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Creating Quick Response Code in Software Page 313

Page 313
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#include <stdioh> int feof(FILE *stream);
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The feof( ) function determines whether the end of the file associated with stream has been reached A nonzero value is returned if the file position indicator is at the end of the file; zero is returned otherwise Once the end of the file has been reached, subsequent read operations will return EOF until either rewind( ) is called or the file position indicator is moved using fseek( ) The feof( ) function is particularly useful when working with binary files because the end-of-file marker is also a valid binary integer Explicit calls must be made to feof( ) rather than simply testing the return value of getc( ), for example, to determine when the end of a binary file has been reached Example This code fragment shows one way to read to the end of a file:
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/* Assume that fp has been opened for read operations */ while(!feof(fp)) getc(fp);
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Related Functions clearerr( ), ferror( ), perror( ), putc( ), and getc( ) ferror
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#include <stdioh> int ferror(FILE *stream);
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The ferror( ) function checks for a file error on the given stream A return value of zero indicates that no error has occurred, while a nonzero value means an error To determine the exact nature of the error, use the perror( ) function
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Example The following code fragment aborts program execution if a file error occurs:
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/* Assume that fp points to a stream opened for write operations */ while(!done) { putc(info, fp); if(ferror(fp)) { printf(''File Error\n"); exit(1); } }
Related Functions clearerr( ), feof( ), and perror( ) fflush
#include <stdioh> int fflush(FILE *stream);
If stream is associated with a file opened for writing, a call to fflush( ) causes the contents of the output buffer to be physically written to the file The file remains open A return value of zero indicates success; EOF indicates that a write error has occurred All buffers are automatically flushed upon normal termination of the program or when they are full Also, closing a file flushes its buffer Example The following code fragment flushes the buffer after each write operation:
/* Assume that fp is associated with an output file */
Page 315 for(i=0; i<MAX; i++) { fwrite(buf, sizeof(some_type), 1, fp); fflush(fp); }
Related Functions fclose( ), fopen( ), fread( ), fwrite( ), getc( ) , and putc( ) fgetc
#include <stdioh> int fgetc(FILE *stream);
The fgetc( ) function returns the next character from the specified input stream and increments the file position indicator The character is read as an unsigned char that is converted to an integer If the end of the file is reached, fgetc( ) returns EOF However, since EOF is a valid integer value, when working with binary files you must use feof( ) to check for the end of the file If fgetc( ) encounters an error, EOF is also returned If working with binary files, you must use ferror( ) to check for file errors Example The following program reads and displays the contents of a text file:
#include <stdioh> #include <stdlibh> int main(int argc, char *argv[]) { FILE *fp; char ch; if((fp=fopen(argv[1],"r"))==NULL) { printf(''Cannot open file\n"); exit(1); } while((ch=fgetc(fp)) != EOF) {
Page 316 printf("%c", ch); } fclose(fp); return 0; }
Related Functions fputc( ), getc( ), putc( ), and fopen( ) fgetpos
#include <stdioh> int fgetpos(FILE *stream, fpos_t *position);
For the specified stream, the fgetpos( ) function stores the current value of the file position indicator in the object pointed to by position The object pointed to by position must be of type fpos_t The value stored there is useful only in a subsequent call to fsetpos( ) In C99, both stream and position are qualified by restrict If an error occurs, fgetpos( ) returns nonzero; otherwise it returns zero Example The following fragment stores the current file location in file_loc:
FILE *fp; fpos_t file_loc; fgetpos(fp, &file_loc);
Related Functions fsetpos( ), fseek( ), and ftell( )
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