I'm doing an application using NSXmlParser. I'm getting data from server.I have to display details of the item including item image also.
I'm getting image data from parser, which is not adding to imageView .I'm using code as
UIImageView *warrantyCardImage;
warantyCardImage.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:warObj1.warrantyCardImagePath]]];
When I'm printing in console I'm getting value .By giving code as
printf("\n%s:",[warObj1.warrantyCardImagePath UTF8String]) and getting output as
http://123.237.186.221:8080/Warrantify/Barcode/barcodefbbab1dd-9ff0-448b-8d46-dcebf5d11b37.png
If I'm giving code as
UIImageView *warrantyCardImage;
warantyCardImage.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://123.237.186.221:8080/Warrantify/Barcode/barcodefbbab1dd-9ff0-448b-8d46-dcebf5d11b37.png"]]];
it is working ,the image is adding to imageView
Guy's hope that I will get a quick response from your side.
Thanks to all,
Sri Lakshmi.
Verify that your data object is really being formed correctly. You are assuming it is in your sample.
UIImageView *warrantyCardImage;
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://123.237.186.221:8080/Warrantify/Barcode/barcodefbbab1dd-9ff0-448b-8d46-dcebf5d11b37.png"]];
if(imageData)
{
warantyCardImage.image=[UIImage imageWithData:imageData];
}
else
{
NSLog(#"sadness");
}
You are using a synchronous download method which maybe isnt the best. Explore the docs around NSURLDownload http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/URLLoadingSystem/Tasks/UsingNSURLDownload.html which might serve you better.
Related
Does anyone has any idea how can I capture screen using objective c in mac os?
to be more specific, how can I capture the active / focused application screen then create an image into a specified path.
Any help is highly appreciated.
#Daniel,
You don't need to understand and implement the whole "Son of Grab". You just need the code below.
The following function will give you the screenshot
// This just invokes the API as you would if you wanted to grab a screen shot. The equivalent using the UI would be to
// enable all windows, turn off "Fit Image Tightly", and then select all windows in the list.
CGImageRef screenShot = CGWindowListCreateImage(CGRectInfinite, kCGWindowListOptionOnScreenOnly, kCGNullWindowID, kCGWindowImageDefault);
Use the following code to convert it to a NSImage
NSBitmapImageRep *bitmapRep = [[NSBitmapImageRep alloc] initWithCGImage:screenShot];
// Create an NSImage and add the bitmap rep to it...
NSImage *image = [[NSImage alloc] init];
[image addRepresentation:bitmapRep];
[bitmapRep release];
bitmapRep = nil;
Have you checked out Apple's “Son of Grab” for capturing images of windows with the CGWindow api?
You can also check Apple's OpenGLScreenSnapshot
I need to load image from server(url) to UITableView. So i tired below code, but no use.
UIImageView *img=[[UIImageView alloc]init];
img.frame=fr;
img.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:countimg]]];
[cell.contentView addSubview:img];
Here countimg is NSMutableArray. countimg contains url of all images to load. But its not working, because its not a string variable. I don't know how to change NSMutuableArray to String.
Anyone help me.
You can get string urls from countimg array like this,
[countimg objectAtIndex:index];
Where index is an integer of range between >=0 && < [countimg count]
Now if you're using countimg array in UITableView delegate then, you've replace index variable with indexPath.row.
So for now your code would look like this,
UIImageView *img=[[UIImageView alloc]init];
img.frame=fr;
img.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[countimg objectAtIndex:indexPath.row]]]]; //note this
[cell.contentView addSubview:img];
Update:
As #DavidAtkinson, suggestion, you should not use dataWithContentsOfURL method to load a NSURL to download a image. As its perform in main thread and will stuck the UI until download would not completes. Its better to load image in background.
Also, there's some asynchronous UIImageView's available, one which I am using is SDWebImage.
