Changing the key

This is a discussion on Changing the key within the Windows Programming forums, part of the Platform Specific Boards category; This code should change the key, so when the user enters a, then it shows f. But somehow it doesn't ...

  1. #1
    Reverse Engineer maxorator's Avatar
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    Changing the key

    This code should change the key, so when the user enters a, then it shows f. But somehow it doesn't work.
    Code:
    #define EXPORT_HOOK_FUNCS
    #include"dll.h"
    #pragma data_seg(".hook_data")
    HHOOK HookKeyboard = 0;
    HWND  g_hAppWnd       = 0;
    #pragma data_seg()
    #pragma comment(linker, "/SECTION:.hook_data,RWS")
    
    BOOL WINAPI DllMain(HINSTANCE hinstDLL,DWORD,LPVOID){
    	return TRUE;
    }
    
    HOOK_DECLSPEC BOOL InstallHook(HWND hAppWnd) {
    	if (HookKeyboard != 0){
    		[B]return[/COLOR] FALSE;
    	}
    	g_hAppWnd = hAppWnd;
    	char buffer[256];
    	HookKeyboard = SetWindowsHookEx(WH_KEYBOARD_LL,(HOOKPROC)KeyboardProc, GetModuleHandle(NULL), 0);
    	if (HookKeyboard == 0) {
    		return FALSE;
    	}
    	return TRUE;
    }
    
    HOOK_DECLSPEC void UninstallHook(){
    	UnhookWindowsHookEx(HookKeyboard);
    	g_hAppWnd       = 0;
    	HookKeyboard = 0;
    }
    
    HOOK_DECLSPEC LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam,LPARAM lParam){
    	KBDLLHOOKSTRUCT *p = (KBDLLHOOKSTRUCT *) lParam;
    	if(p->vkCode==0x41){
    		p->vkCode=0x45;
    	}
    	return CallNextHookEx(HookKeyboard, nCode, wParam, lParam);
    }
    Last edited by maxorator; 09-22-2006 at 09:16 AM.
    "The Internet treats censorship as damage and routes around it." - John Gilmore

  2. #2
    Super Moderator VirtualAce's Avatar
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    And why in the world would you want that?

    Hooking the keyboard eh? For what?

  3. #3
    Reverse Engineer maxorator's Avatar
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    I am trying to do a program that would help with other keyboard sets (eg. russian). I don't have a russian keyboard and I get some homeworks in russian, that are good to do with a computer. But... I can't find what does what. A is F on russian keyboard. That's exactly what's showed on the piece of code I posted.
    "The Internet treats censorship as damage and routes around it." - John Gilmore

  4. #4
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    This example may be of some help to you. I was just too lazy to write a DLL.

    Code:
    #include <windows.h>
    #include <stdio.h>
    
    const CHAR RussianAlphabet[] = 
       "zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA";
    const CHAR EnglishAlphabet[] = 
      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    
    LRESULT CALLBACK KeyboardProc(int code, WPARAM wParam,
        LPARAM lParam);
    
    HINSTANCE hInst;
    HHOOK hHook; 
    HWND hwndglobal; 
    
    LRESULT CALLBACK WindowFunc(HWND, UINT, WPARAM, LPARAM);
    char szWindowName[] = "MyWindow";
    
    int WINAPI WinMain(HINSTANCE hThisInst, HINSTANCE hPrevInst, 
                       LPSTR lpszArgs, int nWinMode)
    {
        HWND hwnd;
        MSG msg;
        WNDCLASSEX wcl;
        wcl.cbSize = sizeof(WNDCLASSEX); 
        wcl.hInstance = hThisInst;     
        wcl.lpszClassName = szWindowName; 
        wcl.lpfnWndProc = WindowFunc;  
        wcl.style = 0;
        wcl.hIcon = LoadIcon(NULL, IDI_APPLICATION); 
        wcl.hIconSm = NULL; 
        wcl.hCursor = LoadCursor(NULL, IDC_ARROW);
        wcl.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); 
        wcl.cbClsExtra = 0;
        wcl.cbWndExtra = 0; 
        wcl.lpszMenuName = "KeyboardProc"; 
    
        if(!RegisterClassEx(&wcl)) return 0;
        hwnd = CreateWindow(szWindowName,
            "Demo a keyboard hook, translate from English to Russian",
            WS_OVERLAPPEDWINDOW, 
            CW_USEDEFAULT, CW_USEDEFAULT,
            CW_USEDEFAULT, CW_USEDEFAULT,
            NULL, NULL, hThisInst, NULL);
        hInst = hThisInst; 
        hwndglobal = hwnd;
        ShowWindow(hwnd, nWinMode);
        UpdateWindow(hwnd);
        while(GetMessage(&msg, NULL, 0, 0))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg); 
        }
        return msg.wParam;
    }
    
