转：ios的图片文件上传代码

转自： https://gist.github.com/igaiga/1354221

@interface ImageUploader : NSObject {

NSData *theImage;

}

@property (retain) NSData *theImage;

- (void) syncUpload:(NSData *) uploadImage;

@end

#import "ImageUploader.h"

#define NOTIFY_AND_LEAVE(X) {[self cleanup:X]; return;}

#define DATA(X) [X dataUsingEncoding:NSUTF8StringEncoding]

// Posting constants

#define IMAGE_CONTENT @"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n"

#define BOUNDARY @"------------0x0x0x0x0x0x0x0x"

@implementation ImageUploader

@synthesize theImage;

- (void) syncUpload:(NSData *) uploadImage

{

self.theImage = uploadImage;

[self main];

}

- (void) cleanup: (NSString *) output

{

self.theImage = nil;

// NSLog(@"******** %@", output);

}

- (NSData*)generateFormDataFromPostDictionary:(NSDictionary*)dict

{

id boundary = BOUNDARY;

NSArray* keys = [dict allKeys];

NSMutableData* result = [NSMutableData data];

for (int i = 0; i < [keys count]; i++)

{

id value = [dict valueForKey: [keys objectAtIndex:i]];

[result appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

if ([value isKindOfClass:[NSData class]])

{

// handle image data

NSString *formstring = [NSString stringWithFormat:IMAGE_CONTENT, [keys objectAtIndex:i]];

[result appendData: DATA(formstring)];

[result appendData:value];

}

NSString *formstring = @"\r\n";

[result appendData:DATA(formstring)];

}

NSString *formstring =[NSString stringWithFormat:@"--%@--\r\n", boundary];

[result appendData:DATA(formstring)];

return result;

}

// NSOperationQueueによる非同期化を見据えてmainにしています。

- (void) main

{

if (!self.theImage) {

NOTIFY_AND_LEAVE(@"Please set image before uploading.");

}

NSString* MultiPartContentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", BOUNDARY];

NSMutableDictionary* post_dict = [[NSMutableDictionary alloc] init];

[post_dict setObject:@"testimage" forKey:@"filename"];

[post_dict setObject:self.theImage forKey:@"data[User][image]"];

NSData *postData = [self generateFormDataFromPostDictionary:post_dict];

[post_dict release];

NSString *baseurl = @"https://example.com/api/upload_image";

NSURL *url = [NSURL URLWithString:baseurl];

NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];

if (!urlRequest) NOTIFY_AND_LEAVE(@"Error creating the URL Request");

[urlRequest setHTTPMethod: @"POST"];

[urlRequest setValue:MultiPartContentType forHTTPHeaderField: @"Content-Type"];

[urlRequest setHTTPBody:postData];

NSError *error;

NSURLResponse *response;

NSData* result = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&error];

//NSLog(@"***** result =%@", result);

if (!result)

{

[self cleanup:[NSString stringWithFormat:@"upload error: %@", [error localizedDescription]]];

return;

}

// Return results

NSString *outstring = [[[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding] autorelease];

NSLog(@"***** outstring =%@", outstring);

[self cleanup: outstring];

}

@end