- (BOOL)sendPhotoToTumblr:(NSString *)photo withCaption:(NSString *)caption;

{

        //get image data from file

        NSData *imageData = [NSData dataWithContentsOfFile:photo];       

        //stop on error

        if (!imageData) return NO;

       

        //Create dictionary of post arguments

        NSArray *keys = [[NSArray alloc] initWithObjects:@"email",@"password",@"type",@"caption",nil];

        NSArray *objects = [[NSArray alloc] initWithObjects:

                        [NSString stringWithFormat:@"%@",CFPreferencesCopyAppValue(CFSTR("TumblrEmail"), kCFPreferencesCurrentApplication)],

                        [NSString stringWithFormat:@"%@",CFPreferencesCopyAppValue(CFSTR("TumblrPassword"), kCFPreferencesCurrentApplication)],

                        @"photo", caption, nil];

        NSDictionary *keysDict = [[NSDictionary alloc] initWithObjects:objects forKeys:keys];

       

        //create tumblr photo post

        NSURLRequest *tumblrPost = [self createTumblrRequest:keysDict withData:imageData];

       

        //send request, return YES if successful

        tumblrConnection = [[NSURLConnection alloc] initWithRequest:tumblrPost delegate:self];

        if (!tumblrConnection) {

                NSLog(@"Failed to submit request");

                return NO;

        } else {

                NSLog(@"Request submitted");

                receivedData = [[NSMutableData data] retain];

                return YES;

        }

}

-(NSURLRequest *)createTumblrRequest:(NSDictionary *)postKeys withData:(NSData *)data

{

        //create the URL POST Request to tumblr

        NSURL *tumblrURL = [NSURL URLWithString:@"http://www.tumblr.com/api/write"];

        NSMutableURLRequest *tumblrPost = [NSMutableURLRequest requestWithURL:tumblrURL];

        [tumblrPost setHTTPMethod:@"POST"];

       

        //Add the header info

        NSString *stringBoundary = [NSString stringWithString:@"0xKhTmLbOuNdArY"];

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

        [tumblrPost addValue:contentType forHTTPHeaderField: @"Content-Type"];

       

        //create the body

        NSMutableData *postBody = [NSMutableData data];

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

       

        //add key values from the NSDictionary object

        NSEnumerator *keys = [postKeys keyEnumerator];

        int i;

        for (i = 0; i < [postKeys count]; i++) {

                NSString *tempKey = [keys nextObject];

                [postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",tempKey] dataUsingEncoding:NSUTF8StringEncoding]];

                [postBody appendData:[[NSString stringWithFormat:@"%@",[postKeys objectForKey:tempKey]] dataUsingEncoding:NSUTF8StringEncoding]];

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

        }

        //add data field and file data

        [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"data\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

        [postBody appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

        [postBody appendData:[NSData dataWithData:data]];

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

       

        //add the body to the post

        [tumblrPost setHTTPBody:postBody];

        return tumblrPost;

}

1. 设置HttpWebRequest的Content-Type，一定boundary，这里是--ABCD