item.cpp

VisualC OPC Client Example C 程序开发

							// Append the formatted element data:
							strValue += szNum;

							// Terminate each row (except the last):
							if (++dwCol == dwCols)
								{
								if (i < dwSize - cbElements) 
									strValue += _T(" ] [ ");

								dwCol = 0;
								}
							}

						// End delimiter:
						strValue += _T(" ]");
						}

					// Else bad array data:
					else
						{
						strValue = _T("???");
						LogMsg (IDS_BADITEMARRAYDATA, GetItemID ());
						}
					}
					break;

				default:
					strValue = cStringContainer.m_lpszUnknown;
					break;
				}
			}
		
		// Else if data item is not an array:
		else
			{
			// Format output string according to data type:
			switch (m_vtValue.vt)
				{
				case VT_BOOL:
					wsprintf (szNum, _T("%d"), m_vtValue.boolVal ? 1 : 0);
					break;

				case VT_UI1:
					wsprintf (szNum, _T("%u"), m_vtValue.bVal);
					break;

				case VT_I1:
					wsprintf (szNum, _T("%d"), m_vtValue.cVal);
					break;

				case VT_UI2:
					wsprintf (szNum, _T("%u"), m_vtValue.uiVal);
					break;

				case VT_I2:
					wsprintf (szNum, _T("%d"), m_vtValue.iVal);
					break;

				case VT_UI4:
					wsprintf (szNum, _T("%u"), m_vtValue.ulVal);
					break;

				case VT_I4:
					wsprintf (szNum, _T("%d"), m_vtValue.lVal);
					break;

				case VT_R4:
					_stprintf (szNum, _T("%G"), m_vtValue.fltVal);
					break;

				case VT_R8:
					_stprintf (szNum, _T("%G"), m_vtValue.dblVal);
					break;

				case VT_BSTR:
					strValue = m_vtValue.bstrVal;
					return;

				default:
					strValue = cStringContainer.m_lpszUnknown;
					return;
				}

			strValue = szNum;
			}
		}

	// Else if item is inactive and/or invalid set value accordingly:
	else
		{
		strValue = cStringContainer.m_lpszUnknown;
		}
	}

// **************************************************************************
// GetQuality ()
//
// Description:
//	Returns a string representation of the current quality.
//
// Parameters:
//  none
//
// Returns:
//  LPCTSTR	- Pointer to quality string.
// **************************************************************************
LPCTSTR CKItem::GetQuality ()
	{
	// Create a CSafeLock to make this object thread safe.  Our critical
	// section gets locked here, and will automatically be unlocked when the
	// CSafeLock goes out of scope.
	CSafeLock cs (&m_csDataLock);

	// If item is active an valid, we can rely on server's data:
	if (IsValid ())
		{
		// Quality bits arranged QQSSSLL (each letter a bit).

		// Parse quality bits (omit limit bits) and output appropriate string:
		switch (m_wQuality & 0xFC)
			{
			case OPC_QUALITY_BAD_NON_SPECIFIC:
				return (cStringContainer.m_lpszQualityBad);

			case OPC_QUALITY_BAD_CONFIG_ERR0R:
				return (cStringContainer.m_lpszQualityBadConfigError);

			case OPC_QUALITY_BAD_NOT_CONNECTED:
				return (cStringContainer.m_lpszQualityBadNotConnected);

			case OPC_QUALITY_BAD_DEVICE_FAILURE:
				return (cStringContainer.m_lpszQualityBadDeviceFailure);

			case OPC_QUALITY_BAD_SENSOR_FAILURE:
				return (cStringContainer.m_lpszQualityBadSensorFailure);

			case OPC_QUALITY_BAD_LAST_KNOWN_VALUE:
				return (cStringContainer.m_lpszQualityBadLastKnownValue);

			case OPC_QUALITY_BAD_COMM_FAILURE:
				return (cStringContainer.m_lpszQualityBadCommFailure);

			case OPC_QUALITY_BAD_OUT_OF_SERVICE:
				return (cStringContainer.m_lpszQualityBadOutOfService);

