Home Backend Development Python Tutorial Python mobile phone development calls DLL to implement some ADB functions

Python mobile phone development calls DLL to implement some ADB functions

Oct 18, 2016 am 10:34 AM

I have learned a little bit of Python recently, and I happen to have a pre-research work on mobile phone synchronization tools to complete.

To achieve communication between PC and mobile phone, you must first find their communication protocol. Fortunately, Android has a complete protocol: ADB

ADB’s code is open source and supports the Windows platform. There are ready-made DLLs that can be called: AdbWinApi.dll, AdbWinUsbApi.dll

Okay, it can be done with VC, but I wanted to try it with Python, so I started the arduous process of checking information + experimenting.


I won’t go into details about the experimental process. Since the above two DLLs are implemented in C, and the provided header files are also in C language, we have the following python test program (Python2.7):

import ctypes
   
#自定义的GUID结构,有兴趣的可以自己研究用uuid模块 
class GUID(ctypes.Structure):
    _fields_ = [("Data1", ctypes.c_ulong),
                ("Data2", ctypes.c_ushort),
                ("Data3", ctypes.c_ushort),
                ("Data4", ctypes.c_ubyte*8)]
   
#自己定义的一个结构体,便于使用DLL接口 
class AdbInterfaceInfo(ctypes.Structure):
    _fields_ = [("class_id", GUID),
                ("flags", ctypes.c_ulong),
                ("device_name", ctypes.c_wchar*800)]
   
def strGUID(GUID):
    string = ''
    string = string + '%x' % buff.class_id.Data1 + '-%x' % buff.class_id.Data2 + '-%x' %buff.class_id.Data3
    string = string + '-%x' % buff.class_id.Data4[0]
    string = string + '%x' % buff.class_id.Data4[1]
    string = string + '%x' % buff.class_id.Data4[2]
    string = string + '%x' % buff.class_id.Data4[3]
    string = string + '%x' % buff.class_id.Data4[4]
    string = string + '%x' % buff.class_id.Data4[5]
    string = string + '%x' % buff.class_id.Data4[6]
    string = string + '%x' % buff.class_id.Data4[7]
    return string
   
dll = ctypes.cdll.LoadLibrary('AdbWinApi.dll')
usb_class_id = GUID(0xF72FE0D4, 0xCBCB, 0x407d, (0x88, 0x14, 0x9e, 0xd6, 0x73, 0xd0, 0xdd, 0x6b))
enum_handle = dll.AdbEnumInterfaces(usb_class_id, ctypes.c_bool('true'), ctypes.c_bool('true'), ctypes.c_bool('true'))
   
while(1):
    buff = AdbInterfaceInfo()
    size = ctypes.c_ulong(ctypes.sizeof(buff))
    status = dll.AdbNextInterface(enum_handle, ctypes.byref(buff), ctypes.byref(size))
   
    if status==1:
        #print "GUID = " + strGUID(buff.class_id) 
        #print "status = " + str(status) 
        #print "Name = " + str(buff.device_name) 
        hAdbApi = dll.AdbCreateInterfaceByName(buff.device_name);
        if hAdbApi == 0:
            print 'AdbCreateInterfaceByName Fail'
        else:
            serial = ' '*128
            pserial = ctypes.c_char_p()
            pserial.value = serial
            serial_len = ctypes.c_ulong(len(serial))
            ret = dll.AdbGetSerialNumber(hAdbApi, pserial, ctypes.byref(serial_len), ctypes.c_bool('false'));
            if ret == 1:
                print 'Device Name: ' + '%s'% serial
            else:
                print 'Get Device Name Fail'
    else:
        print 'Finished'
        break
import ctypes
#自定义的GUID结构,有兴趣的可以自己研究用uuid模块
class GUID(ctypes.Structure):
    _fields_ = [("Data1", ctypes.c_ulong),
                ("Data2", ctypes.c_ushort),
                ("Data3", ctypes.c_ushort),
                ("Data4", ctypes.c_ubyte*8)]
#自己定义的一个结构体,便于使用DLL接口
class AdbInterfaceInfo(ctypes.Structure):
    _fields_ = [("class_id", GUID),
                ("flags", ctypes.c_ulong),
                ("device_name", ctypes.c_wchar*800)]
def strGUID(GUID):
    string = ''
    string = string + '%x' % buff.class_id.Data1 + '-%x' % buff.class_id.Data2 + '-%x' %buff.class_id.Data3
    string = string + '-%x' % buff.class_id.Data4[0]
    string = string + '%x' % buff.class_id.Data4[1]
    string = string + '%x' % buff.class_id.Data4[2]
    string = string + '%x' % buff.class_id.Data4[3]
    string = string + '%x' % buff.class_id.Data4[4]
    string = string + '%x' % buff.class_id.Data4[5]
    string = string + '%x' % buff.class_id.Data4[6]
    string = string + '%x' % buff.class_id.Data4[7]
    return string
dll = ctypes.cdll.LoadLibrary('AdbWinApi.dll')
usb_class_id = GUID(0xF72FE0D4, 0xCBCB, 0x407d, (0x88, 0x14, 0x9e, 0xd6, 0x73, 0xd0, 0xdd, 0x6b))
enum_handle = dll.AdbEnumInterfaces(usb_class_id, ctypes.c_bool('true'), ctypes.c_bool('true'), ctypes.c_bool('true'))
while(1):
    buff = AdbInterfaceInfo()
    size = ctypes.c_ulong(ctypes.sizeof(buff))
    status = dll.AdbNextInterface(enum_handle, ctypes.byref(buff), ctypes.byref(size))
    if status==1:
        #print "GUID = " + strGUID(buff.class_id)
        #print "status = " + str(status)
        #print "Name = " + str(buff.device_name)
        hAdbApi = dll.AdbCreateInterfaceByName(buff.device_name);
        if hAdbApi == 0:
            print 'AdbCreateInterfaceByName Fail'
        else:
            serial = ' '*128
            pserial = ctypes.c_char_p()
            pserial.value = serial
            serial_len = ctypes.c_ulong(len(serial))
            ret = dll.AdbGetSerialNumber(hAdbApi, pserial, ctypes.byref(serial_len), ctypes.c_bool('false'));
            if ret == 1:
                print 'Device Name: ' + '%s'% serial
            else:
                print 'Get Device Name Fail'
    else:
        print 'Finished'
        break
Copy after login

The above simple Python code can use the two DLLs AdbWinApi.dll and AdbWinUsbApi.dll to find the Android device connected to your PC.

Only 3 DLL interfaces have been called, but the purpose has been achieved. The following conclusion can be drawn:

It is feasible to use Python to call DLL to implement the ADB tool, but of course there will be a lot of trouble.


Written at the end, it is quite troublesome for Python to call a DLL written in C, especially parameter passing, especially pointer processing, which requires the ctypes module. . .


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