Using Delphi to simulate keyboard input

In the big line of Windows today, Windows interface program by the majority of users welcome. There are two kinds of operation for these programs, keyboard input control and mouse input control. Sometimes, for complex, or repetitive operations, can we compile programs instead of manual input and use programs to simulate keyboard and mouse input? The answer is yes. This is achieved primarily through two API functions.

The following is an example of Delphi to explain how to achieve these two functions. Analog keyboard We use Keybd_event This API function, simulates the mouse button with the Mouse_event function. You don't have to worry about it, it's convenient to call the API function in Delphi.

Let's introduce the keybd_event function. Keybd_event can trigger a keystroke event, which means that a wm_keydown or WM_KEYUP message is generated back. Of course, the two messages can be used to simulate the keys, but not directly with this function convenient. Keybd_event A total of four parameters, the first key is the virtual key value, such as the ENTER key is Vk_return, tab is Vk_tab. The second parameter is a scan code, usually not set, with 0 instead of the line. The third parameter is the option flag, if the KeyDown is 0, if the KEYUP is set to "Keyeventf_keyup", the fourth parameter is generally 0. The following code can be implemented to simulate pressing the I key, wherein the $49 represents the I key virtual key value:

keybd_event ($49,0,0,0);

keybd_event ($49,0,keyeventf_keyup,0); ...

　　

Mouse_event preferably with the Setcursorpos (x, y) function, similar to keybd_event, Mouse_event has five parameters, the first is the option flag, the Mouseeventf_leftdown when the left key is pressed, the Mouseeventf_leftup indicates that the left button is released and sends the appropriate message to the system. The 23rd parameter represents x, Y relative position, can be set to 0, 0, 45th parameter is not important, generally can also be set to 0, 0. To get more detailed usage of the keybd_event and mouse_event functions, you can consult the MSDN or Delphi Help. Here's a sample code for Mouse_event:

　

Setcursorpos (20,132);

Mouse_event (mouseeventf_leftdown,0,0,0,0);

Mouse_event (mouseeventf_leftup,0,0,0,0);

Mouse_event (mouseeventf_leftdown,0,0,0,0);

Mouse_event (mouseeventf_leftup,0,0,0,0); ...

The above code indicates a double-click of the mouse, to indicate that you clicked, with two mouse_event (one drop, one release at a time).

Note, whether it is the simulation keyboard or mouse events, you should pay attention to restore, that is, press the key to release, a KeyDown corresponding to a keyup; Click the mouse to release, or it may affect the function of the program.

The analog keyboard input first uses an API function: keybd_event.
We are rookie, so do not have to specifically understand its detailed usage, as long as the following methods to use it! Oh!
The analog button has two basic actions, namely pressing the key and releasing the key, so we call the API function twice each time we simulate the button, the method is:
　　
Example 1: Simulate pressing the ' A ' key
keybd_event (65,0,0,0);
keybd_event (65,0,keyeventf_keyup,0);

Example 2: Analog Press the ' ALT+F4 ' key
keybd_event (18,0,0,0);
keybd_event (115,0,0,0);
keybd_event (115,0,keyeventf_keyup,0);
keybd_event (18,0,keyeventf_keyup,0);

Attached: Key value comparison table of common analog keys.

Keyboard key and Virtual key code comparison table

Keys for alphanumeric keypad key function keys other keys
Key code key keys key code keys key code
A 0 F1 Backspace 8
B 1 F2 113 Tab 9
C 2 98 F3 Clear 12
D-3 F4-13
E 4 F5-Shift 16
F 5 101 F6 117 Control 17
G 6 102 F7 118 Alt 18
H 7 103 F8 119 caps Lock 20
I 8 104 F9 27 ESC
J 9 F10 121 Spacebar 32
K * 106 F11 122 Page up 33
L + 107 F12 123 Page down 34
M + Enter 108----End 35
N 78-109----Home 36
O 79. ----left Arrow 37
P 80/111----up Arrow 38
Q Bayi--------Right Arrow 39
R--------down Arrow 40
S---------Insert 45
T--------Delete 46
U---------help 47
V--------Num Lock 144
W 87
X 88
Y 89
Z 90
0 48
1 49
2 50
3 51
4 52
5 53
6 54
7 55
8 56
9 57

　

Well, I hope this article will let you have a preliminary understanding of the keyboard and mouse buttons, if you want to know more about the mystery, you can check the detailed MSDN online Help, and a lot of hands-on practice.

