_getw

Remonter à Stdio.h - Index

Header File

stdio.h

Category

Input/output Routines

Prototype

int _getw(FILE *stream);

Description

Gets an integer from stream.

_getw returns the next integer in the named input stream. It assumes no special alignment in the file.

_getw should not be used when the stream is opened in text mode.

Return Value

_getw returns the next integer on the input stream.

On end-of-file or error, _getw returns EOF.

Remarque :  Because EOF is a legitimate value for _getw to return, feof or ferror should be used to detect end-of-file or error.

Example

 #include <stdio.h>
 #include <stdlib.h>
 #define FNAME "test.$$$"
 int main(void)
 {
 FILE *fp;
 int word;
 /* place the word in a file */
 fp = fopen(FNAME, "wb");
 if (fp == NULL)
 {
 printf("Error opening file %s\n", FNAME);
       exit(1);
    }
    word = 94;
    putw(word,fp);
    if (ferror(fp))
        printf("Error writing to file\n");
    else
        printf("Successful write\n");
    fclose(fp);
    /* reopen the file */
    fp = fopen(FNAME, "rb");
    if (fp == NULL)
    {
       printf("Error opening file %s\n", FNAME);
       exit(1);
    }
    /* extract the word */
    word = getw(fp);
    if (ferror(fp))
        printf("Error reading file\n");
    else
        printf("Successful read: word = %d\n", word);
    /* clean up */
    fclose(fp);
    unlink(FNAME);
    return 0;
 }

Portability

POSIX	Win32	ANSI C	ANSI C++
	+