Workaround for fake file in memory?

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Ray Lee
Ray Lee 2015-9-7
回答： Walter Roberson 2015-9-7
I have a mex function which reads data from a file and process it
result = mex_process_data(string_path_to_file);
The data is downloaded from website directly using
data = urlread2(url);
Now I save the data to a file and pass the filepath to the mex function. The IO is time-wasting. Is there a way to pass the data directly to the mex function without saving it to a temporary file (using Java class?)?

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Walter Roberson
Walter Roberson 2015-9-7
urlread2 is from the File Exchange . It outputs a string, not a file. If you are writing to a file then that is in your own code.
If the mex requires a filename instead of a string, then change the mex. Or write to an solid state drive, or to a ramdisk.

更多回答（2 个）

Image Analyst
Image Analyst 2015-9-7
I don't think so. If the mex file was written to accept a text string that represents a filename, then you're stuck with that. If you want it to accept a numerical array then you'd have to rewrite the mex code to do that.
Guillaume
Guillaume 2015-9-7
There's nothing built into matlab for this and yes, it would be nice if matlab io supported streams instead of just concrete files.
The only way I can think to work around this (short of rewriting your mex so it does the url fetching itself) is to implement a ram drive.

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