If the file does not exist (as determined by the file open error), write the "null" state to the file.
如果该文件不存在(由文件打开错误确定)，则把“null”状态写入文件。
In Listing 1, you'll find a short program that tries to open a file that is unlikely to exist and reports the error to whomever is running the program, using two different techniques.
在清单1中，您将看到一个简短程序，该程序尝试打开一个不太可能存在的文件，并使用两种不同的方法向运行该程序的用户报告错误。
Double-click the error to open persistence.xml file.
双击错误以打开persistence . xml文件。
Symptoms of one: you open a file or run a program, the hard disk load and repeated error, or effort to go through to succeed.
症状一：在你打开某一文件或运行某一程序时，硬盘反复读盘且出错，或者要经过九牛二虎之力才能成功。
An error occurred while attempting to open the Address Book file.
试图打开通讯簿文件时出错。
This function is typically used to open a specified file as one of the predefined streams: standard input, standard output, or standard error.
这个函数通常用于打开一个指定的文件使用预先定义的流：标准输入，标准输出，标准错误。
This error generally occurs when a search has been attempted with the search scope set to Current Document but no file is open.
当已执行搜索范围设置为“当前文档”的搜索，但没有打开的文件时，通常会发生此错误。
This error arises when you have attempted to open a file in the Open File dialog box or by right-clicking a file in Solution Explorer.
当尝试打开“打开文件”对话框中的某个文件，或右击解决方案资源管理器中的某个文件来打开它时，出现此错误。
Double-click any error message entry to open the file where the problem occurs, and move to the error location.
按两下任何错误讯息项目开启发生问题的档案，然后移动到错误的位置。
Double-click any error message entry to open the file where the problem occurs, and move to the error location.
按两下任何错误讯息项目开启发生问题的档案，然后移动到错误的位置。
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