WM_CHAR Field - fsflags

fsflags (USHORT)

Keyboard control codes.

KC_CHAR

Indicates that usch value is valid.
KC_SCANCODE
Indicates that ucscancode is valid.

Generally, this is set in all WM_CHAR messages generated from actual operator input. However, if the message has been generated by an application that has issued the WinSetHook function to filter keystrokes, or posted to the application queue, this may not be set.

KC_VIRTUALKEY
Indicates that usvk is valid.

Normally usvk should be given precedence when processing the message.

Note: For those using hooks, when this bit is set, KC_SCANCODE should usually be set as well.

KC_KEYUP
The event is a key-up transition; otherwise it is a down transition.
KC_PREVDOWN
The key has been previously down; otherwise it has been previously up.
KC_DEADKEY
The character code is a dead key. The application is responsible for displaying the glyph for the dead key without advancing the cursor.
KC_COMPOSITE
The character code is formed by combining the current key with the previous dead key.
KC_INVALIDCOMP
The character code is not a valid combination with the preceding dead key. The application is responsible for advancing the cursor past the dead-key glyph and then, if the current character is not a space, sounding the alarm and displaying the new character code.
KC_LONEKEY
Indicates if the key is pressed and released without any other keys being pressed or released between the time the key goes down and up.
KC_SHIFT
The SHIFT state is active when key press or release occurred.
KC_ALT
The ALT state is active when key press or release occurred.
KC_CTRL
The CTRL state was active when key press or release occurred.

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