String to ASCII

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Hi at All,

I wuold like to convert a string of characters in ASCII values.

So I made a function using SSCANF:

 
Function/S str2ASCII(tmpstr)                                
    String tmpstr 
    String tmpASCII
    Variable i=0, tmp, num=strlen(tmpstr)           
    For (i=0;i<num;i+=1)
    sscanf tmpstr[i], "%c", tmp
    tmpASCII+=num2str(tmp)
    endfor
return tmpASCII
End


So I check the function and It works. When I use the function:

String test
String test2
test2="Hello"
test=str2ASCII(test2)


"Attempt to use a null string variable" appears and this message "Missing text resource for error: 0" appears on the command line.

Where is the error? Because If I add print command in the function, a right result appears.

Thanks in advance.

Matteo
Try this

Function/S str2ASCII(tmpstr)                                
    string tmpstr
 
    string tmpASCII="" // required declaration here, otherwise string is NULL
    variable i, tmp, num=strlen(tmpstr)
    
    for (i=0;i<num;i+=1)
         sscanf tmpstr[i], "%c", tmp
         tmpASCII+=num2str(tmp)
    endfor
        return tmpASCII
end


which gives

•print str2ascii("Hello")
  72101108108111


--
J. J. Weimer
Chemistry / Chemical & Materials Engineering, UAHuntsville

June 27, 2012 at 08:11 am - Permalink

Here is a solution that does not use sscanf:
Function/S Str2ASCII(str)                               
    string str
 
    String result = ""          // Initialize to empty string
    Variable i, count=strlen(str)
 
    for (i=0;i<count;i+=1)
         String ch = str[i]
         Variable num = char2num(ch)
         result += num2str(num)
    endfor
 
    return result
End

June 27, 2012 at 08:36 am - Permalink