C and Cpp File Manipulation Searching for a string in a File Tutorial

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Tutorial: C and Cpp File Manipulation Searching for a string in a File Tutorial

How to find the first occurance of a string within a file, includes sample function.

Tutorial Details:

I started working on a project that was to replace the often times buggy and slow (and in my opinion just plain bad) Find Files/Folders function that comes with Windows (windows key + 'F'). In Windows XP the searching utility in the OS seems to be severly lacking in functionality. In previous versions of Windows I used i didn't find there to be too many problems.

The most important part of my project was searching for text within files, something which the Find Files/Folders function claims it can do but it never seems to return results even when I know there should be some. This is what caused me to look for a nice way to search for text inside of a file in much the same way strstr searches for a string inside a larger string. I did find a solution somewhere out there on the web but for reasons I still can't figure out (the code was very messy) it would stop actually looking once you searched through about 16MB worth of files in one run.

Since I could not find anything out there that would allow me to do very extreme amounts of file searching I had to make it myself. What i created is designed to generally be platform independent. Normally I do not write code to be this way because 99.9% of the time I develop things exclusively for Windows.

Because I happen to like them better this will be done with plain old C-style file functions for several reasons:
1. They're MUCH faster than C++ filestreams.
2. The compiled code is MUCH smaller than code using C++ filestreams.
3. They're compatable with old C code.
4. The code looks nicer (to me at least).
5. The project I was working with was using them.
6. They're fun and you should learn to use them.

I'm also going to be using malloc() and free() instead of new and delete. No real reason other than to make this code more C complient even though it is meant to be C++ code. And of course I'll be using C-stlye strings and C-syle string functions, I always do this with code I plan on recycling, because if I ever put it in a DLL I can rest assured programs written in another language will be able to use the function. A program written in VB won't be able to make use of a function inside a DLL that returns a std::string, but it can make use of a function that returns a pointer to a C-style string.

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