11.mht

本教程部分中将简单讨论COM和VB的相关内容

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          <TD>=A1=A1=A1=A1Dim WithEvents rs As =
Recordset<BR>=A1=A1=A1=A1Public Event=20
            RecordsetMove()<BR>=A1=A1=A1=A1Private Sub =
Class_Initialize()<BR>=A1=A1=A1=A1=A1=A1Set rs =3D=20
            New Recordset<BR>=A1=A1=A1=A1=A1=A1rs.ActiveConnection =3D =
"Provider=3DMicrosoft."=20
            &amp; _"Jet.OLEDB.4.0;Data Source=3DC:\Program Files\" &amp; =

            _"Microsoft Visual Studio\VB98\Nwind.mdb;" &amp; _"Persist =
Security=20
            Info=3DFalse"<BR>=A1=A1=A1=A1=A1=A1rs.Open "select * from =
customers", , adOpenKeyset,=20
            adLockOptimistic<BR>=A1=A1=A1=A1End =
Sub<BR><BR>=A1=A1=A1=A1Private Sub=20
            =
Class_Terminate()<BR>=A1=A1=A1=A1=A1=A1rs.Close<BR>=A1=A1=A1=A1=A1=A1Set =
rs =3D Nothing<BR>=A1=A1=A1=A1End=20
            Sub<BR><BR>=A1=A1=A1=A1Public Property Get CustomerID() As=20
            String<BR>=A1=A1=A1=A1=A1=A1CustomerID =3D =
rs("CustomerID")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let =
CustomerID(NewValue As=20
            String)<BR>=A1=A1=A1=A1=A1=A1'If the length of NewValue is =
greater than=20
            five<BR>=A1=A1=A1=A1=A1=A1If Len(NewValue) &gt; 5 =
Then<BR>=A1=A1=A1=A1=A1=A1=A1=A1'... then raise an=20
            error to the program<BR>=A1=A1=A1=A1=A1=A1=A1=A1'using this =
class, by=20
            running<BR>=A1=A1=A1=A1=A1=A1=A1=A1'Err.Raise vbObjectError =
+=20
            OurErrorNumber<BR>=A1=A1=A1=A1=A1=A1=A1=A1Err.Raise =
vbObjectError + 1, "CustomerID",=20
            _"Customer ID can only be up to five " &amp; _ "characters=20
            =
long!"<BR><BR>=A1=A1=A1=A1=A1=A1Else<BR>=A1=A1=A1=A1=A1=A1=A1=A1'... =
otherwise, change the field=20
            value<BR>=A1=A1=A1=A1=A1=A1=A1=A1rs("CustomerID") =3D =
NewValue<BR>=A1=A1=A1=A1=A1=A1End If<BR>=A1=A1=A1=A1End=20
            Property<BR>=A1=A1=A1=A1Public Property Get CompanyName() As =

            Variant<BR>=A1=A1=A1=A1=A1=A1CompanyName =3D =
rs("CompanyName")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let =
CompanyName(ByVal NewValue As=20
            Variant)<BR>=A1=A1=A1=A1=A1=A1rs("CompanyName") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get =
ContactName() As=20
            Variant<BR>=A1=A1=A1=A1=A1=A1ContactName =3D =
rs("ContactName")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let =
ContactName(ByVal NewValue As=20
            Variant)<BR>=A1=A1=A1=A1=A1=A1=A1=A1rs("ContactName") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get =
ContactTitle() As=20
            Variant<BR>=A1=A1=A1=A1=A1=A1ContactTitle =3D =
rs("ContactTitle")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let =
ContactTitle(ByVal NewValue As=20
            Variant)<BR>=A1=A1=A1=A1=A1=A1rs("ContactTitle") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get Address() As =

            Variant<BR>=A1=A1=A1=A1=A1=A1Address =3D =
rs("Address")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let =
Address(ByVal NewValue As=20
            Variant)<BR>=A1=A1=A1=A1=A1=A1rs("Address") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get City() As =
Variant<BR>=A1=A1=A1=A1=A1=A1City =3D=20
            rs("City")<BR>=A1=A1=A1=A1End =
Property<BR><BR>=A1=A1=A1=A1Public Property Let City(ByVal=20
            NewValue As Variant)<BR>=A1=A1=A1=A1=A1=A1rs("City") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get Region() As=20
            Variant<BR>=A1=A1=A1=A1=A1=A1=A1=A1Region =3D =
rs("Region")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let Region(ByVal =
NewValue As=20
            Variant)<BR>=A1=A1=A1=A1=A1=A1rs("Region") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get PostalCode() =
As=20
            Variant<BR>=A1=A1=A1=A1=A1=A1PostalCode =3D =
rs("PostalCode")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let =
PostalCode(ByVal NewValue As=20
            Variant)<BR>=A1=A1=A1=A1=A1=A1rs("PostalCode") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get Country() As =

