如何使用Python查看Windows服務依賴關係？

Question

使用Windows服務控制檯，可以在「屬性」>「依賴項」下看到服務依賴項。你如何使用Python獲得相同的信息？有沒有辦法與psutil做到這一點？

Answer 1

您可以使用subprocess模塊查詢sc.exe以獲取您的服務信息，然後解析出依賴關係信息。喜歡的東西：

import subprocess 

def get_service_dependencies(service): 
    try: 
     dependencies = [] # hold our dependency list 
     info = subprocess.check_output(["sc", "qc", service], universal_newlines=True) 
     dep_index = info.find("DEPENDENCIES") # find the DEPENDENCIES entry 
     if dep_index != -1: # make sure we have a dependencies entry 
      for line in info[dep_index+12:].split("\n"): # loop over the remaining lines 
       entry, value = line.rsplit(":", 2) # split each line to entry : value 
       if entry.strip(): # next entry encountered, no more dependencies 
        break # nothing more to do... 
       value = value.strip() # remove the whitespace 
       if value: # if there is a value... 
        dependencies.append(value) # add it to the dependencies list 
     return dependencies or None # return None if there are no dependencies 
    except subprocess.CalledProcessError: # sc couldn't query this service 
     raise ValueError("No such service ({})".format(service)) 

然後你就可以輕鬆地查詢依賴關係：

print(get_service_dependencies("wudfsvc")) # query Windows Driver Foundation service 
# ['PlugPlay', 'WudfPf']