How to invoke non external functions from c++ programs

[prashantbasvat]

Hi,
Is there any way to invoke structure text functions (non external) directly from c++ code.
Here is my code

function.st
FUNCTION SET_VALUE : BOOL
VAR_IN_OUT
INPUTVAR : DINT ;
END_VAR

VAR_INPUT
VALUE : DINT;
END_VAR
INPUTVAR := VALUE
SET_DINTS := TRUE;
END_FUNCTION

main.cpp
#include
extern "C" bool SET_VALUE (int32_t*, int32_t);

int main()
{
int32_t inputVar = 0;
int32_t value = 42;
bool result = SET_VALUE (&inputVar , value);
printf("inputVar : %d \n", inputVar);
return 0;
}

Need to know how to build code?????????

[ghaith]

hi @prashantbasvat
You need to compile both files into objects and then link them together.
The easiest way to do this is like this:

1. Compile the PLC application into an object plc -c function.st -o function.o (you might need to add --pic as well the c++ compiler will tell you if you need it)
2. Compile the C++ application, and include the PLC compiled application as an object g++ main.cpp function.o -o main
   This should be all you need.