File copy by using windows API

#include "Everything.h"        // this is book's own defined header
                            // it includes windows.h etc

#define BUF_SIZE 0x200       

static VOID CatFile (HANDLE, HANDLE);        // method
int _tmain (int argc, LPTSTR argv [])
{
    HANDLE hInFile, hStdIn = GetStdHandle (STD_INPUT_HANDLE);        // make an input handler, see the return type

    HANDLE hStdOut = GetStdHandle (STD_OUTPUT_HANDLE);                // the handle where we want to write
    BOOL dashS;                       
    int iArg, iFirstFile;           

    /*    dashS will be set only if "-s" is on the command line. */
    /*    iFirstFile is the argv [] index of the first input file. */
    iFirstFile = Options (argc, argv, _T("s"), &dashS, NULL);

    if (iFirstFile == argc) { /* No files in arg list. */
        CatFile (hStdIn, hStdOut);
        return 0;
    }
   
    /* Process the input files. */
    for (iArg = iFirstFile; iArg < argc; iArg++) {
        hInFile = CreateFile (argv [iArg], GENERIC_READ,
                0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);        // Create file with
        if (hInFile == INVALID_HANDLE_VALUE) {            // if the file is not appropriate
            if (!dashS) ReportError (_T ("Cat Error: File does not exist."), 0, TRUE);
        } else {
            CatFile (hInFile, hStdOut);
            if (GetLastError() != 0 && !dashS) {
                ReportError (_T ("Cat Error: Could not process file completely."), 0, TRUE);
            }
            CloseHandle (hInFile);
        }
    }
    return 0;
}

static VOID CatFile (HANDLE hInFile, HANDLE hOutFile)
{
    DWORD nIn, nOut;                // Dword mean easily 32bit unsigned int
    BYTE buffer [BUF_SIZE];

    while (ReadFile (hInFile, buffer, BUF_SIZE, &nIn, NULL) && (nIn != 0)
            && WriteFile (hOutFile, buffer, nIn, &nOut, NULL));
    // Read the file and write exactly.
    return;
}

Easy example, take a look at the CatFile, using windows API, ReadFile and WriteFile, makes a copy of the
original file, argv[1]

LPTSTR -> Long Pointer something something, in other words, like char*