Visual Basic

Christian Graus20-Jun-07 11:56

Christian Graus

20-Jun-07 11:56

You should validate your form and avoid null in the DB where-ever possible.

Why do you want null and not an empty string ?

Christian Graus - Microsoft MVP - C++

"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Vimalsoft(Pty) Ltd20-Jun-07 19:35

Vimalsoft(Pty) Ltd

20-Jun-07 19:35

Am Sorry to put it that way, i meant Empty string, but the thing sometimes the user might enter something, what if the user does not enter anything?

Vuyiswa

Dave Kreskowiak21-Jun-07 4:12

21-Jun-07 4:12

Then the user has actually entered an empty string. An empty string is entered into the database exactly the same as a string of length greater than 0.

An empty string is most certainly not null.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Vimalsoft(Pty) Ltd21-Jun-07 22:40

Vimalsoft(Pty) Ltd

21-Jun-07 22:40

Thanks Dave,

i have solved the Problem , by converting everting input from a user to string, if the user enters nothing then, it wil be converted to empty String , and in my table it will be null.i have put this code in the Textchanged event

<br />
<br />
me.Tostring<br />
<br />

Thanks

Vuyiswa

Dave Kreskowiak22-Jun-07 16:41

22-Jun-07 16:41

Vuyiswamb wrote:
me.Tostring

Uhhh...Me refers to the instance of the class it appears in. If you used Me inside a Form class, you executed .ToString() on a Form.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

intptr

Taylor Kobani20-Jun-07 0:16

Taylor Kobani

20-Jun-07 0:16

i made a delegate of one sub and sent its method.methodhandle.value to a sub in a VisualFortran Dll.
the sub in VisualFortran creates an interface to work with this sub and calling it from fortran.
this works in vb6 when i send the (addressof sub) to visual fortran but it does not work when the delegate.method.methodhandle.value in vb.net is sent to the fortran dll.
i know intptr is not even a CLS-Comapliant but i recieve the error "protected memory ..."

A.E.K

Re: intptr

Dave Kreskowiak21-Jun-07 4:11

21-Jun-07 4:11

Without seeing your code that declares the delegate, the function your calling, and the callback function in your code, it's kind of hard to diagnose. This[^] is about the only thing anyone can recommend.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Re: intptr [modified]

Taylor Kobani22-Jun-07 7:58

Taylor Kobani

22-Jun-07 7:58

This is the code in VB.NET

Private Declare Function dll1 Lib "FileAddress" (ByVal ptr As Integer) as Single<br />
    Public Delegate Function del1(ByVal p As Single) As Single<br />
    Dim g1 As del1 = AddressOf proc1<br />
    Function proc1(ByVal p As Single) As Single<br />
        Return p ^ 2<br />
    End Function

Here is the function Call(in.Net):
dll1(g1.Method.MethodHandle.Value)

and here the code in VisualFortran:

Real function dll1(F)<br />
!dec$ attributes dllexport ::dll1<br />
!dec$ attributes alias :'dll1'::dll1<br />
<br />
interface <br />
 real function F(x)<br />
  real x<br />
 end<br />
end interface<br />
<br />
end

and I recieve this Error:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Notice that i call back a function in .Net from Visual Fortran (not another .Net)

thanx a lot

A.E.K

Add -in problems

Katarzyna_20-Jun-07 0:06

20-Jun-07 0:06

Hi I did an add-in for vs.NET 2003 and that element appeared in menu but I have a problem how to connect it with program I'd like to write. Which method is responsible for calling and where to set it? Could you help me or point out the webside with description?
Thank you for replays

Kasia

Dave Kreskowiak21-Jun-07 4:07

21-Jun-07 4:07

What is this "connection" supposed to do? What's it supposed to carry? What does this plugin do?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Katarzyna_21-Jun-07 11:03

21-Jun-07 11:03

I added add-in into the menu. I don't know how to bind this with form. How to call it? Which method is responsible for doing it?

Katarzyna

Dave Kreskowiak21-Jun-07 14:24

21-Jun-07 14:24

You haven't answered any of my questions. The is information that anyone MUST have to tell you anything useful.

Katarzyna_ wrote:
I don't know how to bind this with form.

A plugin to Visual Studio alters the functionality of Visual Studio, NOT your form.

Katarzyna_ wrote:
How to call it? Which method is responsible for doing it?

Your projects code doesn't call an AddIn to Visual Studio. There's nothing to "bind" to. There is no one method for calling an Add In.

Or maybe I'm confused as to what this Add In is doing. It's impossible to say because you haven't said ANYTHING about what the plugin does.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Katarzyna_21-Jun-07 21:51

21-Jun-07 21:51

I made an addin and it appeared in menu in Visual Studio. Now I'd like to have a possibility to choose that element in menu by click and call a form which I did. Simple path. Mayby it is imposible to do it. I just don't know.
I read about methods like:
OnConnection
OnDisconnection
OnStartupComplete
OnAddInsUpdate
OnBeginShutdown
but I don't know how to use it.

Dave Kreskowiak22-Jun-07 16:37

22-Jun-07 16:37

Which interface did you implement in your addin?

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Katarzyna_24-Jun-07 5:40

24-Jun-07 5:40

I've not implemented any interfaces in my addin yet because I don't know how to do it. It is just the problem I'd like sb to help me with.

Dave Kreskowiak24-Jun-07 6:13