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Call a function Open

Posted on 2001-06-08
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Last Modified: 2010-05-02
Hi,

I am trying to create a class to wrap around an adodb recordset. I am trying to create a disconnected recordset. As a result, certain recordset commands (move next, etc) I want to pass to the recordset but other (open, etc) I want to handle myself. But anyways in terms of user friendliness I want to conform to the adodb recordset interface as much as possible. To do this I need to create a function called open. VB won't let me because open is a reserved word. Is there any way to get around this?

Zaphod.
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Question by:Z_Beeblebrox
5 Comments
 
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Expert Comment

by:kmv
ID: 6170537
You can create COM object in C/C++ which aggregate recordset object interfaces. I see that you have enouph experience for this.

Good luck!
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Author Comment

by:Z_Beeblebrox
ID: 6171781
I want to write this in VB, not C++. Is there any way to create a class function called open in VB?

Zaphod.
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LVL 2

Expert Comment

by:i_jester69
ID: 6172884
I know what you mean, but you are better off just naming your methods with descriptive(non-reserved) names like "OpenRecordset"
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Accepted Solution

by:
ameba earned 0 total points
ID: 6174072
You can define interface IRecordset in type library, and then access your class clsRecorset via that interface.

' in clsRecordset
Implements IRecordset

' in your client's code:
    Dim rs As IRecordset
    Set rs = New clsRecordset
    rs.Open ...

' to create type library, you will need .IDL file, something like this
(I am not IDL expert, I copied this from Msado15.idl ;-))
// TypeLib : EX4.IDL (EX4)
// TargetFile : EX4.TLB

// UUID Usage:
// {3D6C1720-F527-11D3-A88C-ECBD3B289C70} : library EX4

[uuid(3D6C1720-F527-11D3-A88C-ECBD3B289C70),version(1.0),helpstring("Example 4 Library")]
library EX4
{
    importlib("STDOLE2.TLB");

    interface IRecordset;

    typedef [uuid(0000051B-0000-0010-8000-00AA006D2EA4)]
    enum {
        adOpenUnspecified = -1,
        adOpenForwardOnly = 0,
        adOpenKeyset = 1,
        adOpenDynamic = 2,
        adOpenStatic = 3
    } CursorTypeEnum;

    typedef [uuid(0000051D-0000-0010-8000-00AA006D2EA4)]
    enum {
        adLockUnspecified = -1,
        adLockReadOnly = 1,
        adLockPessimistic = 2,
        adLockOptimistic = 3,
        adLockBatchOptimistic = 4
    } LockTypeEnum;

    [
      odl,
      uuid(0000050E-0000-0010-8000-00AA006D2EA4),
      dual,
      nonextensible,
      oleautomation
    ]
    interface IRecordset : IUnknown {
        HRESULT _stdcall Move(
                        [in] long NumRecords,
                        [in, optional] VARIANT Start);
        [id(0x000003fa)]
        HRESULT _stdcall MoveNext();
        [id(0x000003fb)]
        HRESULT _stdcall MovePrevious();
        [id(0x000003fc)]
        HRESULT _stdcall MoveFirst();
        [id(0x000003fd)]
        HRESULT _stdcall MoveLast();
        [id(0x000003fe)]
        HRESULT _stdcall Open(
                        [in, optional] VARIANT Source,
                        [in, optional] VARIANT ActiveConnection,
                        [in, optional, defaultvalue(-1)] CursorTypeEnum CursorType,
                        [in, optional, defaultvalue(-1)] LockTypeEnum LockType,
                        [in, optional, defaultvalue(-1)] long Options);
        [id(0x000003ff)]
    };
}


Ref.:
IDL For VB Tutorial http://www.vb2themax.com/HtmlDoc.asp?Table=Articles&ID=130

Btw, it's easier to use word OpenRecordset.
0
 
LVL 7

Author Comment

by:Z_Beeblebrox
ID: 6211729
Seeing as how I accidentally posted this question for 0 points, I guess I'll just accept an answer rather than deleting the question.

Zaphod.
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