2024年4月15日 · A seek() operation moves that pointer to some other part of the file so you can read or write at that place. So, if you want to read the whole file but skip the first 20 bytes, open the file, seek(20) to move to where you want to start reading, then continue with reading the file.

2012年11月7日 · file.seek(offset[, whence]) Set the file’s current position, like stdio‘s fseek(). The whence argument is optional and defaults to os.SEEK_SET or 0 (absolute file positioning); other values are os.SEEK_CUR or 1 (seek relative to the current position) and os.SEEK_END or 2 (seek relative to the file’s end).

2023年10月14日 · Your parameters to seek are incorrect, seek takes 2 parameters, an offset (how many bytes) and whence which describes from where to seek (start:0, current:1, end:2). So what you need is: import io sessionRecord.seek(0, io.SEEK_END) Or: sessionRecord.seek(0, 2) # Py2 But you can avoid doing this by opening the file in append mode:

2012年2月27日 · Index Seek. When SQL Server does a seek it knows where in the index that the data is going to be, so it loads up the index from disk, goes directly to the part of the index that it needs and reads to where the data that it needs ends.

2013年7月25日 · In node.js the seek functionality is included in the read function. When you use the fs.read function, there is a parameter called position, that works as the seek position. If what you want is to write to the file, the function fs.write also has the position parameter.

However, this is only true for jumping to absolute offsets like Position = 0 and not relative offsets like Position += 0, in which case Seek seems slightly better. However, you should keep in mind that we are talking about performance of a handful of integer arithmetics and if checks, that's like not even accurately measureable with ...

2019年6月3日 · If whence is set to SEEK_SET, SEEK_CUR, or SEEK_END, the offset is relative to the start of the file, the current position indicator, or end-of-file, respectively. From the manpage of lseek: SEEK_SET The file offset is set to offset bytes. SEEK_CUR The file offset is set to its current location plus offset bytes.

2016年3月1日 · That happens because you must set the controlling index before calling Seek... With rstTemp ' Store current record location. theBookmark = .Bookmark ' Set the index. .Index = "PrimaryKey" '<- use your index name here .Seek "=", intSeek If you need to list the names of your table's indexes, you can examine its TableDef.Indexes collection. Here ...

2017年1月20日 · The (average) seek time is the time taken to switch to that position to any other position, with both (a) track and (b) sector. When positioned, the read can start. The disk RPM is into play for this, if it spins at 600rpm and has 100 sectors per track, it means that it …

2014年12月18日 · With this in mind, the very last byte of the file is the one found at (-1, SEEK_END) and thus the (-3, SEEK_END) byte is the 8. Note that this is consistent with how C usually handles this kind of thing.