Hi guys.
I want to write a keylogger which logs all strings I copy via <CTRL>+<C>
My problem is that I loose track of interessting links or code-snippets when overdoing it.
So I want a basic keylogger which notices every hotkey event and copies the content in the clipboard into a file.
The problem is that the clipboard doens't copy a string as I block the hotkey with my keyhook.
That means that the last copied string stays in the clipboard and as long as my programm runs I can't save new content with the hot key, as the event will not be passed to windows.
I have to pass the event to windows but I don't know how.
Here's the code, thanks for advice.
#include <windows.h>
#include <fstream>
#include <iostream>
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
#define MY_HOTKEYID 100
/* Make the class name into a global variable */
char szClassName[ ] = "kl";
char* GetClipBoard(void)
{
HANDLE clip;
if (OpenClipboard(NULL))
clip = GetClipboardData(CF_TEXT);
return (char*)clip;
}
HANDLE SetClipboard(std::string cpy)
{
const char* output = cpy.c_str();
const size_t len = strlen(output) + 1;
HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, len);
memcpy(GlobalLock(hMem), output, len);
GlobalUnlock(hMem);
OpenClipboard(0);
EmptyClipboard();
SetClipboardData(CF_TEXT, hMem);
CloseClipboard();
return 0;
}
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"kl", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
// ShowWindow (hwnd, nCmdShow);
RegisterHotKey(hwnd,MY_HOTKEYID,MOD_CONTROL,0x44);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
UnregisterHotKey(hwnd,MY_HOTKEYID);
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
case WM_HOTKEY :
{
// Nope. Windows doesn't recieved any <Ctrl><c> hotkey, hence there is no new stuff in the clipboard
// How to pass the event to windows then, before checking the clipboard again ?
std::string help = GetClipBoard();
std::cout << "Clip : " << help;
if (help.size() < 100)
{
std::ofstream tempfile("Records.txt", std::ios::app);
SYSTEMTIME time;
GetLocalTime(&time);
tempfile << "<" << help << ">";
tempfile << "Logging at " << time.wHour << ":" << time.wMinute << ":" << time.wSecond << " on " << time.wDay << "." << time.wMonth << "." << time.wYear << " (DD.MM.YYYY)\n\n";
tempfile.close();
}
}
default: /* for messages that we don't deal with */
return DefWindowProc (0, message, wParam, lParam);
}
return 0;
}
