Is it possible to define your own data type in VB? I know it can be done in SQL2K but thats a diffrent story? If you can does anyone have an example they can show me? thanks! Gordon R. Durgha
gd@vslink.net
gd@vslink.net
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Creating data types?
- Thread starter GDX
- Start date
VB6 allows for the definition of User Defined Data Types which are really a Structure of VB6 Native Variable Data Types.
The structure is defined through the TYPE statement which acts as a template.
Private Type udt_MyTypeAddress
strMyName as String
strMyStreet as String
strMyCityCode as String
strMyCity as String
End Type
The user definded variable you want to use in your program must then be defined as any other variable:
Dim udtAddress as udt_MyTypeAddress
From now on you can do anything you want (well almost anything) with the variable udtAddress: you can assign values to it, you can pass it to procedures, and so on ...
If, on the other hand, you want to define new native variables, such as TwentyBitsInteger, which acts as a signed Integer but with a 20-bit length, you can as far as I know NOT do it.
_________________________________
In theory, there is no difference between theory and practice. In practice, there is. [attributed to Yogi Berra]
The structure is defined through the TYPE statement which acts as a template.
Private Type udt_MyTypeAddress
strMyName as String
strMyStreet as String
strMyCityCode as String
strMyCity as String
End Type
The user definded variable you want to use in your program must then be defined as any other variable:
Dim udtAddress as udt_MyTypeAddress
From now on you can do anything you want (well almost anything) with the variable udtAddress: you can assign values to it, you can pass it to procedures, and so on ...
If, on the other hand, you want to define new native variables, such as TwentyBitsInteger, which acts as a signed Integer but with a 20-bit length, you can as far as I know NOT do it.
_________________________________
In theory, there is no difference between theory and practice. In practice, there is. [attributed to Yogi Berra]
MichaelRed
Programmer
Hmmmmmmmmmmmmmm,
rvbasic,
I don't QUITE agree. Yo can implement a CLASS which will "ACT" like a new type. Even your 20 Bit integer. Of course YOU would have to implement the properties and methods of the class which accomplish the variable transformations, however IF you were motivated to do so it should be quite doable. I would expect some interesting challenges in accomplishing the coersion for 'mixed mode' operations (combining the 20 bit Integer with the 'standard' numeric types, but even this should be "POSSIBLE".
On the other hand, II am not going to attempt that particular exercise just to show that it can be done.
MichaelRed
redmsp@erols.com
There is never time to do it right but there is always time to do it over
rvbasic,
I don't QUITE agree. Yo can implement a CLASS which will "ACT" like a new type. Even your 20 Bit integer. Of course YOU would have to implement the properties and methods of the class which accomplish the variable transformations, however IF you were motivated to do so it should be quite doable. I would expect some interesting challenges in accomplishing the coersion for 'mixed mode' operations (combining the 20 bit Integer with the 'standard' numeric types, but even this should be "POSSIBLE".
On the other hand, II am not going to attempt that particular exercise just to show that it can be done.
MichaelRed
redmsp@erols.com
There is never time to do it right but there is always time to do it over
MichaelRed
Programmer
And, I quote myself
" ... I am not going to attempt that particular exercise ... "
Just saying it SHOULD be Possible -- NOT saying it is pratical - at least not in VB.
MichaelRed
redmsp@erols.com
There is never time to do it right but there is always time to do it over
" ... I am not going to attempt that particular exercise ... "
Just saying it SHOULD be Possible -- NOT saying it is pratical - at least not in VB.
MichaelRed
redmsp@erols.com
There is never time to do it right but there is always time to do it over
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