Attempting to read the file directly into an XML parser results in an error.

如果试图将文件直接读入一个xml解析器，就会导致错误。

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The read function returns the number of bytes read (up to the maximum that you specify), -1 on error, or zero if the end of the file has been reached.

read 函数返回读取的字节数（最高为您指定的最大值）；或者 -1，表示错误；或者 0，如果已经到达文件末尾。

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Unable to read file due to Disk or Network error.

由于磁盘或网络错误而无法读取文件。

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