API referenceText

pdfSetTextUnderlineColor

Set the underline stroke color as device RGB.

CategoryText decoration

Purpose — Set the underline stroke color as device RGB.

Description — Switches the underline's color mode to RGB (mode 0), overriding any previous CMYK or Separation color set via the sibling calls below — the three color-setting calls are mutually exclusive, last-write-wins on the mode.

Declarations

C
int32_t __stdcall pdfSetTextUnderlineColor(PPDF IPDF, double Red, double Green, double Blue);
Delphi
function pdfSetTextUnderlineColor(const IPDF: PPDF; Red, Green, Blue: Double): Integer; stdcall; external 'LumasPdf.dll';

Parameters

ParameterTypeDescription
IPDFPPDFInstance handle.
Red, Green, BlueDouble0.0..1.0 device RGB components.

Return value1 on a valid handle; 0 on an invalid handle.

See alsopdfSetTextUnderlineColorCMYK, pdfSetTextUnderlineColorSep

C# (P/Invoke)

wrappers/dotnet/LumasPdf.cs
public static extern int pdfSetTextUnderlineColor(IntPtr IPDF, double Red, double Green, double Blue);
Area
Text
Category

Setters

Exported names

pdfSetTextUnderlineColor

String variants

The …A form takes UTF-8, …W takes UTF-16; a bare name aliases the ANSI form.

See working code

Worked examples — complete programs in ten languages.