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There is a limit to the number of simultaneous open files. This limit is implemented as a #define, FOPEN_MAX, defined in the file <stdio.h>. At the time of this writing, FOPEN_MAX was defined to be 20.
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If fopen() does open the file, it will allocate the memory for a FILE struct, and fp will point to that struct. We can then pass fp to routines that read from the file. Once we re done with the file, we ll pass fp to the function fclose():
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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
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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().
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Reading a File
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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:
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int fgetc( FILE *fp );
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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.
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CHAPTER 10: Working with Files
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USING A CHAR TO CATCH AN INT
Though fgetc() returns an int, a line like this
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.
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 );
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:
#define kMaxBufferSize FILE char 200
*fp; buffer[ kMaxBufferSize ];
if ( (fp = fopen( "My Data File", "r")) == NULL ) { printf( "File doesn't exist!!!\n" ); exit(1); } if ( fgets( buffer, kMaxBufferSize, fp ) == NULL ) { if ( feof( fp ) ) printf( "End-of-file!!!\n" ); else printf( "Unknown error!!!\n" ); } else printf( "File contents: %s\n", buffer );
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