LabVIEW
Calling C++ DLL to labview
reddy wrote:
> Iam having a DLL written in C++.I would like to know how to call
> this C++ DLL to labview.I have seen CALL LIBRARY FUNCTION, but
> there is no calling convention for C++.
There exists no specific calling convention for C++ at all. Functions
are exported as __cdecl and under Windows also often __stdcall just as
normal C functions.
> Is there any other method to call C++ DLL to labview.
If you talk about export of C++ object interfaces, there is no common
convention about the memory layout of those interfaces nor their name
mangling conventions and consequently you can't really link C++
libraries created in one compiler into a project from a different
compiler. Because of this LabVIEW never has made an attempt to try to
provide an interface to C++ object interface pointers at all. DLLs also
do not provide a defined convention to export entire C++ object
interfaces other than exporting the individual object methods as normal
functions.
Alternatively under Windwos 32 bit, DLLs can implement Active X objects
which do have a formalized and strictly standardized interface to their
methods and attributes.
Rolf Kalbermatter
> Iam having a DLL written in C++.I would like to know how to call
> this C++ DLL to labview.I have seen CALL LIBRARY FUNCTION, but
> there is no calling convention for C++.
There exists no specific calling convention for C++ at all. Functions
are exported as __cdecl and under Windows also often __stdcall just as
normal C functions.
> Is there any other method to call C++ DLL to labview.
If you talk about export of C++ object interfaces, there is no common
convention about the memory layout of those interfaces nor their name
mangling conventions and consequently you can't really link C++
libraries created in one compiler into a project from a different
compiler. Because of this LabVIEW never has made an attempt to try to
provide an interface to C++ object interface pointers at all. DLLs also
do not provide a defined convention to export entire C++ object
interfaces other than exporting the individual object methods as normal
functions.
Alternatively under Windwos 32 bit, DLLs can implement Active X objects
which do have a formalized and strictly standardized interface to their
methods and attributes.
Rolf Kalbermatter
