I have the following code:
-(void) viewDidAppear:(BOOL)animated {
AsyncImageView *weatherImageView = [[AsyncImageView alloc] initWithFrame:weatherImage.frame];
NSString *myString = #"http://openweathermap.org/img/w/10d.png";
NSString *url = [NSString stringWithString:myString];
NSLog(#"The complete url is %#", url);
[weatherImageView loadImageFromURL:url];
[self.weatherImage addSubview:weatherImageView];
}
The image URL is all fine but the image does not show up when the view appears.
But if I write the following line in the same method
-(void) viewDidAppear: (BOOL) animated {
[self.weatherImage setImage:[UIImage imageNamed:[UIImage imageNamed:"background.png"]]];
}
I see that the image referred by "background.png" appears neat in the ImageView.
Wondering what is wrong with the first code.
loadImageFromURL expects a NSURL. Not a NSString:
AsyncImageView *weatherImageView = [[AsyncImageView alloc] initWithFrame:weatherImage.frame];
NSString *myString = #"http://openweathermap.org/img/w/10d.png";
NSURL *url = [NSURL URLWithString:myString];
NSLog(#"The complete url is %#", url);
[weatherImageView loadImageFromURL:url];
Related
I have a requirement of streaming from server and displaying the streamed content on the screen...Streaming is working fine using NSStream, and NSInputStream and NSOutputStream.How can I display it on the screen?
Stream used looks like #"http://191.168.143.41:1212/;
if(stream == inputStream) {
uint8_t buf[1024];
unsigned int len = 0;
len = [inputStream read:buf maxLength:1024];
if(len > 0) {
NSMutableData* datas=[[NSMutableData alloc] initWithLength:0];
[datas appendBytes: (const void *)buf length:len];
NSString *s = [[NSString alloc] initWithData:datas encoding:NSASCIIStringEncoding];
[self readIn:s];
NSLog(#"ss%#",s);
[self loadMovie:s]; //method for movie player
}
I tried to display this is in a movieplayer as below..
-(void_loadMovie:(NSString*)moviePrefix
{
NSString *path = [NSString stringWithFormat:#"%#.mjpg", moviePrefix];
NSURL *url = [NSURL fileURLWithPath:path];
if (url) {
_moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];
_moviePlayer.view.frame = CGRectMake(0, 70, 600, 450);
_moviePlayer.controlStyle = MPMovieControlStyleNone;
_moviePlayer.scalingMode = MPMovieScalingModeNone;
[dic setObject:__moviePlayer forKey:path];
}
}
[_moviePlayer prepareToPlay];
[self.view addSubview: _moviePlayer.view];
[self.view bringSubviewToFront:_moviePlayer.view];
[self.view addSubview: _moviePlayer.view];
[_moviePlayer play];
}
Is NSString *path = [NSString stringWithFormat:#"%#.mjpg", moviePrefix]; correct way??
This displays a black screen.What is wrong?
If this way is not correct,Is there any other way I can display those frames?
Can anyone help me to solve this...
MJPEG are only JPEG sent one after the other.
I worked a few years ago on this.
On a version of iOS (iOS5?), it was easily read with a UIWebView, but an update of iOS broke all this. This broke all my current work.
Maybe a UIWebView could do the trick today again (fix).
Anyway, since it's just bunch of JPEG, you could just read the JPG (detect start/end of JPG file), create the JPG image and show it in a UIImageView.
