Re: difference between

[valaquarus <valaquarus@xxxxxxxxx>]

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/sb
> > > in:/var/lib/flatpak/exports/bin:/usr/lib/jvm/default/bin:/usr/bin
> > > /site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl:/usr/lib/rustu
> > > p/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/ma
> > > njaro-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