LPFN_TRANSMITFILE

type LPFN_TRANSMITFILE = function(

  hSocket: TSocket;

  hFile: THandle;

  nNumberOfBytesToWrite: DWORD;

  nNumberOfBytesPerSend: DWORD;

  lpOverlapped: POverlapped;

  lpTransmitBuffers: LPTRANSMIT_FILE_BUFFERS;

  dwReserved: DWORD

):BOOL;