@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: The SetFilePointer API !!!!C# Signature: public enum EMoveMethod : uint { Begin = 0, Current = 1, End = 2 } [DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] static extern unsafe uint SetFilePointer( [In] SafeFileHandle hFile, [In] int lDistanceToMove, [Out] int* lpDistanceToMoveHigh, [In] EMoveMethod dwMoveMethod); [DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] static extern uint SetFilePointer( [In] SafeFileHandle hFile, [In] int lDistanceToMove, [Out] out int lpDistanceToMoveHigh, [In] EMoveMethod dwMoveMethod); !!!!User-Defined Types: None. !!!!VB Signature: Public Enum EMoveMethod As System.UInt32 FILE_BEGIN = 0 FILE_CURRENT = 1 FILE_END = 2 End Enum <DllImport("kernel32.dll", SetLastError:=True)> _ Shared Function SetFilePointer( _ ByVal hFile As IntPtr, _ ByVal lDistanceToMove As Integer, _ ByRef lpDistanceToMoveHigh As IntPtr, _ ByVal dwMoveMethod As EMoveMethod) _ As System.UInt32 End Function Public Const INVALID_SET_FILE_POINTER As Integer = -1 !!!!Notes: If you are using this function to access hard-disk sectors greater than (2^32 - 2) bytes, then the third argument will not be null or IntPtr.Zero. So when you pass an IntPtr to the third argument, pass it as a reference. To do this, just change the third argument signature to: ref IntPtr lpDistanceToMoveHigh. None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: [DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)] private static extern int SetFilePointer(IntPtr handle, int lDistanceToMove, out int lpDistanceToMoveHigh, uint dwMoveMethod); public long Seek(IntPtr handle, long offset, SeekOrigin origin) { uint moveMethod = 0; switch (origin) { case SeekOrigin.Begin: moveMethod = 0; break; case SeekOrigin.Current: moveMethod = 1; break; case SeekOrigin.End: moveMethod = 2; break; } int lo = (int)(offset & 0xffffffff); int hi = (int)(offset >> 32); lo = SetFilePointer(handle, lo, out hi, moveMethod); if (lo == -1) { if (GetLastError() != 0) { throw new Exception("INVALID_SET_FILE_POINTER"); } } return (((long)hi << 32) | (uint)lo); } !!!!Alternative Managed API: Do you know one? Please contribute it! Documentation: SetFilePointer@msdn on MSDN
Edit kernel32.setfilep...
You do not have permission to change this page. If you feel this is in error, please send feedback with the contact link on the main page.