NSIS: How to change RichEdit background color - installation

Question

I'm using Nsis for install my project. I need to change richEdit background color. I try SetCtlColors method but it doesn't make any changes. Here is my code:
; handle variables
Var hCtl_FirstDialog
Var hCtl_FirstDialog_RichText1
Var hCtl_FirstDialog_Button1
; dialog create function
Function fnc_FirstDialog_Create
; === FirstDialog (type: Dialog) ===
nsDialogs::Create 1018
Pop $hCtl_FirstDialog
${If} $hCtl_FirstDialog == error
Abort
${EndIf}
!insertmacro MUI_HEADER_TEXT "Dialog title..." "Dialog subtitle..."
; === RichText1 (type: RichText) ===
nsDialogs::CreateControl /NOUNLOAD "RichEdit20A" ${WS_VISIBLE}|${WS_CHILD}|${WS_TABSTOP}|${WS_VSCROLL}|${ES_MULTILINE}|${ES_WANTRETURN} ${WS_EX_STATICEDGE} 12.51u 14.77u 261.32u 92.92u ""
Pop $hCtl_FirstDialog_RichText1
; RichText1 ControlCustomScript
nsRichEdit::Load $hCtl_FirstDialog_RichText1 D:\temp\NsisProject\EULA.rtf
SetCtlColors $hCtl_FirstDialog_RichText1 ccff00 ccff00
; === Button1 (type: Button) ===
${NSD_CreateButton} 225.11u 118.77u 49.37u 14.15u "Button1"
Pop $hCtl_FirstDialog_Button1
${NSD_OnClick} $hCtl_FirstDialog_Button1 FillText
FunctionEnd
; dialog show function
Function fnc_FirstDialog_Show
Call fnc_FirstDialog_Create
nsDialogs::Show
FunctionEnd

Answer 1

The richedit control does not support SetCtlColors, you must use its documented messages to set the text format:
!include nsDialogs.nsh
!include WinMessages.nsh
!define /ifndef /math EM_SETBKGNDCOLOR ${WM_USER} + 67
!define /ifndef /math EM_SETCHARFORMAT ${WM_USER} + 68
!define /ifndef /math EM_SETTEXTEX ${WM_USER} + 97
!define /ifndef ST_SELECTION 2
!define /ifndef CFM_COLOR 0x40000000
!define /ifndef SCF_DEFAULT 0x0000
!define /ifndef SCF_ALL 0x0004
Var hRichEd
Function MyPageCreate
nsDialogs::Create 1018
Pop $0
nsDialogs::CreateControl /NOUNLOAD "RichEdit20A" ${WS_VISIBLE}|${WS_CHILD}|${WS_TABSTOP}|${WS_VSCROLL}|${ES_MULTILINE}|${ES_WANTRETURN} ${WS_EX_STATICEDGE} 12.51u 14.77u 261.32u 92.92u ""
Pop $hRichEd
SendMessage $hRichEd ${EM_SETBKGNDCOLOR} 0 0x00ffcc
!if 1 ; Set default
System::Call '*(i 60, i ${CFM_COLOR}, i0,i0,i0, i 0xcc00ff, i, &m32)p.r0' ; Note: 60 is the ANSI size
SendMessage $hRichEd ${EM_SETCHARFORMAT} ${SCF_ALL} $0
System::Free $0
${nsD_SetText} $hRichEd "Text goes here"
!else ; Import RTF
System::Call '*(i${ST_SELECTION},i0)p.r0'
SendMessage $hRichEd ${EM_SETTEXTEX} $0 "STR:{\rtf1\ansi\deff0{\colortbl;\red115\green0\blue25;}\cf1 Text goes here}" ; www.pindari.com/rtf1.html
System::Free $0
SendMessage $hRichEd ${EM_REPLACESEL} 0 "STR: and more text here"
!endif
nsDialogs::Show
FunctionEnd
Page Custom MyPageCreate