问题描述
是否有可能从亚行的shell命令读取二进制标准输出？例如，如何使用screencap所有实施例包括两个步骤：
Is it possible to read binary stdout from an adb shell command? For example, all examples of how to use screencap include two steps:
adb shell screencap -p /sdcard/foo.png
adb pull /sdcard/foo.png
不过，该服务支持写入标准输出。您可以为实例，请执行以下操作：
However, the service supports writing to stdout. You can for instance, do the following:
adb shell "screencap -p > /sdcard/foo2.png"
adb pull /sdcard/foo2.png
这同样适用。但是，这个读取输出横跨亚行？我想要做的是以下内容：
And this works equally well. But, what about reading the output across ADB? What I want to do is the following:
adb shell screencap -p > foo3.png
和避免中间写入SD卡。这会生成一些的看起来的像一个PNG文件（运行字符串foo3.png 生成一些与IHDR，IEND等），大约是相同的大小，但只要像读者有关文件已损坏。
And avoid the intermediate write to the SD card. This generates something that looks like a PNG file (running strings foo3.png generates something with an IHDR, IEND, etc.) and is approximately the same size, but the file is corrupted as far as image readers are concerned.
我也试图做到这一点使用ddmlib在Java中，结果都是一样的。我会很乐意使用任何图书馆必要的。我的目标是减少总的时间去捕捉。在我的设备，使用双命令的解决方案，它需要大约3秒获得图像。使用ddmlib和捕获标准输出时间小于900毫秒，但它不工作！
I have also attempted to do this using ddmlib in java and the results are the same. I would be happy to use any library necessary. My goal is to reduce total time to get the capture. On my device, using the two-command solution, it takes about 3 seconds to get the image. Using ddmlib and capturing stdout takes less than 900ms, but it doesn't work!
是否有可能这样做吗？
编辑：这是两个文件的hexdump更重要。第一个，screen.png来自标准输出和被破坏。第二个，xscreen是从双命令溶液和作品。的图像应在视觉上相同。
Here is the hexdump of two files. The first one, screen.png came from stdout and is corrupted. The second one, xscreen is from the two-command solution and works. The images should be visually identical.
$ hexdump -C screen.png | head
00000000 89 50 4e 47 0d 0d 0a 1a 0d 0a 00 00 00 0d 49 48 |.PNG..........IH|
00000010 44 52 00 00 02 d0 00 00 05 00 08 06 00 00 00 6e |DR.............n|
00000020 ce 65 3d 00 00 00 04 73 42 49 54 08 08 08 08 7c |.e=....sBIT....||
00000030 08 64 88 00 00 20 00 49 44 41 54 78 9c ec bd 79 |.d... .IDATx...y|
00000040 9c 1d 55 9d f7 ff 3e 55 75 f7 de b7 74 77 d2 d9 |..U...>Uu...tw..|
00000050 bb b3 27 10 48 42 16 c0 20 01 86 5d 14 04 11 dc |..'.HB.. ..]....|
00000060 78 44 9d c7 d1 d1 11 78 70 7e 23 33 8e 1b 38 33 |xD.....xp~#3..83|
00000070 ea 2c 8c 8e 0d 0a 08 a8 23 2a 0e 10 82 ac c1 40 |.,......#*.....@|
00000080 12 02 81 24 64 ef ec 5b ef fb 5d 6b 3b bf 3f ea |...$d..[..]k;.?.|
00000090 de db dd 49 27 e9 ee 74 77 3a e3 79 bf 5e 37 e7 |...I'..tw:.y.^7.|
$ hexdump -C xscreen.png | head
00000000 89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52 |.PNG........IHDR|
00000010 00 00 02 d0 00 00 05 00 08 06 00 00 00 6e ce 65 |.............n.e|
00000020 3d 00 00 00 04 73 42 49 54 08 08 08 08 7c 08 64 |=....sBIT....|.d|
00000030 88 00 00 20 00 49 44 41 54 78 9c ec 9d 77 98 1c |... .IDATx...w..|
00000040 c5 99 ff 3f d5 dd 93 37 27 69 57 5a e5 55 4e 08 |...?...7'iWZ.UN.|
00000050 24 a1 00 58 18 04 26 08 8c 01 83 31 38 c0 19 9f |$..X..&....18...|
00000060 ef 7c c6 3e 1f 70 f8 7e 67 ee 71 e2 b0 ef ce f6 |.|.>.p.~g.q.....|
00000070 f9 ec 73 04 1b 1c 31 60 23 84 30 22 88 a0 40 10 |..s...1`#.0"..@.|
00000080 08 65 69 95 d3 4a 9b c3 c4 4e f5 fb a3 67 66 77 |.ei..J...N...gfw|
00000090 a5 95 b4 bb da a4 73 7d 9e 67 55 f3 ed 50 5d dd |......s}.gU..P].|
就在看一眼这似乎是一些额外的0X0D（13）个字节得到补充。回车？这是否响钟声任何？难道是混合在一些空行？
Just at quick glance it seems like a couple of extra 0x0d (13) bytes get added. Carriage return?? Does that ring any bells? Is it mixing in some blank lines?
推荐答案
对不起，张贴回答一个老问题，但我只是过这样的问题来了自己，只想通过shell来做到这一点。这个工作很适合我：
Sorry to be posting an answer to an old question, but I just came across this problem myself and wanted to do it only through the shell. This worked well for me:
adb shell screencap -p | sed 's/^M$//' > screenshot.png
这是 ^ M 是一个char我得到了由pressing CTRL + V - > CTRL + M，只注意到它不工作时的复制粘贴。
That ^M is a char I got by pressing ctrl+v -> ctrl+m, just noticed it doesn't work when copy-pasting.
adb shell screencap -p | sed 's/\r$//' > screenshot.png
做的把戏对我来说也是如此。
did the trick for me as well.
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