Filename is the name of the pipe file.
filename是PIPE文件的名称。
The FileName should always be the same as the name of the class defined in that file.
FileName应该永远与定义在文件中的类名相同。
This will produce a series of thumbnails 25% the size of the real image, with a filename that is the name of the JPEG file with a thumb - prepended.
这会生成一系列大小为实际图像25%的缩略图,其文件名称是在JPEG文件名的前面加上thumb -前缀。
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