如何通过SOAP API锁定VirtualBox以获取屏幕截图

Question

我正在尝试使用Python调用Virtualbox 6.1的SOAP接口来获取虚拟机的截图。我可以启动这台虚拟机，但是当我尝试获取屏幕布局时会遇到锁定错误。

以下是代码：

import zeep

# helper to show the session lock status
def show_lock_state(session_id):
    session_state = service.ISession_getState(session_id)
    print('current session state:', session_state)

# connect
client = zeep.Client('http://127.0.0.1:18083?wsdl')
service = client.create_service("{http://www.virtualbox.org/}vboxBinding", 'http://127.0.0.1:18083?wsdl')
manager_id = service.IWebsessionManager_logon('fakeuser', 'fakepassword')
session_id = service.IWebsessionManager_getSessionObject(manager_id)

# get the machine id and start it
machine_id = service.IVirtualBox_findMachine(manager_id, 'Debian')
progress_id = service.IMachine_launchVMProcess(machine_id, session_id, 'gui')
service.IProgress_waitForCompletion(progress_id, -1)

print('Machine has been started!')
show_lock_state(session_id)

# unlock and then lock to be sure, doesn't have any effect apparently

service.ISession_unlockMachine(session_id)
service.IMachine_lockMachine(machine_id, session_id, 'Shared')


show_lock_state(session_id)

console_id = service.ISession_getConsole(session_id)
display_id = service.IConsole_getDisplay(console_id)
print(service.IDisplay_getGuestScreenLayout(display_id))

机器已正确启动，但最后一行显示错误信息VirtualBox错误：rc=0x80004001，根据我查阅的资料，这意味着会话被锁定。

我尝试释放并重新获取锁，但即使成功执行，错误仍然存在。我查看了文档，但无法找到其他类型的锁，除了不适用于此处正在运行的机器的写锁。我无法在任何语言中找到任何示例。

- Jacopofar

Answer 1

我发现了一个名为VBoxManager的Android应用程序，具有此SOAP截图功能。通过MITM代理运行它，我重构了它执行的调用，并将它们编写为Zeep等效项。如果有人将来感兴趣，上述脚本的最后几行现在是：

console_id = service.ISession_getConsole(session_id)
display_id = service.IConsole_getDisplay(console_id)
resolution = service.IDisplay_getScreenResolution(display_id, 0)
print(f'display data: {resolution}')

image_data = service.IDisplay_takeScreenShotToArray(
    display_id,
    0,
    resolution['width'],
    resolution['height'],
    'PNG')

with open('screenshot.png', 'wb') as f:
    f.write(base64.b64decode(image_data))

- Jacopofar