A work around (not tested), but you should get the whole idea:
//Properties
#property (nonatomic, strong) NSMutableData *data;
#property (nonatomic, weak) IBOutlet UIImageView *streamImageView;
//Initialize somewhere
_data = [[NSMutableData alloc] init];
//In the stream delegate method:
//Start JPG: FFD8 — End JPG: FFD9
UInt8 startJPEGBytes[2];
startJPEGBytes[0] = 0xFF;
startJPEGBytes[1] = 0xD8;
NSData *startData = [NSData dataWithBytes:&startJPEGBytes length:2];
UInt8 endJPEGBytes[2];
endJPEGBytes[0] = 0xFF;
endJPEGBytes[0] = 0xD9;
NSData *endData = [NSData dataWithBytes:&endJPEGBytes length:2];
[_data appendBytes: (const void *)buf length:len];
NSRange startRange = [_data rangeOfData:startData options:0 range:NSMakeRange(0, [_data length])];
if (startRange.location != NSNotFound) //We found the start of a JPEG
{
NSRange endRange = [_data rangeOfData:endData options:0 range:NSMakeRange(startRange.location, [_data length]-startRange.location)];
if (endRange.location != NSNotFound) //We found the end of a JPEG
{
NSRange imageRange = NSMakeRange(startRange.location, endRange.location+endRange.length-startRange.location);
NSData *imageData = [_data subDataWithRange: imageRange];
streamImage = [UIImage imageWithData:imageData];
[_streamImageView setImage:streamImage];
[_data replaceBytesInRange:NSMakeRange(0, imageRange.location+imageRange.length withBytes:NULL length:0]; //We remove the start till the end of JPEG frame. Start at 0, since there could be garbage at the start.
}
}
You are not adding moviePrefix to the string
NSString *path = [NSString stringWithFormat:#".mjpg", moviePrefix, #"movie"];
Change it to
NSString *path = [NSString stringWithFormat:#"%#.mjpg", moviePrefix, #"movie"];
https://github.com/horsson/mjpeg-iphone/tree/55251a85e2c2489014036ddf5a491783f9b1962d
Used this to get the stream and display.It works
I am displaying cinema gossips in UITableview then select the cell its displays Detailviewcontroller . Successfully Get the data in UITableview, In DetailviewController UIImageview and UITextview, Get the Description Successfully but Images not displayed. This is my code please check once's
This is URL NSURL *url = [NSURL URLWithString:#"http://www.cinejosh.com/rss-feed/3/andhra-latest-gossips-news.html"];
This is my code. IS any problem in my code. please check once's
- (void)loadingImageUrl
{
NSData *gossipsHtmlData = [NSData dataWithContentsOfURL:gossipsUrl];
TFHpple *gossipsParser = [TFHpple hppleWithHTMLData:gossipsHtmlData];
NSString *gossipsXpathQueryString = #"//td//img";
imageGossipsNodes = [gossipsParser searchWithXPathQuery:gossipsXpathQueryString];
for (TFHppleElement *element in imageGossipsNodes) {
NSString *imageUrlString = [NSString stringWithFormat:#"http://www.cinejosh.com%#", [element objectForKey:#"src"]];
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrlString]];
imageview.image = [UIImage imageWithData:imageData];
}
}
Its doesn't call for loop.
Inside of uiwebview, what is a good way print a pdf document?
The pdf is accessible via a url or it can be loaded inside of an iframe.
Using the standard javascript widnow.print() functions will not work.
I am considering using a javascript bridge such as:
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSURL *URL = [request URL];
if ([[URL scheme] isEqualToString:#"native"]) {
NSString *urlString = [[request URL] absoluteString];
NSArray *urlParts = [urlString componentsSeparatedByString:#":"];
NSString *cmd = [urlParts objectAtIndex:1];
if ( [cmd isEqualToString:#"printPdf"] ) {
// [self dosomething];
}
}
return YES;
}
At this point I need some sort of xcode function which accept a path to the pdf and send it the airPrinter.
Is this a good approach? I am searching examples of how to print a pdf inside a uiWebView.
As I've earned the tumbleweed badge for no up votes and no responses, I'll post my solution.
This fetches the pdf doc and opens the airPrint dialog--all within a uiWebView.
So if IOS would simply allow the javascript window.print() to function inside of uiWebView, my app would not be setting in the app store waiting for approval and re-release.
