int main(int argc, LPTSTR argv[])
{
using std::cin;
using std::cout;

HANDLE hIn, hOut;
DWORD nIn, nOut;
CHAR Buffer[BUF_SIZE];

if (argc != 3) {
cout << "Using: cpW file1 file2n";
return 1;
}

hIn = CreateFile(argv[1], GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hIn == INVALID_HANDLE_VALUE) {
    cout << "Can't open source file. Error: ";
    cout << GetLastError();

    return 2;
}
hOut = CreateFile(argv[2], GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hOut == INVALID_HANDLE_VALUE) {
    cout << "Can't open destination file. Error: ";
    cout << GetLastError();

    return 3;
}
else cout << "nDONE!";

while (ReadFile(hIn, Buffer, BUF_SIZE, &nIn, NULL)) {
    WriteFile(hOut, Buffer, nIn, &nOut, NULL);
    if (nIn != nOut) {
        cout << "Error" << GetLastError();
        return 4;
    }
}

CloseHandle(hIn);
CloseHandle(hOut);

}