AccessForm Type Mismatch


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Thread: AccessForm Type Mismatch

  1. #1
    Join Date
    Oct 2006
    Posts
    2

    AccessForm Type Mismatch

    The following code runs as compiled code outside of MS Access. I'm trying to filter a recordset on the Access form. I can get a handle to the form object as an AccessObject, but when I try to set the object to an Access Form object I get an Error 13, Type Mismatch. I can retrieve a filtered recordset, but I can't apply this to the current recordset of the form. Any help would be greatly appreciated. The whole VB project can be emailed for debugging if that would help.
    Thanks!

    Public Sub FindRecord()

    Dim access_app As Access.Application
    Dim db As CurrentProject
    Dim cnn1 As New ADODB.Connection
    Dim comm As New ADODB.Command
    Dim rs As New ADODB.Recordset
    Dim rs_filtered As New ADODB.Recordset
    Dim rs_temp As New ADODB.Recordset
    Dim db_name As String
    Dim obj As AccessObject
    Dim frm_obj As AccessObject
    Dim frm As Access.Form
    Dim frm_coll As Collection
    Dim frm_name As String
    Dim ndx As Long
    Dim cnt As Long
    Dim frm_title As String
    Dim str As String
    Dim SPN_txt As String
    Dim prop As Property

    SPN_txt = "235128301001"
    frm_name = "f_Parcels"

    Set access_app = Application
    Set db = access_app.CurrentProject

    db_name = db.Name
    MsgBox "The open database is " & db_name

    For Each obj In db.AllForms
    'MsgBox "The object name is " & obj.Name
    If obj.Name = frm_name Then
    MsgBox "The desired object name is " & obj.Name
    Set frm_obj = obj
    Exit For
    End If
    Next

    '-------------------------------------------------
    'This is where the type mismatch happens
    Set frm = frm_obj
    frm_title = frm.Name
    MsgBox "The title of the form is " & frm_title
    '--------------------------------------------------

    Set cnn1 = DataEnvironment1.Connection_parcel
    Set comm = DataEnvironment1.Commands("parcel_att")
    'MsgBox "cnn1 state: " & GetState(cnn1.State)

    Set rs = comm.Execute
    Set rs_temp = rs
    rs_temp.Filter = "SPN = '" & SPN_txt & "'"

    Set rs_filtered = rs_temp

    cnt = rs_filtered.RecordCount
    MsgBox "The filtered record count is " & cnt

    End Sub

    Public Function GetState(intState As Integer) As String

    Select Case intState
    Case adStateClosed
    GetState = "adStateClosed"
    Case adStateOpen
    GetState = "adStateOpen"
    End Select

    End Function

  2. #2
    Join Date
    Nov 2003
    Location
    Alameda, CA
    Posts
    1,737
    I never worked with Access Forms, but here is my two pennies.
    I think the flow passes this line:

    MsgBox "The desired object name is " & obj.Name

    Change this with:

    MsgBox "The desired object name is " & obj.Name & " " & typeof obj is AccessForm

    and see if it prints True or False. It seems that obj is an AccessObject, not an AccessForm
    "There are two ways to write error-free programs. Only the third one works."
    Unknown

  3. #3
    Join Date
    Feb 2004
    Location
    Longueuil, Québec
    Posts
    577
    Access form recordsets are DAO Recordsets (Data Access Objects), not ADO Recordsets (ActiveX Data Objects). They are quite similar in use, but since they are not the same, you get the type mismatch.

    Although Microsoft has been telling everybody for many years to use ADO instead of DAO, DAO is native to Access and is generally more interesting to use with an Access database, as demonstrated by the fact that Microsoft still uses it internally in Access.

    If you want to manipulate an Access form, you have no choice but to use DAO.

    For code that works directly on the data, the choice is yours.

    DAO is more powerful and permits things in Access are not readily available in ADO, such as saving queries in the database from your code.

    However, it is not portable to other databases as ADO is. If you ever decide to convert from Access to SQL Server, your code is doomed if you used DAO. ADO code would still work (mostly) just by changing the connectiong string.
    Jacques Bourgeois
    JBFI
    http://www3.sympatico.ca/jbfi/homeus.htm

  4. #4
    Join Date
    Aug 2004
    Location
    Orange, California
    Posts
    1,263
    Actually your problem is that Access returns an AccessObject data type
    from the AllForms, or in fact any of the All????? collections.
    The more specific object type like Form, or Report, etc.. Can only access
    open objects. You must first open the Form, then you can get the Form
    object through the Forms Collection, which holds only Open Form objects.
    The mode in which you open the form, like Design mode, or Normal mode,
    etc. Determines which properties and methods you have access to; but
    mostly the form must be open.
    It's visiable flag can be set to True or False if you want to hide or unhide it.
    There is also a WindowMode parameter in the OpenForm command, which if
    set to Hidden, starts the form out with it's visiable flag set to false.
    DoCmd.OpenForm "f_Parcels", , , , , acHidden 'Open The Form
    Set frm = access_app.Forms("f_Parcels") 'Get the Form Object
    frm.Visiable = True 'Show The Form

  5. #5
    Join Date
    Oct 2006
    Posts
    2

    Problem Solved

    Thank you all so much for your thoughtful comments. Your explanation was quite clear Ron, and that piece of code was the missing link.

    Thanks again!

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