Attempt to call the same function twice passing different arguments

Question

-- In my main function I do the following calls:

function Main()
    FBIVVoit(1,9,1,0)  
    FBIVVoit(1,9,1,1)
end

-- This is the function code:

function FBIVVoit(numTrain, numCar, numFBIVVoit, State)
  numTrainCount = 1
    while numTrainCount <= numTrain do
      numCarCount = 1
      while numCarCount <= numCar do
        FBIVVoit = dictionary.getvalue(Dict, 'SCVSStatutsV' .. numCarCount .. '.FBIVVoit')
        print('SCVSStatutsV' .. numCarCount .. '.FBIVVoit'
          .. ' before the change is: ' .. FBIVVoit)
        f:write(string.format('\n' .. os.date() .. ' -- ' .. 'SCVSStatutsV'
          .. numCarCount .. '.FBIVVoit' .. ' before the change is: ' .. FBIVVoit))
        dictionary.setvalue(Dict, 'SCVSStatutsV' .. numCarCount .. '.FBIVVoit', State);
        FBIVVoit = dictionary.getvalue(Dict, 'SCVSStatutsV' .. numCarCount .. '.FBIVVoit')
        print('SCVSStatutsV' .. numCarCount .. '.FBIVVoit' .. ' is now: ' .. FBIVVoit)
        f:write(string.format('\n' .. os.date() .. ' -- ' .. 'SCVSStatutsV'
          .. numCarCount .. '.FBIVVoit' .. ' is now: ' .. FBIVVoit))
        fSleep(1)
        numCarCount = numCarCount + 1
      end
      numTrainCount = numTrainCount + 1
    end
    print('Run stopped at ' .. os.date());
    f:write(string.format('\n' .. os.date() .. ' -- ' .. 'Run stopped'))
    f:close()
  end

-- When I run the Main, the first call to the FBIVTrain function goes through without a problem. at the second call I get the following error message:

error in LUA script: c:\lua\pstm_test.lua:95: attempt to call global 'FBIVVoit' (a number value).

-- What really bugs me is that I have many other functions I call more than once in a row with different arguments passed to the function and I do not get this behavior.

-- Anyone of you ever experience that or see something wrong looking at my code? Any help would be welcomed as I am stuck there.

W.B. W.B. · Accepted Answer · 2014-04-14T19:11:47

You overwrite the function here:

FBIVVoit = dictionary.getvalue(Dict, 'SCVSStatutsV' .. numCarCount .. '.FBIVVoit')

With the result of dictionary.getvalue(). So next time you try to call your function, it's not there anymore.

If you really want to use the same variable name inside the function, use local specifier. In fact, always use local for temporary variables. It's both much faster and doesn't pollute global namespace.

Attempt to call the same function twice passing different arguments

1 Answers