Examples of com.sun.jna.Memory

com.sun.jna.Memory
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 {@link #finalize} method will free allocated memory whenthis object is no longer referenced. @author Sheng Liang, originator @author Todd Fast, suitability modifications @author Timothy Wall @see Pointer

                throw new Win32Exception(lastError);
            }
        }


        final int nLength = lpnSize.getValue();
        final Memory securityDescriptorMemoryPointer = new Memory(nLength);
        succeeded = Advapi32.INSTANCE.GetFileSecurity(new WString(
                absoluteFilePath), infoType, securityDescriptorMemoryPointer, nLength, lpnSize);


        if (!succeeded) {
            securityDescriptorMemoryPointer.clear();
            throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
        }


        return securityDescriptorMemoryPointer;
    }

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     * @param permissionToCheck the permission to check for the file
     * @return true if has access, otherwise false
     */
    public static boolean accessCheck(File file, AccessCheckPermission permissionToCheck) {
        boolean hasAccess = false;
        final Memory securityDescriptorMemoryPointer = getSecurityDescriptorForFile(file.getAbsolutePath().replaceAll("/", "\\"));


        HANDLEByReference openedAccessToken = null;
        final HANDLEByReference duplicatedToken = new HANDLEByReference();
        try{
            openedAccessToken = new HANDLEByReference();


            final int desireAccess = TOKEN_IMPERSONATE | TOKEN_QUERY | TOKEN_DUPLICATE | STANDARD_RIGHTS_READ;
            if(!Advapi32.INSTANCE.OpenProcessToken(Kernel32.INSTANCE.GetCurrentProcess(), desireAccess, openedAccessToken)) {
                throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
            }


            if(!Advapi32.INSTANCE.DuplicateToken(openedAccessToken.getValue(), SECURITY_IMPERSONATION_LEVEL.SecurityImpersonation, duplicatedToken)) {
                throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
            }


            final GENERIC_MAPPING mapping = new GENERIC_MAPPING();
            mapping.genericRead = new DWORD(FILE_GENERIC_READ);
            mapping.genericWrite = new DWORD(FILE_GENERIC_WRITE);
            mapping.genericExecute = new DWORD(FILE_GENERIC_EXECUTE);
            mapping.genericAll = new DWORD(FILE_ALL_ACCESS);


            final DWORDByReference rights = new DWORDByReference(new DWORD(permissionToCheck.getCode()));
            Advapi32.INSTANCE.MapGenericMask(rights, mapping);


            final PRIVILEGE_SET privileges = new PRIVILEGE_SET(1);
            privileges.PrivilegeCount = new DWORD(0);
            final DWORDByReference privilegeLength = new DWORDByReference(new DWORD(privileges.size()));


            final DWORDByReference grantedAccess = new DWORDByReference();
            final BOOLByReference result = new BOOLByReference();
            if(!Advapi32.INSTANCE.AccessCheck(securityDescriptorMemoryPointer,
                    duplicatedToken.getValue(),
                    rights.getValue(),
                    mapping,
                    privileges, privilegeLength, grantedAccess, result)) {
                throw new Win32Exception(Kernel32.INSTANCE.GetLastError());
            }


            hasAccess = result.getValue().booleanValue();


        } finally {


            if(openedAccessToken != null && openedAccessToken.getValue() != null) {
                Kernel32.INSTANCE.CloseHandle(openedAccessToken.getValue());
            }


            if(duplicatedToken != null && duplicatedToken.getValue() != null) {
                Kernel32.INSTANCE.CloseHandle(duplicatedToken.getValue());
            }


            if(securityDescriptorMemoryPointer != null) {
                securityDescriptorMemoryPointer.clear();
            }
        }


        return hasAccess;
    }

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                Raster raster = buf.getData();
                int w = bounds.width;
                int h = bounds.height;
                if (buffer == null || buffer.size() != w*h*4) {
                    buffer = new Memory(w*h*4);
                    pixels = new int[w*h];
                }
                for (int y=0;y<h;y++) {
                    for (int x=0;x < w;x++) {
                        raster.getPixel(x, y, pixel);

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        public SERVICE_STATUS_PROCESS() {
        }
    
        public SERVICE_STATUS_PROCESS(int size) {
            super(new Memory(size));
        }

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         *  Unicode string.
         */
        public String getString() {
            byte[] data = Buffer.getByteArray(0, Length);
            if (data.length < 2 || data[data.length - 1] != 0) {
                Memory newdata = new Memory(data.length + 2);
                newdata.write(0, data, 0, data.length);
                return newdata.getWideString(0);
            }
            return Buffer.getWideString(0);
        }

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        public TOKEN_OWNER() {
            super();
        }


        public TOKEN_OWNER(int size) {
            super(new Memory(size));
        }

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        public PSID() {
            super();
        }


        public PSID(byte[] data) {
            super(new Memory(data.length));
            getPointer().write(0, data, 0, data.length);
            read();
        }

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            getPointer().write(0, data, 0, data.length);
            read();
        }


        public PSID(int size) {
            super(new Memory(size));
        }

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      HANDLE hFile = Kernel32.INSTANCE.CreateFile(tmp.getAbsolutePath(), WinNT.GENERIC_READ, WinNT.FILE_SHARE_READ,
          new WinBase.SECURITY_ATTRIBUTES(), WinNT.OPEN_EXISTING, WinNT.FILE_ATTRIBUTE_NORMAL, null);
      assertFalse(hFile == WinBase.INVALID_HANDLE_VALUE);


      Memory m = new Memory(2048);
      IntByReference lpNumberOfBytesRead = new IntByReference(0);
      assertTrue(Kernel32.INSTANCE.ReadFile(hFile, m, (int) m.size(), lpNumberOfBytesRead, null));
      int read = lpNumberOfBytesRead.getValue();
      assertEquals(expected.length(), read);
      assertEquals(expected, new String(m.getByteArray(0, read)));


      assertTrue(Kernel32.INSTANCE.CloseHandle(hFile));
    }

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            super(memory);
            read();
        }


        public TOKEN_USER(int size) {
            super(new Memory(size));
        }

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