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_getch_nolock, _getwch_nolock

  • Straipsnis

Gets a character from the console without echo and without locking.

Important

This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported in Universal Windows Platform apps.

Syntax

int _getch_nolock( void );
wint_t _getwch_nolock( void );

Return value

Returns the character read. There's no error return.

Remarks

_getch_nolock and _getwch_nolock are identical to _getch and _getchw except that they not protected from interference by other threads. They might be faster because they don't 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.

By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.

Generic-text routine mappings

Tchar.h routine _UNICODE and _MBCS not defined _MBCS defined _UNICODE defined
_gettch_nolock _getch_nolock _getch_nolock _getwch_nolock

Requirements

Routine Required header
_getch_nolock <conio.h>
_getwch_nolock <conio.h> or <wchar.h>

For more compatibility information, see Compatibility.

Example

// crt_getch_nolock.c
// compile with: /c
// This program reads characters from
// the keyboard until it receives a 'Y' or 'y'.

#include <conio.h>
#include <ctype.h>

int main( void )
{
   int ch;

   _cputs( "Type 'Y' when finished typing keys: " );
   do
   {
      ch = _getch_nolock();
      ch = toupper( ch );
   } while( ch != 'Y' );

   _putch_nolock( ch );
   _putch_nolock( '\r' );    // Carriage return
   _putch_nolock( '\n' );    // Line feed
}

abcdefy

Type 'Y' when finished typing keys: Y

See also

Console and port I/O
_getche, _getwche
_cgets, _cgetws
getc, getwc
_ungetch, _ungetwch, _ungetch_nolock, _ungetwch_nolock