private boolean ensureConnected() {
if (pipeHandle != WinNT.INVALID_HANDLE_VALUE) return true;
int retryCount = 5;
while (pipeHandle == WinNT.INVALID_HANDLE_VALUE) {
pipeHandle =
kernel32.CreateFile(
"\\\\.\\pipe\\pmb.quik.pipe",
Kernel32.GENERIC_READ | Kernel32.GENERIC_WRITE,
0,
null,
Kernel32.OPEN_EXISTING,
0,
null);
int errorCode = kernel32.GetLastError();
if (errorCode == 2 || errorCode == 231) { // трубы нет или занята
forceDisconnect();
if (--retryCount < 0) {
// System.out.println(errorCode);
return false;
}
}
}
// System.out.println("Готово!");
// System.out.println(kernel32.GetLastError());
if (kernel32.GetLastError() != Kernel32.ERROR_SUCCESS) {
forceDisconnect();
return false;
}
return true;
}
public String executeRequest(String command, boolean doCloseConnection) {
try {
// System.out.println("Соединяемся");
if (ensureConnected()) {
// String command = "stm";//"isc";//"staEQBREMU:SBER03";
WinBase.OVERLAPPED overlapped = new WinBase.OVERLAPPED();
ByteBuffer commandBytes = ByteBuffer.allocate(command.length() + 1);
commandBytes.put(command.getBytes()).put((byte) 0);
kernel32.WriteFile(
pipeHandle,
commandBytes.array(),
commandBytes.capacity(),
new IntByReference(),
overlapped);
// System.out.println(kernel32.GetLastError());
kernel32.FlushFileBuffers(pipeHandle);
// System.out.println(kernel32.GetLastError());
while (overlapped.Internal.intValue() == WinNT.ERROR_IO_PENDING) ;
// System.out.println("Записали");
ByteBuffer buffer = ByteBuffer.allocate(4 * 1024);
IntByReference bytesRead = new IntByReference(buffer.capacity());
int lastError = 0;
// System.out.println("Начали читать..");
// проверим, чтобы не зависнуть
if (kernel32.PeekNamedPipe(pipeHandle, buffer, buffer.capacity(), bytesRead, null, null))
while (!(kernel32.ReadFile(pipeHandle, buffer, buffer.capacity(), bytesRead, overlapped))
|| (lastError = kernel32.GetLastError()) == Kernel32.ERROR_MORE_DATA) {
// читаем и читаем
if (lastError == Kernel32.ERROR_PIPE_NOT_CONNECTED
|| overlapped.Internal.intValue() != WinNT.ERROR_IO_PENDING) break;
}
// System.out.println("Считали: " + bytesRead.getValue() + " байт");
if (doCloseConnection) {
forceDisconnect();
}
String result = new String(buffer.array(), 0, bytesRead.getValue());
// System.out.println("Quik pipe -> : " + result);
if ("not connected".equals(result)) return null;
return result;
} else {
// System.out.println("Quik Pipe cоединение не может быть установлено. Вероятно сервер
// выключен");
return null;
}
} finally {
if (doCloseConnection) {
forceDisconnect();
}
}
}
private void forceDisconnect() {
if (pipeHandle != WinNT.INVALID_HANDLE_VALUE) {
kernel32.CloseHandle(pipeHandle);
pipeHandle = WinNT.INVALID_HANDLE_VALUE;
// System.out.println("Закрыли трубу!");
}
}