Anyway, here's a working solution:
- (void)printInit:(NSString *)parm {
UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
if(!controller){
NSLog(#"Couldn't get shared UIPrintInteractionController!");
return;
}
NSString *base = #"https://someurl.com/";
NSString *ustr = [base stringByAppendingString:parm];
//NSURL *url = [NSURL fileURLWithPath:ustr];
NSURL *url = [NSURL URLWithString:ustr];
NSData *thePdf = [NSData dataWithContentsOfURL:url];
controller.printingItem = thePdf;
UIPrintInfo *printInfo = [UIPrintInfo printInfo];
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = #"PDFDoc";
controller.printInfo = printInfo;
void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
if (!completed && error) {
NSLog(#"FAILED! error = %#",[error localizedDescription]);
}
};
CGRect rect = CGRectMake(310, 5, 100, 5);
[controller presentFromRect:rect inView:self.webView animated:YES completionHandler:completionHandler];
}
I'm very new to programming, and I jumped right into a project (I know thats not the smartest thing to do, but I'm learning as I go). The app that I'm writing has 10 UIImageViews that display a picture from the users camera roll. The code I'm using needs each of the UIImageViews to have tags. I'm currently using NSData to save the array images, and it works great, but I can't use this method anymore because NSData doesn't support the use of tags. I also can't use NSUserDefaults, because I can't save images to a plist. Here is how I'm attempting to do this (using the NSData method, which works but I have to edit this so that my tags work.)
This is my current code:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img editingInfo:(NSDictionary *)editInfo {
if (imageView.image == nil) {
imageView.image = img;
[self.array addObject:imageView.image];
[picker dismissModalViewControllerAnimated:YES];
[self.popover dismissPopoverAnimated:YES];
return;
}
if (imageView2.image == nil) {
imageView2.image = img;
NSLog(#"The image is a %#", imageView);
[self.array addObject:imageView2.image];
[picker dismissModalViewControllerAnimated:YES];
[self.popover dismissPopoverAnimated:YES];
return;
}
...
- (void)applicationDidEnterBackground:(UIApplication*)application {
NSLog(#"Image on didenterbackground: %#", imageView);
[self.array addObject:imageView.image];
[self.array addObject:imageView2.image];
[self.user setObject:self.array forKey:#"images"];
[user synchronize];
}
- (void)viewDidLoad
{
self.user = [NSUserDefaults standardUserDefaults];
NSLog(#"It is %#", self.user);
self.array = [[self.user objectForKey:#"images"]mutableCopy];
imageView.image = [[self.array objectAtIndex:0] copy];
imageView2.image = [[self.array objectAtIndex:1] copy];
UIApplication *app = [UIApplication sharedApplication];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(applicationDidEnterBackground:)
name:UIApplicationDidEnterBackgroundNotification
object:app];
[super viewDidLoad];
}
Any help or suggestions on how to edit this code so that I can save the images, while using tags is much appreciated, thanks!
EDIT: Here is my updated code:
-(IBAction)saveButtonPressed:(id)sender {
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES) objectAtIndex:0];
for (UIImageView *imageView in self.array) {
NSInteger tag = self.imageView.tag;
UIImage *image = self.imageView.image;
NSString *imageName = [NSString stringWithFormat:#"Image%i.png",tag];
NSString *imagePath = [docsDir stringByAppendingPathComponent:imageName];
[UIImagePNGRepresentation(image) writeToFile:imagePath atomically:YES];
}
NSLog(#"Saved Button Pressed");
}
- (void)applicationDidEnterBackground:(UIApplication*)application {
}
-(void)viewDidLoad {
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0];
NSArray *docFiles = [[NSFileManager defaultManager]contentsOfDirectoryAtPath:docsDir error:NULL];
for (NSString *fileName in docFiles) {
if ([fileName hasSuffix:#".png"]) {
NSString *fullPath = [docsDir stringByAppendingPathComponent:fileName];
UIImage *loadedImage = [UIImage imageWithContentsOfFile:fullPath];
if (!imageView.image) {
imageView.image = loadedImage;
} else {
imageView2.image = loadedImage;
}
}
}
}
You need to use "Fast Enumeration" to parse the array's objects, and write each object to disk sequentially. First, you're going to need to add the UIImageView objects to the array instead of the UIImage property of the UIImageView, so you can recover the tag. So instead of writing
[self.array addObject:imageView.image];
It will be
[self.array addObject:imageView];
Try to follow along with my code. I inserted comments on each line to help.
