Amazon S3的iPhone SDK的下载图像

Question

我不能，我的生活，找出如何实现我的iOS项目Amazon的SDK，我似乎无法找到什么，我试图做多文档...希望你能帮助！

我想，很干脆，从我的亚马逊S3帐户下载文件，并将它们存储在本地的iPhone ...我可以通过HTTP地址访问的图像做，但这并不像保护图像我会比较喜欢。

从我读过，我应该做这样的事情：

AmazonS3Client *s3Client = [[AmazonS3Client alloc] initWithAccessKey:@"mykey" withSecretKey:@"mysecretkey"]; 

     S3GetObjectRequest *requestedObject = [[S3GetObjectRequest alloc] initWithKey:bucketPath withBucket:@"mybucket"]; 

     NSLog(@"requestedobject:%@", requestedObject - I get the log here); 

     S3GetObjectResponse *getObjectResponse = [s3Client getObject:requestedObject]; 

     NSLog(@"requestedobject2:%@", getObjectResponse - it crashes before this happens); 
     NSData *myData2; 
     myData2 = getObjectResponse.body; 
     [myData2 writeToFile:bucketPath atomically:YES]; 

我清楚地做错事与getObjectResponse，则GetObject代码，但我无法找出正确的语法。 ..任何帮助将不胜感激！

这里是日志： 2012-08-02 17：12：33.856收集总版[13176：4e07] requestedobject： 2012-08-02 17：12：34.044收集总版[13176：4e07] *终止应用程序由于未捕获的异常“AmazonServiceException”，原因是：“（空）”

也许我还应该提到，我可以得到遗愿清单的内容与下面的代码

S3ListObjectsRequest *listObjectRequest = [[S3ListObjectsRequest alloc] initWithName:@"my bucket"]; 

     S3ListObjectsResponse *listObjectResponse = [s3Client listObjects:listObjectRequest]; 

     S3ListObjectsResult *listObjectsResults = listObjectResponse.listObjectsResult; 

     for (S3ObjectSummary *objectSummary in listObjectsResults.objectSummaries) { 

      NSLog(@"Bucket Contents:%@" ,[objectSummary key]); // This returns the contents of the bucket 

     } 

谢谢！ 扎克

Answer 1

从我看到这里，你可能有两个问题之一。首次开始使用AWS时，我遇到了类似的问题。首先确保您的存储桶名称全部是小写字母。您应该检查，看看为什么这是通过在@try puuting它的发生 - @catch块并记录错误，搞清楚当你的问题提供了非常详细。

-(UIImage *)getImageFromS3{  


    @try{ 
    AmazonS3Client *_s3Client = [[AmazonS3Client alloc]initWithAccessKey:ACCESS_KEY withSecretKey:SECRET_KEY];  

    S3GetObjectRequest *getObjectRequest = [[S3GetObjectRequest alloc]initWithKey:imageKey withBucket:pictureBucket]; 

    S3GetObjectResponse *response = [_s3Client getObject:getObjectRequest]; 

    if (response.error == nil) 
    { 
     if (response.body != nil) 
     { 
     UIImage *someImage = [UIImage imageWithData:reponse.body]; 
    return someImage; 
     } 
     else{ 
      NSLog(@"There was no value in the response body"); 
      return nil; 
      } 
    } 
    else if (response.error != nil) 
    { 
     NSLog(@"There was an error in the response while getting image: %@",response.error.description); 
    } 
} 

    @catch (NSException *exception) { 
    NSLog(@"There was an exception when connecting to s3: %@",exception.description); 
} 

} 

Answer 2

问题的可能是与您的密钥对相关的权限。我的建议是几乎所有的人去你的IAM on your Management Console，创造你想要的正确的S3权限的新组，在这种情况下，除了一些你并不需要更多的管理的东西（所以主要只是POST，GET权限） 。然后在该组内创建一个用户并使用该密钥对进行测试。这可能会把事情弄清楚，因为这是我认为为我工作的过程。看起来，列表权限是相当低的水平，但是，POST和GET需要不同的权限。

