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A char2num function that works for ASCII codes 0-->255.

Posted August 13th, 2008 by andyfaff
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The inbuilt char2num function only works properly for ASCII codeset characters lying in between 0 and 127. However a lot of internet based applications, such as telnet, use characters above 127 regularly. These don't print properly in IGOR. This snippet performs the char2num function for characters that lie in between 0 and 255.
i.e. one gets around the problem:

print char2num(num2char(56))
56
print char2num(num2char(249))
-7
print num2char(249)
ÿ

Function extendedASCIIchar2num(chars)
	string chars
	make/o/t/n=(strlen(chars),2) W_chartranslation
	variable ii,decChar
	for(ii=0 ; ii < strlen(chars) ; ii+=1) 
		W_chartranslation[ii][0] = chars[ii]
 
		decChar = char2num(chars[ii])
		if( 0 <= decChar && decChar <= 127)
			W_chartranslation[ii][1] = num2istr(decChar)
		else
			W_chartranslation[ii][1]= num2istr(255 + decChar + 1)	
		endif
	endfor
End

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