In Nsis, I'm using:
...
nsDialogs::Create 1018
Pop $0
nsDialogs::Show
...
But the size of the dialog box doesn't fit my needs. How can I specify a length for x and y to this dialog ?
If you want to resize everything it is probably better to use Resource Hacker and ChangeUI
but you can do it at runtime:
!include nsDialogs.nsh
Function mypage
System::Call 'user32::SetWindowPos(i$hwndparent,i,i,i,i 640,i 480,i 0x16)' ; Resize outer dialog
nsDialogs::Create 1018
Pop $0
System::Call 'user32::MoveWindow(i$0,i0,i0,i 600,i 200,i0)' ; Resize inner (nsDialogs) page
${NSD_CreateLabel} 0 10u 100% 10u "Hello, welcome to nsDialogs!"
Pop $0
SetCtlColors $0 0xffffff 0xff2255
nsDialogs::Show
FunctionEnd
page custom mypage