Windows Presentation Foundation
A part of the .NET Framework that provides a unified programming model for building line-of-business desktop applications on Windows.
2,710 questions
ASCII chars inside textbox
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(316.8, 38%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMF%3C/text%3E%3C/svg%3E)
Markus Freitag
3,786
Reputation points
Hello,
Format 06 Example:
[)><RS>06<GS>17V98897<GS>1P4L0014-163B<GS>SSA10197<RS><EOT>
(char)29 - GS
It seems that the textbox filters it.
I have to use a USB hand scanner to scan a code that contains special characters. Unfortunately these are no longer available in the text box. If I copy it over the clipboard, it works.
How can I solve this?
It seems that the textbox filters it.
{count} votes
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(294.40000000000003, 39%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAO%3C/text%3E%3C/svg%3E)
Andy ONeill 361 Reputation points2020-10-14T14:37:53.933+00:00 You should intercept and translate the string. Record and group separators have specific meaning - parse/split these and display your records and groups in separate lines.
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Markus Freitag 3,786 Reputation points
2020-10-14T14:49:10.35+00:00 You didn't get it right, if I paste it over the clipboard, everything is fine.
When I connect a scanner usb keyboard the characters (char)29 char(30) are deleted and then the analysis does not work.
Maybe this is a good way?
How can I intercept every single character? -
Andy ONeill 361 Reputation points
2020-10-14T15:03:58.577+00:00 What I'm saying is that this isn't one thing. These special characters define the shape of data rather than just being data.
A group is a group of things,
A record separator separates out records.
What you have scanned appears to logically be a group of multiple records.By default a scanner is "just" an input device like a keyboard.
Depending on model you can make them work differently and receive the data as events.Or you could handle the preview textinput event,
https://learn.microsoft.com/en-us/dotnet/api/system.windows.uielement.previewtextinput?view=netcore-3.1
I think that'll give you raw input in the textcompositioneventargs.
https://learn.microsoft.com/en-us/dotnet/api/system.windows.input.textcompositioneventargs?view=netcore-3.1 -
Markus Freitag 3,786 Reputation points
2020-10-15T05:27:33.847+00:00 I think that'll give you raw input in the textcompositioneventargs.
Thanks for your feedback.
By default a scanner is "just" an input device like a keyboard.
You are right, but is different however from keyboard to clipboard.
I scan the code with scanner to Notepad++. I see the special characters. I copy it via clipboard in my textbox, works well.I scan the code with scanner in my textbox, works not! Why?
Can you make a sample how I can implement your suggestion please?
Thanks.public class TextCompositionEventArgs : System.Windows.Input.InputEventArgs
How can I assign this to my textbox?
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