Answer 3

可能是它让，但可能会帮助一些之一。这里是上传图像女将-S3代码

constant.h 
#import <Foundation/Foundation.h> 
#define SECRET_KEY    @"your secret kry" 
#define ACCESS_KEY_ID   @"your access id" 

的#define PICTURE_BUCKET @ “斗名” 的#define PICTURE_NAME @ “任何词” 的#define CREDENTIALS_ERROR_TITLE @ “缺少凭据” 的#define CREDENTIALS_ERROR_MESSAGE @” AWS Credentials配置不正确，请查阅自述文件。“

@interface常数：NSObject的

+（的NSString *）pictureBucket;

@end

在constant.m

＃进口“常数。H”

@implementation常数 +（的NSString *）pictureBucket { 返回[[NSString的stringWithFormat：@ “％@ - @％”，PICTURE_BUCKET，ACCESS_KEY_ID] lowercaseString]; }

@end 

在UploadViewController.h

typedef enum { 
    GrandCentralDispatch, 
    Delegate, 
    BackgroundThread 
    } UploadType; 

    @interface UploadPhotoViewController : UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate,UINavigationControllerDelegate, AmazonServiceRequestDelegate> 
{ 
UploadType _uploadType; 
} 

@property (strong, nonatomic) IBOutlet UIButton *buttonSelectPhoto; 
    @property (nonatomic, retain) AmazonS3Client *s3; 

在UploadViewController.m

 #import "UploadPhotoViewController.h" 
     #import <AWSRuntime/AWSRuntime.h> 
     #import "Constant.h" 

     @interface UploadPhotoViewController() 

     @end 

     @implementation UploadPhotoViewController 

    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
     { 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
    // Custom initialization 
     } 
     return self; 
    } 

     - (void)viewDidLoad 
     { 
    [super viewDidLoad]; 
// Do any additional setup after loading the view from its nib. 

    #ifdef DEBUG 
    [AmazonLogger verboseLogging]; 
    #else 
     [AmazonLogger turnLoggingOff]; 
    #endif 

    [AmazonErrorHandler shouldNotThrowExceptions]; 

     if(![ACCESS_KEY_ID isEqualToString:@"CHANGE ME"] 
      && self.s3 == nil) 
     { 
    // Initial the S3 Client. 
    //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
    // This sample App is for demonstration purposes only. 
    // It is not secure to embed your credentials into source code. 
    // DO NOT EMBED YOUR CREDENTIALS IN PRODUCTION APPS. 
    // We offer two solutions for getting credentials to your mobile App. 
    // Please read the following article to learn about Token Vending Machine: 
    // * http://aws.amazon.com/articles/Mobile/4611615499399490 
    // Or consider using web identity federation: 
    // * http://aws.amazon.com/articles/Mobile/4617974389850313 
    //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
    self.s3 = [[AmazonS3Client alloc] initWithAccessKey:ACCESS_KEY_ID withSecretKey:SECRET_KEY] ; 
    self.s3.endpoint = [AmazonEndpoints s3Endpoint:US_WEST_2]; 

    // Create the picture bucket. 
    S3CreateBucketRequest *createBucketRequest = [[S3CreateBucketRequest alloc] initWithName:[Constant pictureBucket] andRegion:[S3Region USWest2]]; 
    S3CreateBucketResponse *createBucketResponse = [self.s3 createBucket:createBucketRequest]; 
    if(createBucketResponse.error != nil) 
    { 
     NSLog(@"Error: %@", createBucketResponse.error); 
    } 
} 

    } 
    -(void)viewDidAppear:(BOOL)animated 
{ 
[super viewDidAppear:animated]; 

if ([ACCESS_KEY_ID isEqualToString:@"CHANGE ME"]) 
{ 
    [self showAlertMessage:CREDENTIALS_ERROR_MESSAGE withTitle:CREDENTIALS_ERROR_TITLE]; 
} 

} - （无效）showAlertMessage：（的NSString *）消息withTitle：（的NSString *）标题 { UIAlertView中* alertView = [[UIAlertView中的alloc] initWithTitle：标题 消息：消息 代表：无 cancelButtonTitle： @“OK” otherButtonTitles：nil]; alertView.delegate = self; [alertView show]; } - （空）alertView：（UIAlertView中*）alertView clickedButtonAtIndex：（NSInteger的）buttonIndex {

