I am new to web services and I have searched it but I couldn't find any documents about it. Is there any way to download images and videos from WCF Service and save the my app's document files? or do I need to use different way for download?
Thanks for your advice and interest.
Try using AFNetWorking: https://github.com/AFNetworking/AFNetworking
This is a sample how I download files from a WCF:
NSMutableURLRequest *reqeust = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:{url}]];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:reqeust];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:{path_on_disk} append:NO];
[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead) {
//Download progress
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
//Download failed
}];
[operation start]
Related
I have trying to download the multiple .mp3 files from a server at time. One complete audio file is divided into 286 parts. I fetch all the urls of the file and now I want to download 286 files. I search a lot but many library stop downloading when I go back to previous controller and if user minimize the app the downloaded stop. Is there any library which can manage multiple downloads and download didn't stop when user go back to previous controller of minimize the app.
I am using Download Manager library but I can't get my desired. Please give me the solution. I am stuck with that from 3 days . Please tell me the solution . Thanks
In my project I'm using AFNetwirking. You can create a singleton object, and here is my method (for example) for downloading files :
- (AFHTTPRequestOperation *)performDownloadWithURLString:(nonnull NSString *)urlString
destinationPath:(NSString *)destinationPath
progress:(void (^)(long long bytesRead, long long totalBytesToRead))progress
apiCallback:(void(^)(BOOL isSuccessful, id object))apiCallback
{
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
NSString *fullPath = [[FCFileManager pathForTemporaryDirectory] stringByAppendingPathComponent:[url lastPathComponent]];
[operation setOutputStream:[NSOutputStream outputStreamToFileAtPath:fullPath append:NO]];
[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead)
{
if(progress) {
progress(totalBytesRead, totalBytesExpectedToRead);
}
}];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if(destinationPath && [FCFileManager isFileItemAtPath:destinationPath]) {
NSError *removeError;
[FCFileManager removeItemAtPath:destinationPath error:&removeError];
}
if(destinationPath) {
[FCFileManager moveItemAtPath:fullPath toPath:destinationPath];
}
dispatch_async(dispatch_get_main_queue(), ^{
if(apiCallback) {
apiCallback(YES, destinationPath ?: fullPath);
}
});
});
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSError *removeError;
[FCFileManager removeItemAtPath:fullPath error:&removeError];
if(apiCallback) {
apiCallback(NO, [AZError errorWithNSError:error]);
}
}];
[operation start];
}
Hope it helps you.
I would like to download a folder which consists several kind of files(png,jpg,mov,txt and pdf). I am using AFNetworking. I have used below code for downloading,
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[Utilities urlencode:imageURL]]];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:str_path append:NO];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
{
//NSLog(#"Successfully downloaded file to %#", str_path);
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
NSLog(#"Error: %# =====%# =======%#", error.localizedDescription,str_path,imageURL);
}];
[operation setDownloadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToRead)
{
float progress = totalBytesWritten / (float)totalBytesExpectedToRead;
NSLog(#"Download Percentage: %f %%", progress*100);
}];
[operation start];
The above code works fine for individual files. But i have got error code of 21 while downloading folder. Any help would be greatly appreciated.
HTTP does not support downloading multiple files in one request. This is pretty much the same question asked here in reverse.
If you have FTP access you can use the CFFTP API to download the contents of a directory.
I want to know is there way to download images with my code one by one ? Now async
NSString *urlString = link;
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
AFHTTPRequestOperation *requestOperation = [[AFHTTPRequestOperation alloc] initWithRequest:urlRequest];
requestOperation.responseSerializer = [AFImageResponseSerializer serializer];
[requestOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
completion(operation, responseObject, nil);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
[RequestAPI sharedInstance].downloadsCount -= 1;
DDLogError(#"FAIL download image: %#",error);
}];
[requestOperation start];
Try this solution
Create a NSObject class for downloading the images. Lets call this DownloadImages. The class has an array of images to be downloaded arrayOfImagesURL.
Create a delegate for the class DownloadImages to make a call back when you finish downloading an image. View how to this in detail here.
Implement AFNetworking as you like, you can also accomplish this by using the iOS 7 API NSURLSession. So in the completion block of your download task, you need to do 2 things:
Continue downloading the next URL in arrayOfImagesURL.
