文件分割源代码，可以对任意大小的文件进行分割

以下是几个主要的函数，具体的实现请参考源代码： 　 long CFileSpltDlg::GetSplitFileSize() //获取用户选择文件分割后的大小 { char buf[100]; m_FileSize.GetWindowText(buf,100); for(int i=0; i<(int)strlen(buf); i++) { if(!::isdigit(buf[i])) { MessageBox("请输入数字!","文件分割",MB_ICONEXCLAMATION); return 0; } } return atoi(buf)*1000000; } 　 　 int CFileSpltDlg::MergeMe() // 文件合并涵数 { CWaitCursor wait; CFile destFile; CFileException ex; BYTE buffer[140000]; DWORD dwRead; UINT nCount = 140000; UINT newlen = 1400000; char buff[20]; long l = 1; CString name; CString pref; CString newpath; UpdateData(TRUE); if (!m_path.IsEmpty()) { if (!m_SourceFile.Open(m_path, CFile::modeRead | CFile::shareDenyNone | CFile::typeBinary, &ex)) { TCHAR szError[1024]; ex.GetErrorMessage(szError, 1024); ::AfxMessageBox(szError); m_edit.SetFocus(); m_edit.SetSel(0, - 1); return 1; } m_filename = m_path.Right((m_path.GetLength() - m_path.ReverseFind('\\')) - 1); m_SourceFile.Close(); } newpath = m_path.Left(m_path.GetLength() - m_filename.GetLength()); if (!m_targetpath.IsEmpty()) { if (!m_filename.IsEmpty() && m_filename.Left(2) != _T("1_")) { ::AfxMessageBox(_T("待合并的源文件名不对..."), MB_ICONERROR); return 1; } else if (m_filename.IsEmpty()) { MessageBox(_T("请选择待合并的源文件."), _T("文件分割器"), MB_ICONEXCLAMATION); return 1; } m_filename = m_filename.Right(m_filename.GetLength() - 2); if (m_targetpath.Right(1) == '\\') m_path = m_targetpath + m_filename; else m_path = m_targetpath + _T("\\") + m_filename; if (!destFile.Open(m_path, CFile::modeWrite | CFile::shareExclusive | CFile ::typeBinary | CFile::modeCreate, &ex)) { TCHAR szError[1024]; ex.GetErrorMessage(szError, 1024); ::AfxMessageBox(szError); return 0; } } else if (m_path.IsEmpty()) { MessageBox(_T("请选择待合并的源文件."), _T("文件分割器"), MB_ICONEXCLAMATION); return 1; } if (m_targetpath.IsEmpty()) { //target is not there MessageBox(_T("请选择合并后要保存到的目标文件夹."), _T("文件分割器"), MB_ICONEXCLAMATION); return 1; } do { pref = _ltoa(l, buff, 10); pref += _T("_"); if (!m_SourceFile.Open(newpath + pref + m_filename, CFile::modeRead | CFile ::shareExclusive | CFile::typeBinary, &ex)) { TCHAR szError[1024]; ex.GetErrorMessage(szError, 1024); destFile.Close(); m_path = _T(""); m_filename = _T(""); newpath = _T(""); UpdateData(FALSE); return 0; } else name = _T(newpath + pref + m_filename); do { dwRead = m_SourceFile.Read(buffer, nCount); destFile.Write(buffer, dwRead); } while (dwRead > 0); m_SourceFile.Close() ; pProgress.SetRange(0, 500); for (int i = 0; i < 500; i++) pProgress.SetPos(i); m_parts = _ltoa(l, buff, 10); m_parts += _T("个文件已合并"); UpdateData(FALSE); l++; UpdateWindow(); } while (l < 500) ; return 0; } 　 int CFileSpltDlg::SplitMe() //文件分割涵数 { CWaitCursor wait; CFile destFile; CFileException ex; DWORD dwRead; UINT newlen; char buff [20]; char b [20]; long l = 1; CString name; UINT len = 0; UpdateData(TRUE); newlen=GetSplitFileSize(); //获取文件分割后的大小，定义相对应变量数值 UINT nCount = newlen/10; BYTE buffer[140000]; if (!m_path.IsEmpty()) { if (!m_SourceFile.Open(m_path, CFile::modeRead | CFile::shareDenyNone | CFile::typeBinary, &ex)) { TCHAR szError[1024]; ex.GetErrorMessage(szError, 1024); ::AfxMessageBox(szError); m_edit.SetFocus(); m_edit.SetSel(0, -1); return 1; } len = m_SourceFile.GetLength(); } else { MessageBox(_T("请选择待分割的源文件."), _T("文件分割器"), MB_ICONEXCLAMATION); return 1; } if (m_targetpath.IsEmpty()) { MessageBox(_T("请选择分割后保存到的目标文件夹."), _T("文件分割器"), MB_ICONEXCLAMATION); return 1; } if (len < newlen) { CString length = _itoa(len, b, 10); MessageBox(_T("文件长度为 " + length + " 字节，不够指定的分割大小， 没有必要再进行分割."), _T("文件分割器"), MB_ICONEXCLAMATION); m_SourceFile.Close(); m_path = _T(""); m_filename = _T(""); UpdateData(FALSE); return 1; } do { name = _ltoa(l, buff, 10); name += _T("_"); CString newpath; //判断选择目录未尾是否已有"\"符 if(m_targetpath.Right(1)=='\\') newpath = m_targetpath; else newpath = m_targetpath + _T("\\"); if (!destFile.Open(newpath + name + m_SourceFile.GetFileName(), CFile::modeWrite | CFile::shareExclusive | CFile::typeBinary | CFile::modeCreate, &ex)) { TCHAR szError[1024]; ex.GetErrorMessage(szError, 1024); ::AfxMessageBox(szError); m_SourceFile.Close(); return 1; } do { dwRead = m_SourceFile.Read(buffer, nCount); destFile.Write(buffer, dwRead); }while (dwRead > 0 && destFile.GetLength() < newlen); destFile.Close(); pProgress.SetRange(0, len /newlen*10); pProgress.SetPos(l); m_parts = _ltoa(l , buff, 10); m_parts += _T("个文件生成"); UpdateData(FALSE); l++; UpdateWindow(); }while (dwRead > 0); m_SourceFile.Close(); m_path = _T(""); m_filename = _T(""); UpdateData(FALSE); return 0; } 　 　目录浏览： 　 void CFileSpltDlg::OnBrowse() { static char BASED_CODE szSplitFilter[] = _T("待分割文件(*.*)|*.*||"); static char BASED_CODE szMergeFilter[] = _T("待合并文件(1_*.*)|1_*.*||"); CString filter; if (!m_split) filter = szMergeFilter; else filter = szSplitFilter; CFileDialog dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_FILEMUSTEXIST, filter, 0); if (dlg.DoModal() == IDOK) { m_path = dlg.GetPathName(); m_filename = dlg.GetFileName(); UpdateData(FALSE); } }