CFile.cpp

[Upsha (思而不學則殆)]

//--- CFile Implementation ---

CFile::CFile(char* lpszFileName, UINT nOpenFlags)
{
  Open(lpszFileName, nOpenFlags);
}

UINT CFile::Read(void* lpBuf, UINT nCount)
{
  if (nCount == 0)
      return 0;   // avoid Win32 "null-read"

  assert(lpBuf != NULL);

  if (nCount != ::fread(lpBuf, 1, nCount, m_hFile))
      assert(FALSE);  // fread() fail

  return (UINT)nCount;
}

void CFile::Write(const void* lpBuf, UINT nCount)
{
  if (nCount == 0)
      return;     // avoid Win32 "null-write" option

  assert(lpBuf != NULL);

  DWORD nWritten = ::fwrite(lpBuf, 1, nCount, m_hFile);
  assert(nWritten == nCount);
}

CFile::~CFile()
{
  Close();
}

void CFile::Close()
{
  ::fclose(m_hFile);
  m_hFile = NULL;
}


BOOL CFile::Open(char* lpszFileName, UINT nOpenFlags)
{
  // attempt file creation
  switch (nOpenFlags)
  {
  case modeRead:
          m_hFile = ::fopen(lpszFileName, "rt");
          break;
  case modeWrite:
          m_hFile = ::fopen(lpszFileName, "wt");
          break;
  default:
          assert(FALSE);  // invalid share mode
  }

  assert(m_hFile != NULL);
  return TRUE;
}

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