教你用Python写安卓游戏外挂

本次我们选择的安卓游戏对象叫“单词英雄”，大家可以先下载这个游戏。

游戏的界面是这样的：

通过选择单词的意思进行攻击，选对了就正常攻击，选错了就象征性的攻击一下。玩了一段时间之后琢磨可以做成自动的，通过PIL识别图片里的单词和选项，然后翻译英文成中文意思，根据中文模糊匹配选择对应的选项。

查找了N多资料以后开始动手，程序用到以下这些东西：

PIL：Python Imaging Library 大名鼎鼎的图片处理模块

pytesser：Python下用来驱动tesseract-ocr来进行识别的模块

Tesseract-OCR：图像识别引擎，用来把图像识别成文字，可以识别英文和中文，以及其它语言

autopy：Python下用来模拟操作鼠标和键盘的模块。

安装步骤(win7环境)：

(1)安装PIL，下载地址：http://www.pythonware.com/products/pil/，安装Python Imaging Library 1.1.7 for Python 2.7。

(2)安装pytesser，下载地址：http://code.google.com/p/pytesser/,下载解压后直接放在
C:/Python27/Lib/site-packages下，在文件夹下建立pytesser.pth文件，内容为C:/Python27/Lib/site-packages/pytesser_v0.0.1

(3)安装Tesseract OCR engine，下载：https://github.com/tesseract-ocr/tesseract/wiki/Downloads，下载Windows installer of tesseract-ocr 3.02.02 (including English language data)的安装文件，进行安装。

(4)安装语言包，在https://github.com/tesseract-ocr/tessdata下载chi_sim.traineddata简体中文语言包，放到安装的Tesseract OCR目标下的tessdata文件夹内，用来识别简体中文。

(5)修改C:/Python27/Lib/site-packages/pytesser_v0.0.1下的pytesser.py的函数，将原来的image_to_string函数增加语音选择参数language，language='chi_sim'就可以用来识别中文，默认为eng英文。

改好后的pytesser.py：

"""OCR in Python using the Tesseract engine from Googlehttp://code.google.com/p/pytesser/by Michael J.T. O'KellyV 0.0.1, 3/10/07"""import Imageimport subprocessimport utilimport errorstesseract_exe_name = 'tesseract' # Name of executable to be called at command linescratch_image_name = "temp.bmp" # This file must be .bmp or other Tesseract-compatible formatscratch_text_name_root = "temp" # Leave out the .txt extensioncleanup_scratch_flag = True # Temporary files cleaned up after OCR operationdef call_tesseract(input_filename, output_filename, language): """Calls external tesseract.exe on input file (restrictions on types), outputting output_filename+'txt'""" args = [tesseract_exe_name, input_filename, output_filename, "-l", language] proc = subprocess.Popen(args) retcode = proc.wait() if retcode!=0:  errors.check_for_errors()def image_to_string(im, cleanup = cleanup_scratch_flag, language = "eng"): """Converts im to file, applies tesseract, and fetches resulting text. If cleanup=True, delete scratch files after operation.""" try:  util.image_to_scratch(im, scratch_image_name)  call_tesseract(scratch_image_name, scratch_text_name_root,language)  text = util.retrieve_text(scratch_text_name_root) finally:  if cleanup:   util.perform_cleanup(scratch_image_name, scratch_text_name_root) return textdef image_file_to_string(filename, cleanup = cleanup_scratch_flag, graceful_errors=True, language = "eng"): """Applies tesseract to filename; or, if image is incompatible and graceful_errors=True, converts to compatible format and then applies tesseract. Fetches resulting text. If cleanup=True, delete scratch files after operation.""" try:  try:   call_tesseract(filename, scratch_text_name_root, language)   text = util.retrieve_text(scratch_text_name_root)  except errors.Tesser_General_Exception:   if graceful_errors:    im = Image.open(filename)    text = image_to_string(im, cleanup)   else:    raise finally:  if cleanup:   util.perform_cleanup(scratch_image_name, scratch_text_name_root) return textif __name__=='__main__': im = Image.open('phototest.tif') text = image_to_string(im) print text try:  text = image_file_to_string('fnord.tif', graceful_errors=False) except errors.Tesser_General_Exception, value:  print "fnord.tif is incompatible filetype. Try graceful_errors=True"  print value text = image_file_to_string('fnord.tif', graceful_errors=True) print "fnord.tif contents:", text text = image_file_to_string('fonts_test.png', graceful_errors=True) print text