Read a defined size block and skip a set size bytes in binary file

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Ivy Chen 2018-3-21

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https://ww2.mathworks.cn/matlabcentral/answers/389578-read-a-defined-size-block-and-skip-a-set-size-bytes-in-binary-file

评论： Walter Roberson 2018-3-21

I am trying to read a defined size block (A) and skip 8 bytes repeatedly close to the end of a binary file. Also want to skip a set size of bytes (end_skip) at end of file.

Have tried in a several way, but it does not seem to work out correctly.

Any suggestions?

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Answer 1

Walter Roberson 2018-3-21

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precision = '*uint8';
block_count = A;
skip_size_in_bytes = 8;
data = fread(fid, [1 block_count], precision, skip_size_in_bytes);

"Also want to skip a set size of bytes (end_skip) at end of file."

I do not understand that part? When you reach end of file, there are no bytes available to skip.

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Ivy Chen 2018-3-21

Thanks. We will not read until end of file, only to (end - skip_end_bytes).

How do I combine this with what you have above?

Walter Roberson 2018-3-21

Don't worry about it. fread() will stop when it gets to the end of file, returning the data that it was able to read. The file position for the purposes of ftell() will be left at the end of file, not at skip_size_in_bytes past the end of file.

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