xbgs

下面是我在編程中運用CTypedPtrMap指針模板類的方法，其存儲結構占用物理空間小，比單純的用數組結構存儲的文件將小很多，所以是一種非常推薦的存儲及讀取文件的方法。

你必須在stdafx.h文件中 包含? #include <afxtempl.h>??? // MFC templates
在頭文件中包含? #include <io.h>

其中 CBank.h文件如下：

class CBank : public CObject? 
{
DECLARE_SERIAL(CBank)?? //聲明序列化存儲
public:
??? ?? CBank();
?????? CBank(CString str){ m_bankname = str; }
?????? CBank(const CBank &b){ m_bankname= b.m_bankname;} //拷貝構造函數
????? ? virtual ~CBank();
private:
?????? CString? m_bankname;
public:
??? virtual void Serialize(CArchive& ar);
};
typedef CTypedPtrMap<CMapStringToOb, 
???????????????????? CString,
???????????????????? CBank*>CBanktmp;? //這個才是我們根據此類生成的類型

它的實現文件.cpp如下：

IMPLEMENT_SERIAL(CBank, CObject, 1)?? //實現序列化存儲
CBank::CBank()
{
?  ? m_bankname="";
}
CBank::~CBank()
{
}
void CBank::Serialize(CArchive& ar)
{
??? if (ar.IsLoading())
??? {
??????? ar >> m_bankname;
??? }
??? else
??? {
??????? ar << m_bankname;
??? }
}

/*----------------------------------------------------
從文件中讀取參數：
注意： 其中的m_map是這樣定義的：CBanktmp? m_map;
-------------------------------------------------*/

void CDlgBankIn::LoadBankName()
{
?????? UINT? nFlags = CFile::typeBinary |CFile::modeReadWrite;
?????? if(_access(_T("BankName.dat"),0))
?????? {
????????????? nFlags |= CFile::modeCreate;
?????? }
?????? CFile file;
?????? CFileException fe;
?????? if (file.Open(_T("BankName.dat"),nFlags, &fe))
?????? {
?????????? if(file.GetLength()==0)?? //如果文件為空則不進行讀取操作
???? ????? {
?????????? }
?????????? else
?????????? {
??????????????? CArchive ar(&file, CArchive::load);
??????????????? m_map.Serialize(ar);?? //讀取文件
?????????????? //根據文件內容填充列表框
???? ?????????? POSITION?? pos;
??????????????? CString??? strKey;
??????????????? CBank?? *pB=NULL;
??????????????? for( pos = m_map.GetStartPosition(); pos != NULL; )
??????????????? {
??????????????????? m_map.GetNextAssoc(pos,strKey,(CBank*)pB);
??????????????????? m_CmbBank.AddString(strKey);
??????????????? }
??????????????? delete? pB;
????????????? }
?????? }
?????? file.Close();
}

/*-------------------------------------------------
功能: 先打開文件,然后查找文件中是否有與編輯框關鍵字相同的內容,
??? ?? 如果有相同內容則不添加,如果沒有相同內容則寫文件.
------------------------------------- ------------*/

void CDlgBankList::OnBtnAdd() 
{
?????? // TODO: Add your control notification handler code here
?????? CString? strKey;
?????? GetDlgItemText(IDC_EDITBank,strKey);
?????? if (0 != strKey.GetLength())
?????? {
????????? CBank? *pB;
????????? //打開文件
????? ?? UINT? nFlags = CFile::typeBinary |CFile::modeRead;
????????? CFile file;
????????? CFileException fe;
????????? if (file.Open(_T("BankName.dat"),nFlags, &fe))
????????? {
???????????????? if(file.GetLength()==0)? //如果文件為空則不進行序列化操作
???? ??????????? {
???????????????? }
???????????????? else
???????????????? {
????????????????? CArchive ar(&file, CArchive::load);
????????????????? m_map.Serialize(ar); 
???????????????? }
?????????????? //分析文件并給文件添加編輯框的內容
???? ?????????? if(!m_map.Lookup(strKey,(CBank*)pB))? //當不存在時才需要添加
????? ??????????? {
????????????????????? if (CB_ERR != m_ListBox.AddString(strKey))
????????????????????? {
???????????????????????? m_map.SetAt(strKey, new CBank(strKey));? //給關鍵字strKey賦值
???? ???????????????? }
???????????????? }
????????? }
?????? file.Close();
?????? //存儲文件
????   nFlags = CFile::typeBinary |CFile::modeWrite;
?????? if (file.Open(_T("BankName.dat"),nFlags, &fe))
?????? {
??????????? CArchive ar(&file, CArchive::store);
??????????? m_map.Serialize(ar);?? //序列化存儲
????   }
??? }
}

/*-------------------------------------------------
功能: 先打開文件,然后查找文件中的關鍵字,
????找到后則刪除此關鍵字, 但是注意關鍵字對應的內容仍然沒有刪除，這點期待改進.
-------------------------------------------------*/

void CDlgBankList::OnBtnDel() 
{
?????? // TODO: Add your control notification handler code here
?????? int iIndex;?????? 
?????? CString? strKey;
?????? if(LB_ERR!=m_ListBox.GetCurSel())
?????? {
??????? //打開文件
?????& nbsp;???? UINT? nFlags = CFile::typeBinary |CFile::modeRead;
?????????? CFile file;
?????????? CFileException fe;
?????????? if (file.Open(_T("BankName.dat"),nFlags, &fe))
?????????? {
????????????? CArchive ar(&file, CArchive::load);
????????????? m_map.Serialize(ar);? 
????????????? iIndex=m_ListBox.GetCurSel();
????????????? m_ListBox.GetText(iIndex,strKey);
????????????? m_ListBox.DeleteString(iIndex);
????????????? //分析文件并給文件添加編輯框的內容
???? ????????? CBank? *pB=NULL;
????????????? if(m_map.Lookup(strKey,(CBank*)pB))
????????????? {
????????????????? m_map.RemoveKey(strKey);?? //刪除關鍵字,但沒有刪除關鍵字對應的內容
???? ????????? }
??????????? }
??????????? file.Close();
??????????? //存儲文件
????? ???? nFlags = CFile::typeBinary |CFile::modeWrite;
?????????? if (file.Open(_T("BankName.dat"),nFlags, &fe))
?????????? {
??????????????? CArchive ar(&file, CArchive::store);
??????????????? m_map.Serialize(ar);?? //序列化存儲
????? ???? }
?????? }
}