Do a call back with the delegate to the parent controller for processing.
Tell me if there's something need to be more clarify.
I'm trying to figure out a way to download multiple images with AFNewtorking 2.0. I've read a lot of posts here in SO, but can't find the answer I'm looking for, hope you guys can help me.
The problem is that I want to know when all of the downloads finished and if all images where downloaded.
So I have an array with image URL's ant trying to do something like this.
for(NSString *photoUrlString in self.photos){
NSURL *url = [NSURL URLWithString:photoUrlString];
AFHTTPRequestOperation *requestOperation = [[AFHTTPRequestOperation alloc] initWithRequest:[NSURLRequest requestWithURL:url]];
requestOperation.responseSerializer = [AFImageResponseSerializer serializer];
[requestOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Image error: %#", error);
}];
[requestOperation start];
}
I've found some answers with putting these requests into a queue and setting max concurrent operations to 1. But don't know how that works really.
Any help is appreciated, thanks in advance!
for(Photo *photo in array){
//form the path where you want to save your downloaded image to
NSString *constPath = [photo imageFullPath];
//url of your photo
NSURL *url = [NSURL URLWithString:photo.serverPath];
AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:[NSURLRequest requestWithURL:url]];
op.responseSerializer = [AFImageResponseSerializer serializer];
op.outputStream = [NSOutputStream outputStreamToFileAtPath:constPath append:NO];
op.queuePriority = NSOperationQueuePriorityLow;
[op setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead){
}];
op.completionBlock = ^{
//do whatever you want with the downloaded photo, it is stored in the path you create in constPath
};
[requestArray addObject:op];
}
NSArray *batches = [AFURLConnectionOperation batchOfRequestOperations:requestArray progressBlock:^(NSUInteger numberOfFinishedOperations, NSUInteger totalNumberOfOperations) {
} completionBlock:^(NSArray *operations) {
//after all operations are completed this block is called
if (successBlock)
successBlock();
}];
[[NSOperationQueue mainQueue] addOperations:batches waitUntilFinished:NO];
Try this:
// _group, _queue are iVar variable
dispatch_group_t *_group = dispatch_group_create();
dispatch_queue_t *_queue = dispatch_queue_create("com.company.myqueue2", NULL);
// all files download
for(int i = 0 ; i < numberOfFileDownloads; i++){
dispatch_group_async(_group, _queue, ^{
// here is background thread;
// download file
});
}
// all files are download successfully, this method is called
dispatch_group_notify(_group, _queue, ^{
}
Check out +[AFURLConnectionOperation batchOfRequestOperations:progressBlock:completionBlock:]
Although it's not documented, implementation is self-explanatory. Also it allows you to monitor the progress.
You will need to have an array of HTTP operations prior to using this method (this is if you decided to stick to NSURLConnection-based implementation of AFNetworking).
I am developing an iOS application in which I have to download large data like images and videos locally on device. The data can be in GB's and there can be thousands of files to download. So, whats the best way to tackle this situation. Because it can have many failures like request time out etc.
Also I have to updated core data that if the file has been successfully downloaded or not.
Any best and simple way would be appreciated.
Try taking a look at AFNetworking framework, handles almost everything for you and probably faster then you could implement.
Also do the downloading on a background thread using GCD. I've had decent results downloading 50Mb files.
You can use AFNetworking for that. it is a best API for dealing with web services now a days .you can download Latest AFNetworking API for iOS from github and.
you can use
- (void)uploadImageAtUrl:(NSURL*)url
{
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];
NSData *imageData = UIImageJPEGRepresentation([UIImage imageNamed:#"yourImg.jpg"], 0.5);
NSMutableURLRequest *request = [httpClient multipartFormRequestWithMethod:#"POST" path:#"" parameters:nil constructingBodyWithBlock: ^(id <AFMultipartFormData>formData) {
[formData appendPartWithFileData:imageData name:#"yourImg" fileName:#"yourImg.jpg" mimeType:#"image/jpeg"];
}];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
//Check progress
NSLog(#"Sent %lld of %lld bytes", totalBytesWritten, totalBytesExpectedToWrite);
}];
[httpClient enqueueHTTPRequestOperation:operation];
}