Use SDWebImage to load your image from server. here using this library you can put placeholder image in tableview cell's image view till the image loaded. You can even cache your image by just doing a single line code
[UIImageView setImageWithUrl:[pass your URL here] placeholderImage:[pass name of placeholder image] options:SDWebImageRefreshCached]
If you are trying to load your images from URL into a tableview,the SDWebImage code from Github does not specify how to do that.You have to create an object at index,then load the object for key name from the file you are parsing from.This will require you to change the SDWebImage code so that instead of parsing directly from a specific url,its parsing from
an object key name that contains an image url from your json or xml file.
Here is a sample code for loading an image from an object key in a json:
NSURL* url = [NSURL URLWithString:[dictionaryObject valueForKey:#"yourfile"]];
NSData *data = [NSData dataWithContentsOfURL:url];
dispatch_sync(dispatch_get_main_queue(), ^{
UIImageView *imgViewThumb=[[UIImageView alloc]initWithFrame:imgView.frame];
[imgViewThumb setImage:[UIImage imageWithData:data]];
[cell addSubview:imgViewThumb];
I've been stuck with adding a UIImage to my iPhone application, to add an image i usually used the name of the image and put it like that :
UIImage* myImage1 = [UIImage imageNamed:#"myImage.png"];
But in my application i don't know the name of the image when i'm writting the code, i've got the image name with a webservice and i put it in a NSString.
So i have a string m_image1, and i want to display the image in a UIImage like that :
UIImage* myImage1 = [UIImage imageNamed:m_image1];
But nothing appears on the screen, when i use NSLog to show if m_image1 has the right string it works, and when i paste what is print in the log in the imageNamed it works.
I've already tried using the path of my application, but nothing do it ! So i don't know what to try anymore !
That's my all block of code :
NSLog(#"m_image1 : %#",m_image1);
UIImage* myImage1 = [UIImage imageNamed:m_image1];
m_result1ImageView = [[UIImageView alloc] initWithImage:myImage1];
m_result1ImageView.frame = CGRectMake(0.f, 0.f, 163.f, 260.f);
[m_ScrollImages addSubview:m_result1ImageView];
Everything work just fine, when i put :
UIImage* myImage1 = [UIImage imageNamed:#"myImage.png"];
instead of :
UIImage* myImage1 = [UIImage imageNamed:m_image1];
it display the image !
I think your image is not in the resources!
Check your image: Go to the Project Navigator and click on blue icon which is your project. Now in Targets click on your target and go to Build phases tab and check Copy bundle resources.
Your image file must be in the list, if it is not add it and check the program again!
I hope it be useful for you!
try this code ,
m_result1ImageView.image=[UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString: m_image1]]];
I think you have not copied exactly the images in your application bundle that is being not displayed .
Try & check removing bunch of images and add those again in your project.
Currently, I'm working on the client for the website. I have tonne of images that I need to load to my TableView. Here is what I'm currectly doing:
NSDictionary *propertyItems = [self.items objectAtIndex:indexPath.row];
cell.fio.font = [UIFont boldSystemFontOfSize:17.0f];
if([propertyItems objectForKey:#"online"] == [NSNumber numberWithInt:1])
cell.fio.textColor = [UIColor colorWithRed:0.3 green:0.6 blue:0.3 alpha:1.0];
dispatch_queue_t downloadPhotosQueue = dispatch_queue_create("downloadPhotosQeue", NULL);
dispatch_async(downloadPhotosQueue, ^{
NSData *photosData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:#"http://www.example.com/%#", [propertyItems objectForKey:#"photo_trumb"]]]];
dispatch_async(dispatch_get_main_queue(), ^{
cell.pic.image = [UIImage imageWithData:photosData];
});
});
cell.fio.text = [propertyItems objectForKey:#"fio"];
I'm doing this in cellForRowAtIndexPath: method.
Everything is loading fast. But the problem is, when I'm scrolling my table down, and after again up, the images are reloading over and over again.