			case OPC_QUALITY_UNCERTAIN_NON_SPECIFIC:
				return (cStringContainer.m_lpszQualityUncertain);

			case OPC_QUALITY_UNCERTAIN_LAST_USABLE_VALUE:
				return (cStringContainer.m_lpszQualityUncertainLastUsableValue);

			case OPC_QUALITY_UNCERTAIN_SENSOR_NOT_ACCURATE:
				return (cStringContainer.m_lpszQualityUncertainSensorNotAccurate);

			case OPC_QUALITY_UNCERTAIN_EU_UNITS_EXCEEDED:
				return (cStringContainer.m_lpszQualityUncertainEUExceeded);

			case OPC_QUALITY_UNCERTAIN_SUB_NORMAL:
				return (cStringContainer.m_lpszQualityUncertainSubnormal);

			case OPC_QUALITY_GOOD_NON_SPECIFIC:
				return (cStringContainer.m_lpszQualityGood);

			case OPC_QUALITY_GOOD_LOCAL_OVERRIDE:
				return (cStringContainer.m_lpszQualityGoodLocalOverride);

			default:
				return (cStringContainer.m_lpszQualityNoValue);
			}
		}

	// If we make it here, then item is invalid.  Return appropriate string:
	return (cStringContainer.m_lpszQualityNoValue);
	}

// **************************************************************************
// GetTimeStamp ()
//
// Description:
//	Returns a string representation of the current timestamp.
//
// Parameters:
//  CString		&strTimeStamp	Output string.
//
// Returns:
//  void
// **************************************************************************
void CKItem::GetTimeStamp (CString &strTimeStamp)
	{
	// Create a CSafeLock to make this object thread safe.  Our critical
	// section gets locked here, and will automatically be unlocked when the
	// CSafeLock goes out of scope.
	CSafeLock cs (&m_csDataLock);

	// Output timestamp if we are infact timestamped:
	if (m_bTimeStamped)
		{
		FILETIME ftLocal;

		// Convert raw timestamp from file time to local file time.
		// Proceed with next step in conversion only if successful.
		if (FileTimeToLocalFileTime (&m_ftTimeStamp, &ftLocal))
			{
			SYSTEMTIME systime;
			TCHAR szTime [64];

			// Convert file time to system time:
			if (FileTimeToSystemTime (&ftLocal, &systime))
				{
				// Format system time string:
				wsprintf (szTime, _T("%02d:%02d:%02d:%03d"), 
					systime.wHour, systime.wMinute, systime.wSecond, systime.wMilliseconds);			
				
				// Assign formatted system time string to output string:
				strTimeStamp = szTime;
				}
			
			// Conversion failed:
			else
				{
				ASSERT (FALSE);
				}
			}

		// Conversion failed:
		else
			{
			ASSERT (FALSE);
			}
		}

	// Else we are not timestamped so set timestamp to non-applicable:
	else
		strTimeStamp = cStringContainer.m_lpszNonApplicable;
	}

// **************************************************************************
// GetUpdateCount ()
//
// Description:
//	Returns the number of updates the item has recieved.
//
// Parameters:
//  none
//
// Returns:
//  DWORD - Current update count.
// **************************************************************************
DWORD CKItem::GetUpdateCount ()
	{
	// Create a CSafeLock to make this object thread safe.  Our critical
	// section gets locked here, and will automatically be unlocked when the
	// CSafeLock goes out of scope.
	CSafeLock cs (&m_csDataLock);

	// Return current update count:
	return (m_cdwUpdates);
	}


/////////////////////////////////////////////////////////////////////////////
// CKItem serialization
/////////////////////////////////////////////////////////////////////////////

// **************************************************************************
// Serialize ()
//
// Description:
//	Save or load item settings.
//
// Parameters:
//  CArchive		&ar			The archive to save or load item settings.
//
// Returns:
//  void
// **************************************************************************
void CKItem::Serialize (CArchive &ar)
	{
	// Saving object information:
	if (ar.IsStoring ())
		{
		// Save verion first so we will know how to read information later.
		// If format of data needs to change at some point, say we need
		// to add another property, then bump up the version number.
		ar << CURRENT_VERSION;						// current version

