opc connection

OSIsoft pi opc da Interface Remote Stack Buffer Overflow Vulnerability Release date:Updated on: Affected Systems:Osisoft pi opc da Interface Description:--------------------------------------------------------------------------------Bugtraq id: 54609Cve id: CVE-2012-3008 Pi opc da Interface can be used to transmit data in the

In fact, very early plan to do in the Lazarus inside, or in the actual application of time too tight need to use the OPC of the program with Delphi change, also used. After the FPC3.0 also after lazarus1.6, its core to UTF8 comprehensive support, led to Delphi many procedures can not directly transferred to Lazarus inside. Knowing undeterred, OPC inside will use a lot of Pwidechar and olevariant this is dif

This time only under WIN7 test success, in WinXP and winserver2008 are not successful, it is recommended to install the system when the choice of win7_32-bit operating system.Siemens Insight OPC Configuration tutorialIf you do not have permission to configure OPC, this screen will appearThe correct display should appear when the configuration is complete.Configuration steps:1. Local Security policy settings

All functions as the APMC configuration 1, the greatest flexibility of the software is, support UserControl, others do UserControl can be added to the configuration of 2, super-strong editing function, can be arbitrarily copied, sticky 3,FBD advanced control function 4,OPC drive by calling the OPC Foundation Opcdaauto.dll for data collection links, _ Currently can connect 1.0 and 2.0, but 2.0 data items not

A C # program written using the OPC Automation interface is running on a new machine with the following error:The component for the CLSID {28e68f9a-8d75-11d1-8dc3-3c302a000000} in the cable COM class factory failed because of the following error: 80040154 no registered Class (Exception from hresult:0x80040154 (REGDB _e_classnotreg)).Running successfully on my notebook, the registry search is as follows:The following is the interface. NET Source:namesp

Minchen OPC server core application 1.0 download: Download, details: /* Drop table [deviceevent] */ Drop table if exists [deviceevent]; /* Device events, mainly for sending messages to devices, which will be deleted after being sent */Create Table [deviceevent] ([DeviceID] bigint not null,[Devicevalue] varchar (255) not null,Constraint [sqlite_autoindex_deviceevent_1] primary key ([DeviceID]); /* Data [deviceevent] */ /* Drop table [deviceinfo] *

Create the following form: The reference is as follows: The code is as follows: Option Explicit Dim WithEvents ServerObj as Opcserver Dim WithEvents Groupobj as Opcgroup Dim Itemobj as Opcitem Private Sub Command_start_click () Dim Outtext as String On Error GoTo ErrorHandler command_start.enabled = False command_read.enabled = True command_write.enabled = True command_exit.enabled = True Outtext = "Connect OPC server" Set ServerObj = New opcser

Create the following form: Reference:The Code is as follows:Option ExplicitDim WithEvents ServerObj As OPCServerDim WithEvents GroupObj As OPCGroupDim ItemObj As OPCItemPrivate Sub Command_Start_Click ()Dim OutText As String On Error GoTo ErrorHandler Command_Start.Enabled = FalseCommand_Read.Enabled = TrueCommand_Write.Enabled = TrueCommand_Exit.Enabled = TrueOutText = "connecting to OPC server"Set ServerObj = New OPCServerServerObj. Connect ("XXXSER

The program establishes the following form: The reference is as follows: The code is as follows: Option Explicit Dim WithEvents ServerObj as Opcserver Dim WithEvents Groupobj as Opcgroup Dim Itemobj as Opcitem Private Sub Command_start_click () Dim Outtext as String On Error GoTo ErrorHandler command_start.enabled = False command_read.enabled = True command_write.enabled = True command_exit.enabled = True Outtext = "Connect OPC server" Set

Lazarus is now a very good editing environment, code hints and formatting functions can work better. Can even think of editing and editing part of the function is better than Delphi, but after all, the small crowd is not complete.Lazarus Development DLL with Delphi as convenient, but in the compilation process may appear in Delphi never encountered problems, reported "Xxxxxx.pas (22,1) error:undefined symbol:wsregisterxxxxxx "Information such as:The solution is to add "Interfaces" in the Applica

When developing with OPC client, you need to pay attention to memory leakage from the following aspects: (1) All returned pointers must be released with cotaskmemfree, for example: [Delphi] view plaincopyFunction group_tryadditems (agroupintf: iopcitemmgt; aitemcount: integer; aitems: popcitemdefarray): popcitemresultarray;VaRVerrors: presultlist;BeginResult: = nil;Verrors: = nil;If agroupintf. additems (aitemcount, psafearray (aitems), result, ve

On a machine equipped with an OPC server. DCOM is configured as follows1. Run the DCOMCNFG program on the server for DCOM configuration.2. Go to the overall default properties page of DCOM and tick "enable distributed COM on this computer" to change the default identity level to "none".3. Go to DCOM's overall default security page to confirm that default access and default boot permissions do not have everyone in the default values.If you do not remov

Program | Creates the following form asynchronously: The reference is as follows: The code is as follows: Option Explicit Option Base 1 Const writeasync_id = 1 Const readasync_id = 2 Const refreshasync_id = 3 '---------------------------------------------------------------------------- ' Interface Objects '---------------------------------------------------------------------------- Public WithEvents ServerObj as Opcserver Public WithEvents Groupobj as Opcgroup Dim ItemObj1 as Opcitem Di

Left JOIN and right connections:Left JOIN: The query is based on left table, the left table data are all displayed, the right table shows all the data matching the left table, the mismatch is shown as nullRight connection (opposite to left join): the right table as the benchmark for the query, the right table data are all displayed, the left table and the right table matches the data are all displayed, the mismatch is displayed as nullFull

Recently, the company is recruiting people. My colleagues asked a few questions about database connection that I think the database can be applied ~ Now I want to write about their functions here. Assume that the following table is used: One is the voting master table, and the other is the voter information table ~ Record the IP address of the voter and the corresponding voting type. The left-right connection