    LRESULT CALLBACK WindowFunc(HWND hwnd, UINT message,
        WPARAM wParam, LPARAM lParam)
    {
        HDC hdc;
        char str[255];
        TEXTMETRIC tm;
        SIZE size;
        static int X=0, Y=0;   
        static int maxX, maxY; 
        static HDC memdc;    
        static HBITMAP hbit; 
        HBRUSH hbrush;       
    
        switch(message) {
            case WM_CREATE:
                hHook = SetWindowsHookEx(WH_GETMESSAGE, (HOOKPROC) KeyboardProc,
                    NULL, GetCurrentThreadId());
                maxX = GetSystemMetrics(SM_CXSCREEN);
                maxY = GetSystemMetrics(SM_CYSCREEN);
                hdc = GetDC(hwnd);
                memdc = CreateCompatibleDC(hdc);
                hbit = CreateCompatibleBitmap(hdc, maxX, maxY);
                SelectObject(memdc, hbit);
                hbrush = (HBRUSH) GetStockObject(WHITE_BRUSH);
                SelectObject(memdc, hbrush);
                PatBlt(memdc, 0, 0, maxX, maxY, PATCOPY);
                ReleaseDC(hwnd, hdc);
                break;
            case WM_CHAR:
                hdc = GetDC(hwnd);
                GetTextMetrics(hdc, &tm);
                sprintf(str, "%c", (char) wParam); 
                if((char)wParam == '\r') {
                    Y = Y + tm.tmHeight + tm.tmExternalLeading;
                    X = 0; 
                }
                else {
                    TextOut(memdc, X, Y, str, 1); 
                    TextOut(hdc, X, Y, str, 1); 
                    GetTextExtentPoint32(memdc, str, strlen(str), &size);
                    X += size.cx; 
                }
                ReleaseDC(hwnd, hdc);
                break;
            case WM_DESTROY:
                UnhookWindowsHookEx(hHook);
                DeleteDC(memdc);
                DeleteObject(hbit);
                PostQuitMessage(0);
                break;
            default:
                return DefWindowProc(hwnd, message, wParam, lParam);
        }
        return 0;
    }
    
    LRESULT CALLBACK KeyboardProc(int code, WPARAM wParam, LPARAM lParam)
    {
        MSG *msg;
        msg = (MSG *) lParam;
        if(code >= 0) 
            switch(msg->message) {
                case WM_CHAR:
                    LPTSTR lptstrChar =  strchr(RussianAlphabet,  msg->wParam);
                    if( lptstrChar )
                    {
                        size_t offset = lptstrChar - RussianAlphabet;
                        msg->wParam = (WPARAM) EnglishAlphabet[offset];
                    }
            }
        return CallNextHookEx(hHook, code, wParam, lParam);
    }

  5. #5
    Reverse Engineer maxorator's Avatar
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    I just changed my DLL into this by your example, but still doesn't work:
    Code:
    #define EXPORT_HOOK_FUNCS
    #include "dll.h"
    #pragma data_seg(".hook_data")
    HHOOK HookKeyboard = 0;
    HWND  g_hAppWnd       = 0;
    #pragma data_seg()
    #pragma comment(linker, "/SECTION:.hook_data,RWS")
    const CHAR RussianAlphabet[] = 
       "zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA";
    const CHAR EnglishAlphabet[] = 
      "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    BOOL WINAPI DllMain(HINSTANCE hinstDLL,DWORD,LPVOID){
    	return TRUE;
    }
    
    HOOK_DECLSPEC BOOL InstallHook(HWND hAppWnd) {
    	if (HookKeyboard != 0){
    		return FALSE;
    	}
    	g_hAppWnd = hAppWnd;
    	char buffer[256];
    	HookKeyboard = SetWindowsHookEx(WH_GETMESSAGE,(HOOKPROC)KeyboardProc, GetModuleHandle(NULL), 0);
    	if (HookKeyboard == 0) {
    		return FALSE;
    	}
    	return TRUE;
    }
    
