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int fclose( FILE *stream ); fclose() takes a pointer to a FILE as a parameter and attempts to close the specified file. If

the file is closed successfully, fclose() frees up the memory allocated to the FILE struct and returns a value of 0. It is very important that you match every fopen() with a corresponding fclose(); otherwise, you ll end up with unneeded FILE structs floating around in memory. In addition, once you ve passed a FILE pointer to fclose(), that FILE pointer no longer points to a FILE struct. If you want to access the file again, you ll have to make another fopen() call. If fclose() fails, it returns the value EOF. EOF is a #define macro defined in <stdio.h> and stands for end of file. Though my example code ignores the value returned by fclose(), do as I say, not as I do. Check the value returned by every function that returns one. You can never have too much error checking in your code. Check the value returned by fclose().

Most of the common tools to modify the Registry are contained in the Control Panel When you use the Display applet to change a background, for example, the resultant changes are added to the Registry The Control Panel applets are what you should normally use to con gure the Registry However, there are times a virus attack, perhaps, or complete removal of a stubborn application when direct manipulation of the Registry is needed In this lab, you ll familiarize yourself with the Windows Registry and the direct manipulation of the Registry using the REGEDIT command At the end of this lab, you ll be able to Access the Registry using REGEDIT Export, import, and modify Registry data subkeys and values De ne the function of the ve top-level Registry keys

Once you open a file for reading, the next step is to read data from the file. Several Standard Library functions help you do just that. For starters, the function fgetc() reads a single character from a file s input buffer. Here s the function prototype:

100K-1M 3-30 MHz 01-09

int fgetc( FILE *fp );

The materials you need for this lab are A working computer running Windows 2000, Windows XP, or Windows Vista

The single parameter is the FILE pointer returned by fopen(). fgetc() reads a single character from the file and advances the file position pointer. If the file position pointer is already at the end of the file, fgetc() returns EOF.

char c; c = fgetc( fp );

works just fine. When the C compiler encounters two different types on each side of an assignment operator, it does its best to convert the value on the right side to the type of the left side before doing the assignment. As long as the type of the right side is no larger than the type of the left side (as is the case here: an int is at least as large as a char), this won t be a problem. We ll get into the specifics of typecasting in 11.

A technician needs to know how to access the Registry and modify the con guration based on solid support from Microsoft or other trusted sources As mentioned in the Learning Objectives, your main interface to the Registry is the Control Panel Changes made through the applets in the Control Panel result in modi cations to the Registry settings To see what s going on behind the scenes, though, you ll explore the Registry directly in this exercise using the REGEDIT command

1990-2000

The function fgets(), which we made use of in 9, reads a series of characters into an array of chars. Here s the function prototype:

char *fgets( char *s, int n, FILE *fp );

For more detail on the Windows Registry and working with REGEDIT and REGEDT32, refer to the Registry section in 4 of Mike Meyers CompTIA A+ Guide: Essentials

You should already be comfortable using fgets(). In our previous uses, we passed stdin as the third parameter to fgets(). As it turns out, stdin is a FILE pointer automatically provided to your program when it starts. In this chapter, we ll open a file with fopen() and use fgets() to read from the file. Here s an example:

*fp; buffer[ kMaxBufferSize ];