Android monkeyrunner的takeSnapshot（）错误

我正在测试monkeyrunner，并使用下面的.py文件进行截屏

屏幕捕获图像已生成，但有时在“result=device.takeSnapshot（）中出现错误”

我不知道有什么问题。 我已经用Eclipse对它进行了测试。（Eclipse->AVD，皮肤WVGA854）

请帮帮我~谢谢~

    # Imports the monkeyrunner modules used by this program
    from com.android.monkeyrunner import MonkeyRunner, MonkeyDevice, MonkeyImage

    # Connects to the current device, returning a MonkeyDevice object
    device = MonkeyRunner.waitForConnection()

    # Installs the Android package. Notice that this method returns a boolean, so you can test
    # to see if the installation worked.
    #device.installPackage('D:\\study_java\\monkeyrunner\\HelloAndroid.apk')

    # sets a variable with the package's internal name
    package = 'com.example.helloandroid'

    # sets a variable with the name of an Activity in the package
    activity = 'com.example.helloandroid.HelloAndroid'

    # sets the name of the component to start
    runComponent = package + '/' + activity

    # Runs the component
    device.startActivity(component=runComponent)

    # Takes a screenshot
    MonkeyRunner.sleep(0.5)
    result = device.takeSnapshot()
    # Writes the screenshot to a file
    result.writeToFile('D:\\study_java\\monkeyrunner\\screen_shot.png','png')

下面是错误日志

    D:\study_java\monkeyrunner>monkeyrunner d:\study_java\monkeyrunner\monkeytest.py

    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice] Unab
    le to take snapshot
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]java.
    io.IOException: EOF
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.ddmlib.AdbHelper.read(AdbHelper.java:643)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.ddmlib.AdbHelper.read(AdbHelper.java:616)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.ddmlib.AdbHelper.getFrameBuffer(AdbHelper.java:326)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.ddmlib.Device.getScreenshot(Device.java:270)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.monkeyrunner.adb.AdbMonkeyDevice.takeSnapshot(AdbMonkeyDevice.jav
    a:197)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.monkeyrunner.MonkeyDevice.takeSnapshot(MonkeyDevice.java:83)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at java.lang.reflect.Method.invoke(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:175)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyObject.__call__(PyObject.java:355)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyMethod.__call__(PyMethod.java:215)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:221)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyMethod.__call__(PyMethod.java:206)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyObject.__call__(PyObject.java:381)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyObject.__call__(PyObject.java:385)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.pycode._pyx0.f$0(d:\study_java\monkeyrunner\monkeytest.py:37)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.pycode._pyx0.call_function(d:\study_java\monkeyrunner\monkeytest.p
    y)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyTableCode.call(PyTableCode.java:165)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.PyCode.call(PyCode.java:18)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.Py.runCode(Py.java:1197)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.core.__builtin__.execfile_flags(__builtin__.java:538)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at org.python.util.PythonInterpreter.execfile(PythonInterpreter.java:156)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.monkeyrunner.ScriptRunner.run(ScriptRunner.java:116)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.monkeyrunner.MonkeyRunnerStarter.run(MonkeyRunnerStarter.java:93)

    111019 16:47:17.000:S [main] [com.android.monkeyrunner.adb.AdbMonkeyDevice]
    at com.android.monkeyrunner.MonkeyRunnerStarter.main(MonkeyRunnerStarter.java:20
    3)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions] Scri
    pt terminated due to an exception
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]Trace
    back (most recent call last):
      File "d:\study_java\monkeyrunner\monkeytest.py", line 27, in <module>
        result.writeToFile('D:\\study_java\\monkeyrunner\\screen_shot.png','png')
            at com.android.monkeyrunner.MonkeyImage.writeToFile(MonkeyImage.java:85)

            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
            at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
            at java.lang.reflect.Method.invoke(Unknown Source)

    java.lang.NullPointerException: java.lang.NullPointerException

    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyException.fillInStackTrace(PyException.java:70)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at java.lang.Throwable.<init>(Throwable.java:181)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at java.lang.Exception.<init>(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at java.lang.RuntimeException.<init>(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyException.<init>(PyException.java:46)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyException.<init>(PyException.java:43)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.Py.JavaError(Py.java:455)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.Py.JavaError(Py.java:448)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:177)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyObject.__call__(PyObject.java:355)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyMethod.__call__(PyMethod.java:215)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:221)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyMethod.__call__(PyMethod.java:206)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyObject.__call__(PyObject.java:414)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyObject.__call__(PyObject.java:418)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.pycode._pyx0.f$0(d:\study_java\monkeyrunner\monkeytest.py:37)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.pycode._pyx0.call_function(d:\study_java\monkeyrunner\monkeytest.p
    y)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyTableCode.call(PyTableCode.java:165)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyCode.call(PyCode.java:18)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.Py.runCode(Py.java:1197)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.__builtin__.execfile_flags(__builtin__.java:538)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.util.PythonInterpreter.execfile(PythonInterpreter.java:156)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at com.android.monkeyrunner.ScriptRunner.run(ScriptRunner.java:116)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at com.android.monkeyrunner.MonkeyRunnerStarter.run(MonkeyRunnerStarter.java:93)

