This is similar to the file pointer for a file stream in standard C.
这类似于在标准c中为文件流创建FILE指针。
So we open a file stream and create a binary reader from it to access the DWG file.
因此,我们打开一个文件流并创建一个二进制读者从中访问DWG文件。
Furthermore, users do not need to care about the specific content of the file stream in the ODF package.
另外,用户不需要考虑OD f包中文件流的特定内容。
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