    HOOK_DECLSPEC void UninstallHook(){
    	UnhookWindowsHookEx(HookKeyboard);
    	g_hAppWnd       = 0;
    	HookKeyboard = 0;
    }
    
    HOOK_DECLSPEC LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam,LPARAM lParam){
        MSG *msg;
        msg = (MSG *) lParam;
        if(nCode >= 0) 
            switch(msg->message) {
                case WM_CHAR:
                    LPTSTR lptstrChar =  strchr(RussianAlphabet,  msg->wParam);
                    if( lptstrChar )
                    {
                        size_t offset = lptstrChar - RussianAlphabet;
                        msg->wParam = (WPARAM) EnglishAlphabet[offset];
                    }
            }
        MessageBox(g_hAppWnd,"aa","aa",MB_OK);
        return CallNextHookEx(HookKeyboard, nCode, wParam, lParam);
    }
    "The Internet treats censorship as damage and routes around it." - John Gilmore

  6. #6
    Reverse Engineer maxorator's Avatar
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    The only way it would work is this, but I don't want to use this method:
    Code:
    #define EXPORT_HOOK_FUNCS
    #include "dll.h"
    #pragma data_seg(".hook_data")
    HHOOK HookKeyboard = 0;
    HWND  hwnd       = 0;
    #pragma data_seg()
    #pragma comment(linker, "/SECTION:.hook_data,RWS")
    
    BOOL WINAPI DllMain(HINSTANCE hinstDLL,DWORD,LPVOID){
    	return TRUE;
    }
    
    HOOK_DECLSPEC BOOL InstallHook(HWND hAppWnd) {
    	if (HookKeyboard != 0){
    		return FALSE;
    	}
    	hwnd = hAppWnd;
    	char buffer[256];
    	HookKeyboard = SetWindowsHookEx(WH_KEYBOARD_LL,(HOOKPROC)KeyboardProc, GetModuleHandle(NULL), 0);
    	if (HookKeyboard == 0) {
    		return FALSE;
    	}
    	return TRUE;
    }
    
    HOOK_DECLSPEC void UninstallHook(){
    	UnhookWindowsHookEx(HookKeyboard);
    	hwnd       = 0;
    	HookKeyboard = 0;
    }
    
    HOOK_DECLSPEC LRESULT CALLBACK KeyboardProc(int nCode, WPARAM wParam,LPARAM lParam){
    	char buffer[256];
    	if(nCode==HC_ACTION){
    		if(((KBDLLHOOKSTRUCT*)lParam)->vkCode==0x41){
    			INPUT ms;
    			ms.type=INPUT_KEYBOARD;
    			ms.ki.wVk=0x46;
    			if(wParam==WM_KEYDOWN){
    				ms.ki.dwFlags=0;
    			}
    			else{
    				ms.ki.dwFlags=KEYEVENTF_KEYUP;
    			}
    			SendInput(1,&ms,sizeof(INPUT));
    			return -1;
    		}
    	}
        return CallNextHookEx(HookKeyboard, nCode, wParam, lParam);
    }
    "The Internet treats censorship as damage and routes around it." - John Gilmore

  7. #7
    Cat
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    Quote Originally Posted by maxorator
    I am trying to do a program that would help with other keyboard sets (eg. russian). I don't have a russian keyboard and I get some homeworks in russian, that are good to do with a computer. But... I can't find what does what. A is F on russian keyboard. That's exactly what's showed on the piece of code I posted.
    Why not just go into Regional and Language options and add Russian as an input language? Then you should, with a click of the mouse or hotkey, be able to use your keyboard as if it was a Russian keyboard. You might want to get out a fine-tipped marker and write the Cyrillic characters on your keys, though, until you get used to the new layout and never need to look.
    You ever try a pink golf ball, Wally? Why, the wind shear on a pink ball alone can take the head clean off a 90 pound midget at 300 yards.

  8. #8
    Reverse Engineer maxorator's Avatar
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    I am not going to write in russian very much. I need to do some homeworks with it (maybe once in two weeks). And I also don't want to ruin my keyboard. I want to do so, that russian A would come, when I press my A. That means, I still have to use Regional and Language options.
    "The Internet treats censorship as damage and routes around it." - John Gilmore

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