Current focused textbox

[Guest]

Hi, how can I get the current control having the focus for the active window
and be able to SendMessage over so that I can display text on it, eg. display
a string in a textbox. What I want is essentially the same effect as
SendKey().

I am using the Rs232 class for .net from Microsoft where I need to get the
input from the COM port and display the value in the vb.net form. I tried
using SendKey() but it doesn't show the value on the form and the codes after
SendKey command in the function doesn't get runned.

Eugene

 

[Ken Tucker [MVP]]

Hi,

Take a look at the forms activecontrol property.



http://msdn.microsoft.com/library/d...mscontainercontrolclassactivecontroltopic.asp



Ken

-----------------------------

Hi, how can I get the current control having the focus for the active window
and be able to SendMessage over so that I can display text on it, eg.
display
a string in a textbox. What I want is essentially the same effect as
SendKey().

I am using the Rs232 class for .net from Microsoft where I need to get the
input from the COM port and display the value in the vb.net form. I tried
using SendKey() but it doesn't show the value on the form and the codes
after
SendKey command in the function doesn't get runned.

Eugene

 

[Guest]

Hi Ken, glad for your help. With your example, consider I have multiple forms
shown in one application, how can I determine which form is currently active?
I see that the interface would set the IContainerControl.ActiveControl and
IContainerControl.ActivateControl, in this case, if the code just simply call
controlA.Focus = True, would I still be able to keep track of the control
having the focus?

Eugene

 

[Herfried K. Wagner [MVP]]

With your example, consider I have multiple forms
shown in one application, how can I determine which form is currently
active?

You can use 'Form.ActiveForm' to get a reference to the active form.

 

[Guest]

Hi Herfried,

thanks. But it seems that the .ActiveForm can only get the form from the
application itself. When I set my Notepad as the active form, then an
exception happens. Anyhow that I can get the control in other application?
Since other application may not be developed in .net, would it be a problem?

Secondly, I want to put some text on the control having the focus, which I
can use .Text property if it were a textbox. But when it is not, eg Button,
then I would modified the button's caption (.Text). Anyhow I can do something
like SendKey on the control so it would simply change the text wrongly.
Remember that I have got problem with SendKey initially that causes me to
find alternative. I still can't figure out why SendKey is not working. Anyone
know in what condition SendKey would not work?

Eugene