Does Windows Move command delete the file only on successful completion?

Question

I will have scanned images with gray toned handwriting on white background.

What is the elegant way of selecting, and getting pixels of gray level(non-white) contigous areas?

Which image processing library should i use?

So far i research for a class and method in Leptonica, but found method names like: seedfill, i do not want to fill the area i want to get pixel coordinates that make the contigous area.

So can you also share class name with library name?

Thanks for reading and possible response.

Solution 1

Moving on the same logical disk: Windows simply moves the file-system references atomically. Very fast.

Moving on different logical disks: Windows performs a copy from one disk to the other, then deletes the file from the first disk, once successful.

Solution 2

Yes, it only deletes the file once it's finished copying.

Solution 3

You are correct -- Windows Move deletes only after a successful copy.

Solution 4

You are correct, Windows does copy, then delete. It wouldn't make sense from a filesystem point of view to remove chunks as they are copied when all the final delete needs to do is remove the file header.

If you want to test you could always try to send a large file across the network and yank the cable partway through.

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Comments

[surfasb]

Yes, this isn't the same as the Leopard bug.

[merveotesi]

I am using C++, but i think i can use Java through JNI, but i do not know if it is expensive about time or memory

[merveotesi]

Thanks for the reply, i am going to try opencv but i must use JNI for a different job, is it really a performance problem?

[Dario Seidl]

It is not necessarily a performance problem but it has a more or less noticable cost. It depends on what you do whit it (number of method calls, number and type of parameters). It's just that when you can use a C++ library, I would go with that.

[merveotesi]

ok, thanks, i do not have another choice for that different job, thus i am going to use JNI for it. Thanks

[Dario Seidl]

If you care about performance it will be better to stick with C++. Using JNI is definitely an overhead.

[merveotesi]

One more and last question, what is the best way to get the pixels in the contour, because if i understand right findContours returns frame of the contiguous area.

[Dario Seidl]

Yes, it will return the frames of contiguous areas. drawContours or fillPoly could help.