_getchar_nolock, _getwchar_nolock

Article
06/05/2017

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The latest version of this topic can be found at _getchar_nolock, _getwchar_nolock.

Reads a character from standard input.

Syntax

int _getchar_nolock( void );  
wint_t _getwchar_nolock( void );

Return Value

See getchar, getwchar.

Remarks

_getchar_nolock and _getwchar_nolock are identical to getchar and getwchar except that they are not protected from interference by other threads. 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
`_gettchar_nolock`	`_getchar_nolock`	`_getchar_nolock`	`_getwchar_nolock`

Requirements

Routine	Required header
`_getchar_nolock`	<stdio.h>
`_getwchar_nolock`	<stdio.h> or <wchar.h>

The console is not supported in Windows 8.x Store apps. The standard stream handles that are associated with the console—stdin, stdout, and stderr—must be redirected before C run-time functions can use them in Windows 8.x Store apps. For more compatibility information, see Compatibility.

Example

// crt_getchar_nolock.c  
// Use _getchar_nolock to read a line from stdin.   
  
#include <stdio.h>  
  
int main()  
{  
    char buffer[81];  
    int i, ch;  
  
    for (i = 0; (i < 80) && ((ch = _getchar_nolock()) != EOF)  
                         && (ch != '\n'); i++)  
    {  
        buffer[i] = (char) ch;  
    }  
  
    // Terminate string with a null character   
  
    buffer[i] = '\0';  
    printf( "Input was: %s\n", buffer);  
}

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