length), messageDataBuffer, mem) == 0) {
   messageDataBuffer.add(mem);
  } else {
   raiseZMQException();
  }
 }
 return message;
}

代码示例来源：origin: net.java.dev.jna/jna-platform

retval = XAttr.INSTANCE.getxattr(path, name, (Memory) null, size_t.ZERO);
if (retval.longValue() < 0) {
  eno = Native.getLastError();
  throw new IOException("errno: " + eno);
valueMem = new Memory(retval.longValue());
retval = XAttr.INSTANCE.getxattr(path, name, valueMem, new size_t(valueMem.size()));
if (retval.longValue() < 0) {
  eno = Native.getLastError();
  if (eno != XAttr.ERANGE) {
    throw new IOException("errno: " + eno);

代码示例来源：origin: net.java.dev.jna/jna-platform

/**
 * Gets the specified channel configuration property.
 *
 * @param channelHandle [in] A handle to the channel's configuration properties that
 *                      the {@link Wevtapi#EvtOpenChannelConfig} function returns.
 * @param propertyId    [in] The identifier of the channel property to retrieve. For a list of property
 *                      identifiers, see the {@link Winevt.EVT_CHANNEL_CONFIG_PROPERTY_ID} enumeration.
 * @return EVT_VARIANT(already reading from native memory)
 */
public static EVT_VARIANT EvtGetChannelConfigProperty(EVT_HANDLE channelHandle, int propertyId) {
  IntByReference propertyValueBufferUsed = new IntByReference();
  boolean result = Wevtapi.INSTANCE.EvtGetChannelConfigProperty(channelHandle, propertyId, 0, 0, null, propertyValueBufferUsed);
  int errorCode = Kernel32.INSTANCE.GetLastError();
  if ((!result) && errorCode != Kernel32.ERROR_INSUFFICIENT_BUFFER) {
    throw new Win32Exception(errorCode);
  }
  Memory propertyValueBuffer = new Memory(propertyValueBufferUsed.getValue());
  result = Wevtapi.INSTANCE.EvtGetChannelConfigProperty(channelHandle, propertyId, 0, (int) propertyValueBuffer.size(),
      propertyValueBuffer, propertyValueBufferUsed);
  if (!result) {
    throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
  }
  EVT_VARIANT resultEvt = new EVT_VARIANT(propertyValueBuffer);
  resultEvt.read();
  return resultEvt;
}