Reference Manual - 1.8.0
IDirectFBDataBuffer   GetData

Fetch data from a streaming or static buffer.

DFBResult GetData (
  IDirectFBDataBuffer   * thiz,
  unsigned int   length,
  void   * ret_data,
  unsigned int   * ret_read

Static buffers will increase the data pointer. Streaming buffers will flush the data portion.

The maximum number of bytes to fetch is specified by "length", the actual number of bytes fetched is returned via "read".

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