Re: [DUG]: Sending a record to a C++ DLL

[Corey Murtagh]

----- Original Message ----- From: Phil Middlemiss Sent: Monday, November 18, 2002 3:32 PM Subject: [DUG]: Sending a record to a C++ DLL Hi all,   how do I determine which alignment to choose for a record that will be sent to a DLL compiled from C++ ? I have the source code for a test app that uses the DLL but I don't know enough of C++ to work out how to send a record to it. Here is a typical structure:   typedef struct EscCoordinateTag {  short Degree;  short Minute;  float Second; } ESC_COORDINATE, *LPESC_COORDINATE; Some structures contain other structure types also. From what I understand of structure alignment, it only pads the structure when a member would be placed somewhere that isn't an even multiple of its own size, or the alignment value whichever is smaller.  So that structure should have offsets 0, 2 and 4 for Degree, Minute and Second respectively and a size of 8 bytes.   Assuming structure alignment is 4:   struct SExample {   short foo;   int bar; };   ...will have a size of 8 bytes, with offsets of 0 and 4 for foo and bar respectively.   Hope this helps.   -- Corey Murtagh The Electric Monk "Quidquid latine dictum sit, altum viditur."