inexplicable crash fixed by superfluous assignment












1















I was testing a tiny snippet I'd written to format a timespan (e.g., last change 5m23s ago) and kept getting an error I couldn't understand. Every time I try to use the loop variable i directly in a call to ts(), ASP informed me An error occurred...



'the function

function ts(s)

    dim m: m = CLng(s  60): s = s mod 60

    dim h: h = CLng(m  60): m = m mod 60

    ts = right("00" & h, 2) & "h" & _

         right("00" & m, 2) & "m" & _

         right("00" & s, 2) & "s" 

end function 



'the test

for i = 0 to 90000 step 15 

   '               response.write i & ": " & ts(i) & "<br />" 'an error has occurred

    dim j: j = i : response.write i & ": " & ts(j) & "<br />" 'works fine

next


What in the world is going on here?



Why does ts(i) create an error every time?

Given that, why does j=i : ts(j) work fine?



It can't be a problem with the variable i, since it works fine with the write call. Here's some other things I tried: 



response.write i & ": "                     'no problem

'response.write ts(i)                       'crashes

'dim x: x = ts(i)                           'crashes

dim j: j = i                                'no problem

dim x: x = ts(j)                            'works

response.write x & "<br />"                 'works 

'response.write ts(j) & "<br />"            'also works 

'response.write i & ": " & ts(j) & "<br />" 'also works


(Finally, I know there's allegedly a way to make IIS display real errors. I'd love to hear how to do that without RDP access to the webserver.)






vbscript asp-classic







share|improve this question


















  • 3





    Try to change function ts(s) to function ts(ByVal s)

    – omegastripes
    Jan 3 at 18:48











  • That worked. SO ANGRY. function ts(sec) : dim s: s = sec also works.

    – Einstein X. Mystery
    Jan 3 at 19:15
















1















I was testing a tiny snippet I'd written to format a timespan (e.g., last change 5m23s ago) and kept getting an error I couldn't understand. Every time I try to use the loop variable i directly in a call to ts(), ASP informed me An error occurred...



'the function

function ts(s)

    dim m: m = CLng(s  60): s = s mod 60

    dim h: h = CLng(m  60): m = m mod 60

    ts = right("00" & h, 2) & "h" & _

         right("00" & m, 2) & "m" & _

         right("00" & s, 2) & "s" 

end function 



'the test

for i = 0 to 90000 step 15 

   '               response.write i & ": " & ts(i) & "<br />" 'an error has occurred

    dim j: j = i : response.write i & ": " & ts(j) & "<br />" 'works fine

next


What in the world is going on here?



Why does ts(i) create an error every time?

Given that, why does j=i : ts(j) work fine?



It can't be a problem with the variable i, since it works fine with the write call. Here's some other things I tried: 



response.write i & ": "                     'no problem

'response.write ts(i)                       'crashes

'dim x: x = ts(i)                           'crashes

dim j: j = i                                'no problem

dim x: x = ts(j)                            'works

response.write x & "<br />"                 'works 

'response.write ts(j) & "<br />"            'also works 

'response.write i & ": " & ts(j) & "<br />" 'also works


(Finally, I know there's allegedly a way to make IIS display real errors. I'd love to hear how to do that without RDP access to the webserver.)






vbscript asp-classic







share|improve this question


















  • 3





    Try to change function ts(s) to function ts(ByVal s)

    – omegastripes
    Jan 3 at 18:48











  • That worked. SO ANGRY. function ts(sec) : dim s: s = sec also works.

    – Einstein X. Mystery
    Jan 3 at 19:15














1












1








1








I was testing a tiny snippet I'd written to format a timespan (e.g., last change 5m23s ago) and kept getting an error I couldn't understand. Every time I try to use the loop variable i directly in a call to ts(), ASP informed me An error occurred...



'the function

function ts(s)

    dim m: m = CLng(s  60): s = s mod 60

    dim h: h = CLng(m  60): m = m mod 60

    ts = right("00" & h, 2) & "h" & _

         right("00" & m, 2) & "m" & _

         right("00" & s, 2) & "s" 

end function 



'the test

for i = 0 to 90000 step 15 

   '               response.write i & ": " & ts(i) & "<br />" 'an error has occurred

    dim j: j = i : response.write i & ": " & ts(j) & "<br />" 'works fine

next


What in the world is going on here?



Why does ts(i) create an error every time?

Given that, why does j=i : ts(j) work fine?



It can't be a problem with the variable i, since it works fine with the write call. Here's some other things I tried: 



response.write i & ": "                     'no problem

'response.write ts(i)                       'crashes

'dim x: x = ts(i)                           'crashes

dim j: j = i                                'no problem

dim x: x = ts(j)                            'works

response.write x & "<br />"                 'works 

'response.write ts(j) & "<br />"            'also works 

'response.write i & ": " & ts(j) & "<br />" 'also works


(Finally, I know there's allegedly a way to make IIS display real errors. I'd love to hear how to do that without RDP access to the webserver.)






vbscript asp-classic







share|improve this question














I was testing a tiny snippet I'd written to format a timespan (e.g., last change 5m23s ago) and kept getting an error I couldn't understand. Every time I try to use the loop variable i directly in a call to ts(), ASP informed me An error occurred...



