Question

当我用腻子运行foo.jpg时，我确实在树莓派上有一个Python脚本来拍照。

但是，当我使用paramiko运行它时，foo.jpg未创建，但是脚本按预期运行（它会打印“捕获的foo.jpg”。）

class RemoteServer():
    def __init__(self, ip, port, username, password):
        self.ip = ip
        self.port = port
        self.username = username
        self.password = password

class RemoteHelper():
    def __init__(self, paramiko_ssh_object):
        self.ssh = paramiko_ssh_object

    def waitForExecCommandEnd(self, channel, command):
        """
        Block untill the end of a command executed by Paramiko.ssh.exec_command
            -channel : (channel) channel stdout returned by Paramiko.ssh.exec_command
            -command : (string) command to run
        """
        while not channel.exit_status_ready():
            print "Waiting for end of {}".format(command)
            time.sleep(1)

    def runRemoteCommand(self, command):
        """
        Run a command on the remote server via ssh and block until it ends
            -command : (string) command to run
        """
        print "running {}".format(command)
        a, stdout, stderr = self.ssh.exec_command(command)
        self.waitForExecCommandEnd(stdout.channel, command)
        for line in stdout.readlines():
            print line
        for line in stderr.readlines():
            print li

def authentificate(ssh, rpi):
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    print "Connection a %s:%s user=%s mdp=XXXXXXXXX" % (rpi.ip, rpi.port, rpi.username)
    ssh.connect(rpi.ip, port=rpi.port, username=rpi.username, password=rpi.password)

rpi = RemoteServer("192.168.1.20", 22, "pi", "raspberry")
ssh = paramiko.SSHClient()
authentificate(ssh, rpi)
remoteHelper = RemoteHelper(ssh)
remoteHelper.runRemoteCommand("sudo python /home/pi/camera/pictaker.py")

这是RPI上的脚本：

#!/usr/bin/env python
# --*-- encoding: utf-8 --*--

from time import sleep
from picamera import PiCamera

#camera conf
camera = PiCamera()
camera.resolution = (2592, 1944)
camera.vflip = True
camera.framerate = 5

#camera warmpup
print "preparing camera"
camera.start_preview()
sleep(2)

#taking pic
camera.capture('foo.jpg')
print "foo.jpg captured"
camera.close()

是由于某些unix权限引起的吗？

谢谢。

Answer 1

尝试：
1）打印（camera.capture（'foo.jpg'）以查看是否返回0
2）尝试将'foo.jpg'更改为'/tmp/foo.jpg'，也许它捕获了图像，但是将其保存到相同的其他路径，而您不知道在哪里
编辑：
3）您可以尝试，但是运行起来并不简单，运行sudo strace -f -o /tmp/strace.out。然后您会看到是否存在任何“权限被拒绝”或其他情况

使用paramiko在ssh上运行python脚本无法正常工作

1 个答案: