用keybd_event 给分给分给分给分给分给分给分给分给分给分给分给分给分给分给分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 ); ParametersbVkSpecifies a virtual-key code. The code must be a value in the range 1 to 254. bScanSpecifies a hardware scan code for the key. dwFlagsA 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. dwExtraInfoSpecifies an additional 32-bit value associated with the key stroke. Return ValuesThis function has no return value. ResAlthough 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 AlsoGetAsyncKeyState, GetKeyState, MapVirtualKey, SetKeyboardState
BYTE bScan, // hardware scan code
DWORD dwFlags, // flags specifying various function options
DWORD dwExtraInfo // additional data associated with keystroke
);
ParametersbVkSpecifies a virtual-key code. The code must be a value in the range 1 to 254. bScanSpecifies a hardware scan code for the key. dwFlagsA 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.
dwExtraInfoSpecifies an additional 32-bit value associated with the key stroke. Return ValuesThis function has no return value. ResAlthough 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 AlsoGetAsyncKeyState, GetKeyState, MapVirtualKey, SetKeyboardState