1

我使用 --wait-event-and-download 参数运行 gphoto，这样我使用红外遥控器拍摄的照片就会保存到计算机中。

我设置了第二个脚本来中断等待过程并以编程方式拍照，如下所示：

#!/bin/sh
# shootnow.sh - stop the current gphoto2 process (if it exists),
# shoot a new image, then start a new wait-event process.

pkill -INT gphoto2     #send interrupt (i.e. ctrl+c) to gphoto2
sleep 0.1              #avoid the process ownership error
gphoto2 --capture-image-and-download  #take a picture now
gphoto2 --wait-event-and-download   #start a new wait-event process

但是我想确保第一个等待事件进程在我去中断它之前当前没有下载图像（这会导致图像填满相机内存的混乱情况，从而阻止进一步的操作）。所以第二个脚本应该更像这样：

#!/bin/sh
# shootnow-with-check.sh - stop the current gphoto2 process (if it exists 
# and isn't currently downloading an image), shoot a new image, then start 
# a new wait-event process.

shootnow() {  # same as previously, but now in a function
    pkill -INT gphoto2
    sleep 0.1
    gphoto2 --capture-image-and-download
    gphoto2 --wait-event-and-download
}

if [ ***current output line of gphoto2 process doesnt start with "Downloading"*** ] then
    shootnow
else
    echo "Capture aborted - a picture was just taken and is being saved."
fi

任何人都可以帮我解决这个 if 语句吗？我可以读取正在运行的 gphoto 进程的当前输出行吗？

4

2 回答 2

1

我最终用这样的脚本管理了这个：

#!/bin/bash
# gphoto2-expect.sh
# use expect to monitor gphoto2 during --capture-image-and-download with
# --interval=-1, adding in SIGUSR1 functionality except during a
# download event.

echo "Prepping system for camera"
killall PTPCamera
expect << 'EOS'
puts "Starting capture..."
if [catch "spawn gphoto2 --capture-image-and-download --interval=-1" gp_pid] {
  Log $ERROR "Unable to start gphoto2.\n$gp_pid\n"
  return 0
}

trap {exec kill -SIGUSR1 $gp_pid} SIGUSR1
set timeout -1
expect {
  -i $spawn_id
  "Downloading" {
    trap {send_user "\n Ignoring request as currently downloading"} SIGUSR1 ; exp_continue
  }
  "Saving file as" {
    sleep 0.1
    trap {exec kill -SIGUSR1 $gp_pid} SIGUSR1 ; exp_continue
  }
}

EOS

可以用另一个脚本触发：

#!/bin/bash
# trigger.sh - trigger an immediate capture
var=$(pidof expect)
kill -SIGUSR1 "$var"
于 2016-07-30T06:25:29.393 回答
1

gphoto2 有一个选项 --hook-script 文件名。FILENAME 必须是一个可执行的脚本，并且在一些 gphoto2 事件上被调用。然后，该脚本有一个环境变量 ACTION，您可以将其用于您的目的。例如：您调用 gphoto2 与

gphoto2 --capture-image-and-download --hook-script myhook.sh

myhook.sh 看起来像

#! /bin/bash
echo $ACTION

那么 myhook.sh 将被调用 4 次。它的输出是

init
start
download
stop

有关详细信息，请参阅 man gphoto2。

于 2016-08-20T12:01:56.150 回答