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xmlns:o="urn:schemas-microsoft-com:office:office" |
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xmlns:w="urn:schemas-microsoft-com:office:word" |
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xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" |
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xmlns="http://www.w3.org/TR/REC-html40"> |
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Back to
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main |
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Function 2 -
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get the code of the pressed key |
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Takes the code of the pressed key from the buffer.
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lang=EN-US style='font-family:"Arial","sans-serif";mso-ansi-language:EN-US'> |
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Characteristic:
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*
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class=GramE>eax = 2 - the number of function |
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Returned value:
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* if
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the buffer is empty, eax=1 is returned |
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style='mso-spacerun:yes'> * if the buffer is not empty, al=0, ah=key |
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code is returned, bits 16-23 contain the ASCII mode code of the pressed key, |
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class=SpellE>scancodes in the mode indicator bits set to zero. Bits |
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23-31 are reset |
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* if there is a" hot
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key", it is returned al=2, ah=skankod of the |
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pressed key (0 for control keys), the highest word of the eax |
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register contains the state of the control keys when the hotkey is pressed |
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Comments:
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* There is a 120-byte system-wide keystroke buffer, organized as a |
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queue. |
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* There is another system-wide buffer of 120 "hot keys". |
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* When this function is called by an application with an inactive window |
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it is considered that a buffer of keys pressed is empty. |
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* By default, this function returns ASCII codes; switch to |
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class=SpellE>scancode mode (and back) using function 66. However, |
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hotkeys are always returned as scancodes. |
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* Find out which key combinations correspond to which codes, you |
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class=SpellE>can,by running the |
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class=SpellE>keyascii and scancode |
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applications. |
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* The codes are returned directly by the keyboard and are fixed; ASCII |
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codes are obtained using conversion tables, which can be set by sub-function 2 |
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functions 21 and read sub-function 2 functions 26. |
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* As a result, ASCII codes take into account the current keyboard layout |
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(rus / en) in contrast to the scancodes. |
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* Information is received only about the hot keys that have been |
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identified by this stream by sub-function 4 of function 66. |
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Constants for registers:
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class=GramE>eax-SF_GET_KEY (2) |
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