修复文件管理对话框崩溃的缺陷

非模态的文件管理对话框在关闭时需要析构，但是这导致2次打开后再关闭时崩溃，该缺陷已修复。

server/2015Remote/FileManagerDlg.cpp

@@ -32,6 +32,8 @@ CFileManagerDlg::CFileManagerDlg(CWnd* pParent, CIOCPServer* pIOCPServer, Client
 {
 	//{{AFX_DATA_INIT(CFileManagerDlg)
 	//}}AFX_DATA_INIT
+	m_bIsClosed = false;
+	m_ProgressCtrl = NULL;
 	SHFILEINFO	sfi;
 	SHGetFileInfo
 		(
@@ -929,6 +931,8 @@ void CFileManagerDlg::OnClose()
 	closesocket(m_pContext->m_Socket);
 
 	CDialog::OnClose();
+	m_bIsClosed = true;
+	//delete this; //<2F>˴<EFBFBD><CBB4>ͷ<EFBFBD><CDB7>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD>ڵ<EFBFBD>2<EFBFBD>α<EFBFBD><CEB1><EFBFBD>
 }
 
 CString CFileManagerDlg::GetParentDirectory(CString strPath)