使用CRichEditCtrl的stream功能读写文件

网上的有些毛病
DWORD CALLBACK WriteFileCallBack(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG FAR* pcb)
{
CFile *pFile = (CFile*)dwCookie;
try
{
pFile->Write(pbBuff, cb);
*pcb = cb;
}
catch(CFileException* pEX)
{
pEX;
*pcb = 0;
return 1;
};

return 0;
}

DWORD CALLBACK ReadFileCallBack(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG FAR* pcb)
{
CFile *pFile = (CFile*)dwCookie;
try
{
*pcb = pFile->Read(pbBuff, cb);
}
catch(CFileException* pEX)
{
pEX;
*pcb = 0;
return 1;
};

return 0;
}

void CMyRichEditVIew::OnOpen()
{
if(!sFileName.IsEmpty()) {
CFile file(sFileName, CFile::modeRead | CFile::typeBinary);
EDITSTREAM stream;
stream.dwCookie = (DWORD)&file;
stream.pfnCallback = ReadFileCallBack;
GetRichEditCtrl().StreamIn(SF_TEXT, stream);
file.Close();

}
}

void CMyRichEditVIew::OnSave()
{
if(!sFileName.IsEmpty()) {
CFile file(sFileName, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);
EDITSTREAM stream;
stream.dwCookie = (DWORD)&file;
stream.pfnCallback = WriteFileCallBack;
GetRichEditCtrl().StreamOut(SF_TEXT, stream);
file.Close();
}
}

void CMyRichEditVIew::OnFileOpen()
{
// TODO: Add your command handler code here
CString fileName; //打开的文件名
//文件过滤器，打开文件时，文件列表中只出现过滤后的文件
static TCHAR szFilter[] = _T("文本文件 (*.log)|*.log|Rich Text Format (*.rtf)|*.rtf|全部文件 (*.*)|*.*||");
CFileDialog cfDlg(TRUE,NULL,_T("*.log"),OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,szFilter,this);
if(cfDlg.DoModal() == IDOK)
fileName = cfDlg.GetFileName();
else
return;

//检查文件类型
int pos = fileName.Find(_T("."),0);

int extlength = fileName.GetLength() - pos -1;
CString fileType = fileName.Mid(pos+1,fileName.GetLength() - pos -1);

//打开文件
if(fileType.CompareNoCase(_T("log")) == 0)
{
CSerialLogDiffDoc * pDoc = (CSerialLogDiffDoc*)GetDocument();
pDoc->SetTitle(fileName);

SetFileName(fileName);
OnOpen();
ClearModifyFlag();

Parse();
}

}

void CMyRichEditVIew::OnFileSave()
{
// TODO: Add your command handler code here
CString fileName; //打开的文件名
//文件过滤器，打开文件时，文件列表中只出现过滤后的文件
static TCHAR szFilter[] = _T("文本文件 (*.log)|*.log|Rich Text Format (*.rtf)|*.rtf|全部文件 (*.*)|*.*||");
CFileDialog cfDlg(FALSE,NULL,_T("*.log"),OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,szFilter,this);
if(cfDlg.DoModal() == IDOK)
fileName = cfDlg.GetFileName();
else
return;

//检查文件类型
int pos = fileName.Find(_T("."),0);

int extlength = fileName.GetLength() - pos -1;
CString fileType = fileName.Mid(pos+1,fileName.GetLength() - pos -1);

//打开文件
if(fileType.CompareNoCase(_T("log")) == 0)
{
CSerialLogDiffDoc * pDoc = (CSerialLogDiffDoc*)GetDocument();
pDoc->SetTitle(fileName);

SetFileName(fileName);
OnSave();

ClearModifyFlag();
}
}