In VC++, how should I check if a directory is empty?
Is there any function? I am a novice here.
Use PathIsDirectoryEmpty method.
You could use some methods like FindFirstFile and FindNextFile to check if there are any files in the directory.
Also see this:
If the directory is empty,
FindFirstFile() will only find the
entry for the directory itself (".")
and FindNextFile() will fail with
ERROR_FILE_NOT_FOUND.
Related
As I review these file system flags, I'm I correct in concluding that there is no flag you can pass to fs.promises.writeFile that will automatically create all missing directories leading up to a filename? If not, which flag does this?
I don't like solutions that check for the existence of the folders first before attempting writeFile, because after the folders are created that check happens every time you write to a file in that folder.
In my program, after the folders are created once, it should always be there, so it seems more efficient to only create the folders if there is an exception. However, I'm hoping there is a flag that avoids all this micro-management.
If a flag for auto-creating the folders doesn't exist for writeFile, then I'd like to attempt writeFile first, and then (only if there is an exception) create the folders recursively.
fs.promises.writeFile() does not automatically create the directory structure for you. That must exist first.
If you want to automatically create the path because you received an error indicative of a path problem, you can use fs.promises.mkdir() and pass the recursive flag.
And you could, of course, create your own wrapper function that calls fs.promises.writeFile() and if it gets whatever error you get when the path doesn't exist (you'd have to test to see exactly what that error is), then call fs.promises.mkdir() and then repeat the fs.promises.writeFile(). It could all be wrapped in your own utility function.
I'm setting up a new algorithm and I want to share it on another computer. How can I set paths with only the folder name, for example.
I've tried to use the function os.chdir(path), but I don't achieve to reach my folder when I'm not using a 'root path' like C:/../../folder.
os.chdir(../folder_name)
By doing os.chdir(../folder_name), you are referring to the parent dir of the current directory.
You probably are looking for the os.chdir(./folder_name), with one dot? This is the current directory, where your script stands.
More here: https://learn.microsoft.com/en-us/dotnet/standard/io/file-path-formats
Update: After clarification in the comments, you want to refer to folder_name from one of its subfolder (/folder_name/library). Then it is indeed .. that you should use, but .. only:
os.chdir(..)
I have started working with the libzip library today. But I do not understand the principle how libzip works.
My focus is on zipping a directory with all the files and dirs within
into a zip-file.
Therefore, I started with zip_open(), then I read the directory
contents and add all the dirs with zip_dir_add() to the archive.
After that, I closed the zip-file with zip_close(). Everything was
fine. The next step should be to add all the files to the archive with
zip_file_add(). But it doesn't work. The last step closing the file
fails.
OK, I forgot to create a zip_source to get this done. I added a
statement a line before to get this source (zip_source_file()). But
still it doesn't work.
What is wrong in my thinking? Do I have to fopen() and fclose() the file on the filesystem also?
And what is the difference between zip_source_file() and zip_source_filep()?
Do I have to fopen() and fclose() the file on the filesystem also?
No, you can just use zip_source_file().
From your comments I think you have the right general idea, but there is probably some detail that is making it fail. Make sure you perform all the error checking the documentation suggests after each libzip call so you can get more information about what is causing it to fail.
You could also compare your code with https://gist.github.com/clalancette/bb5069a09c609e2d33c9858fcc6e170e
I don't want to specify the full directory of a folder or object within my program. I do not want to do this because if a user decides to change the installation folder, it will not function properly. I've seen in HTML you can do something like: ./folder/directory/name and it would work perfectly fine. Is there a way to do something like that within Python?
From https://docs.python.org/3/reference/datamodel.html
__file__ is the pathname of the file from which the module was loaded
You may find it helpful to apply os.path.abspath() to '.' or __file__.
How can I get the current user path in Linux? It can be either with the GTK+ framework APIs, or plain C++.
Assuming you mean the current directory of the process:
The plain POSIX C function is getcwd().
In glib, there's also g_get_current_dir().
If you want to get home directory use getenv("HOME")
g_get_home_dir() from Glib is more cross-platform than getenv("HOME"). It also prefers /etc/passwd entries over the HOME variable for various reasons discussed at the aforementioned link.
Not sure whether you're wanting the contents of $PATH or the user's current working directory. However to cover both options...
PATH is an environment variable, so you can access this with getenv(), in this instance getenv("PATH"), and is defined in <stdlib.h>.
The current working directory can be obtained with getcwd(), and is defined in <unistd.h>.