Re: difference between

[Bruce Steers <bsteers4@xxxxxxxxx>]

On Sat, 10 Oct 2026 at 16:25, valaquarus <valaquarus@xxxxxxxxx> wrote:

> Le samedi 10 octobre 2026 à 15:36 +0300, Jussi Lahtinen a écrit :
>
> But this is much better:
> If IsNull(PictureBoxQRCode.Image) = False Then
>
>
> Jussi
>
>
> On Sat, Oct 10, 2026 at 3:33 PM Jussi Lahtinen <jussi.lahtinen@xxxxxxxxx>
> wrote:
>
> Avoid extra "Not", it makes reading the code confusing.
> You can fix it this way:
>
> If Not (PictureBoxQRCode.Image = Null) Then.
>
>
> Jussi
>
>
> On Sat, Oct 10, 2026 at 9:43 AM valaquarus <valaquarus@xxxxxxxxx> wrote:
>
> Hello,
> what are the differences between these two assertions, because they don't
> act exactly the same way :
>
> - If Not PictureBoxQRCode.Image = Null Then...
> - If Not IsNull(PictureBoxQRCode.Image) Then...
>
>
> [System]
> Gambas=3.22.99 2992226 (master)
> OperatingSystem=Linux
> Distribution=Manjaro Linux
> Kernel=7.2.3-2-MANJARO
> Architecture=x86_64
> Cores=4
> Memory=5713M
> Language=fr_FR.UTF-8
> Platform=x11
> Desktop=KDE
> DesktopResolution=96
> DesktopScale=9
> WidgetTheme=breeze
> Font=Adwaita Mono,12
> DarkTheme=False
> [Programs]
> appimage-builder=appimage-builder: 1.1.1.dev32+g2709a3b
> clang=clang version 22.1.8
> dpkg=Programme « dpkg » de gestion de paquets Debian version 1.23.7-dirty
> (amd64).
> gcc=gcc (GCC) 16.2.1 20260810
> git=git version 2.55.0
> msgmerge=msgmerge (GNU gettext-tools) 1.0
> pngquant=3.0.3
> rpmbuild=RPM version 6.0.1
> trans=Translate Shell 0.9.7.1-git:dc67af4
> [Libraries]
> Cairo=libcairo.so.2.11804.4
> Curl=libcurl.so.4.8.0
> DBus=libdbus-1.so.3.38.3
> GDK2=libgdk-x11-2.0.so.0.2400.33
> GDK3=libgdk-3.so.0.2420.32
> GStreamer=libgstreamer-1.0.so.0.2806.0
> GTK+2=libgtk-x11-2.0.so.0.2400.33
> GTK+3=libgtk-3.so.0.2420.32
> OpenGL=libGL.so.1.7.0
> Poppler=libpoppler.so.163.0.0
> QT5=libQt5Core.so.5.15.19
> QT6=libQt6Core.so.6.11.2
> RSvg=librsvg-2.so.2.62.3
> SDL=libSDL2-2.0.so.0.3200.72
> SQLite3=libsqlite3.so.3.53.4
> [Environment]
> DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
> DEBUGINFOD_URLS=https://debuginfod.archlinux.org
> DESKTOP_SESSION=/usr/share/xsessions/plasmax11.desktop
> DISPLAY=:0
> DOCKER_HOST=unix:///run/user/1000/podman/podman.sock
> GB_GUI=gb.gtk3
> GTK2_RC_FILES=/etc/gtk-2.0/gtkrc:<home>/.gtkrc-2.0:<home>/.config/gtkrc-2.0
> GTK_MODULES=canberra-gtk-module
> GTK_RC_FILES=/etc/gtk/gtkrc:<home>/.gtkrc:<home>/.config/gtkrc
> HOME=<home>
> ICEAUTHORITY=/run/user/1000/iceauth_IlqFFb
> INVOCATION_ID=41b15739ce1c46eb9a1566475fbf9362
> JOURNAL_STREAM=10:13404
> KDE_APPLICATIONS_AS_SCOPE=1
> KDE_FULL_SESSION=true
> KDE_SESSION_UID=1000
> KDE_SESSION_VERSION=6
> LANG=fr_FR.UTF-8
> LANGUAGE=fr_FR.UTF-8
> LOGNAME=<user>
> MAIL=/var/spool/mail/<user>
> MANAGERPID=826
> MANAGERPIDFDID=8436
>
> MEMORY_PRESSURE_WATCH=/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service
> /session.slice/plasma-plasmashell.service/memory.pressure
> MEMORY_PRESSURE_WRITE=c29tZSAyMDAwMDAgMjAwMDAwMAA=
> MOTD_SHOWN=pam
> OLDPWD=<home>
> PAM_KWALLET5_LOGIN=/run/user/1000/kwallet5.socket
>
> PATH=<home>/.local/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/var/lib/flatpak/exports/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/usr/lib/rustup/bin
> PWD=<home>
> QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
> QT_LOGGING_RULES=*.debug=false
> QT_QPA_PLATFORM=xcb
>
> QT_SCREEN_SCALE_FACTORS=LVDS-1=1;VGA-1=1;HDMI-1=1;DP-1=1;HDMI-2=1;HDMI-3=1;DP-2=1;DP-3=1;
> QT_WAYLAND_RECONNECT=1
>
> SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/969,unix/<hostname>:/tmp/.ICE-unix/969
> SHELL=/usr/bin/zsh
> SYSTEMD_EXEC_PID=981
> TZ=:/etc/localtime
> USER=<user>
> VSSCRIPT_PATH=/usr/lib/python3.14/site-packages/vapoursynth/libvsscript.so
> XAUTHORITY=/run/user/1000/xauth_cjAxZJ
>
> XDG_CONFIG_DIRS=<home>/.config/kdedefaults:/etc/xdg:/usr/share/manjaro-kde-settings/xdg
> XDG_CURRENT_DESKTOP=KDE
>
> XDG_DATA_DIRS=<home>/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
> XDG_MENU_PREFIX=plasma-
> XDG_RUNTIME_DIR=/run/user/1000
> XDG_SEAT=seat0
> XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
> XDG_SESSION_CLASS=user
> XDG_SESSION_DESKTOP=KDE
> XDG_SESSION_ID=2
> XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session1
> XDG_SESSION_TYPE=x11
> XDG_VTNR=2
>
>
> Good day to all of you
>
>
> I finally used the suggestion of Jussi
> If IsNull(PictureBoxQRCode.Image) = False Then
> that is more explicit (for me)
>
> Thank you all
>
>
>