'the function

function ts(s)

    dim m: m = CLng(s  60): s = s mod 60

    dim h: h = CLng(m  60): m = m mod 60

    ts = right("00" & h, 2) & "h" & _

         right("00" & m, 2) & "m" & _

         right("00" & s, 2) & "s" 

end function 



'the test

for i = 0 to 90000 step 15 

   '               response.write i & ": " & ts(i) & "<br />" 'an error has occurred

    dim j: j = i : response.write i & ": " & ts(j) & "<br />" 'works fine

next


What in the world is going on here?



Why does ts(i) create an error every time?

Given that, why does j=i : ts(j) work fine?



It can't be a problem with the variable i, since it works fine with the write call. Here's some other things I tried: 



response.write i & ": "                     'no problem

'response.write ts(i)                       'crashes

'dim x: x = ts(i)                           'crashes

dim j: j = i                                'no problem

dim x: x = ts(j)                            'works

response.write x & "<br />"                 'works 

'response.write ts(j) & "<br />"            'also works 

'response.write i & ": " & ts(j) & "<br />" 'also works


(Finally, I know there's allegedly a way to make IIS display real errors. I'd love to hear how to do that without RDP access to the webserver.)






vbscript asp-classic




vbscript asp-classic






share|improve this question













share|improve this question











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asked Jan 3 at 18:22









Einstein X. MysteryEinstein X. Mystery

322313




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  • 3





    Try to change function ts(s) to function ts(ByVal s)

    – omegastripes
    Jan 3 at 18:48











  • That worked. SO ANGRY. function ts(sec) : dim s: s = sec also works.

    – Einstein X. Mystery
    Jan 3 at 19:15














  • 3





    Try to change function ts(s) to function ts(ByVal s)

    – omegastripes
    Jan 3 at 18:48











  • That worked. SO ANGRY. function ts(sec) : dim s: s = sec also works.

    – Einstein X. Mystery
    Jan 3 at 19:15








3




3





Try to change function ts(s) to function ts(ByVal s)

– omegastripes
Jan 3 at 18:48





Try to change function ts(s) to function ts(ByVal s)

– omegastripes
Jan 3 at 18:48













That worked. SO ANGRY. function ts(sec) : dim s: s = sec also works.

– Einstein X. Mystery
Jan 3 at 19:15





That worked. SO ANGRY. function ts(sec) : dim s: s = sec also works.

– Einstein X. Mystery
Jan 3 at 19:15












1 Answer
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omegastripes clued me in.



Apparently in VBScript, the default is for parameters to be passed ByReference.

(Literally every other programming language I've ever used passes primitives ByValue)



This caused a problem when I changed the value of s inside the function.



Any of these snippets work just fine: 



function ts(ByVal s)

    ...

...

ts(i)



function ts(sec)

    dim s: s = sec

    ...

...

ts(i)


(or, as mentioned in the OP, passing the value in a non-loop-iterator variable)



function ts(s) 

... 

dim j: j = i: ts(j)





share|improve this answer
























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    active

    oldest

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    active

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    1














    omegastripes clued me in.



    Apparently in VBScript, the default is for parameters to be passed ByReference.

    (Literally every other programming language I've ever used passes primitives ByValue)



    This caused a problem when I changed the value of s inside the function.



    Any of these snippets work just fine: 



    function ts(ByVal s)
    
    ...
    
...
    
ts(i)
    

    
function ts(sec)
    
    dim s: s = sec
    
    ...
    
...
    
ts(i)


    (or, as mentioned in the OP, passing the value in a non-loop-iterator variable)



    function ts(s) 
    
... 
    
dim j: j = i: ts(j)





    share|improve this answer




























      1














      omegastripes clued me in.



      Apparently in VBScript, the default is for parameters to be passed ByReference.

      (Literally every other programming language I've ever used passes primitives ByValue)



      This caused a problem when I changed the value of s inside the function.



      Any of these snippets work just fine: 



      function ts(ByVal s)
      
    ...
      
...
      
ts(i)
      

      
function ts(sec)
      
    dim s: s = sec
      
    ...
      
...
      
ts(i)


      (or, as mentioned in the OP, passing the value in a non-loop-iterator variable)



      function ts(s) 
      
... 
      
dim j: j = i: ts(j)





      share|improve this answer


























        1












        1








        1







        omegastripes clued me in.



        Apparently in VBScript, the default is for parameters to be passed ByReference.

        (Literally every other programming language I've ever used passes primitives ByValue)



        This caused a problem when I changed the value of s inside the function.



        Any of these snippets work just fine: 



        function ts(ByVal s)
        
    ...
        
...
        
ts(i)
        

        
function ts(sec)
        
    dim s: s = sec
        
    ...
        
...
        
ts(i)


        (or, as mentioned in the OP, passing the value in a non-loop-iterator variable)



        function ts(s) 
        
... 
        
dim j: j = i: ts(j)





        share|improve this answer













        omegastripes clued me in.



        Apparently in VBScript, the default is for parameters to be passed ByReference.

        (Literally every other programming language I've ever used passes primitives ByValue)



        This caused a problem when I changed the value of s inside the function.



        Any of these snippets work just fine: 



        function ts(ByVal s)
        
    ...
        
...
        
ts(i)
        

        
function ts(sec)
        
    dim s: s = sec
        
    ...
        
...
        
ts(i)


        (or, as mentioned in the OP, passing the value in a non-loop-iterator variable)



        function ts(s) 
        
... 
        
dim j: j = i: ts(j)






        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Jan 3 at 20:08









        Einstein X. MysteryEinstein X. Mystery

        322313




        322313
































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