MapVirtualKey info  Overview  Group

The MapVirtualKey function translates (maps) a virtual-key code into a scan code or character value, or translates a scan code into a virtual-key code.

UINT MapVirtualKey(

UINT uCode,	// virtual-key code or scan code
UINT uMapType	// translation to perform
);

Parameters

uCode

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

uMapType

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

Value	Meaning
0	uCode 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.
1	uCode 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.
2	uCode 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.
3	uCode 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.

Return Values

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

An application can use MapVirtualKey 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 MapVirtualKey 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, and MapVirtualKey functions.

See Also

GetAsyncKeyState, GetKeyboardState, GetKeyState, SetKeyboardState