Chr(STX) and chr(ETX) error

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Dear All,

I have a program in VS2008/Win7 where i send some data from my desktop application to Lintec printer for printing barcode using null modem cable using COM Port.

In this program i have used Chr(STX) and Chr(ETX). It shows correct data.

But when i use this same program in Windows10 64 bit, it is showing different data for Chr(STX) and Chr(ETX).

Can someone help me where i am wrong.

What I have tried:

I tried to check the code using many forums, but no one has the reply.

Posted 17-Oct-18 16:20pm

Abhijeet Bhurke

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Comments

Dave Kreskowiak 17-Oct-18 22:57pm

Without seeing the relevant code, it's impossible for anyone to tell you what's wrong with it. STX and ETX are not part of the VB.NET language, so they have to be defined in your code somewhere.

Abhijeet Bhurke 18-Oct-18 0:01am

Dear Dave,
Thanks.

I have mentioned as below in my code in VS2008.

Public Const STX As Short = &H2S
Public Const ETX As Short = &H3S

Further, when using this when i try to compile my code in Windows7(32bit)/VS2008, it shows correct data, but when i try to compile the same source code in Win10(64bit) and VS2008 it shows some different codes.

I also tried to change the Configuration Manager to "x86" even then error.
Also i have prepared some screen shots, but i do not know how to post here in this forum.

If you have your email, id i can send it to you.
Please can you advise.

Abhijeet

Richard MacCutchan 18-Oct-18 3:52am

Please explain what these "different codes" are. We cannot guess what the compiler generates for you.

Abhijeet Bhurke 18-Oct-18 3:59am

Thank you Richard for reply.

In Win7-32 bit/VS2008 when debug, i can see " Q "
When debug the same program in Win10-64bit/VS2008, i can see " Q(smallsquare)"

Basically the Space before and after Q is ASCII code for 2 and ASCII code for 3.

Also can you advise me how can i share the photo on this forum? to show my current program.

Richard MacCutchan 18-Oct-18 4:06am

That means nothing, except that you are displaying non-printable characters in different ways. What we need to know is exactly what values are being generated by the different compilations.

Abhijeet Bhurke 18-Oct-18 4:23am

Hi Richard,
Can you share me your personal mail id, so that i can share you my codes pictures.
I understand for helping me you need proper reference, which i am not able to show here.
Please.

Richard MacCutchan 18-Oct-18 4:30am

No. I don't want to see code pictures. I want you to check exactly what values are being generated by the compiler in your code. I very much doubt that it would generate different values from the ones you expect.

Abhijeet Bhurke 18-Oct-18 4:53am

Yes Richard.
Different values can be seen in different OS.
This might be i think is creating error for me.

Richard MacCutchan 18-Oct-18 5:00am

Have you actually checked in the debugger what those values are? I suspect the only thing likely to be different is that the characters may be generated as 16-bit rather than 8 bit values.

Abhijeet Bhurke 18-Oct-18 5:32am

Hi Richard.
I am getting this value "Q" when compile in Win10 OS using VS2008
I should get "Q"

Richard MacCutchan 18-Oct-18 5:41am

Look what you have put in the message above: two strings that are exactly the same. Stop using what is displayed in character form and use your debugger to look at the actual numeric values.

Abhijeet Bhurke 18-Oct-18 6:14am

Dear Richard,
Yes, i am checking in my debugger and i really can see different values.
It is difficult to explain here, as i can see.

i will again check as how can i share with you my details.
Thanks

Richard MacCutchan 18-Oct-18 7:13am

What is difficult about posting those values in a message? Ican see the following in the debugger:


STX = &H0002
ETX = &H0003

Abhijeet Bhurke 18-Oct-18 10:02am

Dear Richard,
Thanks. You are right with the debugger values, but they are sent to the COM port of printer as special characters.
It is in the form of (Inverted Capital L - Subscripted)Q(Capital L - Superscripted)

I am using this program for printing some barcodes in my office.

Richard MacCutchan 18-Oct-18 10:23am

I am sorry but you seem to have no understanding of computer data. The values sent to the printer are pure bytes, the value x02, the value x51 (which represents the character Q in most Latin alphabets), and the value x03. I suggest you get a book on the basics; until you understand this you are going to be struggling.

Abhijeet Bhurke 18-Oct-18 10:30am

Dear Richard,

Thank you for reply and continuous support.
I will check it again till i succeed.

Abhijeet

Richard MacCutchan 18-Oct-18 10:33am

One thing you have never explained: have you actually tried to run this program in the 64 bit version? And if so, what happened?

Abhijeet Bhurke 19-Oct-18 22:35pm

Yes, it runs, but no output as expected.

Richard MacCutchan 20-Oct-18 3:47am

The next thing you should do is capture the output of the program and inspect it with a hex editor to see exactly what it is generating and why the printer does not produce anything.

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