    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at com.android.monkeyrunner.MonkeyRunnerStarter.main(MonkeyRunnerStarter.java:20
    3)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]Cause
    d by: java.lang.NullPointerException
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at com.android.monkeyrunner.MonkeyImage.writeToFile(MonkeyImage.java:85)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at java.lang.reflect.Method.invoke(Unknown Source)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:175)
    111019 16:47:17.000:S [main] [com.android.monkeyrunner.MonkeyRunnerOptions]
    ... 16 more

    D:\study_java\monkeyrunner>

D:\study\u java\monkeyrunner>monkeyrunner D:\study\u java\monkeyrunner\monkeytest.py
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]Unab
拍摄快照
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]java。
io.IOException:EOF
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于com.android.ddmlib.AdbHelper.read（AdbHelper.java:643）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于com.android.ddmlib.AdbHelper.read（AdbHelper.java:616）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于com.android.ddmlib.AdbHelper.getFrameBuffer（AdbHelper.java:326）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于com.android.ddmlib.Device.getScreenshot（Device.java:270）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在com.android.monkeyrunner.adb.AdbMonkeyDevice.takeSnapshot（AdbMonkeyDevice.jav）上
a:197）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在com.android.monkeyrunner.monkeyedevice.takeSnapshot（monkeyedevice.java:83）上
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于sun.reflect.NativeMethodAccessorImpl.invoke（未知源）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在sun.reflect.DelegatingMethodAccessorImpl.invoke处（未知源）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于java.lang.reflect.Method.invoke（未知源）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.PyReflectedFunction.\uuu调用（PyReflectedFunction.java:175）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.PyObject.\uu调用（PyObject.java:355）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.PyMethod.\uuuu调用（PyMethod.java:215）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.PyMethod.instancemethod\uuuuu调用（PyMethod.java:221）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.PyMethod.\uuu调用（PyMethod.java:206）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.PyObject._调用（PyObject.java:381）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.PyObject._调用（PyObject.java:385）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于org.python.pycode.\u pyx0.f$0（d:\study\u java\monkeyrunner\monkeytest.py:37）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.pycode.\u pyx0.call\u函数（d:\study\u java\monkeyrunner\monkeytest.p
y）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于org.python.core.PyTableCode.call（PyTableCode.java:165）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于org.python.core.PyCode.call（PyCode.java:18）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于org.python.core.Py.runCode（Py.java:1197）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在org.python.core.\uuuuuu内置文件\uuuuuuuuuuuuuuu.execfile\u标志（\uuuuuuuuu内置文件\uuuuuuuu.java:538）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于org.python.util.PythonInterpreter.execfile（PythonInterpreter.java:156）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于com.android.monkeyrunner.ScriptRunner.run（ScriptRunner.java:116）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
在com.android.monkeyrunner.MonkeyRunnerStarter.run（MonkeyRunnerStarter.java:93）
111019 16:47:17.000:S[main][com.android.monkeyrunner.adb.AdbMonkeyDevice]
位于com.android.monkeyrunner.monkeyrunner.starter.main（monkeyrunner.java:20
3)
111019 16:47:17.000:S[main][com.android.monkeyrunner.monkeyrunner选项]Scri
pt因异常而终止
111019 16:47:17.000:S[main][com.android.monkeyrunner.monkeyrunner选项]跟踪
返回（最近一次呼叫最后一次）：
文件“d:\study\u java\monkeyrunner\monkeytest.py”，第27行，在
result.writeToFile（'D:\\study\u java\\monkeyrunner\\screen\u shot.png'，'png'）
位于com.android.monkeyrunner.MonkeyImage.writeToFile（MonkeyImage.java:85）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
位于sun.reflect.NativeMethodAccessorImpl.invoke（未知源）
在sun.reflect.DelegatingMethodAccessorImpl.invoke处（未知源）
位于java.lang.reflect.Method.invoke（未知源）
java.lang.NullPointerException:java.lang.NullPointerException
111019 16:47:17.000:S[main][com.android.monkeyrunner.monkeyrunner选项]
位于org.python.core.PyException.fillInStackTrace（PyException.java:70）
111019 16:47:17.000:S[main][com.android.monkeyrunner.monkeyrunner选项]
位于java.lang.Throwable。（Throwable.java:181）
111019 16:47:17.000:S[main][com.android.monkeyrunner.monkeyrunner选项]
位于java.lang.Exception。（未知源）
111019 16:47:17.000:S
result.writeToFile('D:\\study_java\\monkeyrunner\\screen_shot.png','png')

result.writeToFile('D:/study_java/monkeyrunner/screen_shot.png','png')