How can I convert a var decimal val into equivalent ASCII char or Hex value?

[steve h]

I wish to convert a variable decimal value (checksum) into the equivalent ASCII character or Hex value(\x). This is so I may send the checksum decimal value as a ASCII character to my Rs232 port using LabWindows CVI.

[SachaE]

Hi,

  a decimal number is still a number in Hex format. It's the view of the actual data value that gives you it in Hex.

Interms of converting it to Ascii, simply use the convert to U8, and then use the typecast function.(defaults to string type)

Hope that helps

Sacha Emery

National Instruments (UK)

[SachaE]

Hi - ok I misread that - sorry CVI (not LabVIEW)

Code snippet attached :

#include <userint.h>
#include <ansi_c.h>

static unsigned int x = 65;
static unsigned char y;
y = (unsigned char)x;

// for showing the information only :
printf("X = %d, Y = %c",x,y);

Thanks

Sacha Emery

[steve h]

I tried your example, but the code would not compile, with warning errors starting at the line y = (unsigned char)x;          

the error warnings were as below:

ascii.c - 5 errors,1 warning
  7, 3     Redeclaration of 'y' previously declared at ascii.c:6.
  7, 3     Warning: Inconsistent linkage for 'y' previously declared at ascii.c:6.
  7, 21    Initializer must be constant.
  7, 21    Too many initializers.
  10, 8    syntax error; found 'string constant' expecting ')'.
  10, 29   Redeclaration of 'printf' previously declared at stdio.h:194.

[SachaE]

Hi,

  incredibly strange that didn't work for you. I did it in the interactive window rather than create an entire project for it so the declarations and stuff might not have gone into the correct place for you.

What version of CVI are you using?

Here's a project in cvi 7.1.

It's only a .c file being used, so you could always make a new project file if you're on a previous version

Thanks

Sacha Emery

National Instruments (UK)

[steve h]

I am using Cvi version 6.

Also I opened your .zip file and there is no file/data in it to extract.

[SachaE]

Hi,

  I think you have greater issues than not being able to run the code then.

I checked the files are in there, and that they run ok. Do you have another computer with internet access that you can pull down the files with?

Do you have another PC with LabWindows/CVI that you can try the code snippet on I embedded in the previous message?

Thanks

Sacha Emery

National Instruments (UK)

[steve h]

I tried another computer using Winzip version 8; the zip file is empty, maybe you are using another version of Winzip?

Please can you check using another computer that the files are there in the zip folder?

[saikey]

I just opened the zip file straight from the post, (not downloaded and saved first) and it worked fine.  Very odd indeed.