Visual Basic, Bar CODE VBX or Info, CODE, I/O info for VB 3.0

Bar CODE VBX or Info, CODE, I/O info for VB 3.0

Author	Message
Michael E. Gerna #1 / 5	Bar CODE VBX or Info, CODE, I/O info for VB 3.0 Does anyone have any information with using BarCode Scanners in VB 3.0.. Any idea's of any VBX's.. Personally I would assume that most would have to be an external dll source from C(++) to get this to work properly do to VB's limits on pointers etc... Thanks Alot.. Michael Gernaey ================================ Creative Consultants Custom Visual Basic, Visual (C)/C++, delphi , programming... Hey have fun that's what programming is for.. ================================
Tue, 31 Mar 1998 03:00:00 GMT

Pedro Ferrei #2 / 5	Bar CODE VBX or Info, CODE, I/O info for VB 3.0 Quote: >Does anyone have any information with using BarCode Scanners in VB 3.0.. Any >idea's of any VBX's.. >Personally I would assume that most would have to be an external dll source >from C(++) to get this to work properly do to VB's limits on pointers etc... Hi! I don't understand what you want. If it's reading the barcodes, why don't you use a scanner conected to the keyboard? This way for the program it's the same as typing in the keyboard! If it's printing barcodes, try looking at: http://www.jumbo.com/prog/win/vbasic or http://coyote.csusm.edu/winworld/ Best luck -- Pedro Ferreira (Net. admin.) Niposom - J. Nabais, lda
Thu, 09 Apr 1998 03:00:00 GMT

bjo.. #3 / 5	Bar CODE VBX or Info, CODE, I/O info for VB 3.0 Quote: >>Does anyone have any information with using BarCode Scanners in VB 3.0.. Any >>idea's of any VBX's.. >>Personally I would assume that most would have to be an external dll source >>from C(++) to get this to work properly do to VB's limits on pointers etc... > Hi! > I don't understand what you want. > If it's reading the barcodes, why don't you use a scanner conected to > the keyboard? This way for the program it's the same as typing in the > keyboard! I would _SERIOUSLY_ recommend against going this route. I've written several barcode-enabled VB apps. I have found that "keyboard wedge" type barcode readers have serious deficiencies when used within Windows. In any Windows based application, it is exceedingly difficult to take complete ownership of all keyboard input. There is no straightforward way to ensure that data from the scanner is not accidentally sent to the wrong application. Even if the data does end up in your application, you also have to ensure that the keyboard/cursor focus is always at the right place when the user decides to scan something. I recommend using a serial port based scanner. This way, the information from the scanner comes through on its own, independent data stream, and doesn't have to be filtered out of keyboard input. You use the standard MSCOMM.VBX, and it works like a charm. As for printing the barcodes, there are many barcode fonts (particularly the CODE 3of9 fonts) available... Byron Jones - Hide quoted text - - Show quoted text - Quote: > If it's printing barcodes, try looking at: > http://www.jumbo.com/prog/win/vbasic or > http://coyote.csusm.edu/winworld/ > Best luck > -- > Pedro Ferreira (Net. admin.) > Niposom - J. Nabais, lda
Sat, 18 Apr 1998 03:00:00 GMT

RLounsbu #4 / 5	Bar CODE VBX or Info, CODE, I/O info for VB 3.0 On the subject of keyboard wedge interfaces, one way to make sure that data gets into the correct field is to provide only one entry field. Tag each barcode with a prefix character (P = part number, I = invoice number, etc.) and have the application read the data and send it to the correct variable. There is no doubt that a serial port scanner gives the programmer absolute control of the scanner data (as absolute as anything gets in a Windows environment), but it does require a little more programming work. Bob Lounsbury MEC Software bar code specialists
Sun, 19 Apr 1998 03:00:00 GMT

Pedro Ferrei #5 / 5	Bar CODE VBX or Info, CODE, I/O info for VB 3.0 To use a serial port based scanner, your app. will have to be prepared for it. And if you design the application, it will require more programing. Instead, a wedge barcode reader will work in every application, since it sends data like the keyboard does. And in most cases the barcode reader can be programmed to send a CR/LF at the end of the string, so you'll have automatic input of data. About the scanned data ending up in the wrong place: if the application has a lot of input boxes in the form where you have to input a code, then it is not a good application (or at least not a user friendly one) ! And if it ends up in the wrong application, thats the price you pay for a multi-application operating system... the user will have to learn how to deal with the advantages and problems of such operating systems, or go back to DOS. Quote: >I would _SERIOUSLY_ recommend against going this route. I've written >several barcode-enabled VB apps. I have found that "keyboard wedge" >type barcode readers have serious deficiencies when used within Windows. >In any Windows based application, it is exceedingly difficult to take >complete ownership of all keyboard input. There is no straightforward >way to ensure that data from the scanner is not accidentally sent to >the wrong application. Even if the data does end up in your application, >you also have to ensure that the keyboard/cursor focus is always at the >right place when the user decides to scan something. >I recommend using a serial port based scanner. This way, the information >from the scanner comes through on its own, independent data stream, >and doesn't have to be filtered out of keyboard input. You use the >standard MSCOMM.VBX, and it works like a charm. >As for printing the barcodes, there are many barcode fonts (particularly >the CODE 3of9 fonts) available... >Byron Jones >> If it's printing barcodes, try looking at: >> http://www.jumbo.com/prog/win/vbasic or >> http://coyote.csusm.edu/winworld/ >> Best luck >> -- >> Pedro Ferreira (Net. admin.) >> Niposom - J. Nabais, lda -- Pedro Ferreira (Net. admin.) Niposom - J. Nabais, lda
Mon, 20 Apr 1998 03:00:00 GMT

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