Reference Manual - 1.0.1
IDirectFBDataBuffer   GetPosition

Get the current byte position within a static buffer.
取得静态缓冲内当前位置

GetPosition (
	IDirectFBDataBuffer		*	thiz,
	unsigned int		*	ret_offset
);

This method only applies to static buffers.
这个方法只应用在静态缓冲

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