iphone - 如何从凹凸中使用多个 block 进行 NSKeyedUnarchiver ？

Question

遇到这个问题我想通过bump发送图像，但是bump api的最大块是256kb

 if([[NSKeyedArchiver archivedDataWithRootObject:self.selectedImg]length] > 262144)
    {
        int dlen = [[NSKeyedArchiver
                     archivedDataWithRootObject:self.selectedImg] length];
        NSLog(@"Sending data: %i bytes in %d chunks",dlen,
              (int)ceil(((float)dlen / 262144.0f)));
        for (int i=1; i <= (int)ceil(((float)dlen / 262144.0f)); i++) {
            int maxr=0;
            if ((262144*i) > dlen) {
                maxr = dlen-(262144*(i-1));
            } else {
                maxr = 262144;
            }

            NSData *moveChunk = [[NSKeyedArchiver
                                  archivedDataWithRootObject:self.selectedImg]
                                 subdataWithRange:NSMakeRange(262144*(i-1),maxr)];
            NSLog(@"Sending Chunk: %d, %d bytes",i,[moveChunk length]);
            [bumpObject sendData:moveChunk];
        }
    }
    else
    {
        //Data is 254kb or under
        NSData *moveChunk = [NSKeyedArchiver
                             archivedDataWithRootObject:self.selectedImg];
        [bumpObject sendData:moveChunk];
    } 

如何将所有 block 编译在一起？

花了3个小时，还是没解决。

Answer 1

好吧，我还没有真正尝试过这个，但这里是。

在接收端，获取接收到的 NSData 对象，并将它们聚合到 NSMutableData 的实例中 -[NSMutableData appendData:]或-[NSMutableData appendBytes:length:] . (从-[NSData bytes]和-[NSData length]获取字节

然后，使用+[NSKeyedUnarchiver unarchiveObjectWithData:]取回图像.

...像这样(设置一个 NSMutableData 属性，假设名为 receivedImageData )...

- (void) bumpDataReceived:(NSData *)chunk {
    if (!self.receivedImageData) {
        self.receivedImageData = [NSMutableData dataWithCapacity:[chunk length]];
        [self.receivedImageData setData:chunk];
    } else {
        [self.receivedImageData appendData:chunk];
    }
}

...然后，当你得到最后一个 block (它的大小不等于 -bumpSessionEnded: 中的 262144？？)时，使用

返回图像对象

UIImage* receivedImage = [NSKeyedUnarchiver unarchiveObjectWithData:self.receivedImageData];

完成!