com.sun.jna.platform.win32.Kernel32Util Java Examples

public static void msync(RandomAccessFile raf, long addr, long length)
        throws IOException {
    int retry = 0;
    boolean success;
    int lastError = 0;
    // FlushViewOfFile can fail with ERROR_LOCK_VIOLATION if the memory system is writing dirty
    // pages to disk. As there is no way to synchronize the flushing then we retry a limited
    // number of times.
    do {
        success = KERNEL_32.FlushViewOfFile(new Pointer(addr), new SIZE_T(length));
        if (success || (lastError = KERNEL_32.GetLastError()) != ERROR_LOCK_VIOLATION)
            break;
        retry++;
    } while (retry < 3);

    if (success) {
        // Finally calls FlushFileBuffers
        raf.getChannel().force(false);
    } else {
        throw new IOException(Kernel32Util.formatMessageFromLastErrorCode(lastError));
    }
}
 

/**
 * Constructor that allows injection of JNA interfaces
 *
 * @param wEvtApi  event api interface
 * @param kernel32 kernel interface
 */
public ConsumeWindowsEventLog(WEvtApi wEvtApi, Kernel32 kernel32) {
    this.wEvtApi = wEvtApi == null ? loadWEvtApi() : wEvtApi;
    this.kernel32 = kernel32 == null ? loadKernel32() : kernel32;
    this.errorLookup = new ErrorLookup(this.kernel32);
    if (this.kernel32 != null) {
        name = Kernel32Util.getComputerName();
    } else {
        // Won't be able to use the processor anyway because native libraries didn't load
        name = null;
    }
}
 

/**
 * Enter a text by sending input events through the Windows API via JNA.
 *
 * @param text text to send through the Windows API
 * @throws WindowsException if the User32 library is not available or no events were processed
 * @see <a href="https://docs.microsoft.com/en-us/windows/desktop/api/winuser/nf-winuser-sendinput">SendInput function</a>
 * @see <a href="https://stackoverflow.com/a/22308727">Using SendInput to send unicode characters beyond U+FFFF</a>
 */
private static void sendTextViaUser32(String text) throws WindowsException {
    if (StringUtils.isEmpty(text))
        return;
    if (USER32 == null)
        throw new WindowsException("User32 library was not loaded.");

    //final List<Long> pointers = new ArrayList<>();
    //noinspection EmptyFinallyBlock
    try {
        final List<WinUser.INPUT> events = new ArrayList<>();
        for (int i = 0; i < text.length(); i++) {
            final char c = text.charAt(i);
            //LOGGER.debug("printing " + c);
            events.add(createKeyboardInput(c, WinUser.KEYBDINPUT.KEYEVENTF_UNICODE));
            events.add(createKeyboardInput(c, WinUser.KEYBDINPUT.KEYEVENTF_KEYUP | WinUser.KEYBDINPUT.KEYEVENTF_UNICODE));
        }
        //for (WinUser.INPUT i : events) {
        //    long address = Pointer.nativeValue(i.getPointer());
        //    if (!pointers.contains(address)) pointers.add(address);
        //}

        WinUser.INPUT[] inputs = events.toArray(new WinUser.INPUT[0]);
        inputs = (WinUser.INPUT[]) inputs[0].toArray(inputs);
        //for (WinUser.INPUT i : inputs) {
        //    long address = Pointer.nativeValue(i.getPointer());
        //    if (!pointers.contains(address)) pointers.add(address);
        //}

        final WinDef.DWORD result = USER32.SendInput(
                new WinDef.DWORD(inputs.length), inputs, inputs[0].size());

        if (result.intValue() < 1) {
            LOGGER.error("last error: {}", Kernel32Util.getLastErrorMessage());
            throw new WindowsException("No events were executed.");
        }
        //LOGGER.debug("result: {}", result.intValue());
    } finally {
        //for (Long address : pointers) {
        //    Kernel32Util.freeLocalMemory(new Pointer(address));
        //}
    }
}
 

public void shutdown() throws SystemException {
    final boolean success = advapi32.InitiateSystemShutdown(
        null,
        null,
        new WinDef.DWORD(0),
        true,
        false
    );
    if (!success) {
        throw new SystemException(Kernel32Util.formatMessage(kernel32.GetLastError()));
    }
}
 

public void reboot() throws SystemException {
    final boolean success = advapi32.InitiateSystemShutdown(
        null,
        null,
        new WinDef.DWORD(0),
        true,
        true
    );
    if (!success) {
        throw new SystemException(Kernel32Util.formatMessage(kernel32.GetLastError()));
    }
}
 

public void suspend() throws SystemException {
    final boolean success = kernel32.SetSystemPowerState(
        true,
        false
    );
    if (!success) {
        throw new SystemException(Kernel32Util.formatMessage(kernel32.GetLastError()));
    }
}
 

public void hibernate() throws SystemException {
    final boolean success = kernel32.SetSystemPowerState(
            false,
            false
        );
    if (!success) {
        throw new SystemException(Kernel32Util.formatMessage(kernel32.GetLastError()));
    }
}
 

private static WinNT.HANDLE getHandleByPid(int pid_) throws IOException {
	WinNT.HANDLE handle = Kernel32.INSTANCE.OpenProcess(0x0400 | // PROCESS_QUERY_INFORMATION
					0x0800 | // PROCESS_SUSPEND_RESUME
					0x0001 | // PROCESS_TERMINATE
					0x0200 | // PROCESS_SET_INFORMATION
					0x00100000, // SYNCHRONIZE
			false, pid_);
	if (handle == null) {
		throw new IOException(
				"OpenProcess failed: " + Kernel32Util.formatMessageFromLastErrorCode(Kernel32.INSTANCE.GetLastError()) + " (pid: " + pid_ + ")");
	}
	return handle;
}
 

/**
 * Constructor that allows injection of JNA interfaces
 *
 * @param wEvtApi  event api interface
 * @param kernel32 kernel interface
 */
public ConsumeWindowsEventLog(WEvtApi wEvtApi, Kernel32 kernel32) {
    this.wEvtApi = wEvtApi == null ? loadWEvtApi() : wEvtApi;
    this.kernel32 = kernel32 == null ? loadKernel32() : kernel32;
    this.errorLookup = new ErrorLookup(this.kernel32);
    if (this.kernel32 != null) {
        name = Kernel32Util.getComputerName();
    } else {
        // Won't be able to use the processor anyway because native libraries didn't load
        name = null;
    }
}
 

public static String getLastError() {
	return Kernel32Util.getLastErrorMessage();
}
 

/**
 * Gets the computer name.
 * 
 * <p>This is the also known as the NetBIOS name, although NetBIOS is 
 * hardly used anymore. It is the same value as can be seen from the
 * {@code COMPUTERNAME} environment variable.
 * 
 * <p>
 * Windows API equivalent: {@code GetComputerName()} function from 
 * {@code Kernel32} library.
 * 
 * @return computer name
 * @throws NativeException if there was an error executing the
 *    system call.
 */
public static String getComputerName() throws NativeException {
    try {
        return Kernel32Util.getComputerName();
    } catch (Win32Exception ex) {
        LOGGER.log(Level.FINE, "Kernel32.GetComputerName error : {0}", ex.getHR().intValue());
        String env = System.getenv("COMPUTERNAME");
        if (env != null) {
            return env;
        }
        throw new NativeException(ex.getHR().intValue(), "error calling 'GetComputerName()' function");
    }
}