Python mobile phone development calls DLL to implement some ADB functions

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

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. . .