def lastpos(findstr,mystr):

#gp.AddMessage("查询=======:"+findstr+","+mystr)

num=len(mystr)

#gp.AddMessage("长度:"+str(num))

findnum=len(findstr)

#gp.AddMessage("长度，findnum="+str(findnum))

i=num-findnum

#gp.AddMessage("查询:i="+str(i)+",num="+str(num))

while i>0:

p=mystr.find(findstr,i,num)

#gp.AddMessage("查询:p="+str(p))

if p>0:

return p

i=i-1

def gettfh(filename): #获得图幅号

filepath=os.path.dirname(filename)

#gp.AddMessage("查询:p="+filepath)

p=lastpos("\\",filepath)

num=len(filepath);

return filepath[p+1:num]