arcgis 10 python 输出当前窗口为图片

import arcpy
mxd = arcpy.mapping.MapDocument("current")
for df in arcpy.mapping.ListDataFrames(mxd):
    df.rotation = 0
    df.scale = 24000
    arcpy.AddMessage(df.name)
    outFile ="d:\\" + df.name + ".tif"
    arcpy.AddMessage(outFile)
    arcpy.mapping.ExportToTIFF(mxd, outFile, df)
del mxd