            Variant<BR>=A1=A1=A1=A1=A1=A1Country =3D =
rs("Country")<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Let =
Country(ByVal NewValue As=20
            Variant)<BR>=A1=A1=A1=A1=A1=A1rs("Country") =3D =
NewValue<BR>=A1=A1=A1=A1End=20
            Property<BR><BR>=A1=A1=A1=A1Public Property Get Phone() As =
Variant<BR>=A1=A1=A1=A1 Phone=20
            =3D rs("Phone")<BR>=A1=A1=A1=A1End =
Property<BR><BR>=A1=A1=A1=A1Public Property Let=20
            Phone(ByVal NewValue As =
Variant)<BR>=A1=A1=A1=A1=A1=A1rs("Phone") =3D=20
            NewValue<BR>=A1=A1=A1=A1End =
Property<BR><BR>=A1=A1=A1=A1Public Property Get Fax() As=20
            Variant<BR>=A1=A1=A1=A1=A1=A1Fax =3D =
rs("Fax")<BR>=A1=A1=A1=A1End Property<BR><BR>=A1=A1=A1=A1Public=20
            Property Let Fax(ByVal NewValue As =
Variant)<BR>=A1=A1=A1=A1=A1=A1rs("Fax") =3D=20
            NewValue<BR>=A1=A1=A1=A1End =
Property<BR><BR>=A1=A1=A1=A1Public Sub=20
            AddNew()<BR>=A1=A1=A1=A1=A1=A1rs.AddNew<BR>=A1=A1=A1=A1End =
Sub<BR><BR>=A1=A1=A1=A1Public Sub=20
            Update()<BR>=A1=A1=A1=A1=A1=A1rs.Update<BR>=A1=A1=A1=A1End =
Sub<BR><BR>=A1=A1=A1=A1Public Sub=20
            CancelUpdate()<BR>=A1=A1=A1=A1=A1=A1If rs.EditMode =3D =
adEditInProgress Or=20
            _rs.EditMode =3D adEditAdd =
Then<BR>=A1=A1=A1=A1=A1=A1=A1=A1rs.CancelUpdate<BR>=A1=A1=A1=A1=A1=A1End =

            If<BR>=A1=A1=A1=A1End Sub<BR>=A1=A1=A1=A1Public Sub=20
            =
MoveNext()<BR>=A1=A1=A1=A1=A1=A1rs.MoveNext<BR>=A1=A1=A1=A1End =
Sub<BR><BR>=A1=A1=A1=A1Public Sub=20
            =
MovePrevious()<BR>=A1=A1=A1=A1=A1=A1rs.MovePrevious<BR>=A1=A1=A1=A1End =
Sub<BR><BR>=A1=A1=A1=A1Public=20
            Sub =
MoveFirst()<BR>=A1=A1=A1=A1=A1=A1rs.MoveFirst<BR>=A1=A1=A1=A1End =
Sub<BR><BR>=A1=A1=A1=A1Public Sub=20
            =
MoveLast()<BR>=A1=A1=A1=A1=A1=A1rs.MoveLast<BR>=A1=A1=A1=A1End =
Sub<BR><BR>=A1=A1=A1=A1Public Function=20
            FindByCustomerID(CustomerID As String) As =
Boolean<BR>=A1=A1=A1=A1=A1=A1'Uses the=20
            Find method to locate customers<BR>=A1=A1=A1=A1=A1=A1'with a =
matching=20
            CustomerID.<BR>=A1=A1=A1=A1=A1=A1'Returns True value is =
customer(s) found<BR>=A1=A1=A1=A1=A1=A1Dim=20
            varBookmark As =
Variant<BR>=A1=A1=A1=A1=A1=A1rs.MoveFirst<BR>=A1=A1=A1=A1=A1=A1rs.Find=20
            ("CustomerID=3D'" &amp; CustomerID &amp; =
"'")<BR>=A1=A1=A1=A1=A1=A1If rs.EOF =3D True=20
            Then<BR>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1FindByCustomerID =3D =
False<BR>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1rs.Bookmark =3D=20
            =
varBookmark<BR>=A1=A1=A1=A1=A1=A1Else<BR>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1Fi=
ndByCustomerID =3D True<BR>=A1=A1=A1=A1=A1=A1End=20
            If<BR>=A1=A1=A1=A1End Function<BR><BR>=A1=A1=A1=A1Public =
Property Get EOF() As=20
            Boolean<BR>=A1=A1=A1=A1'Example of a read-only =
property<BR>=A1=A1=A1=A1No Property Lets=20
            here<BR>=A1=A1=A1=A1EOF =3D rs.EOF<BR>=A1=A1=A1=A1End =
Property<BR>=A1=A1=A1=A1Public Property Get=20
            BOF() As Boolean<BR>=A1=A1=A1=A1=A1=A1'Another example of a =
read-only=20
            property<BR>=A1=A1=A1=A1=A1=A1BOF =3D =
rs.BOF<BR>=A1=A1=A1=A1End Property<BR>=A1=A1=A1=A1Private Sub=20
            rs_MoveComplete(ByVal adReason As ADODB.EventReasonEnum,=20
            _<BR>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1ByVal pError =
As ADODB.Error, adStatus As=20
            ADODB.EventStatusEnum, =
_<BR>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1ByVal pRecordset As=20
            ADODB.Recordset)<BR><BR>=A1=A1=A1=A1=A1=A1'Reacts to the =
recordset=20
            MoveComplete<BR>=A1=A1=A1=A1=A1=A1'method - raises event =
with each=20
            move<BR>=A1=A1=A1=A1=A1=A1RaiseEvent =
RecordsetMove<BR>=A1=A1=A1=A1End=20