I'm writing a Fantom program to copy files from one directory to another. I'm using File.copyTo method. Something like this:
File( `file.txt` ).copyTo( File( `copy.txt` ) )
The problem is that the resulting copy gets its creation and modification times set to the current system time, not the times of the source file, such as doing:
cp file.txt copy.txt
The behaviour I want is this instead:
cp -p file.txt copy.txt
where the file attributes of the source are also copied to the destination file, including creation and modification times.
I'm currently using an OS command to reset the times of the copy, but this is less than ideal, and not very portable. This is what I'm doing for macOS, where timestamp is a DateTime instance with the original creation time:
Is there any way of doing this using only Fantom, please?
SlimerDudeSun 29 May 2022
Hi, there's nothing that I've used (or know of) in Fantom, but this StackOverflow post says it can be done in Java using Files.copy().
The corresponding Fantom code would look something like this:
using [java] fanx.interop::Interop
using [java] java.nio.file::Files
using [java] java.nio.file::StandardCopyOption
...
Files.copy(
Interop.toJava(`src.txt`.toFile).toPath,
Interop.toJava(`dst.txt`.toFile).toPath,
[StandardCopyOption.COPY_ATTRIBUTES]
)
Both solutions work nicely. Thank you both. I ended up using the modified field (I don't know why I assumed it was a read-only field when I first saw it). Now I'm doing:
Thank you Steve for providing the example showing JavaFFI and Interop usage. It's something I haven't used before, but I'm pretty sure it will come handy soon.
LightDye Sat 28 May 2022
Hi all,
I'm writing a Fantom program to copy files from one directory to another. I'm using File.copyTo method. Something like this:
The problem is that the resulting copy gets its creation and modification times set to the current system time, not the times of the source file, such as doing:
The behaviour I want is this instead:
where the file attributes of the source are also copied to the destination file, including creation and modification times.
I'm currently using an OS command to reset the times of the copy, but this is less than ideal, and not very portable. This is what I'm doing for macOS, where
timestampis a DateTime instance with the original creation time:Is there any way of doing this using only Fantom, please?
SlimerDude Sun 29 May 2022
Hi, there's nothing that I've used (or know of) in Fantom, but this StackOverflow post says it can be done in Java using Files.copy().
The corresponding Fantom code would look something like this:
using [java] fanx.interop::Interop using [java] java.nio.file::Files using [java] java.nio.file::StandardCopyOption ... Files.copy( Interop.toJava(`src.txt`.toFile).toPath, Interop.toJava(`dst.txt`.toFile).toPath, [StandardCopyOption.COPY_ATTRIBUTES] )brian Sun 29 May 2022
Note that
sys::File.copyIntowill copy file permissions. I don't think it does timestamps, butsys::File.modifiedis a field you can set.LightDye Sun 29 May 2022
Hi Brian, Steve,
Both solutions work nicely. Thank you both. I ended up using the
modifiedfield (I don't know why I assumed it was a read-only field when I first saw it). Now I'm doing:and that does exactly what I need.
Thank you Steve for providing the example showing JavaFFI and Interop usage. It's something I haven't used before, but I'm pretty sure it will come handy soon.