_getc_nolock, _getwc_nolock

مقالة
06/30/2010

Reads a character from a stream.

int _getc_nolock( 
   FILE *stream 
);
wint_t _getwc_nolock( 
   FILE *stream 
);

Parámetros

stream
Input stream.

Valor devuelto

See getc, getwc.

Comentarios

These functions are identical to getc and getwc except that they do not lock the calling thread. They might be faster because they do not incur the overhead of locking out other threads. Use these functions only in thread-safe contexts such as single-threaded applications or where the calling scope already handles thread isolation.

Generic-Text Routine Mappings

Tchar.h routine	_UNICODE and _MBCS not defined	_MBCS defined	_UNICODE defined
_gettc_nolock	getc_nolock	getc_nolock	getwc_nolock

Requisitos

Routine	Required header
getc_nolock	<stdio.h>
getwc_nolock	<stdio.h> or <wchar.h>

For more compatibility information, see Compatibility in the Introduction.

Ejemplo

// crt_getc_nolock.c
// Use getc to read a line from a file.  #include <stdio.h>

int main()
{
    char buffer[81];
    int i, ch;
    FILE* fp;
    
    // Read a single line from the file "crt_getc_nolock.txt".  fopen_s(&fp, "crt_getc_nolock.txt", "r");
    if (!fp)
    {
       printf("Failed to open file crt_getc_nolock.txt.  \n");
       exit(1);
    }

    for (i = 0; (i < 80) && ((ch = getc(fp)) != EOF)
                         && (ch != '\n'); i++)
    {
        buffer[i] = (char) ch;
    }
       
    // Terminate string with a null character 
    buffer[i] = '\0';
    printf( "Input was: %s\n", buffer);

    fclose(fp);
}