问题描述
我想从网络上获取GIF图像，但是我发现如果下载整个GIF图像，将会导致大量的网络流量.
I would like to get a GIF image from the network, but I found that if I download the whole GIF image, it would cause a lot of network traffic.
我可以只获取GIF图像的第一帧而不下载其他所有帧吗?
Can I get only the first frame of a GIF image without downloading all the other frames?
推荐答案
好吧，我还没有找到现成的解决方案，但是您可以这样做(它会导致一些低级"的窍门) ):
Well, I haven't found ready-to-use solution, but you can do this way (it'll lead to some "low-level" tricks):
按照有关GIF的维基，可以将动画gif文件拆分为帧，然后结束容易识别.因此，您需要阅读GIF标头，屏幕信息，有关动画的信息到缓冲区，下载第一帧并附加信息，例如GIF已结束(Wiki文章后的"3B").而且，如果您将此数据复制到单独的缓冲区中，则可以继续整个文件下载，而无需重新下载第一帧.
Following wiki about GIFs, animated gif files can be splitted into frames, and end of frame can be easily recognized. So, you'll need to read GIF header, screen information, information about animation into buffer, download first frame and append information like GIF is ended ("3B" following wiki article). And, if you copy this data into separate bufer, you'll be able to continue whole file downloading without re-downloading first frame.
您还可以编辑标题信息，以将第一帧格式设置为静态gif.
Also you can edit header information to format first frame into static gif.
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