Re: TestError

[CD <dessere.claude@xxxxxx>]

Thank you for your reply.

So, after rereading the documentation on error handling,

I found the following at https://gambaswiki.org/wiki/lang/error:

"The error flag is reset to FALSE when:

The RETURN instruction is executed.

A TRY instruction has been executed without any error."

Therefore, if I understand correctly, in the procedure:

Public Sub _GetRowHeight(iRow As Integer) As Integer

Try Return $cHeight[iRow]

Return _GetDefaultRowHeight()

End

the line `Try Return $cHeight[iRow]` generates an error,
but the line `Return _GetDefaultRowHeight()` does not reset the error flag to
false!

This doesn't match the documentation!

Personally, I will no longer test members of the `Error` class in the code
without first using `Try`. 
But I'm still not entirely sure how error handling works in Gambas.
Perhaps more examples and explanations would be helpful.


Le lundi 10 novembre 2025 à 18:28 +0000, Bruce Steers a écrit :
> That is not how you check for errors.
> It should be done like this after a Try...
> 
> If Error then
>   Print Error.Text
> Endif
> 
> After that Error.Text is not reset to null, it will always display the last
> error text.
> 
> So randomly checking Error.Text or Error.Value at some time in your code will
> just show the last error msg/value.
> 
> An Error is not something that always throws an exception.
> 
> Eg..
> Try File.Load(sPath)
> If Error Then
>   Print Error.Text
> Endif
> 
> Error text is filled in but there was no exception to halt the program.
> 
> So the only error in your form is how you are using Error.class
> The error you are displaying is from this code in _GridView_Rows.class
> https://gitlab.com/gambas/gambas/-/blob/master/comp/src/gb.gui.base/.src/GridView/_GridView_Rows.class?ref_type=heads
> Public Sub _GetRowHeight(iRow As Integer) As Integer
> 
> Try Return $cHeight[iRow]
> Return _GetDefaultRowHeight()
> 
> End
> 
> It attempts 
> Try Return $cHeight[iRow]
> if that fails it returns _GetDefaultRowHeight()
> 
> Respects
> BruceS
> 
> 
> On Mon, 10 Nov 2025 at 15:47, CD <dessere.claude@xxxxxx> wrote:
> > Hello,
> > 
> > I have an application with a main form
> > from which I launch another form in ShowModal mode.
> > 
> > After this form is submitted, I test the Error class which returns:
> > 
> > Print Error.Class -> (Class 0x590273648788)
> > Print Error.Code -> 6
> > Print Error.Text -> Type mismatch: wanted Integer, got Null instead
> > Print Error.Where -> [gb.gui.base]._GridView_Rows._GetRowHeight.161
> > 
> > I reproduced the issue with a Test application .
> > 
> > What about the error coming from
> > [gb.gui.base]._GridView_Rows._GetRowHeight.161 ?
> > 
> > Project attached
> > 
> > Regards
> > 
> > 
> > 
> > 
> > [System]
> > Gambas=3.21.0 7f84523 (master)
> > OperatingSystem=Linux
> > Distribution=Ubuntu 24.04.3 LTS (Noble Numbat)
> > Kernel=6.8.0-86-generic
> > Architecture=x86_64
> > Cores=8
> > Memory=7817M
> > Language=fr_FR.UTF-8
> > Platform=x11
> > Desktop=MATE
> > DesktopResolution=96
> > DesktopScale=9
