GetKeyNameTextA function (winuser.h)

Retrieves a string that represents the name of a key.


int GetKeyNameTextA(
  [in]  LONG  lParam,
  [out] LPSTR lpString,
  [in]  int   cchSize


[in] lParam

Type: LONG

The second parameter of the keyboard message (such as WM_KEYDOWN) to be processed. The function interprets the following bit positions in the lParam.

Bits Meaning
16-23 The scan code. The value depends on the OEM.
24 Indicates whether the key is an extended key, such as the right-hand ALT and CTRL keys that appear on an enhanced 101- or 102-key keyboard. The value is 1 if it is an extended key; otherwise, it is 0.
25 "Do not care" bit. The application calling this function sets this bit to indicate that the function should not distinguish between left and right CTRL and SHIFT keys, for example.

For more detail, see Keystroke Message Flags.

[out] lpString


The buffer that will receive the key name.

[in] cchSize

Type: int

The maximum length, in characters, of the key name, including the terminating null character. (This parameter should be equal to the size of the buffer pointed to by the lpString parameter.)

Return value

Type: int

If the function succeeds, a null-terminated string is copied into the specified buffer, and the return value is the length of the string, in characters, not counting the terminating null character.

If the function fails, the return value is zero. To get extended error information, call GetLastError.


The format of the key-name string depends on the current keyboard layout. The keyboard driver maintains a list of names in the form of character strings for keys with names longer than a single character. The key name is translated according to the layout of the currently installed keyboard, thus the function may give different results for different input locales. The name of a character key is the character itself. The names of dead keys are spelled out in full.


The winuser.h header defines GetKeyNameText as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header winuser.h (include Windows.h)
Library User32.lib
DLL User32.dll

See also

Keyboard Input