Tóm Tắt

`_getch`, `_getwch`

Bài viết
08/03/2021
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Gets a character from the console without echo.

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( void );
wint_t _getwch( void );

Return Value

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

Remarks

The _getch and _getwch functions read a single character from the console without echoing the character. None of these functions can be used to read CTRL+C. When reading a function key or an arrow key, each function must be called twice; the first call returns 0 or 0xE0, and the second call returns the actual key code.

These functions lock the calling thread and are therefore thread-safe. For non-locking versions, see _getch_nolock, _getwch_nolock.

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

Generic-Text Routine Mappings

Tchar.h routine
_UNICODE and _MBCS not defined
_MBCS defined
_UNICODE defined

_gettch
_getch
_getch
_getwch

Requirements

Routine
Required header

_getch
<conio.h>
_getwch
<conio.h> or <wchar.h>

For more compatibility information, see Compatibility.

Example

// crt_getch.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();
      ch = toupper( ch );
   } while( ch != 'Y' );

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

abcdefy

Type 'Y' when finished typing keys: Y

_getch, _getwch