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Compile with multiple libraries

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24 Nov 2022 15:58 #11238 by federica
Replied by federica on topic Compile with multiple libraries
Thank you very much for your answer.

I changed my code following your suggestion:
[...]
// OpcLabs.BaseLib
//#if _MSC_VER >= 1300
//#define IMPORT_OPCLABS_BASELIB "libid:ecf2e77d-3a90-4fb8-b0e2-f529f0cae9c9"
//#else
#define IMPORT_OPCLABS_BASELIB	"OpcLabs.BaseLib.tlb"
//#endif
#import IMPORT_OPCLABS_BASELIB version("5.3f")  \
rename("value", "Value") \
rename("password", "Password")
using namespace OpcLabs_BaseLib;
[...]

Thanks
Federica

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24 Nov 2022 14:26 #11237 by support
Replied by support on topic Compile with multiple libraries
Hello.

I am sure you are aware that for run-time COM apps, multiple QuickOPC version cannot coexist in the same computer.

For COM development-time, we do not support it either, but in some cases - and when you know what you are doing - it might possible.
Since QuickOPC reuses the same IIDs, CLSIDs and also TLBIDs, you need to make sure you are importing the right type library. So, if you can assure that the file that will be found by the compiler for the #import directive is of the right version, I think your approach may work - although I have not tried it.

Also note that the #import directive has an optional "version" attribute, which might be another way to go: learn.microsoft.com/en-us/cpp/preprocessor/hash-import-directive-cpp?view=msvc-170 .

Regards
The following user(s) said Thank You: federica

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24 Nov 2022 07:47 #11234 by federica
Compile with multiple libraries was created by federica
Hi,

I'm using QuickOPC COM, developing in C++.

I need to compile my project with multiple versions of QuickOPC libraries in order to distruibute my projects with backward compatibility.

I created separate projects using Visual Studio and I installed multiple libraries on the machine where I will compile.

I also edited "Quickopc.h" file in order to directly reference tlb files.
For example:
[...]
// OpcLabs.BaseLib
//#if _MSC_VER >= 1300
//#define IMPORT_OPCLABS_BASELIB	"libid:ecf2e77d-3a90-4fb8-b0e2-f529f0cae9c9"
//#else
#define IMPORT_OPCLABS_BASELIB	"OpcLabs.BaseLib.tlb"
//#endif
#import IMPORT_OPCLABS_BASELIB \
	rename("value", "Value") \
  rename("password", "Password")
using namespace OpcLabs_BaseLib;
[...]

Do you see any downside doing this?
Or do you think I should do something else?

Thanks,
Federica

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Moderators: support
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  5. QuickOPC-Classic in COM
  7. General Issues, Building
  9. Compile with multiple libraries
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