Before anyone down votes my question, I have literally looked all over stack and cannot find the answer
I am making a phonegap app which I can place an image into my filesystem
the url :
file:///Users/danielnasello/Library/Application Support/iPhone Simulator/7.0.3/Applications/75EE3563-560D-4CFD-B357-313DD559573D/Documents/Vault/1386252707450.jpg
I can then pass this url to my modal controller to present an image in the image view.
the problem is I cannot seem to find the correct way to access the image from my filesystem and display it into my image view.
my current relevant code
(self.myImage) is the string i pass from phonegap. it does contain the url string because I am logging it, so I know the url is getting passed. However, the image simply will not display.
I tried using image named from one of my library images and it works fine. I just cant seem to find the correct way to present it using file url.
NSURL *url = [NSURL URLWithString:self.myImage];
NSData *data = [NSData dataWithContentsOfURL:url];
img = [[UIImage alloc] initWithData:data];
self.imageView.image= img;
here is the code for that.
NSString *filepath=[[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:#"1386252707450.jpg"];
self.imageView.image=[UIImage imageWithContentsOfFile:filepath];
this code is actually correct. It just doesn't work on simulators (shocker), you need a real device
Related
I want to display an image on UIImageView calling the Web server image.
Because I want to replace and show it right away.
here's the code
NSURL *imageURL = [NSURL URLWithString:urlString];
NSData *imageData = [NSData dataWithContentsOfURL:imageURL];
webImage.image = [UIImage imageWithData:imageData];
The problem is...
The image is displayed well at first,
but if I replaced the image on the web server with another image.(The file name is the same, only the file is replaced) It didn't change and still displayed the first image.
Please help me...
The code in the question seems flawed, i.e. you apparently do a network request in the UI thread. Such approach tends to make your application UI unresponsive. However, if we boil down the question to "Why NSData returns outdated data for the same URL?" then the answer is because it has internal caching. The caching logic could controlled either by the the response headers from the server (e.g. Expires) or with NSDataReadingUncached option (to suppress any caching logic):
NSData *data = [NSData dataWithContentsOfURL:url options:NSDataReadingUncached error:nil];
I am saving an image from to my apps directory, and when I try to retrieve it with imageWithContentsOfFile it returns a nil image. I have verified that the file exists in the apps container and that the path I use is correct. Any ideas?
If there is any code that you need let me know. I am not sure what you would need to see.
Thanks
BTW here is the exact syntax I use for loading the image from the path.
UIImage *image = [UIImage imageWithContentsOfFile:path];
The first thing you should do is to check is it a file input/output issue or an image issue. So try to read your file data with
NSData *fileData = [NSData dataWithContentsOfFile:path];
If fileData is nil or its length is 0 then you should recheck the path and the way you are storing a data.
If fileData is ok try
image = [[UIImage alloc] initWithData:fileData];
to check a data to image conversion. Is it possible to open file with some MacOS image viewer?
i'm using quicklook to preview an image saved locally. when i run the app, quicklook read the right file and has the right image memory but doesn't preview it. it shows me something like this.
in my code i'm passing an NSURL to this delegate method
(id)previewController:(QLPreviewController *)previewController previewItemAtIndex:(NSInteger)idx
so i guess everything is in place. but what could i missing?
EDIT:
to creath the path i do it by the following:
filePath = [NSString stringWithFormat:#"%#/LeBaccPictureDownloadedTemperoraly", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]];
and in the delegate method i mentioned i return the url by this:
[NSURL fileURLWithPath:filePath];
does filePath = [#"~/Documents/LeBaccPictureDownloadedTemperoraly" stringByExpandingTildeInPath]; change anything? Does the file have an extension? Try to show the file in an UIImageView to make sure the file is not broken. Whatch the file format xD
Like this?
I have a webview which i want to load using the loadHtmlString method. The problem is that I want to be able to change the img src's with images that i have previously downloaded. I also use google analitics in the html so I need to set the baseUrl to the actual url so it will work. Here comes the problem. If I put the baseUrl in, the images will not load. If I don't set the baseUrl, it works. How can I get around this, so I will be able to both use google analitycs and have the images store locally in my application? I would prefer not having to implement the google analitics sdk in my project.
