Reference Manual - 1.0.1
IDirectFBDataBuffer   HasData

Check if there is data available.
检测数据是否有效

HasData (
  IDirectFBDataBuffer   * thiz
);

This method returns DFB_OK if there is data available, DFB_BUFFER_EMPTY otherwise.
如果数据有效，返回DFB_OK，否则返回DFB_BUFFER_EMPTY

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