File.cpp

[詳解]

// ----------------------------------------------------------------------------
 
#include "pch.h"
#include "File.h"
 
using namespace alt;
 
BOOL File::Create (
    LPCTSTR lpctszFileName, DWORD dwDesiredAccess, DWORD dwShareMode,
    DWORD dwCreationDisposition)
{
    BOOL ret = TRUE;
    PSECURITY_ATTRIBUTES pSecurityAttributes = NULL;
    DWORD dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
    HANDLE hTemplateFile = NULL;
 
    _hObject = ::CreateFile (
        lpctszFileName,
        dwDesiredAccess,
        dwShareMode,
        pSecurityAttributes,
        dwCreationDisposition,
        dwFlagsAndAttributes,
        hTemplateFile);
    if (_hObject == INVALID_HANDLE_VALUE)
    {
        ret = FALSE;
    }
 
    return ret;
}
 
BOOL File::SetPointer (DWORD dwMoveMethod, LARGE_INTEGER liDistanceToMove) const
{
    return ::SetFilePointerEx (
        _hObject,
        liDistanceToMove,
        NULL,
        dwMoveMethod);
}
 
BOOL File::SetEOF () const
{
    return ::SetEndOfFile (_hObject);
}
 
LONGLONG File::GetSize () const
{
    LARGE_INTEGER liFileSize;
    LONGLONG response;
 
    BOOL ret = ::GetFileSizeEx (_hObject, &liFileSize);
    if (ret == TRUE)
    {
        response = liFileSize.QuadPart;
    }
    else
    {
        response = (LONGLONG)-1;
    }
 
    return response;
}
 
DWORD File::GetType () const
{
    return ::GetFileType (_hObject);
}
 
BOOL File::IsOpen () const
{
    return _hObject == INVALID_HANDLE_VALUE ? FALSE : TRUE;
}