python - 执行一些步骤后,无法从网页中获取动态填充的数字
问题描述
我使用 requests 模块和 BeautifulSoup 库创建了一个脚本来从网页中获取一些表格内容。要生成表格,必须手动执行我在附图中显示的步骤。我在下面粘贴的代码是一个有效的代码,但我试图解决的主要问题是以title
编程方式获取数字,在这种情况下628086906
,它附加到table_link
我在这里硬编码的数字上。
单击工具按钮后 - 在步骤 6 中 - 当您将光标悬停在地图上时,您可以看到此选项Multiple
,当您单击该选项时,您会看到包含标题编号的 url。
这正是脚本所遵循的步骤。
这是0030278592
在步骤 6 中输入框中输入的 linc 编号。
我已经尝试过(工作一个,因为我在其中使用了硬编码的标题号table_link
):
import requests
from bs4 import BeautifulSoup
link = 'https://alta.registries.gov.ab.ca/spinii/logon.aspx'
lnotice = 'https://alta.registries.gov.ab.ca/spinii/legalnotice.aspx'
search_page = 'https://alta.registries.gov.ab.ca/SpinII/SearchSelectType.aspx'
map_page = 'http://alta.registries.gov.ab.ca/SpinII/mapindex.aspx'
map_find = 'http://alta.registries.gov.ab.ca/SpinII/mapfinds.aspx'
table_link = 'https://alta.registries.gov.ab.ca/SpinII/popupTitleSearch.aspx?title=628086906'
def get_content(s,link):
r = s.get(link)
soup = BeautifulSoup(r.text,"lxml")
payload = {i['name']:i.get('value','') for i in soup.select('input[name]')}
payload['uctrlLogon:cmdLogonGuest.x'] = '80'
payload['uctrlLogon:cmdLogonGuest.y'] = '20'
r = s.post(link,data=payload)
soup = BeautifulSoup(r.text,"lxml")
payload = {i['name']:i.get('value','') for i in soup.select('input[name]')}
payload['cmdYES.x'] = '52'
payload['cmdYES.y'] = '8'
s.post(lnotice,data=payload)
s.headers['Referer'] = 'https://alta.registries.gov.ab.ca/spinii/welcomeguest.aspx'
s.get(search_page)
s.headers['Referer'] = 'https://alta.registries.gov.ab.ca/SpinII/SearchSelectType.aspx'
s.get(map_page)
r = s.get(map_find)
s.headers['Referer'] = 'http://alta.registries.gov.ab.ca/SpinII/mapfinds.aspx'
soup = BeautifulSoup(r.text,"lxml")
payload = {i['name']:i.get('value','') for i in soup.select('input[name]')}
payload['__EVENTTARGET'] = 'Finds$lstFindTypes'
payload['Finds:lstFindTypes'] = 'Linc'
payload['Finds:ctlLincNumber:txtLincNumber'] = '0030278592'
r = s.post(map_find,data=payload)
r = s.get(table_link)
print(r.text)
if __name__ == "__main__":
with requests.Session() as s:
s.headers['User-Agent'] = 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36'
get_content(s,link)
如何从 url 中获取标题号?
或者
如何从该站点获取所有 linc 号码,以便我根本不需要使用地图?
The only problem with this site is that it is unavailable in daytime for maintenance.
解决方案
数据从以下位置调用:
POST http://alta.registries.gov.ab.ca/SpinII/mapserver.aspx
内容在被OpenLayers 库使用之前以自定义格式编码。所有的解码都位于这个 JS 文件中。如果你美化它,你可以寻找它的WayTo.Wtb.Format.WTB
解码OpenLayers.Class
。二进制文件在 JS 中逐字节解码,如下所示:
switch(elementType){
case 1:
var lineColor = new WayTo.Wtb.Element.LineColor();
byteOffset = lineColor.parse(dataReader, byteOffset);
outputElement = lineColor;
break;
case 2:
var lineStyle = new WayTo.Wtb.Element.LineStyle();
byteOffset = lineStyle.parse(dataReader, byteOffset);
outputElement = lineStyle;
break;
case 3:
var ellipse = new WayTo.Wtb.Element.Ellipse();
byteOffset = ellipse.parse(dataReader, byteOffset);
outputElement = ellipse;
break;
........
