如何控制键盘上面的3 个灯的亮灭 （NUM LOCK ,CAPS LOCK SRCOLL LOCK)

[green221]

如何控制键盘上面的3 个灯的亮灭 （NUM LOCK ,CAPS LOCK SRCOLL LOCK)

[fbmsf]

msdn上有列子的


The documentation for SetKeyboardState() correctly says that you cannot use this API to toggle the NUM LOCK, CAPS LOCK, and SCROLL LOCK keys.

You can use keybd_event() to toggle the NUM LOCK, CAPS LOCK, and SCROLL LOCK keys under Windows NT. The same technique works for toggling CAPS LOCK and SCROLL LOCK under Windows 95, but it will not work for NUM LOCK.



MORE INFORMATION
The following sample program turns the NUM LOCK light on if it is off. The SetNumLock function defined here simulates pressing the NUM LOCK key, using keybd_event() with a virtual key of VK_NUMLOCK. It takes a boolean value that indicates whether the light should be turned off (FALSE) or on (TRUE).

The same technique can be used for the CAPS LOCK key (VK_CAPITAL) and the SCROLL LOCK key (VK_SCROLL).

Sample Code

/* Compile options needed:
*/

#include <windows.h>

void SetNumLock( BOOL bState )
{
BYTE keyState[256];

GetKeyboardState((LPBYTE)&keyState);
if( (bState && !(keyState[VK_NUMLOCK] & 1)) ||
(!bState && (keyState[VK_NUMLOCK] & 1)) )
{
// Simulate a key press
keybd_event( VK_NUMLOCK,
0x45,
KEYEVENTF_EXTENDEDKEY | 0,
0 );

// Simulate a key release
keybd_event( VK_NUMLOCK,
0x45,
KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP,
0);
}
}

void main()
{
SetNumLock( TRUE );
}

Additional query words:

[masterz]

//彻底控制三个LOCK键

// Scroll Lock
void CMy011130D00Dlg::OnScrollBtn()
{
osd_set_leds(4);
}

// Num Lock
void CMy011130D00Dlg::OnNumBtn()
{
osd_set_leds(1);
}

// Caps Lock
void CMy011130D00Dlg::OnCapsBtn()
{
osd_set_leds(2);
}

void CMy011130D00Dlg::OnButton1()
{
int new_led = 4;
int old_led = osd_get_leds();

new_led = old_led & (~new_led);

osd_set_leds(new_led);
}

// Scroll,Num and Caps Lock
void CMy011130D00Dlg::OnSetallBtn()
{
osd_set_leds(7);
}

// no Scroll,Num and Caps Lock
void CMy011130D00Dlg::OnSet0Btn()
{
int original_leds;
original_leds = osd_get_leds();

Sleep(100);
osd_set_leds(0);
Sleep(100);

osd_set_leds(original_leds);
}

//============================================================
// osd_get_leds
//============================================================

int osd_get_leds(void)
{
BYTE key_states[256];
int result = 0;

// get the current state
GetKeyboardState(&key_states[0]);

// set the numl0ck bit
result |= (key_states[VK_NUMLOCK] & 1);
result |= (key_states[VK_CAPITAL] & 1) << 1;
result |= (key_states[VK_SCROLL] & 1) << 2;
return result;
}

//============================================================
// osd_set_leds
//============================================================

void osd_set_leds(int state)
{
static OSVERSIONINFO osinfo = { sizeof(OSVERSIONINFO) };
static int version_ready = 0;
BYTE key_states[256];
int oldstate, newstate;

// if we don't yet have a version number, get it
if (!version_ready)
{
version_ready = 1;
GetVersionEx(&osinfo);
}

// thanks to Lee Taylor for the original version of this code

// get the current state
GetKeyboardState(&key_states[0]);

// see if the numlock key matches the state
oldstate = key_states[VK_NUMLOCK] & 1;
TRACE("%d\n",oldstate);
newstate = state & 1;

// if not, simulate a key up/down
if (oldstate != newstate && osinfo.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
{
keybd_event(VK_NUMLOCK, 0x45, KEYEVENTF_EXTENDEDKEY | 0, 0);
keybd_event(VK_NUMLOCK, 0x45, KEYEVENTF_EXTENDEDKEY | KEYEVENTF_KEYUP, 0);
}
key_states[VK_NUMLOCK] = (key_states[VK_NUMLOCK] & ~1) | newstate;

// see if the caps lock key matches the state
oldstate = key_states[VK_CAPITAL] & 1;
newstate = (state >> 1) & 1;

// if not, simulate a key up/down
if (oldstate != newstate && osinfo.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
{
keybd_event(VK_CAPITAL, 0x3a, 0, 0);
keybd_event(VK_CAPITAL, 0x3a, KEYEVENTF_KEYUP, 0);
}
key_states[VK_CAPITAL] = (key_states[VK_CAPITAL] & ~1) | newstate;

// see if the scroll lock key matches the state
oldstate = key_states[VK_SCROLL] & 1;
newstate = (state >> 2) & 1;

// if not, simulate a key up/down
if (oldstate != newstate && osinfo.dwPlatformId != VER_PLATFORM_WIN32_WINDOWS)
{
keybd_event(VK_SCROLL, 0x46, 0, 0);
keybd_event(VK_SCROLL, 0x46, KEYEVENTF_KEYUP, 0);
}
key_states[VK_SCROLL] = (key_states[VK_SCROLL] & ~1) | newstate;

// if we're on Win9x, use SetKeyboardState
if (osinfo.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
SetKeyboardState(&key_states[0]);
}

[yins]

好！！

[yinx]

用sendmessage模拟 caps lock...被按下

[green221]

有 没有代码阿

我是个菜鸟

让我看看

[mostneed]

#include "winable.h"

INPUT input[2];
memset(input, 0, 2*sizeof(INPUT));
input[0].type = input[1].type = INPUT_KEYBOARD;
input[0].ki.wVk = input[1].ki.wVk = VK_CAPITAL;
input[1].ki.dwFlags = KEYEVENTF_KEYUP;
SendInput(2, input, sizeof(INPUT));