Question: Is there any way to easily cache my UIImages that I'm getting from the server? So if they are loaded once, they wouldn't reload over and over again, while I'm running the app. Maybe I'm doing something wrong?
Thanks in advance!
I strongly recommend AsyncImageView. I use it and it works like a charm. Just set the image url and it handles everything itself.
AsyncImageView *imageView = [[AsyncImageView alloc]init];
imageView.imageURL = [NSURL URLWithString:#"https://www.google.es/logos/classicplus.png"];
It caches the image in memory so it won't retrieve it from the server again. It will also release them when receiving a memory warning.
To load image from a website I use AFNetworking. It provides a class to load an image from an URL:
Start by adding #import "UIImageView+AFNetworking" to the top of a
controller or a view implementation file. This category adds methods
to UIImageView, like:
[imageView setImageWithURL:[NSURL URLWithString:#"…"]];
i recommend this library to accomplish what you want.
in cellForRowAtIndexPath:
[cell.imageView setImageWithURL:
[NSURL URLWithString:[NSString stringWithString:#"www.yourimagepath.path"]]
placeholderImage:[UIImage imageNamed:#"no_image.jpg"]];
the library will cache the image for you. you can also set the setHolder of the image, so it wont look like a blank image while the images are downloading.
The problem is here :
NSData *photosData = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:#"http://www.example.com/%#", [propertyItems objectForKey:#"photo_trumb"]]]];
dataWithContentsOfURL
It launch a request to the Url everytime the function is called (everytime you scrolled).
You need to load all the picture before cellForRowAtIndexPath.
Like in ViewDidLoad.
You can just store them in an array and display your picture's array in cellForRowAtIndexPath.
If it's really fast to load like you say : jsut load picture Once in CellForRowAtIndexPath. Store them in a mutableArray. And check if the picture already exist .
is it possible to convert the HTML page to image in cocoa?
Actually i have created the complete view in the HTML and now i want to convert the whole html preview to the image (any jpeg or png etc.).
I couldn't find any resource or sample on the web, which provides some sort of help on my above queries.It's highly appreciated if someone could share his wisdom on how I can achieve this.
Thanks in advance..
First off, I'd like to thank sergio... his answer got me started but I thought I'd share some of the code that I didn't find obvious that I had to write to make it work:
Here's how to make a thumbnail for a page without ever having it displayed:
// Your width and height can be whatever you like, but if you want this to render
// off screen, you need an x and y bigger than the superview's width and height
UIWebView* webView = [[UIWebView alloc] initWithFrame:CGRectMake(largerScreenDimension, largerScreenDimension, largerScreenDimension, largerScreenDimension)];
[self.view addSubview:webView]; // UIWebViews without an assigned superview don't load ever.
webView.delegate = self; // or whoever you have implement UIWebViewDelegate
webView.scalesToFit = YES; // This zooms the page appropriately to fill the entire thumbnail.
[webView loadRequest:[NSURLRequest requestWithURL:url]];
Then implement this in your delegate:
- (void)webViewDidFinishLoad:(UIWebView *)webView {
UIGraphicsBeginImageContext(webView.bounds.size);
[webView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *webViewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *thumbnailData = UIImagePNGRepresentation(webViewImage);
[webView removeFromSuperview];
}
Finally, to display this thumbnail you'll need something like:
thumbnailImageView.image = [UIImage imageWithData:thumbnailData];
As a bonus thing I'll mention, I wanted multiple thumbnails to be generated at once. I found using objc_setAssociatedObject() and objc_getAssociatedObject() to be very helpful with keeping track of which webView was loading which thumbnail. Going into detail on how that worked is beyond the scope of this question, though.
You can draw your view in an image context, like this:
UIWebView* view = ...
....
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imagedata = UIImagePNGRepresentation(viewimage);
NSString *encodedString = [imageData base64Encoding];
Another option would be using Quartz PDF engine to create a PDF.