Problems with structures and strings

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  • John
    #1

    Problems with structures and strings

    Hi

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

    in the structure definition i have:


    structure gamedefinitionf ile
    :
    <VBFixedString( 20)Dim namegame As String

    :

    end structure

    form code:

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

    Dim gamedef As gamedefinitionf ile

    FileOpen(fileno , gamedeffile, OpenMode.Random , OpenAccess.Read Write,
    OpenShare.Share d, reclen)

    FileGet(fileno, gamedef, 1)

    If gamedef.namegam e = "" 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.namegam e = "" before the fileget to no effect

    i have tried trim(gamedef.na megame) = "" to no effect



    Tags: None
    • Armin Zingler
      #2
      Re: Problems with structures and strings

      "John" <no-email-supplied@nothin g.comschrieb
      Hi
      >
      I am having a strange problem with a structure and fixed string:
      >
      in the structure definition i have:
      >
      >
      structure gamedefinitionf ile
      :
      <VBFixedString( 20)Dim namegame As String
      >
      :
      >
      end structure
      >
      form code:
      >
      'in my code, i open the file (which may not exist)
      >
      Dim gamedef As gamedefinitionf ile
      >
      FileOpen(fileno , gamedeffile, OpenMode.Random , OpenAccess.Read Write,
      OpenShare.Share d, reclen)
      >
      FileGet(fileno, gamedef, 1)
      >
      If gamedef.namegam e = "" 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

      Can never be null. Maybe Nothing. Null is something else dealing with
      database (DBNull.Value)
      ""
      >
      end if
      >
      i have tried setting gamedef.namegam e = "" before the fileget to no
      effect
      >
      i have tried trim(gamedef.na megame) = "" to no effect
      What does
      gamedef.namegam e is Nothing
      say?

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


      Armin

        Comment

        • =?Utf-8?B?U3VydHVyWg==?=
          #3
          Re: Problems with structures and strings

          I've never used that tag, but perhaps the <VBFixedString( 20)tag is forcing
          your string to 20 characters long?

          --
          David Streeter
          Synchrotech Software
          Sydney Australia


          "Armin Zingler" wrote:
          "John" <no-email-supplied@nothin g.comschrieb
          Hi

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

          in the structure definition i have:


          structure gamedefinitionf ile
          :
          <VBFixedString( 20)Dim namegame As String

          :

          end structure

          form code:

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

          Dim gamedef As gamedefinitionf ile

          FileOpen(fileno , gamedeffile, OpenMode.Random , OpenAccess.Read Write,
          OpenShare.Share d, reclen)

          FileGet(fileno, gamedef, 1)

          If gamedef.namegam e = "" 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
          >
          >
          Can never be null. Maybe Nothing. Null is something else dealing with
          database (DBNull.Value)
          >
          ""

          end if

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

          i have tried trim(gamedef.na megame) = "" to no effect
          >
          What does
          gamedef.namegam e is Nothing
          say?
          >
          If it returns False, what does
          gamedef.namegam e.length
          return?
          >
          >
          Armin
          >
          >

            Comment

            • John
              #4
              Re: Problems with structures and strings


              "SurturZ" <surturz@newsgr oup.nospamwrote in message
              news:4659E29D-839D-420B-B378-4ED260F63231@mi crosoft.com...
              I've never used that tag, but perhaps the <VBFixedString( 20)tag is
              forcing
              your string to 20 characters long?
              >
              --
              David Streeter
              Synchrotech Software
              Sydney Australia
              >
              >
              "Armin Zingler" wrote:
              >
              >"John" <no-email-supplied@nothin g.comschrieb
              Hi
              >
              I am having a strange problem with a structure and fixed string:
              >
              in the structure definition i have:
              >
              >
              structure gamedefinitionf ile
              :
              <VBFixedString( 20)Dim namegame As String
              >
              :
              >
              end structure
              >
              form code:
              >
              'in my code, i open the file (which may not exist)
              >
              Dim gamedef As gamedefinitionf ile
              >
              FileOpen(fileno , gamedeffile, OpenMode.Random , OpenAccess.Read Write,
              OpenShare.Share d, reclen)
              >
              FileGet(fileno, gamedef, 1)
              >
              If gamedef.namegam e = "" 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
              >>
              >>
              >Can never be null. Maybe Nothing. Null is something else dealing with
              >database (DBNull.Value)
              >>
              ""
              >
              end if
              >
              i have tried setting gamedef.namegam e = "" before the fileget to no
              effect
              >
              i have tried trim(gamedef.na megame) = "" to no effect
              >>
              >What does
              > gamedef.namegam e is Nothing
              >say?
              >>
              >If it returns False, what does
              > gamedef.namegam e.length
              >return?
              >>
              >>
              >Armin
              >>
              >>
              That is true - i've had to do a work around instead by setting it to
              something then testing for that

                Comment

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