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How to get files from a device using USB


How to get files from a device using USB

By : user3858201
Date : January 02 2021, 06:48 AM
Does that help There are two kinds of USB media providers. The USB Mass Storage devices that act just like drives and Windows Media Devices for simple cameras and portable media players.
Some camera (usually the cheap ones) only implement the Windows Media Device model while others implement the USB Mass Storage model.
code :


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How do I retrieve files or audio files programmatically from the device?

How do I retrieve files or audio files programmatically from the device?


By : William
Date : March 29 2020, 07:55 AM
will help you I want to know how to get the ringtone,audio files in the device and I want set them as alarm. How to do it? , Read the docs on RingtoneManager and Ringtone
Deleting files on SDCard; The device thinks the files don't exist even though they do

Deleting files on SDCard; The device thinks the files don't exist even though they do


By : user3138304
Date : March 29 2020, 07:55 AM
To fix this issue I see you're grabbing the external storage directory, but I don't see you checking it's state.
What does Environment.getExternalStorageState() return?
how to get files from iOS device or external device in iPad

how to get files from iOS device or external device in iPad


By : doris cao
Date : March 29 2020, 07:55 AM
it fixes the issue Use Dropbox. Place the files in a Dropbox folder and then with the iOS free Dropbox app, you can view the files in your iPhone/iPad.
How to get List of files/Upload/rename/write/read files in ios device programmatically?

How to get List of files/Upload/rename/write/read files in ios device programmatically?


By : Rathish P.S
Date : March 29 2020, 07:55 AM
hope this fix your issue First of all you should read NSFileManager concept in Apple Documentation then automatically you should know how to do this::
what you can access is within your app only, nothing more –
code :
(1).  #pragma mark
#pragma mark -- list all the files exists in Document Folder in our Sandbox.
- (void)listAllLocalFiles{
// Fetch directory path of document for local application.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

// NSFileManager is the manager organize all the files on device.
NSFileManager *manager = [NSFileManager defaultManager];
// This function will return all of the files' Name as an array of NSString.
NSArray *files = [manager contentsOfDirectoryAtPath:documentsDirectory error:nil];
// Log the Path of document directory.
NSLog(@"Directory: %@", documentsDirectory);
// For each file, log the name of it.
for (NSString *file in files) {
    NSLog(@"File at: %@", file);
}
}

(2). #pragma mark
    #pragma mark -- Create a File in the Document Folder.
 - (void)createFileWithName:(NSString *)fileName{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];

NSFileManager *manager = [NSFileManager defaultManager];
// 1st, This funcion could allow you to create a file with initial contents.
// 2nd, You could specify the attributes of values for the owner, group, and permissions.
// Here we use nil, which means we use default values for these attibutes.
// 3rd, it will return YES if NSFileManager create it successfully or it exists already.
if ([manager createFileAtPath:filePath contents:nil attributes:nil]) {
    NSLog(@"Created the File Successfully.");
} else {
    NSLog(@"Failed to Create the File");
}
}

(3). #pragma mark
     #pragma mark -- Delete a File in the Document Folder.
   - (void)deleteFileWithName:(NSString *)fileName{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// Have the absolute path of file named fileName by joining the document path with fileName, separated by path separator.
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];

NSFileManager *manager = [NSFileManager defaultManager];
// Need to check if the to be deleted file exists.
if ([manager fileExistsAtPath:filePath]) {
    NSError *error = nil;
    // This function also returnsYES if the item was removed successfully or if path was nil.
    // Returns NO if an error occurred.
    [manager removeItemAtPath:filePath error:&error];
    if (error) {
        NSLog(@"There is an Error: %@", error);
    }
} else {
    NSLog(@"File %@ doesn't exists", fileName);
}
}

(4). #pragma mark
     #pragma mark -- Rename a File in the Document Folder.
     - (void)renameFileWithName:(NSString *)srcName toName:(NSString *)dstName{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePathSrc = [documentsDirectory stringByAppendingPathComponent:srcName];
NSString *filePathDst = [documentsDirectory stringByAppendingPathComponent:dstName];
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePathSrc]) {
    NSError *error = nil;
    [manager moveItemAtPath:filePathSrc toPath:filePathDst error:&error];
    if (error) {
        NSLog(@"There is an Error: %@", error);
    }
} else {
    NSLog(@"File %@ doesn't exists", srcName);
}
}

(5).#pragma mark
    #pragma mark -- Read a File in the Document Folder.
   /* This function read content from the file named fileName.
   */
   - (void)readFileWithName:(NSString *)fileName{
// Fetch directory path of document for local application.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// Have the absolute path of file named fileName by joining the document path with fileName, separated by path separator.
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];

// NSFileManager is the manager organize all the files on device.
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]) {
    // Start to Read.
    NSError *error = nil;
    NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSStringEncodingConversionAllowLossy error:&error];
    NSLog(@"File Content: %@", content);

    if (error) {
        NSLog(@"There is an Error: %@", error);
    }
} else {
    NSLog(@"File %@ doesn't exists", fileName);
}
}

(6). #pragma mark
     #pragma mark -- Write a File in the Document Folder.
     /* This function Write "content" to the file named fileName.
      */
   - (void)writeString:(NSString *)content toFile:(NSString *)fileName{
// Fetch directory path of document for local application.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// Have the absolute path of file named fileName by joining the document path with fileName, separated by path separator.
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:fileName];

// NSFileManager is the manager organize all the files on device.
NSFileManager *manager = [NSFileManager defaultManager];
// Check if the file named fileName exists.
if ([manager fileExistsAtPath:filePath]) {
    NSError *error = nil;
    // Since [writeToFile: atomically: encoding: error:] will overwrite all the existing contents in the file, you could keep the content temperatorily, then append content to it, and assign it back to content.
    // To use it, simply uncomment it.
    //        NSString *tmp = [[NSString alloc] initWithContentsOfFile:fileName usedEncoding:NSStringEncodingConversionAllowLossy error:nil];
    //        if (tmp) {
    //            content = [tmp stringByAppendingString:content];
    //        }
    // Write NSString content to the file.
    [content writeToFile:filePath atomically:YES encoding:NSStringEncodingConversionAllowLossy error:&error];
    // If error happens, log it.
    if (error) {
        NSLog(@"There is an Error: %@", error);
    }
} else {
    // If the file doesn't exists, log it.
    NSLog(@"File %@ doesn't exists", fileName);
}

// This function could also be written without NSFileManager checking on the existence of file,
// since the system will atomatically create it for you if it doesn't exist.
  }
How to list all Block files, Character device files,pipe files,Socket files recursively with pure python codes instead o

How to list all Block files, Character device files,pipe files,Socket files recursively with pure python codes instead o


By : deleonard
Date : March 29 2020, 07:55 AM
With these it helps You have os.walk() already working there, so the missing piece is using the os.stat function and the stat module to figure out what type each file is.
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