eclipse - NI-VISA library programming in C++ - out of scope error -


i trying program rigol ds1054 oscilloscope output waveform data. create program, writing in c++ using code::blocks, have tried on 4 other compilers (netbeans, eclipse mars, eclipse juno, visual basic 2012) each 1 continuously results in error. here have done far:

  • confirmed c++ not problem building , running hello world program
  • linked header file following path (c:\program files (x86)\ivi foundation\visa\winnt\include)
  • linked library using path (c:\program files (x86)\ivi foundation\visa\winnt\lib\msc\visa32.lib)
  • applied library each project

i have tried using 64-bit version same error. current code:

#include <iostream> #include <visa.h> using namespace std;   int main () {     visession rmsession;    viopendefaultrm(&rmsession);     return 0; }

the code simple, when run, returns error:

error: 'viopendefaultrm' not declared in scope

this weird since in scope. has been giving me trouble many days - appreciated. thank you!

the function called viopendefaultrm, not viopendefaultrm.

for avoidance of confusion such errors in future, viopendefaultrm(&rmsession) in code not declaration of function, invocation or call of function (or be, if such function existed).

in c++, compiler must see declaration of function before permit invocations of function, can tell whether invocation conforms function's signature (or 1 of signatures of overloaded function), , declaration must still in scope @ point of invocation.

the declaration of viopendefaultrm is:

vistatus _vi_func  viopendefaultrm (vipsession vi);

you find in visa.h, , in scope @ point have attempted call viopendefaultrm because, including visa.h before define main, declared in scope enclosing main, i.e. in global scope.


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