* Lazarus/FPC Version: Lazarus 2.2.4 (rev lazarus_2_2_4) FPC 3.2.2 x86_64-win64-win32/win64 * Operating System: Windows * CPU / Bitness: 64 Bit ## What happens When compiling for Target WIN64, CPU CPU64, but using jwawindows SizeOf(DHCPCAPI_PARAMS)=24 SizeOf(DHCPCAPI_PARAMS_ARRAY)=12 which is NOT correct (the results should be 32 and 16) ## What did you expect When compiling for Target WIN64, CPU CPU64, using jwadhcpcsdk I get: SizeOf(DHCPCAPI_PARAMS)=32 SizeOf(DHCPCAPI_PARAMS_ARRAY)=16 That is the correct size - which also should be the result, when i use jwawindows It seemes, that the use of jwawindows somehow changes the structure of the record in jwadhcpcsdk to a packed record. I have tried to insert {$PACKRECORDS C} before the definition af the record i jwadhcpcsdk and recompile Jedi. In that case it works with the unit jwawindows, but I have no idea, if this wil cause any unwanted sideeffects. BTW, with Target WIN32, CPU CPU32 i get the same correct result with both jwawindows and jwadhcpcsdk: ``` SizeOf(DHCPCAPI_PARAMS)=20 SizeOf(DHCPCAPI_PARAMS_ARRAY)=8 ``` ## Steps to reproduce ``` program Project1; uses JwaWindows,SysUtils; var SendParams: DHCPCAPI_PARAMS_ARRAY; optionparam: DHCPCAPI_PARAMS; begin WriteLn(Format('SizeOf DHCPCAPI_PARAMS: %D', [SizeOf(DHCPCAPI_PARAMS)])); WriteLn(Format('SizeOf DHCPCAPI_PARAMS_ARRAY: %D', [SizeOf(DHCPCAPI_PARAMS_ARRAY)])); readln; end. ``` Compile and run in 64bit windows - the output is: ``` SizeOf DHCPCAPI_PARAMS: 24 SizeOf DHCPCAPI_PARAMS_ARRAY: 12 ``` Change `uses JwaWindows,SysUtils;` to `uses jwadhcpcsdk,SysUtils`; and add C:\lazarus\fpc\3.2.2\source\packages\winunits-jedi\src to the projects unit search path. compile and run gives the correct output : outputs: ``` SizeOf DHCPCAPI_PARAMS: 32 SizeOf DHCPCAPI_PARAMS_ARRAY: 16 ```