Attached: A more detailed list of key values:

Constant name	Hexadecimal value	Decimal value	corresponding keys
Vk_lbutton	01	1	The left mouse button
Vk_rbutton	02	2	The right mouse button
Vk-cancel	03	3	Ctrl+break (usually no processing required)
Vk_mbutton	04	4	Middle mouse button (three-button mouse)
Vk_back	08	8	Backspace key
Vk_tab	09	9	TAB key
Vk_clear	0C	12	Clear key (number pad when Num lock is off 5)
Vk_return	0D	13	Enter key
Vk_shift	10	16	Shift key
Vk_control	11	17	CTRL key
Vk_menu	12	18	ALT key
Vk_pause	13	19	Pause key
Vk_capital	14	20	Caps Lock key
Vk_escape	1 b	27	ESE key
Vk_space	20	32	SPACEBAR key
Vk_prior	21st	33	Page up key
Vk_next	22	34	Page DOMW Key
Vk_end	23	35	End key
Vk_home	24	36	Home key
Vk_left	25	37	Left ARROW key (←)
Vk_up	26	38	Up ARROW key (↑)
Vk_right	27	39	Right ARROW key (→)
Vk_down	28	40	Down ARROW key (↓)
Vk_select	29	41	Select key
Vk_print	2 A	42
Vk_execute	2 b	43	Execute key
Vk_snapshot	2 C	44	Print screen key (capture)
Vk_insert	The	45	Ins key (number pad when Num lock is off 0)
Vk_delete	2E	46	Del key (number pad when Num lock is off).
Vk_help	2F	47	Help key
Vk_0	30	48	0 keys
Vk_1	31	49	1 keys
Vk_2	32	50	2 keys
Vk_3	33	51	3 keys
Vk_4	34	52	4 keys
Vk_5	35	53	5 keys
Vk_6	36	54	6 keys
Vk_7	37	55	7 keys
Vk_8	38	56	8 keys
Vk_9	39	57	9 keys
Vk_a	41	65	A key
Vk_b	42	66	B Key
Vk_c	43	67	C Key
Vk_d	44	68	D Key
Vk_e	45	69	E key
Vk_f	46	70	F key
Vk_g	47	71	G Key
Vk_h	48	72	H key
Vk_i	49	73	I key
Vk_j	4 A	74	J Key
Vk_k	4 b	75	K Key
vk_l	4C	76	L Key
Vk_m	4D	77	M key
Vk_n	4E	78	N Key
Vk_o	4F	79	O Key
Vk_p	50	80	P Key
Vk_q	51	81	Q Key
Vk_r	52	82	R key
vk_s	53	83	S key
vk_t	54	84	T key
Vk_u	55	85	U key
Vk_v	56	86	V Key
Vk_w	57	87	W Key
Vk_x	58	88	X key
Vk_y	59	89	Y key
Vk_z	5 A	90	Z Key
Vk_numpad0	60	96	Number keys 0 keys
Vk_numpad1	61	97	Number keys 1 keys
Vk_numpad2	62	98	Number keys 2 keys
Vk_numpad3	62	99	Number keys 3 keys
Vk_numpad4	64	100	Number keys 4 keys
Vk_numpad5	65	101	Number keys 5 keys
Vk_numpad6	66	102	Number keys 6 keys
Vk_numpad7	67	103	Number keys 7 keys
Vk_numpad8	68	104	Number keys 8 keys
Vk_numpad9	69	105	Number keys 9 keys
Vk_multiply	6A	106	The * key on the numeric keypad
Vk_add	6B	107	The + key on the numeric keypad
Vk_separator	6C	108	Separator key
Vk_subtract	6D	109	The-key on the numeric keypad
Vk_decimal	6E	110	The. Key on the numeric keypad
Vk_divide	6F	111	/keys on the numeric keypad
Vk_f1	70	112	F1 Key
Vk_f2	71	113	F2 Key
Vk_f3	72	114	F3 Key
Vk_f4	73	115	F4 Key
Vk_f5	74	116	F5 Key
Vk_f6	75	117	F6 Key
Vk_f7	76	118	F7 Key
Vk_f8	77	119	F8 Key
Vk_f9	78	120	F9 Key
Vk_f10	79	121	F10 Key
Vk_f11	7A	122	F11 Key
Vk_f12	7B	123	F12 Key
Vk_numlock	90	144	Num Lock Key
Vk_scroll	91	145	Scroll Lock key
Not mentioned above: (both on the big keyboard)
Vk_lwin		91	Left Win key
Vk_rwin		92	Right Win key
Vk_apps		93	Right Ctrl left button, click the equivalent right mouse button, will pop up the shortcut menu
		186	;(semicolon)
		187	= key
		188	, key (comma)
		189	-Key (minus)
		190	. Key (Period)
		191	/Key
		192	' Key (ESC below)
		219	[Key
		220	\ Key
		221	] Key
		222	' Key (quotation marks)

