RE: Addendum: [BLACKBOX] A question about huge files

From: null <">
Date: Wed, 12 Jun 2013 13:04:02 +0000

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Richard,

> A quick glance at WinAPI interface does not show a SetFilePointerEx function. 

yes, I know.

> Would it be sufficient to copy SetFilePointer and rename it to SetFilePointerEx?

no, it has a different (LARGE_INTEGER instead of LONG) parameters (in & out).
 
signatures according to MSDN are:

DWORD WINAPI SetFilePointer(
_In_ HANDLE hFile,
_In_ LONG lDistanceToMove,
_Inout_opt_ PLONG lpDistanceToMoveHigh,
_In_ DWORD dwMoveMethod
);

and

BOOL WINAPI SetFilePointerEx(
_In_ HANDLE hFile,
_In_ LARGE_INTEGER liDistanceToMove,
_Out_opt_ PLARGE_INTEGER lpNewFilePointer,
_In_ DWORD dwMoveMethod
);

So I guess it should be:

PROCEDURE SetFilePointer* (hFile: HANDLE; lDistanceToMove: INTEGER;
                           VAR [nil] lpDistanceToMoveHigh: INTEGER;
                           dwMoveMethod: INTEGER): INTEGER;

and

PROCEDURE SetFilePointerEx* (hFile: HANDLE; lDistanceToMove: LONGINT;
                           VAR [nil] lpDistanceToMoveHigh: LONGINT;
                           dwMoveMethod: INTEGER): INTEGER;

beware, there might be more procedure, which might need adjustment.

--
  Bernhard
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Received on Wed Jun 12 2013 - 15:04:02 UTC