I have pulled an image out of the UIImagePicker thingy, and I would like to temporarily save it to the sandbox environment, in either the documents folder, or some other similar equivalent. However, I do not know how to do this, please could someone help me? Thanks
At the moment the image is a UIImage
Saving an image:
-(void)saveImage:(UIImage*)image{
NSString *imagePath = [NSHomeDirectory() stringByAppendingPathComponent:#"Documents/someImageName.png"];
[UIImagePNGRepresentation(image) writeToFile:imagePath atomically:YES];
}
Loading an image
-(UIImage)loadImage{
NSString *imagePath = [NSHomeDirectory() stringByAppendingPathComponent:#"Documents/someImageName.png"];
UIImage *image = [UIImage imageWithContentsOfFile:imagePath];
}
-(void)SaveImage
{
NSData *data;
NSArray *paths;
NSString *documentsDirectory,*imagePath ;
UIImage *image=[UIImage imageNamed:#"public.png"];
paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentsDirectory = [paths objectAtIndex:0];
imagePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"public.png"]];
data = UIImagePNGRepresentation(image);
[data writeToFile:imagePath atomically:YES];
}
Related
This question already has answers here:
Storing image in plist
(4 answers)
Closed 9 years ago.
I'm making an app where I take picture using camera and want to save those picture on plist so that i can use in future. I also want to retrive the saved images from plist and display them on imageview. There are multiple images.Please anyone can help me with this
Here is my code which I'm using for adding to plist
imageArray addObject:[NSString stringWithFormat:#"%#",imageView.image]];
[imageArray writeToFile:plistPath atomically:YES];
But when I'm trying to retrive image and set it on imageview I cant see image.
Thanks.
You can't save like this method to plist. The supported format are NSData, NSString, NSArray, NSDictionary, NSDate, and NSNumber. You can convert your UIImage into NSData and can write in plist.
To convert an image into NSData
NSData *data = UIImagePNGRepresentation(imageview.image);
[imageArray addObject:data];
[imageArray writeToFile:plistPath atomically:YES];
and also NSLog your file path to find where yoyr plist is saved.
Hope this helps !!!
see this one ,
For saving :
- (IBAction)saveImage {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:#"savedImage.png"];
UIImage *image = imageView.image; // imageView is my image from camera
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:savedImagePath atomically:NO];
}
For retrieving:
- (IBAction)getImage {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *getImagePath = [documentsDirectory stringByAppendingPathComponent:#"savedImage.png"];
UIImage *img = [UIImage imageWithContentsOfFile:getImagePath];
}
So I have a function which gets an image from a URL which looks like this:
- (UIImage *) getImageFromURL:(NSString *)fileURL {
UIImage * result;
NSData * img_data = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]];
result = [UIImage imageWithData:img_data];
return result;
}
and then a function which saves the image from a UIImage Which looks like this:
-(void) saveImage:(UIImage *)image withFileName:(NSString *)imageName ofType:(NSString *)extension inDirectory:(NSString *)directoryPath {
if ([[extension lowercaseString] isEqualToString:#"png"]) {
[UIImagePNGRepresentation(image) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.%#", imageName, #"png"]] options:NSAtomicWrite error:nil];
} else if ([[extension lowercaseString] isEqualToString:#"jpg"] || [[extension lowercaseString] isEqualToString:#"jpeg"]) {
[UIImageJPEGRepresentation(image, 1.0) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.%#", imageName, #"jpg"]] options:NSAtomicWrite error:nil];
NSLog(#"Image named %# wrote to %#", imageName, directoryPath);
} else {
NSLog(#"Image Save Failed\nExtension: (%#) is not recognized, use (PNG/JPG)", extension);
}
}
The issue I am facing is that when I run a UIImage through the saveImage function I dont think it is saving the image. This is because when I check for a UIImage imageNamed:#"Documents/filenamesavedas.jpeg" it returns (null). The image does however download correctly.
Here is my Documents Directory path function:
- (NSString *)getDocumentsDirectoryPath {
NSString * documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSLog(documentsDirectoryPath);
return documentsDirectoryPath;
}
Here is where I am downloading and trying to save the image:
dispatch_async(jsonQueue, ^{
// check to see if data authenticate runs successfully.
NSString *documentsDirectoryPath = [util getDocumentsDirectoryPath];
UIImage *imageToSave = [util getImageFromURL:[properties objectForKey:#"current_group_logoURL"]];
[util saveImage:imageToSave withFileName:[properties objectForKey:#"home_venue_logo"] ofType:#"jpeg" inDirectory:documentsDirectoryPath];
NSLog(#"Group Logo URL %#", [properties objectForKey:#"current_group_logoURL"]);
NSLog(#"Current Group Image %#", [properties objectForKey:#"home_venue_logo"]);
UIImage *testToSeeItHasDownloaded = imageToSave;
NSString *imageLocation = [documentsDirectoryPath stringByAppendingPathComponent:[properties objectForKey:#"home_venue_logo"]];
NSData *data = [NSData dataWithContentsOfFile:imageLocation];
UIImage *testToSeeImageHasSaved = [UIImage imageWithData:data];
NSLog(#"testToSeeImagehasDownloaded: %#", testToSeeItHasDownloaded);
NSLog(#"image location to save to: %#", imageLocation);
NSLog(#"testToSeeImagehasSaved: %#", testToSeeImageHasSaved );
});
The Console returns this:
2012-10-22 16:27:45.642 asdaf[46819:1d807] Group Logo URL http://somesite.com/50a0e42619424ba551a956511c098656.jpeg
2012-10-22 16:27:45.642 asdaf[46819:1d807] Current Group Image 50a0e42619424ba551a956511c098656.jpeg
2012-10-22 16:27:45.649 asdaf[46819:1d807] testToSeeImagehasDownloaded: <UIImage: 0xb09ed50>
2012-10-22 16:27:45.649 asdaf[46819:1d807] testToSeeImagehasSaved: (null)
testToSeeImagehasSaved should return null. But what am I doing wrong? Thanks.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//documentsDirectory is your documents directory path
//Now append your image name in this path
NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:#"ImageName.jpeg"];
//convert your image in NSData
NSData *imageData = UIImagePNGRepresentation(image);
//Now write it at path
[imageData writeToFile:imagePath atomically:NO];
You can get this image in same way
NSData *data = [NSData dataWithContentsOfFile:imagePath];
UIImage *image = [UIImage imageWithData:data];
Edit:
-(void)saveImage:(UIImage *)image withFileName:(NSString *)imageName ofType:(NSString *)extension
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *imageName = [imageName stringByAppendingString:extension];
//Note extension should be like .png, .jpg, .jpeg dont forget dot (.).
NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:imageName];
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:imagePath atomically:NO];
}
Well i dont now about your whole code but why you're passing an UIImage object when you have to save your image in documents directory. You can pass NSData as well in your method. You're doing more.
Your problem is you're saving .jpg image each time and at the time of retrieving you're trying to find .jpeg image on same path thats why you're getting null value. See this line in your saving method -
[UIImageJPEGRepresentation(image, 1.0) writeToFile:[directoryPath stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.%#", imageName, #"jpg"]] options:NSAtomicWrite error:nil];
this line doesn't look right to me:
UIImage *testToSeeImageHasSaved = [UIImage imageNamed: [#"Documents/" stringByAppendingString: [properties objectForKey:#"home_venue_logo"]]];
I think you have to do:
UIImage* image = [UIImage imageWithContentsOfFile:"YOUR_FILE_PATH"];
[UIImage imageNamed:"image_name"] is good only for images attached to your project
When you save it in the document folder, it does not exacly saves it in the "Document" directory but rather something like
path=/var/mobile/Applications/144B3628-5258-4939-8B80-006EC5BE45B2/Library/Caches/6_1.png
So to retreive your image you should use
NSString *uniquePath = [directory stringByAppendingPathComponent: filename];
image = [UIImage imageWithContentsOfFile: uniquePath];
where directory is the path you used to save it and filename the name of your jpeg.
[UIImage imageNamed:#"Documents/filenamesavedas.jpeg"]
Doesnt take paths it searches your bundle for the file with a specific name.
Locate the file using calls to NSFileManager and use the expected path and file name.
I need to check if an image exists in the project navigator. If it doesn't it needs to download it from the internet. The goal is to be able to use images like [UIImage imageNamed:#"23451.jpg"];
So I need to check if the image exists, if not download it. I tried to do this as followed:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//Set image
NSString *imagePath = [documentsDirectory stringByAppendingPathComponent:#"12345.jpg"];
//Check if the image exists at a given path
BOOL imageExists = [[NSFileManager defaultManager] fileExistsAtPath:imagePath];
//If the image doesn't exists download it.
if (!imageExists)
{
NSData* data = UIImageJPEGRepresentation([UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:#"www.mywebsite.com/12345.jpg"]]]);
[data writeToFile:imagePath atomically:YES];
}
If everything goes the right way the image is saved at the above path. But I still am not able to use this image with
[UIImage imageNamed:#"12345.jpg"];
I have got the feeling that i'm saving the images in a different directory than I should be saving them to.
