function GetCharacterPlacementW(DC: HDC; p2: LPWSTR; p3, p4: BOOL; var p5: TGCPResults; p6: DWORD): DWORD; external 'gdi32' name 'GetCharacterPlacementW'; Why are p3 and p4 Bool? They should be both int? https://docs.microsoft.com/en-us/windows/win32/api/wingdi/nf-wingdi-getcharacterplacementw