> > WidgetTheme=blackmate
> > Font=Ubuntu Mono,13
> > DarkTheme=True
> > [Programs]
> > dpkg=Programme « dpkg » de gestion de paquets Debian version 1.22.6 (amd64).
> > gcc=gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
> > git=git version 2.43.0
> > msgmerge=msgmerge (GNU gettext-tools) 0.21
> > rpmbuild=RPM version 4.18.2
> > [Libraries]
> > Cairo=libcairo.so.2.11800.0
> > Curl=libcurl.so.4.8.0
> > DBus=libdbus-1.so.3.32.4
> > GDK2=libgdk-x11-2.0.so.0.2400.33
> > GDK3=libgdk-3.so.0.2409.32
> > GStreamer=libgstreamer-1.0.so.0.2402.0
> > GTK+2=libgtk-x11-2.0.so.0.2400.33
> > GTK+3=libgtk-3.so.0.2409.32
> > OpenGL=libGL.so.1.7.0
> > Poppler=libpoppler.so.134.0.0
> > Poppler=libpoppler.so.73.0.0
> > QT5=libQt5Core.so.5.15.13
> > QT6=libQt6Core.so.6.4.2
> > RSvg=librsvg-2.so.2.50.0
> > SDL=libSDL2-2.0.so.0.3000.0
> > SQLite3=libsqlite3.so.0.8.6
> > [Environment]
> > COMPIZ_CONFIG_PROFILE=mate
> > DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
> > DEBUGINFOD_URLS=https://debuginfod.ubuntu.com
> > DEFAULTS_PATH=/usr/share/gconf/mate.default.path
> > DESKTOP_SESSION=mate
> > DISPLAY=:0
> > GB_GUI=gb.gtk3
> > GDMSESSION=mate
> > GDM_LANG=fr_FR
> > GIO_LAUNCHED_DESKTOP_FILE=<home>/Bureau/gambas3.desktop
> > GIO_LAUNCHED_DESKTOP_FILE_PID=183671
> > GNOME_KEYRING_CONTROL=/run/user/1000/keyring
> > GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
> > GTK3_MODULES=xapp-gtk3-module
> > GTK_MODULES=appmenu-gtk-module:gail:atk-bridge:canberra-gtk-module
> > GTK_OVERLAY_SCROLLING=0
> > HOME=<home>
> > INSIDE_CAJA_PYTHON=
> > LANG=fr_FR.UTF-8
> > LANGUAGE=fr_FR.UTF-8
> > LC_ADDRESS=fr_FR.UTF-8
> > LC_IDENTIFICATION=fr_FR.UTF-8
> > LC_MEASUREMENT=fr_FR.UTF-8
> > LC_MONETARY=fr_FR.UTF-8
> > LC_NAME=fr_FR.UTF-8
> > LC_NUMERIC=fr_FR.UTF-8
> > LC_PAPER=fr_FR.UTF-8
> > LC_TELEPHONE=fr_FR.UTF-8
> > LC_TIME=fr_FR.UTF-8
> > LOGNAME=<user>
> > MANDATORY_PATH=/usr/share/gconf/mate.mandatory.path
> > MATE_DESKTOP_SESSION_ID=this-is-deprecated
> > PAPERSIZE=a4
> > PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
> > :/usr/local/games:/snap/bin
> > PWD=<home>
> > QT_ACCESSIBILITY=1
> > QT_FONT_DPI=96
> > QT_LOGGING_RULES=*.debug=false
> > QT_QPA_PLATFORMTHEME=gtk2
> > QT_SCALE_FACTOR=1
> > SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-
> > unix/2550,unix/<hostname>:/tmp/.ICE-unix/2550
> > SHELL=/bin/bash
> > SHLVL=0
> > SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
> > TZ=:/etc/localtime
> > UBUNTU_MENUPROXY=1
> > USER=<user>
> > XAUTHORITY=<home>/.Xauthority
> > XDG_CONFIG_DIRS=/etc/xdg/xdg-mate:/etc/xdg
> > XDG_CURRENT_DESKTOP=MATE
> > XDG_DATA_DIRS=/usr/share/mate:/usr/share/mate:/usr/share/gnome:/usr/local/sh
> > are:/usr/share:/var/lib/snapd/desktop
> > XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/<user>
> > XDG_RUNTIME_DIR=/run/user/1000
> > XDG_SEAT=seat0
> > XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
> > XDG_SESSION_CLASS=user
> > XDG_SESSION_DESKTOP=mate
> > XDG_SESSION_ID=c1
> > XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
> > XDG_SESSION_TYPE=x11
> > XDG_VTNR=7
> >