[android-developers] How to screen capture through fb0?

Dear Sir:

I use the source code from frameworks\base\cmds\screencap
to do screen capture

If using ScreenshotClient method, it is ok to get correct result
If using to open fb0, some phones will fail to get

Nexus S with Android 4.0.3 is OK
Samsung Galaxy S2 with Android 2.3.5 is OK
Galaxy Nexus S with Android 4.0.2 is failure

Do you give me some suggestion or hint for how to get right
result
by using to open fb0 for all phones?

Thank you!

BR,
Alan

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