I have a textbox in my c# application that gets the code from RFID Reader The RFID reader is connected to my computer using USB port .So My textbox should always be aware to read the data from RFIDReader because i can't lose the data .
The RFID Reader is plug and play .and it works like a keyboard and reads the data from the RFID card and returns the serial .
My solution is just create a textbox to get the received data .But how can i sure that every time the cursor is focused on my textbox to get the data .Do you have better solution if No My question is :
how can i sure that every time the cursor is focused on my textbox to get the data?
maybe the better solution is get the data from the socket ?!
To make your textbox always the focused control, set the focus back when it's lost:
textBox1.Leave += (o, e) => { textBox1.Focus(); };
You should write this code into the constructor after InitializeComponent.
Related
I'm developing a PDF creator using Windows Forms application in Visual Studio Community 2017. I'm using MigraDoc to generate PDFs and they are directly created by a series of data inserted by the user in textboxes.
The page for inserting and displaying the data is the same, because I want a real time update of the PDF document preview. To display the PDF I'm using an axAcroPDF element obtained in the COM section after the installation of Adobe Reader.
In order to update the PDF document I have written a class that simply introduces the new elements (I use a Leave event trigger on textboxes to call the update) and load the new PDF file inside the axAcroPDF element:
axAcroPDF1.LoadFile(filename);
The problem is the fact that each time I insert new data in one of the textboxes and the leave event is triggered it is like the entire form is reloaded and I lose focus on the textbox I was writing on (data inserted remains but the focus gets totally lost and the writing cursor is not preserved). This happens to the other textboxes if I click on another one or if I use tab to move to the next one. Notice that the PDF is correctly updated. Is there any method to avoid this problem and update the PDF section without losing focus on textboxes? Is it also possible doing that on a changetext event listener for those textboxes?
Here is an extract of the code use. The function updateText is called when a changetext event is detected on the textbox:
private void updateText(object sender, EventArgs e)
{
updateDocument();
axAcroPDF1.LoadFile(filename);
TextBox s = (TextBox)sender;
s.Focus();
}
I am working on C#.
I am creating application which takes input from multiple barcode reader via USB.So,i want to know that from which reader i am getting value
Bar code scanners work by letting the system think their input comes from the keyboard.
So, one way of doing this:
bar code scanners can be programmed to send pre- and or suffixes with every scan.
You could prefix every scan with the e.g. 'F12' key for one scanner and with the 'F11' key for the other scanner. In the main form of your application, in the keypreview event, you scan for 'F12' and 'F11' keys, and if one comes in, you pop up a modal dialog with a textbox that has the focus. The rest of the scanned characters will end up in the textbox of that dialog. If on top op that, you also program an 'Enter' keysequence as a suffix to the scanned code, it would automatically close that dialog (if the dialog is well built). One of the advantages of this pattern is that, if a code is not readable, you can press F11 or F12, and the dialog will pop up and you can manually type the number.
I'm making a c# windows application that will make it possible to fully control your windows computer via a gaming controller only. Right now I'm done with mouse control coding and I'm testing for bugs. What I want next is to create a virtual keyboard which shows up when a text box in any application is clicked. For example, the android keyboard which only appears when you need it. I have searched and the only thing I have found so far is how to call a function only when the text box is in the same Form. My question is if there is a way to make a listener when a textbox is clicked for all open programs. I would appreciate any help.
You should send the code or integer between forms when user click on the textbox using code like :
public string _label3
{
get { return label3.Text; }
}
you write value and send it to other form then receive it using set method.
public string _label3
{
set { return label1.Text; }
}
Using timer to watch coming value all time or check for label1.text then, when u receive this value
using this code to open virtual Keyboard.
System.Diagnostics.Process.Start("osk.exe");
[Winforms Application .NET 4.0 C#]
I have a textbox that receives data from a handheld barcode scanner.
I want my application to check if the text is valid without the user having to do anything.
Example rule:
Text length =18 and starts with '1520'
Text length =17 and starts with '0520'
Should i checkit with:
TextChanged event?
Add a timer to check the rules every 200-300ms?
something else?
TextChanged event will suffice, I have implemented something similar in the past and you will only be notified once so you will have the full barcode on each scan.
I have problem with reading text from card reader connected to USB.
I have method in window:
private void Window_KeyDown(object sender, KeyEventArgs e)
{
Key k = (Key)e.Key;
textBoxLogin.Text += k.ToString();
}
Problem is that, it simulates all pressed keys so if in my magnetic card i have something like:
!EXAMPLE,
that would read LeftShift1LeftShiftELeftShiftX etc..
Any solution how to change it?
Btw i know i can click on textBox and then read all from card reader, but that should work with disabled textBox.
Thank u for any answers!
I guess there is no easy way to convert keys to a string. If you really want to get the text from the Window_KeyDown callback, I think you'll have to code your own converter.
The source of your problem comes from the input : why does the card contains a series of keydown events rather than directly the characters ?