		// Save item access path:
		ar << m_strAccessPath;

		// Save full qualified item ID:
		ar << m_strItemID;

		// Save item active state:
		ar << m_bActive;

		// Save item data type:
		ar << m_vtDataType;

		// Save item access rights:
		ar << m_dwAccessRights;

		// Save flag bit field (we can add flags, for up to a total of 32 in
		// this case, without having to change version):
		ar.Write (&m_bfFlags, sizeof (m_bfFlags));
		}

	// Else loading object information:
	else
		{
		// Read version of saved information:
		DWORD dwSchema;
		ar >> dwSchema;

		// Read data according to version:
		switch (dwSchema)
			{
			case VERSION_1:
				ar >> m_strAccessPath;						// access path
				ar >> m_strItemID;							// fully qualified item ID
				ar >> m_bActive;							// active state
				ar >> m_vtDataType;							// data type
				ar >> m_dwAccessRights;						// access rights
				ar.Read (&m_bfFlags, sizeof (m_bfFlags));	// flags
				break;

			default:
				// Unexpected version.  Self-delete and throw achive exception:
				delete this;
				AfxThrowArchiveException (CArchiveException::badSchema);
				break;
			}
		}
	}

// **************************************************************************
// Copy ()
//
// Description:
//	Copy an instance of this class.  (Save properties to a shared memory file.)
//
// Parameters:
//  CFixedSharedFile	&sf		Shared memory file to copy properties to.
//
// Returns:
//  void
// **************************************************************************
void CKItem::Copy (CFixedSharedFile &sf)
	{
	int nLen;

	// To save a string to a shared memory file, we need to first save the
	// string length.  (CArchive objects, as in Serialize(), has this logic
	// built in.)

	// Save access path string:
	nLen = m_strAccessPath.GetLength ();
	sf.Write (&nLen, sizeof (nLen));
	sf.Write (m_strAccessPath, nLen * sizeof (TCHAR));

	// Save item ID string:
	nLen = m_strItemID.GetLength ();
	sf.Write (&nLen, sizeof (nLen));
	sf.Write (m_strItemID, nLen * sizeof (TCHAR));

	// Save active state:
	sf.Write (&m_bActive, sizeof (m_bActive));

	// Save data type:
	sf.Write (&m_vtDataType, sizeof (m_vtDataType));

	// Save access rights:
	sf.Write (&m_dwAccessRights, sizeof (m_dwAccessRights));

	// Save flag bit field:
	sf.Write (&m_bfFlags, sizeof (m_bfFlags));
	}

// **************************************************************************
// Paste ()
//
// Description:
//	Paste an instance of this class.  (Load properties from a shared memory file.)
//
// Parameters:
//  CFixedSharedFile	&sf		Shared memory file to paste properties from.
//
// Returns:
//  void
// **************************************************************************
void CKItem::Paste (CFixedSharedFile &sf)
	{
	int nLen;

	// To save a string to a shared memory file, we need to first save the
	// string length.  (CArchive objects, as in Serialize(), has this logic
	// built in.)  So to read the string back, we read its length first:

	// Read access path string:
	sf.Read (&nLen, sizeof (nLen));
	sf.Read (m_strAccessPath.GetBufferSetLength (nLen), nLen * sizeof (TCHAR));

	// Read item ID string:
	sf.Read (&nLen, sizeof (nLen));
	sf.Read (m_strItemID.GetBufferSetLength (nLen), nLen * sizeof (TCHAR));

	// Read active state:
	sf.Read (&m_bActive, sizeof (m_bActive));

	// Read data type:
	sf.Read (&m_vtDataType, sizeof (m_vtDataType));

	// Read access rights:
	sf.Read (&m_dwAccessRights, sizeof (m_dwAccessRights));

	// Read flag bit field:
	sf.Read (&m_bfFlags, sizeof (m_bfFlags));
	}