I have images and I want to load them to my appplication.
my_app/lib/... - here my source files
my_app/assets/images/... - here my images
I need to get list of files in assets/images/ and after that show some of them (according to other logic)
I'm trying this
final dir = Directory("assets/images/");
print(dir.existsSync()); // <---- it also print: false
var files = dir.listSync().toList();
files.forEach((e) => list.add(MyImageItem(e.path)));
The problem is: I recieve exception
FileSystemException: Directory listing failed, path = 'assets/images/'
(OS Error: No such file or directory, errno = 2)
I've tried different ways: assets/images/, images/, images and so on
My pubspec.yaml
flutter:
assets:
- assets/images/
- assets/
When I create Image directly all is fine
new Image(image: AssetImage("assets/images/cat.png"))
I knew that previously (month ago) each resource has to be declared in pubspec.yaml directly, but now assets/images/ is ok.
I can load file by direct path. Why I can't access a directory? How to get list of files in directory to get them from my code?
When you add files to your assets, it means that you already know their paths.
Store all the images paths in a list and access them whenever you need.
For example if you have 3 images in
your_app/assets/images/image1.jpg
your_app/assets/images/image2.jpg
your_app/assets/images/image3.jpg
create a list and store all of them like:
List<String> imagePaths = ['assets/images/image1.jpg', 'assets/images/image2.jpg', 'assets/images/image3.jpg'];
and for example if you want to access your first image, use
AssetImage(imagePaths[0])
I keep a json file inside assets which records the file tree of assets folder.
When file list is needed, I just read from the json file.
Such json file can be easily generated by code.
However, this does not solve your problem directly when u have 5-10k images.
Only one json file might be too large to read.
Images should be grouped and recorded in separated json files.
Related
I am experiencing a funny problem: I am developing an ionic app, using cordova-plugin-file to store images. The resulting paths (URIs in form file:///...) are stored in a SQLite DB along with more information. When I install the app and use it, all works perfect. But if I update (or reinstall) the app, the old images are not found anymore, while newly added images work perfect.
I first suspected that the image files were being deleted on update, but I checked the content of the directory and the files are still there. (FYI: I am using file.dataDirectory/scans/ to place my files).
Then I thought that maybe I could go around the problem loading into img src a base64 blob loaded with cordova.file.readAsUrl(), but cordova.file does not find the file as well (I insist, the files are there, I checked with XCode).
So I checked further with cordova.file and it only finds files that are added after last app install, but the older files are still present in the directory.
Here my code:
private getImgSrcFromDocument(doc: Document): any {
const uri = doc.fileName;
const src = this.webView.convertFileSrc(uri);
const sanitized = this.sanitizer.bypassSecurityTrustUrl(src);
console.log({uri, src, sanitized});
return sanitized;
}
<img class="document_thumbnail" [src]="getImgSrcFromDocument(doc)">
I have already checked this, but is not my case.
By the way, the same code works perfect on Android.
Any idea what could be the problem?
Thanks in advance!
I found the reason why and the solution (very obvious when you know the problem):
Reason
On every new install, iOS renames the data directory for the app. The directory path has this form:
file:///var/mobile/Containers/Data/Application/ABC0000-1234-99DD-00FA-E835FEA/Library/NoCloud/
The hash in the middle is renewed on every install, so the stored full paths in DB are not valid anymore.
Solution
If you still can do it (no deploy yet, no real users), store only the relative path and complete it every time with this.file.dataDirectory (or wherever you wanted to store your files).
If you already have real users and want your update to 'find the files', just ignore the first part of the stored path and build it like before:
const ValidUri = this.file.dataDirectory + // The injected cordova-plugin-file
'relativeSubDirectories/' + // If you store your files in some subdirectory
this.document.storedFullPath.substr( // Take from fullPath only the filename
this.document.storedFullPath.lastIndexOf('/') + 1
);
Where storedFullPath is the string file:///var/mobile/....
After that, you still have to do the webView conversion and the sanitizing, like in the question above.
Hope this helps someone.
I'm trying to create link for the file upload. I'm calling file upload function from .cfc file. The file should be uploaded in a different folder. Here is what I get if after this code is executed in component.cfc page:
<cfset thisPath = ExpandPath( "./" ) />
C:\\wwwroot\\myapp\\components\\
I need to go level back in myapp and open bug folder. Then in a bug folder I need to direct the path either to folder1/ documents or folder2/documents. That will depend on the form field, here is example:
<cfset folder = trim(form.type) EQ 1 "folder1" : "folder2">
The path should either point to:
C:\\wwwroot\\myapp\\bug\\folder1\\documents\\
or
C:\\wwwroot\\myapp\\bug\\folder2\\documents\\
I'm looking for a solution that will work even if I roll this code to a different server with the same directory structure. Is there a good way to achieve this in ColdFusion?
I am using UIDocument to save a document file to the local storage sandbox in the Documents directory. I have another file in iCloud with the same name. How would I check if those two files are copies of the same document file or two different document files with the same name?
Using NSFileVersion doesn't tell me if they are the same file, just what version of the file it is.
I tried getting the resource values of the files, but the file in the local storage sandbox gives me nil as the document identifier.
