How can you change the Caplock state

[DaoK]

How can you change the caplock and numlock state ?

I tryed something like that :

asm{
mov ax, 0x0040
mov es, ax
mov ah, es:[0x0017]
xor ah, 0x40
mov es:[0x0017], ah
}

But it doesnt work ??? Why ?

[chilibean]

Simple. Use GetKeyboardState and SetKeyboardState from the Win32 API to manipulate these two keys. Pass an array with your character states to these two functions.

[DaoK]

I never used api in C++... maybe you can give me a code that will introduce me on it please.


I will really appreaciate

Daok

[chilibean]

Sorry, but I seem to be having some trouble with creating code that actually works correctly. I have code that works correctly in VB but not in VC++. Here's the VB code that works:

Private Declare Function GetKeyboardState Lib "user32" (pbKeyState As Byte) As Long

Private Declare Function SetKeyboardState Lib "user32" (lppbKeyState As Byte) As Long

Private Sub SetKeyState(intKey As Integer, fTurnOn As Boolean)

    ' Retrieve the keyboard state, set the particular
    ' key in which you're interested, and then set
    ' the entire keyboard state back the way it
    ' was, with the one key altered.
    Dim abytBuffer(0 To 255) As Byte
    GetKeyboardState abytBuffer(0)
    abytBuffer(intKey) = CByte(Abs(fTurnOn))
    SetKeyboardState abytBuffer(0)
End Sub 

And here's the C++ versions (2):

#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 SetCapsLock( BOOL bState )
{
      BYTE keyState[256];

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

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

void main()
{

    unsigned char KeyBoardArray[256];
    GetKeyboardState(KeyBoardArray);
    
    KeyBoardArray[20/*Caps Lock*/] = (char)1; // Or 0 for off
    KeyBoardArray[144/*Num Lock*/] = (char)1; // Or 0 for off
    KeyBoardArray[145/*Scroll Lock*/] = (char)1; // Or 0 for off

    SetKeyboardState(KeyBoardArray);

    SetNumLock( true );
    SetCapsLock( true );
} 

You can try out the code if you like. Anyone else have any ideas?

[parksie]

GetKeyboardState((LPBYTE)&keyState);

This bit should just be GetKeyboardState(keyState) since it's already a pointer (not indexing into the array returns a pointer to the first element).

And the same for the other function