Visual Basic

31-Jan-07 23:50

In VB2005, most of the events pass the sender object as a parameter through the vent itself:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button8.Click<br />

Is there any way to get the object's name (not the type) of the sender? .ToString returns its type and I'm looking for a way to get "Button1".

I want to handle the xxxx_Click event for several buttons in the same event and without adding a new parameter with an id or something like that.

Thanks in advance,
Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

xstoneheartx1-Feb-07 0:13

1-Feb-07 0:13

you can use :
if ctype(sender,button).name="Button1" then
'do a task
end if

Christian Graus1-Feb-07 0:17

Christian Graus

1-Feb-07 0:17

Or better yet, cast to Control, which has that property and is more 'guarenteed'.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Marc Soleda1-Feb-07 0:25

1-Feb-07 0:25

Ok, that's right for a control but, if it isn't, and it's an object instanciated from a class library that after doing this cast doesn't have the Name property, how could I know it?

Thanks,
Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

shreekar1-Feb-07 0:35

shreekar

1-Feb-07 0:35

I think you know that the answer to your question is NO, not by the way already mentioned; however, what I understood you are saying is, in general, all objects will have some name, how can you get access to that name?
If that is the question, then I think that the only way is to check for the object type and access its name by the method appropriate to that object type.
for e.g., maybe you need to use reflection to get the class name OR
you can get the type name which should be the class name - I am not sure. Just my thoughts.

Shreekar

Marc Soleda1-Feb-07 0:56

1-Feb-07 0:56

Using reflection I just can get the class name/type. What I'm looking for is its name that, even it's not a control, I have instanciated an object as a class type and with a name. Isn't there any way to retrieve it?

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

Christian Graus1-Feb-07 9:22

Christian Graus

1-Feb-07 9:22

Marc Soleda wrote:
Using reflection I just can get the class name/type

No, using reflection you can find properties and you can get their values.

Marc Soleda wrote:
I have instanciated an object as a class type and with a name.

If you mean the variable name, you can't get it. If you mean a property on the control, you can get it with reflection, but if you don't know what the variable name is, then you're going to have a hard time.

An event handler is always going to have a control come in, I assume you mean the question more generally. It's unusual for your code to take an object and for you to have *no* idea what the object will be.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Marc Soleda1-Feb-07 20:36

1-Feb-07 20:36

Christian Graus wrote:
An event handler is always going to have a control come in...

Not always if it's an object's class - not a control - that raises an event when a something happens: I file has been received, ...

Christian Graus wrote:

It's unusual for your code to take an object and for you to have *no* idea what the object will be.

Unusual maybe but If I handle an event from several objects in only one eventhandler, then I need to differenciate between them to know which one has been.
At last, I've solved by using Object.ReferenceEquals that determines if two objects are the same instance.

Thanks,
Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

xstoneheartx1-Feb-07 0:36

1-Feb-07 0:36

Try
If sender.name="A Name" Then
'Do A Task
End If
Catch ex As Exception
MsgBox("The object dosn't support name property")
End Try

Guffa1-Feb-07 9:31

Guffa

1-Feb-07 9:31

Marc Soleda wrote:
Ok, that's right for a control but, if it isn't, and it's an object instanciated from a class library that after doing this cast doesn't have the Name property, how could I know it?

You can't, as it doesn't have a name.

What you are looking for is the name of the variable the holds the reference to the object. The problem is that there can be more than one variable referencing the object, or if there is a single variable, that variable might not have a name either, e.g. if it's part of an array.

---
Year happy = new Year(2007);

Marc Soleda1-Feb-07 20:39

1-Feb-07 20:39

Guffa wrote:
You can't, as it doesn't have a name.

That's the key! It doesn't have a name but I can compare two objects to know if they are the same instance that, for my purposes, is what I need: Object.ReferenceEquals

Thanks,
Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

Johan Hakkesteegt1-Feb-07 1:29

Johan Hakkesteegt

1-Feb-07 1:29

You could also try:

<br />
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click<br />
Dim Ctrl As Control<br />
For Each Ctrl In Me.Controls<br />
If Ctrl.GetType Is sender.GetType Then MsgBox(Ctrl.Name.ToString)<br />
Next<br />
End Sub<br />

As a small concern, I would like to ask you this, are you sure that you are not trying to take efficient coding a bit too far?

Johan

My advice is free, and you may get what you paid for.

Marc Soleda1-Feb-07 2:58

inserting and retrieving image from sqlserver2000 using vb.net

1-Feb-07 2:58

Johan Hakkesteegt wrote:
As a small concern, I would like to ask you this, are you sure that you are not trying to take efficient coding a bit too far?

In this context maybe, but I want to export this to a class library made by me and it would help a lot if we could handle some events in this way.

Thanks,
Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Dire Straits

Dotnetkanna31-Jan-07 23:42

Dotnetkanna

31-Jan-07 23:42

Hi,
I dont know how to insert and retrive the image from the sqlserver2000 by using vb.net..im having the coding of c sharp.net but i dont know how to convert into vb.net, could anybody help me plz..

C sharp coding as follows for insertion and retrival...

private void BUpload_Click(object sender, System.EventArgs e)
{
// Create a byte[] from the input file
int len=FUpload.PostedFile.ContentLength;
byte[] pic = new byte[len];
FUpload.PostedFile.InputStream.Read(pic,0,len);
try
{
connection.Open ();
SqlCommand cmd = new SqlCommand ("insert into img "
+ "(bImg) values (@bImg)", connection);
cmd.Parameters.Add ("@bImg", pic);
cmd.ExecuteNonQuery ();
}
finally
{
connection.Close ();
}
}

==================

private void BShow_Click(object sender, System.EventArgs e)
{

MemoryStream stream = new MemoryStream ();

try
{
connection.Open ();
SqlCommand command = new
SqlCommand ("select bImg from img", connection);
byte[] image = (byte[]) command.ExecuteScalar ();
stream.Write (image, 0, image.Length);
Bitmap bitmap = new Bitmap (stream);
Response.ContentType = "image/jpeg";
bitmap.Save (Response.OutputStream, ImageFormat.Jpeg);
}
finally
{
connection.Close ();
stream.Close ();
}
}
=======================
i need this coding into vb.net help me plz......

regards
Kanna...

Re: inserting and retrieving image from sqlserver2000 using vb.net

xstoneheartx31-Jan-07 23:58

system.windows,input class not available

31-Jan-07 23:58

You caan use this link to convert C# to vb and vice versa:
http://www.carlosag.net/Tools/CodeTranslator/Default.aspx[^]

bony_baba31-Jan-07 23:02

bony_baba

31-Jan-07 23:02

hi
i am working on vb.Net 2005,i want to import system.windows.input classes. i read on microsoft site that i have to reference presentationcore.dll in my application which is in Framework 3.0,i installed framework 3.0 but i am unable to find presentationcore.dll,if anyone have any idea so please help me.

Thanks

Thanks

Creating barcode Generating program

abhilash.asokan31-Jan-07 22:48

abhilash.asokan

31-Jan-07 22:48

i Need some help to generate an application which can generate BARCODE as an image..... i want to do it in VB.NET....
if any one have any idea about it..plz help me with this problem.....if u have any demo projects plz send it to this mail address

"abhilash.asokan@gmail.com"

Re: Creating barcode Generating program

xstoneheartx1-Feb-07 0:22