Hello,

I’m trying to use the TuaServer in a 64bit C++ application and I run into linker issues. I created a new VCL Forms application, dragged the TUaServer Component onto the form and compiled. Compilation succeeded, but the linker issued a lot of mostly unreolved externals. After I added these lines

#pragma link “ssleay32.lib”
#pragma link “libeay32.lib”
#pragma link “uastack_32.lib”
#pragma link “prosysopc.uaserver290.lib”

the linker was able to link correctly.

Then I switched from 32bit to 64bit and changed the linker instructions to

#pragma link “ssleay32.a”
#pragma link “libeay32.a”
#pragma link “uastack_32.a”
#pragma link “prosysopc.uaserver290.a”

and the linker was unable to find any of those files. I checked the lib290x64 folder and these file were indeed missing. I created the .a files from the corresponding DLLs using Embarcaderos mkexp tool, but I have no clue what file to link for the 64bit versions of TUaServer. So I tried

#pragma comment (lib, “ssleay32” )
#pragma comment (lib, “libeay32” )
#pragma comment (lib, “ustack_32” )
#pragma comment (lib, “prosysopc.uaserver290” )

to make the linker choose which files to link, but it didn’t fix the issues, I still get the linker error “Unable to open file prosysopc.uaserver.o”.
What can I do to resolve this?

I am using the classic 64bit C++ compiler, which should be fine as you state in the install.txt file.

Windows 11 64bit Professional
RAD Studio 12.1 (Delphi 12 and C++ Builder 12 Update 1, RAD Studio 12.1 Patch 1)
Prosys OPC SDK 7.8.0 for Athens 12

Kind regards,
Guidoi