Solved

Mid function

Posted on 2004-08-02
9
405 Views
Last Modified: 2013-12-24
Hi,
I am getting the following error
Parameter 3 of function Mid which is now -47 must be a non-negative integer

 <cfset msg = mid("#cfcatch.detail#", 48, len(cfcatch.detail)-47)>

Is there a way you can tell me why i am getting this error.Do i need to debug all of my queries for this error?
Please help me out

Thanks

0
Comment
Question by:Tpaul_10
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
9 Comments
 
LVL 15

Expert Comment

by:danrosenthal
ID: 11699792
len(cfcatch.detail) is 0 characters, so 0-47 = -47
0
 
LVL 15

Accepted Solution

by:
danrosenthal earned 500 total points
ID: 11699802
You can prevent the error by checking to make sure the length is more than 48 chars.

<CFIF LEN(cfcatch.detail) gt 48>
  <cfset msg = mid("#cfcatch.detail#", 48, len(cfcatch.detail)-47)>
</CFIF>

Of course this would still fail if cfcatch.detail was not defined. If you wanted to check for that also you can do it this way:

<CFIF ISDEFINED("cfcatch.detail") AND LEN(cfcatch.detail) gt 48>
  <cfset msg = mid("#cfcatch.detail#", 48, len(cfcatch.detail)-47)>
</CFIF>

0
 
LVL 9

Expert Comment

by:Jerry_Pang
ID: 11700233
Mid function takes 3 parameters
Syntax
MID(String, Startposition, numberofchars)

from your code
<cfset msg = mid("#cfcatch.detail#", 48, len(cfcatch.detail)-47)>

len(cfcatch.detail)-47, like danrosenthal  said returns -47

thus, Parameter 3 of function Mid which is now -47 must be a non-negative integer
you cant have -47 number of characters.

you could also do this

<cfset msg = mid("#cfcatch.detail#", 48, iif(len(cfcatch.detail)-47) GT 0, len(cfcatch.detail)-47), 1)>

this makes sure the 3rd parater returns > 0

0
How Do You Stack Up Against Your Peers?

With today’s modern enterprise so dependent on digital infrastructures, the impact of major incidents has increased dramatically. Grab the report now to gain insight into how your organization ranks against your peers and learn best-in-class strategies to resolve incidents.

 
LVL 15

Expert Comment

by:danrosenthal
ID: 11700251
actually IIF() is a slow function, you should use MAX() instead...

<cfset msg = mid(cfcatch.detail, 48, MAX(len(cfcatch.detail)-47,1))>
0
 
LVL 17

Expert Comment

by:anandkp
ID: 11700601
if u tell us what exactly u wish to do - maybe we cld suggest a better logic - than just using the Mid()
do let us know - if u think we cld help u out ... else u already have explanation of Mid() above :)
0
 
LVL 11

Expert Comment

by:hart
ID: 11702292
yeah i think u should expalin why u need a hard coded 48 in the mid()...
may be we could give u a work around or  better solution :-)

Regards
Hart
0
 

Author Comment

by:Tpaul_10
ID: 12022744
Accept
0

Featured Post

Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Problem to Eclipse 16 154
Problem to get function 52 123
apply ddos protection on all network interface 2 140
How to set up WAMP on a windows 8.1 IIS machine 14 47
A web service (http://en.wikipedia.org/wiki/Web_service) is a software related technology that facilitates machine-to-machine interaction over a network. This article helps beginners in creating and consuming a web service using the ColdFusion Ma…
Periodically we have to update or add SSL certificates for customers. Depending upon your hosting plan you may be responsible for the installation and/or key generation. In the wake of Heartbleed many sites were forced to re-key. We will concen…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

759 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question