VC：读写文件 及 注册表

void CFileView::OnFileWrite()
{
 // TODO: Add your command handler code here
 CFileDialog fileDlg(FALSE);
 fileDlg.m_ofn.lpstrTitle="我的文件保存对话框";
 fileDlg.m_ofn.lpstrFilter="Text Files(*.txt)\0*.txt\0All Files(*.*)\0*.*\0\0";
 fileDlg.m_ofn.lpstrDefExt="txt";
 if(IDOK==fileDlg.DoModal())
 {
  CFile file(fileDlg.GetFileName(),CFile::modeCreate | CFile::modeWrite);
  file.Write("http://www.gaoyuan.org",strlen("http://www.gaoyuan.org"));
  file.Close();
 }
}

void CFileView::OnFileRead()
{
 // TODO: Add your command handler code here
 CFileDialog fileDlg(TRUE);
 fileDlg.m_ofn.lpstrTitle="我的文件打开对话框";
 fileDlg.m_ofn.lpstrFilter="Text Files(*.txt)\0*.txt\0All Files(*.*)\0*.*\0\0";
 
 if(IDOK==fileDlg.DoModal())
 {
  CFile file(fileDlg.GetFileName(),CFile::modeRead);
  char *pBuf;
  DWORD dwFileLen;
  dwFileLen=file.GetLength();
  pBuf=new char[dwFileLen+1];
  pBuf[dwFileLen]=0;
  file.Read(pBuf,dwFileLen);
  file.Close();
  MessageBox(pBuf);
 }
}

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串行化读写

void CGraphicView::OnFileWrite()
{
 // TODO: Add your command handler code here
 CFile file("1.txt",CFile::modeCreate | CFile::modeWrite);
 CArchive ar(&file,CArchive::store);
 int i=4;
 char ch='a';
 float f=1.3f;
 CString str("http://www.sunxin.org");
 ar<<i<<ch<<f<<str;
}

void CGraphicView::OnFileRead()
{
 // TODO: Add your command handler code here
 CFile file("1.txt",CFile::modeRead);
 CArchive ar(&file,CArchive::load);
 int i;
 char ch;
 float f;
 CString str;
 CString strResult;
 ar>>i>>ch>>f>>str;
 strResult.Format("%d,%c,%f,%s",i,ch,f,str);
 MessageBox(strResult);
}

==============================================================

void CFileView::OnRegWrite()
{
 // TODO: Add your command handler code here
 HKEY hKey;
 DWORD dwAge=30;
 RegCreateKey(HKEY_LOCAL_MACHINE,"Software\\http://www.gaoyuan.org\\admin",&hKey);
 RegSetValue(hKey,NULL,REG_SZ,"zhangsan",strlen("zhangsan"));
 RegSetValueEx(hKey,"age",0,REG_DWORD,(CONST BYTE*)&dwAge,4);
 RegCloseKey(hKey);
}

void CFileView::OnRegRead()
{
 // TODO: Add your command handler code here
 HKEY hKey;
 RegOpenKey(HKEY_LOCAL_MACHINE,"Software\\http://www.gaoyuan.org\\admin",&hKey);
 DWORD dwType;
 DWORD dwValue;
 DWORD dwAge;
 RegQueryValueEx(hKey,"age",0,&dwType,(LPBYTE)&dwAge,&dwValue);
 CString str;
 str.Format("age=%d",dwAge);
 MessageBox(str);
}