}
我们必须重现这个解码算法才能得到原始数据。我们不需要解码所有的对象,我们只想得到正确的偏移量并strings
正确提取。这是解码部分的python脚本,它从文件中解码数据( curl的输出):
with open("wtb.bin", mode='rb') as file:
encodedData = file.read()
offset = 0
objects = []
while offset < len(encodedData):
elementSize = encodedData[offset]
offset+=1
elementType = encodedData[offset]
offset+=1
if elementType == 0:
break
curElemSize = elementSize
curElemType = elementType
if elementType== 114:
largeElementSize = int.from_bytes(encodedData[offset:offset + 4], "big")
offset+=4
largeElementType = int.from_bytes(encodedData[offset:offset+2], "little")
offset+=2
curElemSize = largeElementSize
curElemType = largeElementType
print(f"type {curElemType} | size {curElemSize}")
offsetInit = offset
if curElemType == 1:
offset+=4
elif curElemType == 2:
offset+=2
elif curElemType == 3:
offset+=20
elif curElemType == 4:
offset+=28
elif curElemType == 5:
offset+=12
elif curElemType == 6:
textLength = curElemSize - 3
objects.append({
"type": "Text",
"x_position": int.from_bytes(encodedData[offset:offset+2], "little"),
"y_position": int.from_bytes(encodedData[offset+2:offset+4], "little"),
"rotation": int.from_bytes(encodedData[offset+4:offset+6], "little"),
"text": encodedData[offset+6:offset+6+(textLength*2)].decode("utf-8").replace('\x00','')
})
offset+=6+(textLength*2)
elif curElemType == 7:
numPoint = int(curElemSize / 2)
offset+=4*numPoint
elif curElemType == 27:
numPoint = int(curElemSize / 4)
offset+=8*numPoint
elif curElemType == 8:
numPoint = int(curElemSize / 2)
offset+=4*numPoint
elif curElemType == 28:
numPoint = int(curElemSize / 4)
offset+=8*numPoint
elif curElemType == 13:
offset+=4
elif curElemType == 14:
offset+=2
elif curElemType == 15:
offset+=2
elif curElemType == 100:
pass
elif curElemType == 101:
offset+=20
elif curElemType == 102:
offset+=2
elif curElemType == 103:
pass
elif curElemType == 104:
highShort = int.from_bytes(encodedData[offset+2:offset+4], "little")
lowShort = int.from_bytes(encodedData[offset+4:offset+6], "little")
objects.append({
"type": "StartNumericCell",
"entity": int.from_bytes(encodedData[offset:offset+2], "little"),
"occurrence": (highShort << 16) + lowShort
})
offset+=6
elif curElemType == 105:
#end cell
pass
elif curElemType == 109:
textLength = curElemSize - 1
objects.append({
"type": "StartAlphanumericCell",
"entity": int.from_bytes(encodedData[offset:offset+2], "little"),
"occurrence":encodedData[offset+2:offset+2+(textLength*2)].decode("utf-8").replace('\x00','')
})
offset+=2+(textLength*2)
elif curElemType == 111:
offset+=40
elif curElemType == 112:
objects.append({
"type": "CoordinatePlane",
"projection_code": encodedData[offset+48:offset+52].decode("utf-8").replace('\x00','')
})
offset+=52
elif curElemType == 113:
offset+=24
elif curElemType == 256:
nameLength = int.from_bytes(encodedData[offset+14:offset+16], "little")
objects.append({
"type": "LargePolygon",
"name": encodedData[offset+16:offset+16+nameLength].decode("utf-8").replace('\x00',''),
"occurence": int.from_bytes(encodedData[offset+2:offset+6], "little")
})
if nameLength > 0:
offset+= 16 + nameLength
if encodedData[offset] == 0:
offset+=1
else:
offset+= 16
numberOfPoints = int.from_bytes(encodedData[offset:offset+2], "little")
offset+=2
offset+=numberOfPoints*8
elif curElemType == 257:
pass
else:
offset+= curElemSize*2
print(f"offset diff {offset-offsetInit}")
print("--------------------------------")
print(objects)
print(len(encodedData))
print(offset)
(旁注:注意元素大小是大端,所有其他值都是小端)
运行此 repl.it以查看它如何解码文件
从那里我们构建了抓取数据的步骤,为了清楚起见,我将描述所有步骤(甚至是您已经弄清楚的那些步骤):
登录
使用以下方式登录网站:
GET https://alta.registries.gov.ab.ca/spinii/logon.aspx
抓取输入名称/值并添加uctrlLogon:cmdLogonGuest.x
然后uctrlLogon:cmdLogonGuest.y
调用
POST https://alta.registries.gov.ab.ca/spinii/logon.aspx
法律声明
法律通知电话不是获取地图值所必需的,而是获取项目信息所必需的(您帖子中的最后一步)
GET https://alta.registries.gov.ab.ca/spinii/legalnotice.aspx
刮掉input
标签名称/值并设置cmdYES.x
然后cmdYES.y