Delphi Virtual Key Correspondence key

Vk_lbutton left mouse button

Vk_rbutton right mouse button

Vk_cancel Control + Rest

Vk_mbutton Middle mouse button

Vk_back backspace key

Vk_tab TAB Key

Vk_clear Clear the main

Vk_return Enter key

Vk_shift SHIFT Key

Vk_control CTRL key

Vk_menu ALT key

Vk_pause Pause Key

Vk_capital CAPS LOCK key

Vk_kana can be used with input method

Vk_hangul can be used with input method

Vk_junja can be used with input method

Vk_final can be used with input method

Vk_hanja can be used with input method

Vk_kanji can be used with input method

Vk_convert can be used with input method

Vk_nonconvert can be used with input method

Vk_accept can be used with input method

Vk_modechange can be used with input method

Vk_escape ESC key

Vk_space Space Bar

Vk_prior Page Key

Vk_next Next Page key

Vk_end END Key

Vk_home Homepage Key

Vk_left LEFT ARROW key

Vk_up up key

Vk_right RIGHT ARROW key

Vk_down DOWN ARROW key

Vk_select Selection Key

Vk_print Print key (keyboard specific)

Vk_execute Execution Key

Vk_snapshot Print Screen Key

Vk_insert Insertion Key

Vk_delete DELETE Key

Vk_help Help Key

Vk_lwin left Windows key (Microsoft Keyboard)

Vk_rwin right Windows key (Microsoft Keyboard)

Vk_apps Application key (Microsoft Keyboard)

Vk_numpad0 0 keys (numeric keypad)

Vk_numpad1 1 keys (numeric keypad)

Vk_numpad2 2 keys (numeric keypad)

Vk_numpad3 3 keys (numeric keypad)

VK_NUMPAD4 4 keys (numeric keypad)

VK_NUMPAD5 5 keys (numeric keypad)

VK_NUMPAD6 6 keys (numeric keypad)

Vk_numpad7 7 keys (numeric keypad)

Vk_numpad8 8 keys (numeric keypad)

VK_NUMPAD9 9 keys (numeric keypad)

Vk_multiply Multi-key (numeric keypad)

Vk_add add key (numeric keypad)

Vk_separator Separator key (numeric keypad)

Vk_subtract minus key (numeric keypad)

Vk_decimal decimal key (numeric keypad)

Vk_divide divide key (numeric keypad)

VK_F1 F1 Key

VK_F2 F2 Key

The key to Vk_f3 F3

Vk_f4 F4 Key

Vk_f5 F5 Key

Vk_f6 F6 Key

Vk_f7 F7 Key

Vk_f8 F8 Key

VK_F9 F9 Key

VK_F10 Key of F10 key

VK_F11 F11 Key

VK_F12 F12 Key

Vk_f13 F13 Key

Vk_f14 F14 Key

VK_F15 F15 Key

VK_F16 F16 Key

Vk_f17 F17 Key

Vk_f18 F18 Key

Vk_f19 F19 Key

Vk_f20 F20 Key

VK_F21 F21 Key

Vk_f22 F22 Key

Vk_f23 F23 Key

Vk_f24 F24 Key

Vk_numlock Number of lock keys

Vk_scroll SCROLL LOCK key

Vk_lshift left Shift key (for getasynckeystate and getkeystate only)

Vk_rshift Right SHIFT key (for getasynckeystate and getkeystate only)

Vk_lcontrol Left CTRL key (for Getasynckeystate and getkeystate only)

Vk_rcontrol Right CTRL key (for Getasynckeystate and getkeystate only)

Vk_lmenu left ALT key (for getasynckeystate and getkeystate only)

Vk_rmenu Right ALT key (for getasynckeystate and getkeystate only)

Vk_processkey Process Key

VK_ATTN Handling Key

Vk_crsel Crsel Key

Vk_exsel Exsel Key

Vk_ereof Erase EOF Analysis key

Vk_play Play the key

Vk_zoom Zoom Key

Vk_noname reserved for future use

VK_PA1 PA1 Key

Vk_oem_clear clear number of primary Tags: 1 "F14 key

VK_F15 F15 Key

VK_F16 F16 Key

Vk_f17 F17 Key

Vk_f18 F18 Key

Vk_f19 F19 Key

Vk_f20 F20 Key

VK_F21 F21 Key

Vk_f22 F22 Key

Vk_f23 F23 Key

Vk_f24 F24 Key

Vk_numlock Number of lock keys

Vk_scroll SCROLL LOCK key

Vk_lshift left Shift key (for getasynckeystate and getkeystate only)

Vk_rshift Right SHIFT key (for getasynckeystate and getkeystate only)

Vk_lcontrol Left CTRL key (for Getasynckeystate and getkeystate only)

Vk_rcontrol Right CTRL key (for Getasynckeystate and getkeystate only)

Vk_lmenu left ALT key (for getasynckeystate and getkeystate only)

Vk_rmenu Right ALT key (for getasynckeystate and getkeystate only)

Vk_processkey Process Key

VK_ATTN Handling Key

Vk_crsel Crsel Key

Vk_exsel Exsel Key

Vk_ereof Erase EOF Analysis key

Vk_play Play the key

Vk_zoom Zoom Key

Vk_noname reserved for future use

VK_PA1 PA1 Key

Vk_oem_clear Clear the main

Using Delphi to simulate keyboard input