Accessing Documents Directory

[aceiswild]

Hey guys i am trying to retrieve an image that is stored in my documents directory but keep receiving an unused variable error.

here is the line of code i am using:

 NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *applicationDocumentsDirectory = [documentsPaths objectAtIndex:0];

The image was saved from my firstViewController and I'm trying to receive it from documents in my secondViewController.

I have been playing around with the following line of code but with no luck:
imageWithContentsOfFile

Any suggestions?

Thanks,
SM

[BrianSlick]

Uh, so where is the code dealing with the image?

[Duncan C]

Originally Posted by aceiswild

Hey guys i am trying to retrieve an image that is stored in my documents directory but keep receiving an unused variable error.

here is the line of code i am using:

 NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *applicationDocumentsDirectory = [documentsPaths objectAtIndex:0];

The image was saved from my firstViewController and I'm trying to receive it from documents in my secondViewController.

I have been playing around with the following line of code but with no luck:
imageWithContentsOfFile

Any suggestions?

Thanks,
SM

My suggestion is to learn how to write a complete description of your problem so people can help you. What is the whole method that is giving you a warning? What line is giving a warning, and what is the exact text of the warning?

[aceiswild]

Originally Posted by BrianSlick

Uh, so where is the code dealing with the image?

Sorry, in my firstViewController the image saves fine to documents.

Here is the code in my secondViewController to load the image:

- (void)viewDidLoad {
    // self.view.backgroundColor = [UIColor redColor];

    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithContentsOfFile:@"Documents/Test.png"]];

    

    NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *applicationDocumentsDirectory = [documentsPaths objectAtIndex:0];

    
    [super viewDidLoad];
}

Im trying to load the image as the secondViewControllers background. I can early set it as a colour but not an image.

[BrianSlick]

Ok, so you load the image using a fake path, and then create a path to a directory. Which part are you not understanding would lead to failure?

[aceiswild]

Originally Posted by BrianSlick

Ok, so you load the image using a fake path, and then create a path to a directory. Which part are you not understanding would lead to failure?

Basically i am not understanding how to load an image from the documents directory.

This is how i am getting my image and saving it in my firstViewController.m:

- (void)buttonPressed:(UIButton *)button
{
	// Create image picker controller
  UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
  
  // Set source to the camera
	imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;;
  
  // Delegate is self
	imagePicker.delegate = self;
  
  // Allow editing of image ?
	imagePicker.allowsImageEditing = YES;
  
  // Show image picker
	[self presentModalViewController:imagePicker animated:YES];	

}

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
	NSError *error;

	// Access the uncropped image from info dictionary
	UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

  // Create paths to output images
  NSString  *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.png"];
  NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"];

  // Write a UIImage to JPEG with minimum compression (best quality)
  // The value 'image' must be a UIImage object
  // The value '1.0' represents image compression quality as value from 0.0 to 1.0
  [UIImageJPEGRepresentation(image, 1.0) writeToFile:jpgPath atomically:YES];

  // Write image to PNG
  [UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];

  // Let's check to see if files were successfully written...
  // You can try this when debugging on-device

  // Create file manager
  NSFileManager *fileMgr = [NSFileManager defaultManager];
   
  // Point to Document directory
  NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    
  // Write out the contents of home directory to console
  NSLog(@"Documents directory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]);

    
    	// Dismiss the camera
	[self dismissModalViewControllerAnimated:YES];
    
}


- (NSString *)applicationDocumentsDirectory {
    return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
}

Steve

[BrianSlick]

Ok, you're not getting my point. You are currently:

1. Loading an image
2. Creating a directory path

Isn't that backwards? And shouldn't the path be to a file?

[aceiswild]

Originally Posted by BrianSlick

Ok, you're not getting my point. You are currently:

1. Loading an image
2. Creating a directory path

Isn't that backwards? And shouldn't the path be to a file?

Well what i was trying to do is open the photo album in my firstViewController, select an image, when the image is selected it saves it to the documentsDirectory for later use like in my secondViewController.

Okay i will restart fresh with my problem:

I have a button that opens the photo gallery, This is the code that i am using to open the photo gallery, select an image and save it to documentsDirectory:

firstViewController.M

- (void)buttonPressed:(UIButton *)button
{
	// Create image picker controller
  UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
  
  // Set source to the camera
	imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;;
  
  // Delegate is self
	imagePicker.delegate = self;
  
  // Allow editing of image ?
	imagePicker.allowsImageEditing = YES;
  
  // Show image picker
	[self presentModalViewController:imagePicker animated:YES];	

}

- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
	NSError *error;

	// Access the uncropped image from info dictionary
	UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];

  // Create paths to output images
  NSString  *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.png"];
  NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"];

  // Write a UIImage to JPEG with minimum compression (best quality)
  // The value 'image' must be a UIImage object
  // The value '1.0' represents image compression quality as value from 0.0 to 1.0
  [UIImageJPEGRepresentation(image, 1.0) writeToFile:jpgPath atomically:YES];

  // Write image to PNG
  [UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];

  // Let's check to see if files were successfully written...
  // You can try this when debugging on-device

  // Create file manager
  NSFileManager *fileMgr = [NSFileManager defaultManager];
   
  // Point to Document directory
  NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
    
  // Write out the contents of home directory to console
  NSLog(@"Documents directory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]);

    
    	// Dismiss the camera
	[self dismissModalViewControllerAnimated:YES];

}


- (NSString *)applicationDocumentsDirectory {
    return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
}

Now in my secondViewController (view programatically created) i am trying to get that image that was saved to my documents directory and set it as the background in my secondViewController.

secondViewController.M

- (void)viewDidLoad {

    
    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithContentsOfFile:@"Documents/Test.png"]];

   
    NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *applicationDocumentsDirectory = [documentsPaths objectAtIndex:0];
    

    [super viewDidLoad];
}

I am getting an error stating: "Unused variable 'applicationDocumentsDirectory' "

I am not quite sure how to get the image out of my documents directory to display in my secondViewController as the background. I know i need to declare something in my secondViewController.H which i am still working on.

Hope this makes a little more sense all put together,

Thanks,
Steve

[BrianSlick]

Why do you think that applicationDocumentsDirectory relates to the image in any way?

[aceiswild]

Originally Posted by BrianSlick

Why do you think that applicationDocumentsDirectory relates to the image in any way?

Because i was thinking that is where the location of the images was saved.
So your saying, "applicationDocumentsDirectory" should be my image name?

[BrianSlick]

I'm saying compare what you did to save it with what you are doing here. And I can't keep stressing enough that you don't create the path until AFTER you load the image. That makes no sense.

[aceiswild]

Originally Posted by BrianSlick

I'm saying compare what you did to save it with what you are doing here. And I can't keep stressing enough that you don't create the path until AFTER you load the image. That makes no sense.

Ok thanks I will change some stuff around and give it another go!