调用
POST https://alta.registries.gov.ab.ca/spinii/legalnotice.aspx
地图数据
调用服务器地图 API:
POST http://alta.registries.gov.ab.ca/SpinII/mapserver.aspx
使用以下数据:
{
"mt":"titleresults",
"qt":"lincNo",
"LINCNumber": lincNumber,
"rights": "B", #not required
"cx": 1920, #screen definition
"cy": 1080,
}
cx
/xy
是画布大小
使用上述方法对编码数据进行解码。你会得到 :
[{'type': 'LargePolygon', 'name': '0010495134 8722524;1;162', 'entity': 23, 'occurence': 628079167, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0012170859 8022146;8;99', 'entity': 23, 'occurence': 628048595, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0010691822 8722524;1;163', 'entity': 23, 'occurence': 628222354, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0012169736 8022146;8;89', 'entity': 23, 'occurence': 628021327, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0010694454 8722524;1;179', 'entity': 23, 'occurence': 628191678, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0010694362 8722524;1;178', 'entity': 23, 'occurence': 628307403, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0010433381 8722524;1;177', 'entity': 23, 'occurence': 628209696, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0012169710 8022146;8;88A', 'entity': 23, 'occurence': 628021328, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0010694355 8722524;1;176', 'entity': 23, 'occurence': 628315826, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0012170866 8022146;8;100', 'entity': 23, 'occurence': 628163431, 'line_color_green': 0, 'line_color_red': 129, 'line_color_blue': 129, 'fill_color_green': 255, 'fill_color_red': 255, 'fill_color_blue': 180}, {'type': 'LargePolygon', 'name': '0010694347 8722524;1;175', 'entity': 23, 'occurence': 628132810, 'line_color_green': 0, 'line_color_red': 129,
提取信息
如果您想针对特定对象,lincNumber
您将需要查找多边形的样式,因为对于“多个”值(例如具有多个项目的值),没有提及lincNumber
响应的 id,只是一个链接参考。以下将获得选定的项目:
selectedZone = [
t
for t in objects
if t.get("fill_color_green", 255) < 255 and t.get("line_color_red") == 255
][0]
print(selectedZone)
调用您在帖子中提到的网址以获取数据并提取表格:
GET https://alta.registries.gov.ab.ca/SpinII/popupTitleSearch.aspx?title={selectedZone["occurence"]}
完整代码:
import requests
from bs4 import BeautifulSoup
import pandas as pd
lincNumber = "0030278592"
#lincNumber = "0010661156"
s = requests.Session()
# 1) login
r = s.get("https://alta.registries.gov.ab.ca/spinii/logon.aspx")
soup = BeautifulSoup(r.text, "html.parser")
payload = dict([
(t["name"], t.get("value", ""))
for t in soup.findAll("input")
])
payload["uctrlLogon:cmdLogonGuest.x"] = 76
payload["uctrlLogon:cmdLogonGuest.y"] = 25
s.post("https://alta.registries.gov.ab.ca/spinii/logon.aspx",data=payload)
# 2) legal notice
r = s.get("https://alta.registries.gov.ab.ca/spinii/legalnotice.aspx")
soup = BeautifulSoup(r.text, "html.parser")
payload = dict([
(t["name"], t.get("value", ""))
for t in soup.findAll("input")
])
payload["cmdYES.x"] = 82
payload["cmdYES.y"] = 3
s.post("https://alta.registries.gov.ab.ca/spinii/legalnotice.aspx", data = payload)
# 3) map data
r = s.post("http://alta.registries.gov.ab.ca/SpinII/mapserver.aspx",
data= {
"mt":"titleresults",
"qt":"lincNo",
"LINCNumber": lincNumber,
"rights": "B", #not required
"cx": 1920, #screen definition
"cy": 1080,
})
def decodeWtb(encodedData):
offset = 0
objects = []
iteration = 0
while offset < len(encodedData):
elementSize = encodedData[offset]
offset+=1
elementType = encodedData[offset]
offset+=1
if elementType == 0:
break
curElemSize = elementSize
curElemType = elementType
if elementType== 114:
largeElementSize = int.from_bytes(encodedData[offset:offset + 4], "big")
offset+=4
largeElementType = int.from_bytes(encodedData[offset:offset+2], "little")
offset+=2
curElemSize = largeElementSize
curElemType = largeElementType
offsetInit = offset
if curElemType == 1:
offset+=4
elif curElemType == 2:
offset+=2
elif curElemType == 3:
offset+=20
elif curElemType == 4:
