我最终决定上传 Base64 图像,将其分割成更小的子字符串。为了做到这一点,并且因为我需要很多NSURLConnections
,我创建了一个名为TagConnection
它为每个连接提供一个标签,这样它们之间就不会出现混淆。
然后我创建了一个TagConnection
财产在MyViewController
目的是从任何函数访问它。正如你所看到的,有-startAsyncLoad:withTag:
分配和初始化的函数TagConnection
和-connection:didReceiveData:
当我收到服务器的响应时将其删除。
参考-uploadImage
函数首先将图像转换为字符串,然后将其分割并将块放入 JSON 请求中。它会被调用,直到变量偏移量大于字符串长度,这意味着所有块都已上传。
您还可以通过每次检查服务器响应并仅调用-uploadImage
返回成功时的函数。
我希望这是一个有用的答案。谢谢。
标签连接.h
@interface TagConnection : NSURLConnection {
NSString *tag;
}
@property (strong, nonatomic) NSString *tag;
- (id)initWithRequest:(NSURLRequest *)request delegate:(id)delegate startImmediately:(BOOL)startImmediately tag:(NSString*)tag;
@end
标签连接.m
#import "TagConnection.h"
@implementation TagConnection
@synthesize tag;
- (id)initWithRequest:(NSURLRequest *)request delegate:(id)delegate startImmediately:(BOOL)startImmediately tag:(NSString*)tag {
self = [super initWithRequest:request delegate:delegate startImmediately:startImmediately];
if (self) {
self.tag = tag;
}
return self;
}
- (void)dealloc {
[tag release];
[super dealloc];
}
@end
MyViewController.h
#import "TagConnection.h"
@interface MyViewController : UIViewController
@property (strong, nonatomic) TagConnection *conn;
MyViewController.m
#import "MyViewController.h"
@interface MyViewController ()
@end
@synthesize conn;
bool stopSending = NO;
int chunkNum = 1;
int offset = 0;
- (IBAction) uploadImageButton:(id)sender {
[self uploadImage];
}
- (void) startAsyncLoad:(NSMutableURLRequest *)request withTag:(NSString *)tag {
self.conn = [[[TagConnection alloc] initWithRequest:request delegate:self startImmediately:YES tag:tag] autorelease];
}
- (void) uploadImage {
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.mywebpage.com/upload.json"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:1000.0];
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *path = [NSString stringWithFormat:@"%@/design%i.png", docDir, designNum];
NSLog(@"%@",path);
NSData *imageData = UIImagePNGRepresentation([UIImage imageWithContentsOfFile:path]);
[Base64 initialize];
NSString *imageString = [Base64 encode:imageData];
NSUInteger length = [imageString length];
NSUInteger chunkSize = 1000;
NSUInteger thisChunkSize = length - offset > chunkSize ? chunkSize : length - offset;
NSString *chunk = [imageString substringWithRange:NSMakeRange(offset, thisChunkSize)];
offset += thisChunkSize;
NSArray *keys = [NSArray arrayWithObjects:@"design",@"design_id",@"fragment_id",nil];
NSArray *objects = [NSArray arrayWithObjects:chunk,@"design_id",[NSString stringWithFormat:@"%i", chunkNum],nil];
NSDictionary *jsonDictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary options:kNilOptions error:&error];
[request setHTTPMethod:@"POST"];
[request setValue:[NSString stringWithFormat:@"%d",[jsonData length]] forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:jsonData];
[self startAsyncLoad:request withTag:[NSString stringWithFormat:@"tag%i",chunkNum]];
if (offset > length) {
stopSending = YES;
}
}
- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSError *error;
NSArray *responseData = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
if (!responseData) {
NSLog(@"Error parsing JSON: %@", error);
} else {
if (stopSending == NO) {
chunkNum++;
[self.conn cancel];
self.conn = nil;
[self uploadImage];
} else {
NSLog(@"---------Image sent---------");
}
}
}
@end