A strange thing is that if I run it in simulator, and not put the "http://" prefix in front of my baseUrl, it works fine. However, when I run it on a device, I receive the following error and it doesn't work:
Domain=WebKitErrorDomain Code=101 "The URL can’t be shown"
Thanks
EDIT
If I do this, it works:
[appsWebView loadHTMLString:htmlString baseURL:nil];
However, I must provide a baseURL in order to have Google Analitics working, I have two further cases:
This one gives the above mentioned error: (it works ok in simulator but gives error when running on device)
[appsWebView loadHTMLString:htmlString baseURL:[NSURL urlWithString:#"test.com"]];
This one simply doesn't show anything: (neither loads the html string or the url)
[appsWebView loadHTMLString:htmlString baseURL:[NSURL urlWithString:#"http://test.com"]];
I incorrectly assumed that the problem was that the local image was not fully specifying the full path, but that does not appear to be the problem here. But, you are quite right that it appears (somewhat surprisingly) that you cannot specify some web-based baseURL and also reference a local image in your HTML string. No simple solutions are leaping out at me, but at the very least, it appears that you might have a couple of (not very good) options:
First, you could base64 encode the local image using some base64 library like Mike Gallagher's NSData+Base64 category, e.g.:
NSData *imageData = [NSData dataWithContentsOfFile:imagePath];
NSString *imageDataBase64 = [imageData base64EncodedString];
NSString *imageHtml = [NSString stringWithFormat:#"<img src='data:image/png;base64,%#'>", imageDataBase64];
This slows the initial rendering, but maybe it's better than nothing.
Second, you could always try leaving the baseURL as nil, removing the JavaScript that does the Google Analytics from the HTML string, and then try injecting that JavaScript via stringByEvaluatingJavaScriptFromString. This approach may or may not work depending upon the complexity of the Google Analytics JavaScript (e.g. what further web-based references it might have), but there's a outside chance you might be able to do something that way.
My apologies for assuming the problem was a trivial img URL. Clearly you had identified a more fundamental issue.
Original answer:
Create your image URLs in your HTML string to be fully qualified file URLs within your local file system:
The image is either in Documents:
NSString *documentsPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
NSString *imagePath = [documentsPath stringByAppendingPathComponent:imageName];
Or in the bundle:
NSString *imagePath = [[NSBundle mainBundle] pathForResource:imageName
ofType:nil];
But, once you have fully qualified path, you should be able to use that:
NSURL *imageUrl = [NSURL fileURLWithPath:imagePath];
NSString *imageHtml = [NSString stringWithFormat:#"<img src='%#'>", imageUrl];
I would bet it's a casing issue. Take into account that the Device is case sensitive whereas the Simulator is not. Check the URL and make sure it contains the right characters.
This is my first real project. I have an app that captures several seconds of video using AVFoundation, outputs this to a file in the documents directory and lets the user preview the video before they upload it using HTTP and a PHP script on my website.
All the video capture and preview work perfectly but I am stuck on uploading the video file.
I learnt a lot from this simpleSDK video which shows how to achieve the desired effect using a video file stored in the apps main bundle.
The code from the tutorial that set up videoData ready to upload originally looked like this:
NSData *videoData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"Movie" ofType:#"mov"]];
NSString *urlString = #"http://www.iphonedevnation.com/video-tutorial/upload.php";
The filename of the video file that I need to upload is always unique and generated using CFUUIDCreateString. I join this string to the path for the documents directory, add ".mov" to the end of it and save it into a text file for retrieving later.
This all works as I am able to retrieve the filename from the file and use it to preview the movie clip elsewhere in the app.
My path is in an NSString, that I have tried converting to NSURL and removing the file suffix to get it to work with the NSData *videoData.........line but it doesn't compile, I get an "No known class method for selector 'dataWithContentsOfFile:ofType.' error. I am targeting iOS 5 and using Xcode 4.3 with ARC and Storyboards.
I've been at this for best part of 5 hours now so hopefully someone can help. My code, which included tips from elsewhere on converting from a NSString to NSURL follows:
NSString *content = [[NSString alloc] initWithContentsOfFile:lastSavedTalentFilenamePath
usedEncoding:nil
error:nil];
NSLog(#"content=%#",content);
//Need to now remove the '.mov' file type identifier
NSString *shortContent= [content substringToIndex:[content length]-4];
NSLog(#"***************shortContent***************%#", shortContent);
NSURL *convertedContent = [NSURL fileURLWithPath:shortContent];
NSLog(#"***************convertedContent***********%#",convertedContent);
NSData *videoData = [NSData dataWithContentsOfFile:convertedContent ofType:#"mov"];];
There is no NSData method called dataWithContentsOfFile:ofType:
The methods available are:
+ dataWithContentsOfFile:
+ dataWithContentsOfFile:options:error:
both of which take the file location as an NSString so there's not need to convert to an NSURL