Do you have any idea on how I should do this?
imageNamed will only work form image in the app bundle, not those stored in the Document directory. And you can't add the image to the app bundle, it readonly.
if (!imageExists)
{
NSData* data = UIImageJPEGRepresentation([UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:#"www.mywebsite.com/12345.jpg"]]]);
[data writeToFile:imagePath atomically:YES];
}
There is no need to do this, you are now JPG a JPG:
if (!imageExists)
{
NSData* data = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://www.mywebsite.com/12345.jpg"]];
[data writeToFile:imagePath atomically:YES];
}
NSData* data = [NSData dataWithData:UIImageJPEGRepresentation([UIImage imageWithContentsOfFile:imagePath], 0.8)];
[data writeToFile:imagePath atomically:YES];
I did something similar .. here are some excerpts of the code .. not the complete code ...
- (void)loadAndStoreImage{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSURL *theurlPortrait = [[NSURL alloc] initWithString:[[DataController sharedDataController].imageResponse objectForKey:#"portraitImageUrl"] ];
NSLog(#"Image url %# ",theurlPortrait);
imageDataPortrait = [NSData dataWithContentsOfURL:theurlPortrait];
[theurlPortrait release];
imagePortrait= [[UIImage alloc]initWithData:imageDataPortrait];
oldPathPortrait = [documentsDirectory stringByAppendingPathComponent:#"pt_wallpaper_1.png"];
NSURL *theurlLandscape = [[NSURL alloc] initWithString:[[DataController sharedDataController].imageResponse objectForKey:#"landscapeImageUrl"]];
imageDataLandscape = [NSData dataWithContentsOfURL:theurlLandscape];
[theurlLandscape release];
imageLandscape= [[UIImage alloc]initWithData:imageDataLandscape];
oldPathLandscape = [documentsDirectory stringByAppendingPathComponent:#"ls_wallpaper_1.png"];
[self replaceImages];
}
-(void)replaceImages{
//check if images were fully downloaded or corrupted.
if (isUserSignedIn) {
if (imageDataPortrait && imageDataLandscape) {
[UIImagePNGRepresentation(imagePortrait) writeToFile:oldPathPortrait atomically:YES];
[UIImagePNGRepresentation(imageLandscape) writeToFile:oldPathLandscape atomically:YES];
NSLog(#"IMAGES REPLACED");
NSDate *currentDate=[NSDate date];
[[ NSUserDefaults standardUserDefaults] setObject:currentDate forKey:#"previousDate"];
}
}
}
I am storing an image locally but my image is store in small size. i want to store this image in orignal size how can i do this ?
my code for store image is like this ..
NSString *myurl = [[NSString alloc]init];
myurl =[data valueForKey:#"large_image"];
NSData *mydata = [[[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:myurl]] retain];
UIImage *myimage = [[[UIImage alloc] initWithData:mydata] retain];
NSData *imageData = UIImagePNGRepresentation(myimage);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
// NSString *imageName = [NSString stringWithFormat:#"image.png",documentsDirectory];
NSString *fullPathToFile = [documentsDirectory stringByAppendingPathComponent:Imagename];
[imageData writeToFile:fullPathToFile atomically:YES];
this is stored image
and this is orignal image
i am doing wrong in code. this is the reason. why this happend.
may be it is because of leak ok knowledge that time. :)
other wise all things is correct only.
I am using a UIImagePickerController in my application.
After selecting an image by user,
image should be saved at application Documents Directory,
my Code is Give Below.
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
[picker dismissModalViewControllerAnimated:YES];
NSData *imgData = UIImagePNGRepresentation([info objectForKey:#"UIImagePickerControllerOriginalImage"]);
UIImage *img = [[UIImage alloc] initWithData:imgData];
stuImgView.image = img;
[img release];
//write image
NSString *imageFilename = [NSString stringWithFormat:#"%i.jpg", currentStudent.stuNo];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [NSString stringWithFormat:#"%#/%#", [paths objectAtIndex:0], imageFilename];
UIImage *stuImg;
BOOL success;
NSFileManager *fm=[NSFileManager defaultManager];
// how to store file at documents dir????
}
i dont know how to use file manager to store a file?
Help me Out.
Thanks in advance.
You can use writeToFile:atomically::
[imgData writeToFile:path atomically:NO];