MapVirtualKeyEx function

Translates (maps) a virtual-key code into a scan code or character value, or translates a scan code into a virtual-key code. The function translates the codes using the input language and an input locale identifier.

Syntax

UINT WINAPI MapVirtualKeyEx(
  _In_        UINT uCode,
  _In_        UINT uMapType,
  _Inout_opt_ HKL  dwhkl
);

Parameters

uCode [in]

Type: UINT

The virtual-key code or scan code for a key. How this value is interpreted depends on the value of the uMapType parameter.

Starting with Windows Vista, the high byte of the uCode value can contain either 0xe0 or 0xe1 to specify the extended scan code.

uMapType [in]

Type: UINT

The translation to perform. The value of this parameter depends on the value of the uCode parameter.

Value	Meaning
MAPVK_VK_TO_CHAR 2	The uCode parameter is a virtual-key code and is translated into an unshifted character value in the low order word of the return value. Dead keys (diacritics) are indicated by setting the top bit of the return value. If there is no translation, the function returns 0.
MAPVK_VK_TO_VSC 0	The uCode parameter is a virtual-key code and is translated into a scan code. If it is a virtual-key code that does not distinguish between left- and right-hand keys, the left-hand scan code is returned. If there is no translation, the function returns 0.
MAPVK_VK_TO_VSC_EX 4	The uCode parameter is a virtual-key code and is translated into a scan code. If it is a virtual-key code that does not distinguish between left- and right-hand keys, the left-hand scan code is returned. If the scan code is an extended scan code, the high byte of the uCode value can contain either 0xe0 or 0xe1 to specify the extended scan code. If there is no translation, the function returns 0.
MAPVK_VSC_TO_VK 1	The uCode parameter is a scan code and is translated into a virtual-key code that does not distinguish between left- and right-hand keys. If there is no translation, the function returns 0.
MAPVK_VSC_TO_VK_EX 3	The uCode parameter is a scan code and is translated into a virtual-key code that distinguishes between left- and right-hand keys. If there is no translation, the function returns 0.

 

dwhkl [in, out, optional]

Type: HKL

Input locale identifier to use for translating the specified code. This parameter can be any input locale identifier previously returned by the LoadKeyboardLayout function.

Return value

Type: UINT

The return value is either a scan code, a virtual-key code, or a character value, depending on the value of uCode and uMapType. If there is no translation, the return value is zero.

Remarks

The input locale identifier is a broader concept than a keyboard layout, since it can also encompass a speech-to-text converter, an Input Method Editor (IME), or any other form of input.

An application can use MapVirtualKeyEx to translate scan codes to the virtual-key code constants VK_SHIFT, VK_CONTROL, and VK_MENU, and vice versa. These translations do not distinguish between the left and right instances of the SHIFT, CTRL, or ALT keys.

An application can get the scan code corresponding to the left or right instance of one of these keys by calling MapVirtualKeyEx with uCode set to one of the following virtual-key code constants.

• VK_LSHIFT
• VK_RSHIFT
• VK_LCONTROL
• VK_RCONTROL
• VK_LMENU
• VK_RMENU

These left- and right-distinguishing constants are available to an application only through the GetKeyboardState, SetKeyboardState, GetAsyncKeyState, GetKeyState, MapVirtualKey, and MapVirtualKeyEx functions. For list complete table of virtual key codes, see Virtual Key Codes.

Requirements

See also

Reference

GetAsyncKeyState

GetKeyboardState

GetKeyState

LoadKeyboardLayout

SetKeyboardState

Conceptual

Keyboard Input