Thank you for the solution. I tried it myself using your way in the meantime, but it didn't work.
I started testing
DllCall("MSVCRT.DLL", "ptr:cdecl", "memcpy", "struct*", $tTrg, "struct*", $_lv_tSrc, "uint", DllStructGetSize($_lv_tSrc))
which was also doing the job, but I the other solution is better.
Also thank you for showing me
_WinAPI_DisplayStruct
was not aware of that solution (acutally had my one version of it).