offset+=28
elif curElemType == 5:
offset+=12
elif curElemType == 6:
textLength = curElemSize - 3
offset+=6+(textLength*2)
elif curElemType == 7:
numPoint = int(curElemSize / 2)
offset+=4*numPoint
elif curElemType == 27:
numPoint = int(curElemSize / 4)
offset+=8*numPoint
elif curElemType == 8:
numPoint = int(curElemSize / 2)
offset+=4*numPoint
elif curElemType == 28:
numPoint = int(curElemSize / 4)
offset+=8*numPoint
elif curElemType == 13:
offset+=4
elif curElemType == 14:
offset+=2
elif curElemType == 15:
offset+=2
elif curElemType == 100:
pass
elif curElemType == 101:
offset+=20
elif curElemType == 102:
offset+=2
elif curElemType == 103:
pass
elif curElemType == 104:
offset+=6
elif curElemType == 105:
pass
elif curElemType == 109:
textLength = curElemSize - 1
offset+=2+(textLength*2)
elif curElemType == 111:
offset+=40
elif curElemType == 112:
offset+=52
elif curElemType == 113:
offset+=24
elif curElemType == 256:
nameLength = int.from_bytes(encodedData[offset+14:offset+16], "little")
objects.append({
"type": "LargePolygon",
"name": encodedData[offset+16:offset+16+nameLength].decode("utf-8").replace('\x00',''),
"entity": int.from_bytes(encodedData[offset:offset+2], "little"),
"occurence": int.from_bytes(encodedData[offset+2:offset+6], "little"),
"line_color_green": encodedData[offset + 8],
"line_color_red": encodedData[offset + 7],
"line_color_blue": encodedData[offset + 9],
"fill_color_green": encodedData[offset + 10],
"fill_color_red": encodedData[offset + 11],
"fill_color_blue": encodedData[offset + 13]
})
if nameLength > 0:
offset+= 16 + nameLength
if encodedData[offset] == 0:
offset+=1
else:
offset+= 16
numberOfPoints = int.from_bytes(encodedData[offset:offset+2], "little")
offset+=2
offset+=numberOfPoints*8
elif curElemType == 257:
pass
else:
offset+= curElemSize*2
return objects
# 4) decode custom format
objects = decodeWtb(r.content)
# 5) get the selected area
selectedZone = [
t
for t in objects
if t.get("fill_color_green", 255) < 255 and t.get("line_color_red") == 255
][0]
print(selectedZone)
# 6) get the info about item
r = s.get(f'https://alta.registries.gov.ab.ca/SpinII/popupTitleSearch.aspx?title={selectedZone["occurence"]}')
df = pd.read_html(r.content, attrs = {'class': 'bodyText'}, header =0)[0]
del df['Add to Cart']
del df['View']
print(df[:-1])
输出
Title Number Type LINC Number Short Legal Rights Registration Date Change/Cancel Date
0 052400228 Current Title 0030278592 0420091;16 Surface 19/09/2005 13/11/2019
1 072294084 Current Title 0030278551 0420091;12 Surface 22/05/2007 21/08/2007
2 072400529 Current Title 0030278469 0420091;3 Surface 05/07/2007 28/08/2007
3 072498228 Current Title 0030278501 0420091;7 Surface 18/08/2007 08/02/2008
4 072508699 Current Title 0030278535 0420091;10 Surface 23/08/2007 13/12/2007
5 072559500 Current Title 0030278477 0420091;4 Surface 17/09/2007 19/11/2007
6 072559508 Current Title 0030278576 0420091;14 Surface 17/09/2007 09/01/2009
7 072559521 Current Title 0030278519 0420091;8 Surface 17/09/2007 07/11/2007
8 072559530 Current Title 0030278493 0420091;6 Surface 17/09/2007 25/08/2008
9 072559605 Current Title 0030278485 0420091;5 Surface 17/09/2007 23/12/2008
objects
如果您想获得更多条目,可以查看该字段。如果您想获得有关坐标等项目的更多信息,您可以改进解码器......
也可以通过查看name
包含 lincNumber 的字段来匹配位于目标周围的其他 lincNumber,除非其中有“多个”名称。
有趣的事实 :
此流程中无需设置 http 标头
推荐阅读
- android - 如何解决我的应用在 Google Play 控制台上的拒绝问题
- laravel - Laravel AJAX 通过 API Controller / Passport 请求
- angular - 区分ngFor中同名的viewChild
- scala - 点燃从 HDFS 读取的 CONFIG
- c# - Unity 视频播放器无法在我的 android 上运行
- appium - 无法在 Appium + Robot Framework 中使用 Xpath,其中 Appium 将其显示的错误消息记录为 contextId: 'multiple: true'
- user-permissions - Mojave 命令行工具的摄像头和麦克风权限
- ruby-on-rails - 如何从 link_to 帖子中调用控制器中的邮件操作
- html - 使用 Flexbox 将元素向右移动
- python - I need to get news article data. I'm using request/get from python but I got this error: 403 forbidden