-(void)applicationDidEnterBackground:(UIApplication *)application {
//Obtain the documents directory
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainmask,YES) objectAtIndex:0];
//begin fast enumeration
//this is special to ObjC: it will iterate over any array one object at a time
//it's easier than using for (i=0;i<array.count;i++)
for (UIImageView *imageView in self.array) {
//get the imageView's tag to append to the filename
NSInteger tag = imageView.tag;
//get the image from the imageView;
UIImage *image = imageView.image;
//create a filename, in this case "ImageTAGNUM.png"
NSString *imageName = [NSString stringWithFormat:#"Image%i.png",tag];
//concatenate the docsDirectory and the filename
NSString *imagePath = [docsDir stringByAppendingPathComponent:imageName];
[UIImagePNGRepresentation(image) writeToFile:imagePath atomically:YES];
}
}
To load the images from disk, you'll have to look at your viewDidLoad method
-(void)viewDidLoad {
//get the contents of the docs directory
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainmask,YES) objectAtIndex:0];
//Get the list of files from the file manager
NSArray *docFiles = [[NSFileManager defaultManager]contentsOfDirectoryAtPath:docsDir error:NULL]);
//use fast enumeration to iterate the list of files searching for .png extensions and load those
for (NSString *fileName in docFiles) {
//check to see if the file is a .png file
if ([fileName hasSuffix:#".png"]) {
NSString *fullPath = [docsDir stringByAppendingPathComponent:fileName];
UIImage *loadedImage = [UIImage imageWithContentsOfFile:fullPath];
//you'll have to sort out how to put these images in their proper place
if (!imageView1.image) {
imageView1.image = loadedImage;
} else {
imageView2.image = loadedImage;
}
}
}
}
Hope this helps
One thing you need to be aware of is that when an app enters the background it has about 5 seconds to clean up its act before it's suspended. The UIPNGRepresentation() function takes a significant amount of time and is not instantaneous. You should be aware of this. It would probably be better to write some of this code in other places and do it earlier than at app backgrounding. FWIW
You can use the [NSbundle Mainbundel] to store that images.
To get path
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
First, there's still a problem in your for loop.
for (UIImageView *imageView in self.array) {
NSInteger tag = self.imageView.tag;
UIImage *image = self.imageView.image;
// ...
}
Before you make any other changes, you must understand why. imageView is your for loop control variable, which changes on each iteration through the loop. self.imageView is a different thing. It is the first of the 10 imageViews attached to your viewController. Every time this loop cycles, it looks at the first imageView, and only the first.
As for why saving doesn't work, it's probably because the arrays elsewhere aren't working. Add some logging to make sure there's something in the array, and that it has as many elements as you expect.
-(IBAction)saveButtonPressed:(id)sender {
NSString *docsDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES) objectAtIndex:0];
// Log to make sure the views expected have previously been stored.
// If the array is empty, or shorter than expected, the problem is elsewhere.
NSLog(#"Image view array before saving = %#", self.array);
for (UIImageView *imageViewToSave in self.array) {
NSInteger tag = imageViewToSave.tag;
UIImage *image = imageViewToSave.image;
NSString *imageName = [NSString stringWithFormat:#"Image%i.png",tag];
NSString *imagePath = [docsDir stringByAppendingPathComponent:imageName];
// Log the image and path being saved. If either of these are nil, nothing will be written.
NSLog(#"Saving %# to %#", image, imagePath);
[UIImagePNGRepresentation(image) writeToFile:imagePath atomically:NO];
}
NSLog(#"Save Button Pressed");
}
I have been working on my application for a while now. I am stuck on this small problem: setting my text field's text isn't working.The string of the text field is called from another viewcontroller Here is what my code looks like:
1st view controller
-(void)setURL:(NSURL *)src
{
downloadSourceField.text = src;
}
2nd view controller
if ([[booksArray objectAtIndex:indexPath.row] isEqual:[NSString stringWithFormat:#"%#",song_1]])
{
NSString *sc1 = [NSString stringWithFormat:#"tst 1"];
[tc setURL:sc1];
}
else
{
NSString *sc = [NSString stringWithFormat:#"test 2"];
[tc setURL:sc];
}
I think you're trying to assign an NSURL object to an NSString variable. What you should do is
downloadSourceField.text = [src absoluteString];
The absoluteString method will convert your NSURL into an NSString representation.