dOPC Client Toolkit
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dOPC FAQ's
How can I debug into the dOPC source code?
To debug into the dOPC source you have to set the path to the dOPC source code in the Delphi/C++ IDE. To set the path you have to do following steps:
  1. Start Delphi/RAD Studio IDE
  2. Open menu "Tools/Options/Environment Options/Delphi options/Library"
  3. Now add following dOPC folders under section "Library Path": $(dOPC)\core;$(dOPC)\ua;$(dOPC)\xml;$(dOPC)\com;$(dOPC)\dialogs
4. You have to do step 3 for every platform you want to debug.

Another possibility is to run the dOPCDebugOn.cms script with the dCompile program. You will find the script, the program as well as a readme file in the ../tools/dcompile folder.

Please note:
Debugging will only work if you have the registered (with source code) dOPC Client Toolkit version installed in a writeable folder. If not please uninstall the toolkit from the Windows control panel and install it again to a writeable folder.
How do I create 64 bit OPC client applications
Very important: To run OPC COM 64-bit client programs you have first to download and install the 64-bit OPC Core Components 3.00 Redistributable (x64) from the OPC Foundation. (a free registration is required) https://www.opcfoundation.org

Also you have to recompile the dOPC Client Tookit. Please look to section below: "How can I create a dOPC applications for other platforms"
That's normally all you have to do. Now you can create a 64 bit dOPC application. For further information about 64 bit application development look at your Delphi help file.
Please note: Currently it is not possible to create 64 bit application for C++ Builder .
Is it possible to connect to remote OPC COM servers with dOPC?

dOPC supports connections to remote OPC servers, but you need to configure DCOM on both client and server beforehand. For further information please look at section: dOPC and DCOM
Which OPC components do I have to distribute with my client program developed with dOPC?
OPC XML DA clients:
If you use OPC XML DA as communication layer you only need to distribute your EXE file.

OPC UA clients:
If you use OPC UA as communication layer and you don't use security you only need to distribute your EXE file. If you use security or authentication you have additionally to distribute following DLL's from the OpenSSL Library:
<!! ssleay32.dll and libeay32.dll !!>
You will find the versions we used in the dOPC installation folder under the path "tools".

OPC Classic COM based clients:
If you run the program you developed on the same PC the OPC server is running on (local access), you also only need to distribute your EXE file, because usually all required OPC components have been installed by the OPC server.

If your client program does not run on the same PC the OPC COM server is running on (remote access), you have to configure DCOM and you need to install the OPC Core Components. You can download the "OPC Core Components" installation program at the OPC Foundation (Resources/Sample and Tools/Classic). The direct link is https://opcfoundation.org/developer-tools/samples-and-tools-classic.
Do I have to purchase any runtime licenses when I distribute my program developed with dOPC?
No, the dOPC Client Toolkit is licensed per developer and includes an unlimited runtime license (royalty-free runtime distribution). See also licence agreement
Is it possible to call OPC UA services with the TdOPCDAClient component?
Yes, the TdOPCDAClient component uses internally the TdOPCUAClient component. How to do it please: click here
How can I add a OPC UA NodeId to a dOPC group.
How to do it please: click here
How can I recompile the dOPC Client Toolkit
If you want to recompile the dOPC Client Toolkit, because e.g if the dOPC installation says that you don't have the right compiler version, then you have to do following steps.
1. Install the dOPC Client Toolkit on your computer to a writeable folder.
2. Open Delphi IDE
3. Now open packages file dOPCP.dproj from the "..\source\package" folder.
4. In the project Manager make a right click on dOPC.bpl and "Build" and "Install" the toolkit.
5. That's normally all, now it should work with your Delphi compiler version.

Please note:
This procedure works only with the registered source code version of dOPC.
Also it is very important to install dOPC to a writeable folder
elsewhere you can't compile the toolkit. If you have installed the toolkit in
a none writeable folder, please use the Windows Control Panel to remove
the toolkit and install it again into a writeable folder.
How can install the dOPC Client Toolkit manually.
If you want to compile the dOPC Client Toolkit on a new released Delphi version, which is not listed in dOPC installation, then you have to do following steps:
1. Install the dOPC Client Toolkit on your computer to a writeable folder.
2. Open Delphi IDE
3. Open in Delphi menu Tools->Options Tab: Environment Variables
4. Under "User System Overrides" add following items with button "New".
Variable name Variable Value Example
dOPCRoot dOPC Installation folder c:\dopc
dOPC Folder to the source c:\dopc\source
dOPCLib Delphi Package Version 270 (Delphi 10.4.2 Sydney)
5. Now open packages file dOPCP.dproj from the "..\source\package" folder.
6. In the Delphi project manager make a right click on dOPC.bpl and "Build" and "Install" the toolkit.
7. That's normally all, now dOPC should work under the new Delphi version.f you want to compile the dOPC Client Toolkit on a new released Delphi version,
which is not listed in dOPC installation, then you have to do following steps.

Please note:
This procedure works only with the registered source code version of dOPC. Also it is very important to install dOPC to a writeable folder
elsewhere you can't compile the toolkit. If you have installed the toolkit in a none writeable folder, please use the Windows Control Panel to remove the toolkit and install it again into a writeable folder.
How can I create a dOPC application for other platforms (e.g. Android and iOS)
Attention:
Following description will only work if you have the installed the registered dOPC Client Toolkit version in a writeable folder. If not please uninstall the toolkit from the Windows control panel and install it again to a writeable folder.

If you want to create dOPC applications for other platforms than Windows you have first to recompile the dOPC Client Toolkit. In order to do this please carry out the following steps:

1. Close your Delphi or C++ IDE and start program dCompile.exe
You will find this program by default in the dOPC installation folder under: "..\tools\dcompile".

2. Open script file "dOPCCompileAll.cms"
With the help of this script the dOPC Client Toolkit will be complied for following platforms:
Windows 32 bit, Windows 64 Bit, Android, Mac OS and iOS
In program "dcompile" click in main menu: "File->Load" to open the script file.
You will find the script file in the dOPC installation folder under: "..\tools\dcompile".
Press button "Run Script"
The program should return with "building succesfully :-)"

Now you can open the Delphi or C++ Builder IDE. For further information about multi platform developing please look to the Delphi or C++ Builder documentations.

You will find multi platform OPC client programs (e.g. the dOPC Mobile Explorer) at:
http://www.kassl.de/opc/download.shtml

For Android, iOS and MAC OS it is only possible to create OPC UA and XML DA client programs.

If you want to use OPC XML DA and your OPC server does not support OPC XML DA you can use our dOPC XGate to enlarge any classic OPC server with an OPC XML-DA interface. You will find dOPC XGate as trial version under the "tools" folder, or you can download the newest version at: http://www.kassl.de/opc/opc-server-gateway.shtml
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