Acess External SD card with NDK

I'm developing a native apk for a开发者_如何学Pythonndroid with NDK 5.

My question is, how do I access to write and read from external SD card from native code?

PS: Testing under Galaxy Tab.

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Have you tried:

fopen("/sdcard/filename.ext", "r+")

?

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Please read this answer, things are little bit complicated for Galaxy Tab