Here is code using the documentIdentifier resource value:
let localFileResourceValues = try? self.document!.fileURL.resourceValues(forKeys: [URLResourceKey.documentIdentifierKey])
let iCloudFileResourceValues = try? destinationURL.resourceValues(forKeys: [URLResourceKey.documentIdentifierKey])
print("documentIdentifier", localFileResourceValues?.documentIdentifier as Any, iCloudFileResourceValues?.documentIdentifier as Any, localFileResourceValues?.documentIdentifier == iCloudFileResourceValues?.documentIdentifier)
Print results:
documentIdentifier nil Optional(133819) false
Is it possible to get an NSMetadataItem from a file in the local storage sandbox?
I would appreciate any help.
To find out if the two file paths point to the same file object, you need to normalise the file paths by using NSString stringByStandardizingPath, then resolve symbolic links by using NSString stringByResolvingSymlinksInPath:, and then compare the paths. This web page has a good description and ready-to-go code.
To find out whether two files have the same contents, even while they might be different file objects, then NSFileManager contentsEqualAtPath:andPath: is useful.
I'm using Grails 2.5.6 to store uploaded images to folder on a server.
The following are my code to store the image
mpr.multiFileMap.file.each{fileData->
CommonsMultipartFile file = fileData
File convFile = new File(file.getOriginalFilename());
file.transferTo(convFile);
/** Processing File **/
File uploadedFile = new File("${directory}${generatedFileName}.${extension}")
convFile.renameTo(uploadedFile)
}
I have no problem running on development (MacOSX High Sierra)
But when i deployed on production (Ubuntu 14.04 server), i could not save the file outside CATALINA_HOME directory.
I have checked the permission and ownership of the destination directory, but still, the directory was created but the file was never stored.
For Example, i've tried to store the file on /home/tomcat/ directory (/home directory was in separate partition with tomcat which stored it /var), the directory was created, but the file was never stored.
When i put the destination directory within CATALINA_HOME folder, everything works fine. But this was not the scenario i want to do.
You say your destination directory is on another partition, so maybe another filesystem is used on this partition.
Or if you look on the javadoc of the renameTo method it is said :
Many aspects of the behavior of this method are inherently
platform-dependent: The rename operation might not be able to move a
file from one filesystem to another, it might not be atomic, and it
might not succeed if a file with the destination abstract pathname
already exists. The return value should always be checked to make
sure that the rename operation was successful.
...
#return true if and only if the renaming succeeded;
false otherwise
Thus I think the renameTo method is not able to move the file, don't know why but you can rewrite your code like this :
mpr.multiFileMap.file.each{fileData->
CommonsMultipartFile file = fileData
File uploadedFile = new File("${directory}${generatedFileName}.${extension}")
// String originalFilename = file.getOriginalFilename()
// you can store originalFilename in database for example
if(!uploadedFile.getParentFile().exists()) {
uploadedFile.getParentFile().mkdirs()
// You can set permissions on the target directory if you desired, using PosixFilePermission
}
file.transferTo(uploadedFile)
}
Using Rails 3.2, carrier wave, and recently switched to store on Amazon S3. My setup and uploads are all working fine.
1. I have image_uploader.rb to upload and store images. Displaying them all works fine
2. I have file_uploader.rb to upload and store files. I've even taken it a step further to upload ZIP files and extract a version so that both the ZIP file and TXT files are stored in the correct place on S3.
My problem is I run a method on the TXT file. In the past, I used storage :file
With that I was able to:
Dir.chdir("public/uploads/")
import_file = Dir['*.TXT'].first
f = File.new(import_file)
Now, that I'm using storage :fog I can't get seem to retrieve/File.new/Open the file.
I see the file with the usual commands:
#upload1.team_file # stored file
#upload1.team_file.url # url
#upload1.team_file_url(:data_file).to_s # version created
I've been pouring through all kinds of very limited leads on retrieving and/or opening the file, but everything I try seems to return errors, such as:
Errno::ENOENT: No such file or directory - https://teamfiles.s3.amazonaws.com/data_files…
Thoughts on the difference here of retrieving and USING a file from AmazonS3? Thanks!
Pulling from multiple threads, APIs, etc. I'm answering my own question with what I've found. I welcome any corrections or improvements:
To retrieve carrierwave files uploaded to AmazonS3, you have to understand that open(#upload.file_url) or File.open(#upload.file_url) does NOT open the file, it only opens the PATH to the file. (ref: Ruby OpenURI )
I use: open_uri_url = open(#upload.file_url)
You then have to find the specific file in that path that you want. For me, I then find a ZIP file that was uploaded to AmazonS3 and Extract the specific file within the ZIP file that I want with a unique *.ABC extension:
zip_content_file = Zip::File.open(open_uri_url).map{|content| content if content.to_s.split('.').last == "ABC"}.compact.first
Now, from here, where to extract to?? I create a unique directory in the Rails tmp directory to extract the file to, use it and then delete the directory:
tmp_directory = "tmp/extracts/#{#upload.parent_id}/"
FileUtils.mkdir_p(tmp_directory) unless File.directory?(tmp_directory)
extract = zip_content_file.extract(tmp_directory + content_file.to_s)
Now with found from the AmazonS3 stored ZIP file and extracted, I can open, read, etc:
f = File.new(tmp_directory + extract.to_s)
I hope this helps with Carrierwave, AmazonS3, ZIP files and using them once uploaded.