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 
dispatch_async(queue, ^{ 

    // Set the content type so that the browser will treat the URL as an image. 
    S3ResponseHeaderOverrides *override = [[S3ResponseHeaderOverrides alloc] init]; 
    override.contentType = @"image/jpeg"; 

    // Request a pre-signed URL to picture that has been uplaoded. 
    S3GetPreSignedURLRequest *gpsur = [[S3GetPreSignedURLRequest alloc] init]; 
    gpsur.key      = PICTURE_NAME; 
    gpsur.bucket     = [Constant pictureBucket]; 
    gpsur.expires     = [NSDate dateWithTimeIntervalSinceNow:(NSTimeInterval) 3600]; // Added an hour's worth of seconds to the current time. 
    gpsur.responseHeaderOverrides = override; 

    // Get the URL 
    NSError *error = nil; 
    NSURL *url = [self.s3 getPreSignedURL:gpsur error:&error]; 

    if(url == nil) 
    { 
     if(error != nil) 
     { 
      dispatch_async(dispatch_get_main_queue(), ^{ 

       NSLog(@"Error: %@", error); 
       [self showAlertMessage:[error.userInfo objectForKey:@"message"] withTitle:@"Browser Error"]; 
      }); 
     } 
    } 
    else 
    { 
     /*dispatch_async(dispatch_get_main_queue(), ^{ 
      // Display the URL in Safari 
      [[UIApplication sharedApplication] openURL:url]; 

     });*/ 
    }NSLog(@"url is %@",url); 

}); 

} 

    - (void)didReceiveMemoryWarning 
    { 
[super didReceiveMemoryWarning]; 
// Dispose of any resources that can be recreated. 
    } 

    - (IBAction)buttonTakePhoto:(id)sender 
    { 
UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 

picker.delegate = self; 

picker.allowsEditing = YES; 

picker.sourceType = UIImagePickerControllerSourceTypeCamera; 



[self presentViewController:picker animated:YES completion:NULL]; 
    } 

    - (IBAction)buttonSelectPhoto:(id)sender 
    { 
[self showImagePicker:Delegate]; 
} 

    - (void)showImagePicker:(UploadType)uploadType 
{ 
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init] ; 
imagePicker.delegate = self; 

_uploadType = uploadType; 

[self presentViewController:imagePicker animated:YES completion:NULL]; 
    } 


    - (void)processDelegateUpload:(NSData *)imageData 
{ 
// Upload image data. Remember to set the content type. 
S3PutObjectRequest *por = [[S3PutObjectRequest alloc] initWithKey:PICTURE_NAME 
                  inBucket:[Constant pictureBucket]]; 
por.contentType = @"image/jpeg"; 
por.data = imageData; 
por.delegate = self; 

// Put the image data into the specified s3 bucket and object. 
[self.s3 putObject:por]; 
} 

    -(void)request:(AmazonServiceRequest *)request didCompleteWithResponse:(AmazonServiceResponse *)response 
    { 
[self showAlertMessage:@"The image was successfully uploaded." withTitle:@"Upload Completed"]; 

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; 
    } 

-(void)request:(AmazonServiceRequest *)request didFailWithError:(NSError *)error 
    { 
NSLog(@"Error: %@", error); 
[self showAlertMessage:error.description withTitle:@"Upload Error"]; 

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO]; 
    } 

    #pragma mark - UIImagePickerControllerDelegate methods 

     -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
    { 
// Get the selected image. 
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage]; 

// Convert the image to JPEG data. 
NSData *imageData = UIImageJPEGRepresentation(image, 1.0); 


if(_uploadType == Delegate) 
{ 
    [self processDelegateUpload:imageData]; 
} 

[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES]; 

[picker dismissViewControllerAnimated:YES completion:NULL]; 
    } 

    -(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
    { 
[picker dismissViewControllerAnimated:YES completion:NULL]; 
    } 

    - (IBAction)buttonBack:(id)sender 
    { 
[self.navigationController popViewControllerAnimated:YES]; 
    } 

    @end