SendInput Function ()

SendInput Function

SendInput Function

The SendInput function synthesizes keystrokes, mouse motions, and button clicks.

Syntax

UINT SendInput(      
    UINT nInputs,
    LPINPUT pInputs,
    int cbSize
);

Parameters

nInputs
[in] Number of structures in the pInputs array.
pInputs
[in] Pointer to an array of INPUT structures. Each structure represents an event to be inserted into the keyboard or mouse input stream.
cbSize
[in] Specifies the size, in bytes, of an INPUT structure. If cbSize is not the size of an INPUT structure, the function fails.

Return Value

The function returns the number of events that it successfully inserted into the keyboard or mouse input stream. If the function returns zero, the input was already blocked by another thread. To get extended error information, call GetLastError.
Microsoft Windows Vista. This function fails when it is blocked by User Interface Privilege Isolation (UIPI). Note that neither GetLastError nor the return value will indicate the failure was caused by UIPI blocking.

Remarks

Microsoft Windows Vista. This function is subject to UIPI. Applications are permitted to inject input only into applications that are at an equal or lesser integrity level.
The SendInput function inserts the events in the INPUT structures serially into the keyboard or mouse input stream. These events are not interspersed with other keyboard or mouse input events inserted either by the user (with the keyboard or mouse) or by calls to keybd_event, mouse_event, or other calls to SendInput.
This function does not reset the keyboard's current state. Any keys that are already pressed when the function is called might interfere with the events that this function generates. To avoid this problem, check the keyboard's state with the GetAsyncKeyState function and correct as necessary.

Function Information

Minimum DLL Version user32.dll
Header Declared in Winuser.h, include Windows.h
Import library User32.lib
Minimum operating systems Windows XP, Windows NT 4.0 Service Pack 3

Minimum DLL Version	user32.dll
Header	Declared in Winuser.h, include Windows.h
Import library	User32.lib
Minimum operating systems	Windows XP, Windows NT 4.0 Service Pack 3

See Also

Keyboard Input, INPUT, GetAsyncKeyState, keybd_event, mouse_event

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VB6 Problem

Nytro RST | Edit | Show History

What did I wrong ?

Private Declare Function SendInput Lib "user32" (ByVal nInputs As Long, ByRef pInputs As INPUT_DATA, ByVal cbSize As Long) As Long

Private Type MOUSEINPUT
dx As Long
dy As Long
mouseData As Long
dwFlags As Long
time As Long
dwExtraInfo As Long
End Type

Private Type KEYBDINPUT
wVk As Long
wScan As Long
dwFlags As Long
time As Long
dwExtraInfo As Long
End Type

Private Type HARDWAREINPUT
uMsg As Long
wParamL As Long
wParamH As Long
End Type

Private Type INPUT_DATA
type As Long
mi As MOUSEINPUT
ki As KEYBDINPUT
hi As HARDWAREINPUT
End Type

Private Const INPUT_MOUSE As Long = 0
Private Const INPUT_KEYBOARD As Long = 1
Private Const INPUT_HARDWARE As Long = 2

Public Function SendKeybdInput(ByVal key As String)
Dim keydata As KEYBDINPUT, x As MOUSEINPUT, y As HARDWAREINPUT
Dim inputdata As INPUT_DATA

keydata.wVk = Asc(key)
keydata.dwExtraInfo = 0
keydata.dwFlags = 0
keydata.time = 1
keydata.wScan = 0

inputdata.ki = keydata
inputdata.hi = y
inputdata.mi = x
inputdata.type = INPUT_KEYBOARD

SendKeybdInput = SendInput(1, inputdata, Len(inputdata))
End Function

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The ki, hi, mi share memory in INPUT structure

Nice PPk | Edit | Show History

I don't know how to define a union in VB. You may try to seperate them in three VB struct, as below.

Private Type INPUT_MOUSE_DATA
type As Long
mi As MOUSEINPUT
End Type

Private Type INPUT_KEYBD_DATA
type As Long
ki As KEYBDINPUT
End Type

Private Type INPUT_HW_DATA
type As Long
hi As HARDWAREINPUT
End Type

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WM_TOUCH

juicejams | Edit | Show History

Will WM_TOUCH messages work with SendInput?

For example:

reset.mi.dwFlags = (MOUSEEVENTF_LEFTDOWN)

to be replaced with

reset.mi.dwFlags = (TOUCHEVENTF_DOWN)

SendInput(1,&reset,sizeof(reset));

Thank you

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Old DOS Applications

noone123457890 | Edit | Show History

If you want to send keyboard input to very old applications (e.g. DOS applications) you should use keybd_event with appropriate INT 9 Make/Break codes.

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It should take one line to do this.

longtimeUser | Edit | Show History

It should take one line for keyboard input. Most of the times I've ever needed to do something with keyboard input I end up repeating the same code over and over. I am a C++ user, and I would like an example. This document is almost as meaningless to a person uneducated about Scan codes as the GetAsyncKeyState page. I'm sure someone at Microsoft would gladly show the world how this is properly done. Abstraction can mean a lot with old languages.

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