`pdfCreateViewport`

int32_t __stdcall pdfCreateViewportA(PPDF IPDF, const char* Name, double X1, double Y1, double X2, double Y2);
int32_t __stdcall pdfCreateViewportW(PPDF IPDF, const wchar_t* Name, double X1, double Y1, double X2, double Y2);

Delphi

function pdfCreateViewportA(const IPDF: PPDF; const Name: PAnsiChar; X1, Y1, X2, Y2: Double): Integer; stdcall;
function pdfCreateViewportW(const IPDF: PPDF; const Name: PWideChar; X1, Y1, X2, Y2: Double): Integer; stdcall;

Purpose. Register a new /Viewport entry (a named rectangular sub-region of the current page) — the prerequisite object that pdfCreateRectilinearMeasure/pdfCreateGeospatialMeasure attach a /Measure dictionary to.

Parameters.

Parameter	Description
`IPDF`	Document handle.
`Name`	The viewport's `/Name` label.
`X1,Y1,X2,Y2`	The viewport's rectangle on the current page.

Return value. The new viewport's 1-based index on the current page; 0 if there is no current page.

See also. pdfCreateRectilinearMeasure.

C# (P/Invoke)

wrappers/dotnet/LumasPdf.cs

public static extern int pdfCreateViewportA(IntPtr IPDF, [MarshalAs(UnmanagedType.LPStr)] string Name, double X1, double Y1, double X2, double Y2);
public static extern int pdfCreateViewportW(IntPtr IPDF, [MarshalAs(UnmanagedType.LPWStr)] string Name, double X1, double Y1, double X2, double Y2);

Area

Core SDK