MFC判断文件是否存在，不存在则创建+CSV文件操作

MFC判断文件是否存在，不存在则创建+CSV文件操作

	CString strFileName;
	SYSTEMTIME sysLocaltime;
	GetLocalTime(&sysLocaltime);
	strFileName.Format(_T("D:\\TestData\\%04i-%02i-%02i"), sysLocaltime.wYear
		, sysLocaltime.wMonth, sysLocaltime.wDay);
	//创建目录
	SHCreateDirectoryExW(NULL, strFileName, NULL);
	strFileName += _T("\\data.csv");

	int sign(0);
	try
	{
		CFileFind finder;
		//判断文件是否存在，存在返回true，不存在返回false
		BOOL bWorking = (bool)finder.FindFile(strFileName); 
		if (!bWorking)
		{
			//目录不存在
			sign = 1;
		}

		//创建文件
		CFile LPFile(strFileName, CFile::modeWrite | CFile::modeCreate | CFile::modeNoTruncate);

		LPFile.SeekToEnd();//到文件尾
		CStringA strbuf;
		if (sign == 1)//目录不存在，创建CSV文件时加入表头内容
		{
			strbuf.Format("登记日期,"); 
			strbuf.AppendFormat("姓名,");
			strbuf.AppendFormat("性别,");
			strbuf.AppendFormat("年龄");
			strbuf += ",\r\n";
			strbuf.AppendFormat("%04i-%02i-%02i %02i:%02i:%02i,", sysLocaltime.wYear, sysLocaltime.wMonth
				, sysLocaltime.wDay, sysLocaltime.wHour, sysLocaltime.wMinute, sysLocaltime.wSecond);
		}
		else//目录存在，直接在CSV文件中写入内容
		{
			strbuf.Format("%04i-%02i-%02i %02i:%02i:%02i,", sysLocaltime.wYear, sysLocaltime.wMonth
				, sysLocaltime.wDay, sysLocaltime.wHour, sysLocaltime.wMinute, sysLocaltime.wSecond);
		}
		strbuf += "小李,";
		strbuf += "女,";
		strbuf += "26";

		strbuf += ",\r\n";//换行
		LPFile.Write(strbuf.GetString(), strbuf.GetLength());//写入内容
		LPFile.Close();
	}
	catch (CException* e)
	{
		TCHAR szCause[255];
		e->GetErrorMessage(szCause, 255);
	}