I am working on an application specific keystroke dynamics tool. My requirement is to get keystroke timing data of a user in the Windows CMD prompt . After a few searches, I have found 2 ways of doing doing this: 1) Use windows hooks 2) Pyhook - a python wrapper module
It appears to me that my applications functionality will be quite similar to that of a key-logger. But I am unable to figure out if I should use global hooks or thread specific hook for intercepting keystrokes to the CMD prompt. And If using a global hook, is it possible to filter keystrokes based on the target application?
This good code below is a Hotkey app that sits in the background listening for the CTRL-y
key combination, and you can modify or add any more key combinations to the app. Use CTRL-q
to exit the app when hidden.
If you wish to fully hide the console window, then un-comment this line in main() : //ShowWindow(FindWindowA("ConsoleWindowClass", NULL), false)
. Enjoy.
if (CTRL_key !=0 && key == 'y' )
{
MessageBox(NULL, "CTRL-y was pressed\nLaunch your app here", "H O T K E Y", MB_OK);
CTRL_key=0;
}
Full code listing:
#define _WIN32_WINNT 0x0400
#pragma comment( lib, "user32.lib" )
#include <windows.h>
#include <stdio.h>
HHOOK hKeyboardHook;
__declspec(dllexport) LRESULT CALLBACK KeyboardEvent (int nCode, WPARAM wParam, LPARAM lParam)
{
DWORD SHIFT_key=0;
DWORD CTRL_key=0;
DWORD ALT_key=0;
if ((nCode == HC_ACTION) && ((wParam == WM_SYSKEYDOWN) || (wParam == WM_KEYDOWN)))
{
KBDLLHOOKSTRUCT hooked_key = *((KBDLLHOOKSTRUCT*)lParam);
DWORD dwMsg = 1;
dwMsg += hooked_key.scanCode << 16;
dwMsg += hooked_key.flags << 24;
char lpszKeyName[1024] = {0};
lpszKeyName[0] = '[';
int i = GetKeyNameText(dwMsg, (lpszKeyName+1),0xFF) + 1;
lpszKeyName[i] = ']';
int key = hooked_key.vkCode;
SHIFT_key = GetAsyncKeyState(VK_SHIFT);
CTRL_key = GetAsyncKeyState(VK_CONTROL);
ALT_key = GetAsyncKeyState(VK_MENU);
if (key >= 'A' && key <= 'Z')
{
if (GetAsyncKeyState(VK_SHIFT)>= 0) key +=32;
if (CTRL_key !=0 && key == 'y' )
{
MessageBox(NULL, "CTRL-y was pressed\nLaunch your app here", "H O T K E Y", MB_OK);
CTRL_key=0;
}
if (CTRL_key !=0 && key == 'q' )
{
MessageBox(NULL, "Shutting down", "H O T K E Y", MB_OK);
PostQuitMessage(0);
}
printf("key = %c\n", key);
SHIFT_key = 0;
CTRL_key = 0;
ALT_key = 0;
}
printf("lpszKeyName = %s\n", lpszKeyName );
}
return CallNextHookEx(hKeyboardHook, nCode,wParam,lParam);
}
void MessageLoop()
{
MSG message;
while (GetMessage(&message,NULL,0,0))
{
TranslateMessage( &message );
DispatchMessage( &message );
}
}
DWORD WINAPI my_HotKey(LPVOID lpParm)
{
HINSTANCE hInstance = GetModuleHandle(NULL);
if (!hInstance) hInstance = LoadLibrary((LPCSTR) lpParm);
if (!hInstance) return 1;
hKeyboardHook = SetWindowsHookEx ( WH_KEYBOARD_LL, (HOOKPROC) KeyboardEvent, hInstance, NULL );
MessageLoop();
UnhookWindowsHookEx(hKeyboardHook);
return 0;
}
int main(int argc, char** argv)
{
HANDLE hThread;
DWORD dwThread;
hThread = CreateThread(NULL,NULL,(LPTHREAD_START_ROUTINE) my_HotKey, (LPVOID) argv[0], NULL, &dwThread);
//ShowWindow(FindWindowA("ConsoleWindowClass", NULL), false);
if (hThread) return WaitForSingleObject(hThread,INFINITE);
else return 1;
}
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