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"r" "w" "a" Table 8-5
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Open a file for reading (Opened as text file by default, see discussion) Create a file for writing (Opened as text file by default, see discussion) Append to a file (Opened as text file by default, see discussion)
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The Legal Values for mode
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"rb" "wb" "ab" "r+" "w+" "a+" "r+b" "w+b" "a+b" "rt" "wt" "at" "r+t" "w+t" "a+t" Table 8-5
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Open a binary file for reading Create a binary file for writing Append to a binary file Open a file for read/write (Open as text file by default, see discussion) Create a file for read/write (Open as text file by default, see discussion) Append or create a file for read/write (Open as text file by default, see discussion) Open a binary file for read/write Create a binary file for read/write Append or create a binary file for read/write Open a text file for reading Create a text file for writing Append to a text file Open a text file for read/write Create a text file for read/write Append or create a text file for read/write
THE FOUNDATION OF C++
The Legal Values for mode (continued)
If you wish to open a file for writing with the name test, write:
FILE *fp; fp = fopen("test", "w");
Here, fp is a variable of type FILE * However, you usually see it written like this:
FILE *fp; if((fp = fopen("test", "w"))==NULL) { printf("Cannot open file\n");
Borland C++ Builder: The Complete Reference
exit(1); }
This method will detect any error in opening a file, such as a write-protected or full disk, before your program attempts to write to it In general, you will always want to make sure that fopen( ) succeeded before attempting any other operations on the file If you use fopen( ) to open a file for output, then any preexisting file by that name will be destroyed and a new file will be created If no file by that name exists, then one is created If you want to add to the end of the file, you must use a (append) mode If the file does not exist, it will be created Opening a file for read operations requires an existing file If no file exists, an error is returned If a file is opened for read/write operations it is not erased if it exists; if no file exists, one is created
Writing a Character
int putc(int ch, FILE *fp);
where fp is the file pointer returned by fopen( ) and ch is the character to be output The file pointer tells putc( ) which disk file to write to For historical reasons, ch is defined as an int, but only the low-order byte is used If a putc( ) operation is a success, it returns the character written If putc( ) fails, an EOF is returned
Reading a Character
There are also two equivalent functions that input a character: getc( ) and fgetc( ) Both are defined to preserve compatibility with older versions of C This book uses getc( ) (which is actually implemented as a macro), but you can use fgetc( ) if you like The getc( ) function is used to read characters from a stream opened in read mode by fopen( ) The prototype is int getc(FILE *fp); where fp is a file pointer of type FILE returned by fopen( ) For historical reasons, getc( ) returns an integer, but the high-order byte is 0 The getc( ) function returns an EOF when the end of the file has been reached, or if an error occurs To read a text file to the end, you could use the following code:
AM FL Y
The C I/O system defines two equivalent functions that output a character: putc( ) and fputc( ) (Actually, putc( ) is implemented as a macro) There are two identical functions simply to preserve compatibility with older versions of C This book uses putc( ), but you can use fputc( ) if you like The putc( ) function is used to write characters to a stream that was previously opened for writing using the fopen( ) function The prototype for putc( ) is
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