Solved

c code for searching pascal-style strings

Posted on 1998-06-30
1
193 Views
Last Modified: 2013-12-26
I have a dialog text-edit box that the user will type in what he wants to search for. Then I need to search through about 100 STR# for any matches. I can retrieve the text for the text-edit box, but then I don't really know where to go. All the c functions for handeling strings expect a c-style string, so it'd be a pain to covert everything. I heard something about a PStrCmp function, but I can't get it to work. Does anyone have some code or nifty functions that can help me? Thanks!
0
Comment
Question by:anthonyz
[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
1 Comment
 
LVL 2

Accepted Solution

by:
roov earned 50 total points
ID: 1291487
First, don't give so easily on conversion.
You might want to keep all your string resources in memory anyway, since loading them from the resource takes time, and if you keep them in memory, you might as well keep them as C strings, then get your user's string, convert it to C style, then use strstr or something similar.

Additionaly, the Mac Toolbox has EqualString, which compares two Pascal style strings.
The brute force of doing this search might look similar to this (without error checking/recovery):
short FindPattern(StringPtr inPattern, StringPtr inData)
{
      // return index of inPattern. ) if not found. Find last occurance...
      short location = 0;
      if (inData[0] < inPattern[0])
            return 0;
      if ((inData[0] == inPattern[0]) &&
            (EqualString(inData, inPattern, true, false))
      {
            return 1;
      }
      for (short ind = inData[0] - inPattern[0]; ind > inPattern[0]; ind--) {
            unsigned char storage = inData[ind];
            Boolean foundPattern = false;
            inData[ind] = inPattern[0];
            foundPattern = EqualString(&(inData[ind]), inPattern, true, false);
            inData[ind] = storage;
            if (foundPattern) {
                  location = ind;
                  break;
            }
      }
      return location
}

Sorry if this has minor bugs...

Enjoy...
0

Featured Post

Enroll in June's Course of the Month

June’s Course of the Month is now available! Experts Exchange’s Premium Members, Team Accounts, and Qualified Experts have access to a complimentary course each month as part of their membership—an extra way to sharpen your skills and increase training.

Question has a verified solution.

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

Introduction: Database storage, where is the exe actually on the disc? Playing a game selected randomly (how to generate random numbers).  Error trapping with try..catch to help the code run even if something goes wrong. Continuing from the seve…
Introduction: Dialogs (2) modeless dialog and a worker thread.  Handling data shared between threads.  Recursive functions. Continuing from the tenth article about sudoku.   Last article we worked with a modal dialog to help maintain informat…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…

691 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