Using Module seems to cause error

[Brooks_Van_Horn]

In vs2013 debug mode, I set a break-point just before I cann an interger function with a character string argument but when I step into the function the value of the argument has changed.I'm sending a character(120) variable and I reference the routine using a 'use mStrlnth' statement. The module is:

Module mStrLnth
   
Implicit None

Contains
 
Integer(4) Function StrLnth (myStr)
 
!  This function finds the length of a string which may be zero length
!  if nothing is in the string but spaces, tabs, or ""C marks
 
character(*),Intent(inout):: myStr

character(512)::  fld  ! I create this variable only for debugging
Integer(4):: i, sl, j, kk
 
  sl = 0
  i = len_trim(myStr)
  fld = myStr(1:i) // achar(0)
  do j = 1, i
    kk = ichar(fld(j:j))
    if ((kk >= 33) .and. (kk <= 122)) then
       sl = j
    else
       exit
    end if
  end do
  StrLnth = sl
  return
  
end function StrLnth

end module mStrLnth

The calling routine snippet is:

use mStrLnth

...

       iret = RegQueryValueEx( hKey, "Data4"C, NULL, NULL, LOC(Buff), LOC(iLen))
       if (iret /= ERROR_SUCCESS) then
          fmt = "Data4"C
          write(LnBuff,'(i4)') __LINE__
          Go to 998
       end if
       if (iLen > 5) Then
!         and so remove trailing blanks
          myBuff = "                                                  "C
          myBuff = Buff(1:iLen)
          iLen = StrLnth(myBuff)

I'm sending something like '123456789'

and I'm receiving something like '4' followed by a few garbage characters'

Any ideas would be appreciated.

Thanks,

Brooks

PS,

I'm compiling and running x64 builds with vs2013 on a 64bit Win 10 machine using an Intel i7-4770 processor with 32GB RAM and using IVF Parallel Studio XE Composer Edition v2017 r2.

[mecej4]

It would help if you were to provide a complete main program that calls your function. It occurs to me that the function code is not living up to its billing. For example, if the argument is '    X    ', which contains four blanks before and after 'X', your function would return 0 instead of 5, because of the premature EXIT.

[Brooks_Van_Horn · Accepted solution]

I apologize for this entry. It was using some non-inherited alignment options for the compiler.

Brooks