Question

我使用alasset库成功获取了我的iphone图库中的所有图片网址并存储在一个数组中。现在我想上传到服务器，这是我的代码：

我尝试了两种方法，但是在迭代了大约10张图像后，两种方法都崩溃了，没有任何崩溃日志。图片无法上传到服务器，在上传前会崩溃。

1

NSData *imgData; UIImage *img; NSInputStream *stream;

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://my.url.com"]];

for(int i=0; i<_dataContainer.count; i++)
{
    img = [UIImage imageWithCGImage:[[[_dataContainer objectAtIndex:i] defaultRepresentation]fullResolutionImage]];
    imgData = UIImageJPEGRepresentation(img, 1.0);
    stream = [[NSInputStream alloc] initWithData:imgData];
    [request setHTTPBodyStream:stream];
    [request setHTTPMethod:@"POST"];
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                               NSLog(@"Finished with status code: %i", [(NSHTTPURLResponse *)response statusCode]);
                           }];
}

2：使用Afnetworking

AFHTTPClient *client= [[AFHTTPClient alloc]initWithBaseURL:[NSURL URLWithString:@"http://my.url.com"]];
     NSURLRequest *myRequest;
    __block UIImage *img;
    __block NSData *imgData;
    __block NSString *fName;


    myRequest = [client multipartFormRequestWithMethod:@"POST" path:@"/images/mypage.php" parameters:nil constructingBodyWithBlock:
                 ^(id <AFMultipartFormData>formData)
                 {                     
                     img = [UIImage imageWithCGImage:[[[_dataContainer objectAtIndex:0] defaultRepresentation]fullResolutionImage]];
                     imgData = UIImageJPEGRepresentation(img, 1.0);
                     fName = [self returnDateTimeWithMilliSeconds];

                     [formData appendPartWithFileData:imgData name:@"photo" fileName:[NSString stringWithFormat:@"%@.jpg",fName] mimeType:@"image/jpeg"];

                     NSLog(@"FN=>%@ | Size=>%@",fName, [NSByteCountFormatter stringFromByteCount:[imgData length] countStyle:NSByteCountFormatterCountStyleFile]);
                 }];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:myRequest];
    [operation start];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
     {

         NSLog(@"Success Data -> %@", operation.responseString);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"Failed");
     }];

    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        NSLog(@"Progrees -> %f", ((float)((int)totalBytesWritten) / (float)((int)totalBytesExpectedToWrite)));
    }];

Answer 1

@interface MyHTTPClient : AFHTTPClient

+ (id)sharedClient;

@end

@implementation MyHTTPClient

+ (id)sharedClient
{
    static MyHTTPClient *sharedClient;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedClient = [[MyHTTPClient alloc] initWithBaseURL:nil];
    });
    return sharedClient;
}

@end

@implementation MyViewController

- (void)uploadImages
{
    NSURLRequest *myRequest;
    __block UIImage *img;
    __block NSData *imgData;
    __block NSString *fName;


    myRequest = [client multipartFormRequestWithMethod:@"POST" path:@"/images/mypage.php" parameters:nil constructingBodyWithBlock:
                 ^(id <AFMultipartFormData>formData)
                 {                     
                     img = [UIImage imageWithCGImage:[[[_dataContainer objectAtIndex:0] defaultRepresentation]fullResolutionImage]];
                     imgData = UIImageJPEGRepresentation(img, 1.0);
                     fName = [self returnDateTimeWithMilliSeconds];

                     [formData appendPartWithFileData:imgData name:@"photo" fileName:[NSString stringWithFormat:@"%@.jpg",fName] mimeType:@"image/jpeg"];

                     NSLog(@"FN=>%@ | Size=>%@",fName, [NSByteCountFormatter stringFromByteCount:[imgData length] countStyle:NSByteCountFormatterCountStyleFile]);
                 }];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:myRequest];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)
     {

         NSLog(@"Success Data -> %@", operation.responseString);
     } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"Failed");
     }];

    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        NSLog(@"Progrees -> %f", ((float)((int)totalBytesWritten) / (float)((int)totalBytesExpectedToWrite)));
    }];

    [[MyHTTPClient sharedClient] enqueueHTTPRequestOperation:operation]
}

@end

Answer 2

设置完成和进度块回调后，您应[operation start];。

Answer 3

您的崩溃可能是由于内存过载造成的。首先，在第1部分中，您需要在每次迭代时排空自动释放池，如下所示：

NSData *imgData; UIImage *img; NSInputStream *stream;

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://my.url.com"]];

    for(int i=0; i<_dataContainer.count; i++)
    {
        @autoreleasepool {
            img = [UIImage imageWithCGImage:[[[_dataContainer objectAtIndex:i] defaultRepresentation]fullResolutionImage]];
            imgData = UIImageJPEGRepresentation(img, 1.0);
            stream = [[NSInputStream alloc] initWithData:imgData];
            [request setHTTPBodyStream:stream];
            [request setHTTPMethod:@"POST"];
            [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]
                                   completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                                       NSLog(@"Finished with status code: %i", [(NSHTTPURLResponse *)response statusCode]);
                                   }];
        }
    }

imageWithCGImage:和UIImageJPEGRepresentation等方法返回大型自动释放对象，因此您需要确保尽快释放它们以释放内存。

在第2部分：

关于AFNetworking，调用[operation start]是没用的。该操作将在超出范围时立即释放，因此不太可能实际完成。您需要保留AFHTTPClient实例（通常以单例形式完成，但属性足够好）并通过调用对其进行排队操作：

[httpClient enqueueHTTPRequestOperation:operation]

需要帮助从ios设备上传多个大图像

3 个答案: