Boost Beast Translation (zh_Hans)/Doc / Qbk / 04 Http / 09 Custom Body (qbk)

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22 string ID 112
	Source string description type: paragraph

	English We will start with the definition of the `value_type`. Our strategy will be to store the file object directly in the message container through the `value_type` field. To use this body it will be necessary to call `msg.body.file().open()` first with the required information such as the path and open mode. This ensures that the file exists throughout the operation and prevent the race condition where the file is removed from the file system in between calls. 460/10000 · 460
23 string ID 122
	Source string description type: paragraph

	English Our implementation of __BodyWriter__ will contain a small buffer from which the file contents are read. The buffer is provided to the implementation on each call until everything has been read in. 196/10000 · 196
24 string ID 128
	Source string description type: paragraph

	English And here are the definitions for the functions we have declared: 64/10000 · 64
25 string ID 132
	Source string description type: paragraph

	English Files can be read now, and the next step is to allow writing to files by implementing the __BodyReader__. The style is similar to the writer, except that buffers are incoming instead of outgoing. Here's the declaration: 219/10000 · 219
26 string ID 139
	Source string description type: paragraph

	English Finally, here is the implementation of the reader member functions: 67/10000 · 67
27 string ID 143
	Source string description type: paragraph

	English We have created a full featured body type capable of reading and writing files on the filesystem, integrating seamlessly with the HTTP algorithms and message container. The body type works with any file implementation meeting the requirements of __File__ so it may be transparently used with solutions optimized for particular platforms. Example HTTP servers which use file bodies are available in the example directory. 420/10000 · 420
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