 For Visual Basic 4.0, programmers can set
the bindable property of the OCX/ActiveX to bind to a database table field. When the users
change the record, the field value will be automatically put into the bindable property of
the OCX/ActiveX. For example, you can bind the Text property of the TextBox control with a
field of Text type in a table of a database.
In my products, the Animation GIF ActiveX can support data binding. The GIF
property is bindable. You can bind the GIF picture with a database table field. Because in
database, Text type doesn't support zero character, we should use Memo type to store the
GIF picture.
And another problem is in Visual Basic 4/5/6, the data binding using
DataControl doesn't support string that contains zero character. They look the zero
character as the string end character and cut the characters after the zero character
before passing the text to the ActiveX. Sometimes, the problem doesn't occur when using
Remote Data Control as the binding control. The behavior is related to the ODBC driver you
are using.
After wide testing, I found only the ADO Data Control using OLEDB technology
can pass the correct Memo data to the ActiveX in any condition. So if you want to use data
binding in my Animation GIF ActiveX. I suggest you to use Visual Basic 6.0 and the ADO
Data Control 6.0.
To use data binding is very easy like following steps:
- Put a ADO Data Control onto your form and set the database, cursor,
SQL/Table values using the ADO Data Control property pages.
- Put a ActiveX which has the bindable properties onto your
form.
- You can see a DataBindings item in the "Properties
Window" of the ActiveX. Click the "..." on the right of the item. You can
get the dialog box which you can set the data bindings.
I am using Microsoft Visual Basic 6.0, Copyright© 1987, 1998 Microsoft
Corporation.
For how to use ActiveX in Visual Basic 6. Please visit  . |
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