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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| user32.lib
| Header File
| winuser.h
| Unicode
| No
| Platform Notes
| None
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keybd_event
The keybd_event function synthesizes a keystroke. The system can use such a synthesized
keystroke to generate a WM_KEYUP or WM_KEYDOWN message. The keyboard driver's interrupt handler calls the keybd_event function.
VOID keybd_event(
BYTE bVk,
| // virtual-key code
| BYTE bScan,
| // hardware scan code
| DWORD dwFlags,
| // flags specifying various function options
| DWORD dwExtraInfo
| // additional data associated with keystroke
| );
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Parameters
bVk
Specifies a virtual-key code. The code must be a value in the range 1 to 254.
bScan
Specifies a hardware scan code for the key.
dwFlags
A set of flag bits that specify various aspects of function operation. An
application can use any combination of the following predefined constant values to
set the flags:
Value
| Meaning
| KEYEVENTF_EXTENDEDKEY
| If specified, the scan code was preceded by a prefix byte having the value
0xE0 (224).
| KEYEVENTF_KEYUP
| If specified, the key is being released. If not specified, the key is being
depressed.
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dwExtraInfo
Specifies an additional 32-bit value associated with the key stroke.
Return Values
This function has no return value.
Remarks
Although keybd_event passes an OEM-dependent hardware scan code to Windows, applications should
not use the scan code. Windows converts scan codes to virtual-key codes
internally and clears the up/down bit in the scan code before passing it to
applications.
An application can simulate a press of the PRINTSCREEN key in order to obtain
a screen snapshot and save it to the Windows clipboard. To do this, call keybd_event with the bVk parameter set to VK_SNAPSHOT, and the bScan parameter set to 0 for a snapshot of the full screen or set bScan to 1 for a snapshot of the active window.
See Also
GetAsyncKeyState, GetKeyState, MapVirtualKey, SetKeyboardState
Related Links
Software for Delphi and C++ Builder developers
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Software for Visual Basic 6 developers
Delphi Tips&Tricks
MegaDetailed.NET
More Online Helps
Win32 Multimedia Programmer's Reference (mmedia.hlp)
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Microsoft Windows Telephony API (TAPI) Programmer's Reference (tapi.hlp)
Unix Manual Pages
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