#include "../kbswitch.h"

Include dependency graph for kbsdll.c:

Functions
static VOID	PostMessageToMainWnd (UINT Msg, WPARAM wParam, LPARAM lParam)

static LRESULT CALLBACK	WinHookProc (INT code, WPARAM wParam, LPARAM lParam)

static LRESULT CALLBACK	ShellHookProc (INT code, WPARAM wParam, LPARAM lParam)

static LRESULT CALLBACK	KeyboardLLHook (INT code, WPARAM wParam, LPARAM lParam)

BOOL APIENTRY	KbSwitchSetHooks (_In_ BOOL bDoHook)

BOOL WINAPI	DllMain (IN HINSTANCE hinstDLL, IN DWORD dwReason, IN LPVOID lpvReserved)

Variables
HHOOK	hWinHook = NULL

HHOOK	hShellHook = NULL

HHOOK	hKeyboardLLHook = NULL

HINSTANCE	hInstance = NULL

HWND	hKbSwitchWnd = NULL

Function Documentation

◆ DllMain()

BOOL WINAPI DllMain	(	IN HINSTANCE	hinstDLL,
		IN DWORD	dwReason,
		IN LPVOID	lpvReserved
	)

Definition at line 129 of file kbsdll.c.

{
    switch (dwReason)
    {
        case DLL_PROCESS_ATTACH:
        {
            hInstance = hinstDLL;
            hKbSwitchWnd = FindWindow(szKbSwitcherName, NULL);
            if (!hKbSwitchWnd)
                return FALSE;
        }
        break;
    }
 
    return TRUE;
}

◆ KbSwitchSetHooks()

BOOL APIENTRY KbSwitchSetHooks ( _In_ BOOL bDoHook )

Definition at line 97 of file kbsdll.c.

{
    if (bDoHook)
    {
        hWinHook = SetWindowsHookEx(WH_CBT, WinHookProc, hInstance, 0);
        hShellHook = SetWindowsHookEx(WH_SHELL, ShellHookProc, hInstance, 0);
        hKeyboardLLHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardLLHook, hInstance, 0);
 
        if (hWinHook && hShellHook && hKeyboardLLHook)
            return TRUE;
    }
 
    /* Unhook */
    if (hKeyboardLLHook)
    {
        UnhookWindowsHookEx(hKeyboardLLHook);
        hKeyboardLLHook = NULL;
    }
    if (hShellHook)
    {
        UnhookWindowsHookEx(hShellHook);
        hShellHook = NULL;
    }
    if (hWinHook)
    {
        UnhookWindowsHookEx(hWinHook);
        hWinHook = NULL;
    }
    return !bDoHook;
}

◆ KeyboardLLHook()

static LRESULT CALLBACK KeyboardLLHook	(	INT	code,
		WPARAM	wParam,
		LPARAM	lParam
	)

static

Definition at line 69 of file kbsdll.c.

{
    if (code < 0)
        return CallNextHookEx(hKeyboardLLHook, code, wParam, lParam);
 
    if (code == HC_ACTION)
    {
        KBDLLHOOKSTRUCT *pKbStruct = (KBDLLHOOKSTRUCT *)lParam;
        if (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN)
        {
            BOOL bShiftPressed = GetAsyncKeyState(VK_SHIFT) < 0;
            BOOL bAltPressed = GetAsyncKeyState(VK_MENU) < 0;
            BOOL bCtrlPressed = GetAsyncKeyState(VK_CONTROL) < 0;
            // Detect Alt+Shift and Ctrl+Shift
            if ((pKbStruct->vkCode == VK_SHIFT && bAltPressed) ||
                (pKbStruct->vkCode == VK_MENU && bShiftPressed) ||
                (pKbStruct->vkCode == VK_SHIFT && bCtrlPressed) ||
                (pKbStruct->vkCode == VK_CONTROL && bShiftPressed))
            {
                PostMessageToMainWnd(WM_LANG_CHANGED, 0, 0);
            }
        }
    }
 
    return CallNextHookEx(hKeyboardLLHook, code, wParam, lParam);
}

Referenced by KbSwitchSetHooks().

◆ PostMessageToMainWnd()

static VOID PostMessageToMainWnd	(	UINT	Msg,
		WPARAM	wParam,
		LPARAM	lParam
	)

static

Definition at line 19 of file kbsdll.c.

{
    PostMessage(hKbSwitchWnd, Msg, wParam, lParam);
}

Referenced by KeyboardLLHook(), ShellHookProc(), and WinHookProc().

◆ ShellHookProc()

static LRESULT CALLBACK ShellHookProc	(	INT	code,
		WPARAM	wParam,
		LPARAM	lParam
	)

static

Definition at line 46 of file kbsdll.c.

{
    if (code < 0)
        return CallNextHookEx(hShellHook, code, wParam, lParam);
 
    switch (code)
    {
        case HSHELL_WINDOWACTIVATED:
        {
            PostMessageToMainWnd(WM_WINDOW_ACTIVATE, wParam, 0);
            break;
        }
        case HSHELL_LANGUAGE:
        {
            PostMessageToMainWnd(WM_LANG_CHANGED, wParam, lParam);
            break;
        }
    }
 
    return CallNextHookEx(hShellHook, code, wParam, lParam);
}

Referenced by KbSwitchSetHooks().

◆ WinHookProc()

static LRESULT CALLBACK WinHookProc	(	INT	code,
		WPARAM	wParam,
		LPARAM	lParam
	)

static

Definition at line 25 of file kbsdll.c.

{
    if (code < 0)
        return CallNextHookEx(hWinHook, code, wParam, lParam);
 
    switch (code)
    {
        case HCBT_ACTIVATE:
        case HCBT_SETFOCUS:
        {
            HWND hwndFocus = (HWND)wParam;
            if (hwndFocus && hwndFocus != hKbSwitchWnd)
                PostMessageToMainWnd(WM_WINDOW_ACTIVATE, (WPARAM)hwndFocus, 0);
            break;
        }
    }
 
    return CallNextHookEx(hWinHook, code, wParam, lParam);
}