如何使用的BitmapEncoder产生，当我在做一个循环重复GIF [英] How do I make a GIF repeat in loop when generating with BitmapEncoder

问题描述

我能够使用的BitmapEncoder（C＃，WinRT的）来创建一个gif动画。不过，我一直无法弄清楚如何使GIF回环从头开始？

I am able to use BitmapEncoder (C#, WinRT) to create an animated gif. However, I haven't been able to figure out how to make the GIF loop back and start from scratch?

因为我不知道该怎么没太大尝试尝试。搜索更多性能上的GIF设置，但找不到任何相对的。

Didn't try much because I am not sure what to try. Searched for more properties to set on the GIF, but could not find anything relative.

推荐答案

好吧，终于能够看着办吧出。显然，你需要将以下metdata添加到GIF得到它的循环：

Okay, finally been able to figure it out. Apparently you need to add the following metdata to the GIF to get it to loop:

BitmapPropertySet properties = await encoder.BitmapProperties.GetPropertiesAsync("/appext/Data");
properties = new BitmapPropertySet()
{
    {
        "/appext/Application",
        new BitmapTypedValue(Iso8859.Default.GetBytes("NETSCAPE2.0"), Windows.Foundation.PropertyType.UInt8Array)
    },
    { 
        "/appext/Data",
        new BitmapTypedValue(new byte[] { 3, 1, 0, 0, 0 }, Windows.Foundation.PropertyType.UInt8Array)
    },
};

await encoder.BitmapProperties.SetPropertiesAsync(properties);

如果你没有在你的项目有ISO8859，只需将用于NETSCAPE2的ASCII码。 0作为有一个字节数组。

If you don't have an Iso8859 in your project, simply place the ascii code for "NETSCAPE2.0" as a byte array in there.

这篇关于如何使用的BitmapEncoder产生，当我在做一个循环重复GIF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！