Message Map for Navigation Controls

Navigation controls communicate with the Windows CE operating system by sending messages. An OEM provides the driver that links each control with WM_KEYUP and WM_KEYDOWN messages individually or in a series. Each message has a virtual key message in its wParam parameter. The driver starts when the user presses a navigation control. The driver then sends the window messages to the device shell, which in turn shell passes the messages to the current application.

Direction keys each send a pair of WM_KEYDOWN and WM_KEYUP messages when held down. The driver continues sending these pairs for each auto-repeat, until the user releases the key. The Action key sends a pair of WM_KEYDOWN messages with VK_23 first followed by VK_RETURN when pressed, and a pair of WM_KEYUP message with VK_RETURN first followed by VK_23 when released.

The messages for each operation on a control are sent in the order listed in table.

Note   This example may not be consistent with the driver installed on your target device.

Operation on control	Messages	wParam
Press Action key	WM_KEYDOWN WM_KEYDOWN	VK_F23 VK_RETURN
Release Action key	WM_KEYUP WM_KEYUP	VK_RETURN VK_F23
Press Up control	WM_KEYDOWN	VK_UP
Hold down Up control	WM_KEYDOWN WM_KEYUP	VK_PRIOR VK_PRIOR
Release Up control	WM_KEYUP	VK_UP
Press Down control	WM_KEYDOWN	VK_DOWN
Hold down Down control	WM_KEYDOWN WM_KEYUP	VK_NEXT VK_NEXT
Release Down control	WM_KEYUP	VK_DOWN
Press App 1	WM_KEYDOWN WM_KEYDOWN	VK_LWIN 0xC1
Release App 1	WM_KEYUP WM_KEYUP	VK_LWIN 0xC1
Press App 2	WM_KEYDOWN WM_KEYDOWN	VK_LWIN 0xC2
Release App 2	WM_KEYUP WM_KEYUP	VK_LWIN 0xC2
Press App 3	WM_KEYDOWN WM_KEYDOWN	VK_LWIN 0xC3
Release App 3	WM_KEYUP WM_KEYUP	VK_LWIN 0xC3
Press App 4	WM_KEYDOWN WM_KEYDOWN	VK_LWIN 0xC4
Release App 4	WM_KEYUP WM_KEYUP	VK_LWIN 0xC4

See Also

Navigation Keys

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