mahmuod
asked on
how to detect type device scanner or keyboard ?
hi
i want design form these form accept number for symbols scanners barcode only if any one type from normal keyboard or copy past number not accept
how to detect type device scanner or keyboard ?
i want design form these form accept number for symbols scanners barcode only if any one type from normal keyboard or copy past number not accept
how to detect type device scanner or keyboard ?
SOLUTION
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Check the events that are triggered when the scanner sends it information to the application. This can change depending on the scanner.
If the scanner sends only a KeyPress or a TextChanged and no KeyDown, then simply set e.SuppressKeyPress=True in the KeyDown event of the control. This will prevent a key from the keyboard from going to the control.
If this does not work with you scanner, you might want to use a timer to calculate the time it takes to type fill the control. Manual entry is usually a lot slower than the scanner, so with some tests, you should be able to come with a duration that will tell you if the scanner or the keyboard is sending the data. If the timing between the first character and the second one is too long, delete the first character and display a warning message.
If the scanner sends only a KeyPress or a TextChanged and no KeyDown, then simply set e.SuppressKeyPress=True in the KeyDown event of the control. This will prevent a key from the keyboard from going to the control.
If this does not work with you scanner, you might want to use a timer to calculate the time it takes to type fill the control. Manual entry is usually a lot slower than the scanner, so with some tests, you should be able to come with a duration that will tell you if the scanner or the keyboard is sending the data. If the timing between the first character and the second one is too long, delete the first character and display a warning message.
ASKER
The scanner action same keyboard . Can not select type keyboard or scanner
But if the code only one deget can not calculate time
But if the code only one deget can not calculate time
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