清除这个资料流的缓冲区，让所有缓冲资料全部写入档案。
Clears buffers for this stream and causes any buffered data to be written to the file.
系统告知您有档案变更，它将那些变更储存于元件所建立的缓冲区，并传递至 API。
The system notifies you of file changes, and it stores those changes in a buffer that the component creates and passes to the APIs.
建立或覆写具有指定缓冲区大小、档案选项和档案安全性的指定档案。
Creates or overwrites the specified file with the specified buffer size, file options, and file security.
建立或覆写具有指定缓冲区大小、档案选项和档案安全性的指定档案。
Creates or overwrites the specified file with the specified buffer size, file options, and file security.
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