Should be a simple conversion!!

[Russ]

Hi guys & gals
I need to convert, in C#, a decimal hex string into an ascii string
(ie "56" -> "V"), and I can't find anything in the vs2003 help files
that is remotely helpful. Any suggestions that will save me writing my
own convert function would be gratefully received!

 

[Jon Skeet [C# MVP]]

Hi guys & gals
I need to convert, in C#, a decimal hex string into an ascii string
(ie "56" -> "V"), and I can't find anything in the vs2003 help files
that is remotely helpful. Any suggestions that will save me writing my
own convert function would be gratefully received!

Is it always a single character? If so, use:

char c = (char) int.Parse(originalString);

 

[Russ]

Hi Jon,
No, this doesn't work I'm afraid. It converts 56 to "8" rather than
"V", so it is obviously thinking that the 56 is decimal, not hex. Any
ideas please?
Russ

 

[Divyesh]

Is it always a single character? If so, use:

char c = (char) int.Parse(originalString);

that will convert it from ASCII int to CHAR.
Try out this
char c = (char)int.Parse("56",System.Globalization.NumberStyles.HexNumber);

 

[Jon Skeet [C# MVP]]

No, this doesn't work I'm afraid. It converts 56 to "8" rather than
"V", so it is obviously thinking that the 56 is decimal, not hex. Any
ideas please?

Ah, I was confused by your use of "decimal hex string" in the original
post. I didn't see the "hex" bit, just the "decimal" bit (and didn't
check the code for 'V').

In that case, use int.Parse(text, NumberStyles.HexNumber) (and cast to
char as before).

Alternatively, use Convert.ToInt32(text, 16) (and cast).

 

[Russ]

Thanks guys for your virtually identical solutions. This worked well
I ended up putting it into a loop to get the whole string thus :-

string type = "";
for(int i=0;i<= hexstring.Length-1;i=i+2)
{
type = type + (char)int.Parse(hexstring.Substring(i,2),

NumberStyles.HexNumber);
}

(And, yes, I know that I should have used stringbuilder, but I will
tidy up later!!)
Russ