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A pointer to a function suitable for use as a callback used to prepare chunked-encoded HTTP requests.

   BYTE** ppData,
   DWORD *pdwSize

The CAtlHttpClientT class, when its NavigateChunked function is called, requires a callback function to prepare the chunked-encoded response. This typedef defines the signature of the callback function necessary. Before the CAtlHttpClientT::NavigateChunked function is called, a pointer to a function matching the PFNATLCHUNKEDCB typedef must be provided to the CAtlHttpClientT class through the CAtlNavigateData class.

Header: atlisapi.h