windows code

#include <Windows.h>
#include <stdio.h>
#define BUF_SIZE 256

int main(int argc, LPTSTR argv[])
{
HANDLE hIn, hOut;
DWORD dIn, dOut;
CHAR Buffer[BUF_SIZE];

if (argc != 3)
{
printf("Usage: cpW file1 file2\n");
return 1;
}

hIn = CreateFile(argv[1], GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hIn == INVALID_HANDLE_VALUE)
{
printf("Cannot open input file. Error:%x\n", GetLastError());
return 2;
}

hOut = CreateFile(argv[2], GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

if (hOut == INVALID_HANDLE_VALUE)
{
printf("Cannot open output file. Error:%x\n", GetLastError());
return 3;
}

while(ReadFile(hIn, Buffer, BUF_SIZE, &hIn, NULL) && hIn > 0)
{
WriteFile(hOut, Buffer, hIn, &hOut, NULL);
if (hIn != hOut)
{
printf("Fatal write error: %x\n", GetLastError() );
return 4;
}
}
CloseHandle(hIn);
CloseHandle(hOut);
return 0;
}