Problems with structures and strings

  • Thread starter Thread starter John
  • Start date Start date
J

John

Hi

I am having a strange problem with a structure and fixed string:

in the structure definition i have:


structure gamedefinitionfile
:
<VBFixedString(20)> Dim namegame As String

:

end structure

form code:

'in my code, i open the file (which may not exist)

Dim gamedef As gamedefinitionfile

FileOpen(fileno, gamedeffile, OpenMode.Random, OpenAccess.ReadWrite,
OpenShare.Shared, reclen)

FileGet(fileno, gamedef, 1)

If gamedef.namegame = "" Then

' problem is this never seems to get executed, ie it is never recognised as
null. But when i use a stop statement to check the value it shows as ""

end if

i have tried setting gamedef.namegame = "" before the fileget to no effect

i have tried trim(gamedef.namegame) = "" to no effect
 
John said:
Hi

I am having a strange problem with a structure and fixed string:

in the structure definition i have:


structure gamedefinitionfile
:
<VBFixedString(20)> Dim namegame As String

:

end structure

form code:

'in my code, i open the file (which may not exist)

Dim gamedef As gamedefinitionfile

FileOpen(fileno, gamedeffile, OpenMode.Random, OpenAccess.ReadWrite,
OpenShare.Shared, reclen)

FileGet(fileno, gamedef, 1)

If gamedef.namegame = "" Then

' problem is this never seems to get executed, ie it is never
recognised as
null. But when i use a stop statement to check the value it shows as
Click to expand...


Can never be null. Maybe Nothing. Null is something else dealing with
database (DBNull.Value)
""

end if

i have tried setting gamedef.namegame = "" before the fileget to no
effect

i have tried trim(gamedef.namegame) = "" to no effect
Click to expand...

What does
gamedef.namegame is Nothing
say?

If it returns False, what does
gamedef.namegame.length
return?


Armin
 
I've never used that tag, but perhaps the <VBFixedString(20)> tag is forcing
your string to 20 characters long?
 
SurturZ said:
I've never used that tag, but perhaps the <VBFixedString(20)> tag is
forcing
your string to 20 characters long?
Click to expand...
That is true - i've had to do a work around instead by setting it to
something then testing for that
 
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