The code which disconnect safely an USB drive works randomly
Dear all,
I work on MATLAB R2023a and Windows 11 23H2.
Thanks to this post I coud do the following code which disconnect safely E:, a USB drive.
Unfortunately, sometimes it does not work, for example, when I change the plug from USB port, it needs several execution to disconnect safely the drive.
I also noticed that in the app (see below), missing run are more frequent. The code is just executed under the button Run (first callback).
The command window shows the message I expect when it works but in fact the USB drive is still visible on "My Computer". If the disconnection works, I see an error message in the command window.
Do you have an idea what can I do to solve this issue or find it origin?
Best regards,
Pierre
The code:
function EjectUSB
% Create the PowerShell command to eject the drive
powershellCommand = ‘(New-Object -comObject Shell.Application).Namespace(17).ParseName(”E:”).InvokeVerb(”Eject”)’;
% Create the command to run PowerShell from MATLAB
command = sprintf(‘powershell -Command "%s"’, powershellCommand);
% Execute the PowerShell command
[status, cmdout] = system(command);
% Display the results
if status == 0
disp([‘Lecteur USB E éjecté avec succès.’]);
else
disp(‘Échec de l”éjection du lecteur USB.’);
disp(cmdout);
end
end
%Add a diskpart list to check if E: has been removed
The app:
classdef PotVibrantUI < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
AmplitudeSlider matlab.ui.control.Slider
FrequencySlider matlab.ui.control.Slider
Amplitude0to1EditField matlab.ui.control.NumericEditField
Amplitude0to1EditFieldLabel matlab.ui.control.Label
FrequencyHzEditField matlab.ui.control.NumericEditField
FrequencyHzEditFieldLabel matlab.ui.control.Label
RunButton matlab.ui.control.Button
end
properties (Access = private)
frequency = 20; % Default frequency value
amplitude = 0.5; % Default amplitude value
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: RunButton
function RunButtonPushed(app, event)
SetupFileCreation(app.frequency)
CustomFileCreation(app.amplitude)
pause(3)
EjectUSB
pause(3)
EjectUSB
end
% Value changing function: FrequencySlider
function FrequencySliderValueChanging(app, event)
changingValue = event.Value;
app.FrequencyHzEditField.Value = changingValue;
% Update the app.frequency property
app.frequency = changingValue;
% guidata() to share variables
end
% Value changed function: FrequencyHzEditField
function FrequencyHzEditFieldValueChanged(app, event)
value = app.FrequencyHzEditField.Value;
app.FrequencySlider.Value = value;
% Update the app.frequency property
app.frequency = value;
end
% Value changing function: AmplitudeSlider
function AmplitudeSliderValueChanging(app, event)
changingValue = event.Value;
app.Amplitude0to1EditField.Value = changingValue;
% Update the app.frequency property
app.amplitude = changingValue;
% guidata() to share variables
end
% Value changed function: Amplitude0to1EditField
function Amplitude0to1EditFieldValueChanged(app, event)
value = app.Amplitude0to1EditField.Value;
app.AmplitudeSlider.Value = value;
app.amplitude = value;
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure(‘Visible’, ‘off’);
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = ‘MATLAB App’;
% Create RunButton
app.RunButton = uibutton(app.UIFigure, ‘push’);
app.RunButton.ButtonPushedFcn = createCallbackFcn(app, @RunButtonPushed, true);
app.RunButton.FontSize = 24;
app.RunButton.Position = [26 41 568 80];
app.RunButton.Text = ‘Run’;
% Create FrequencyHzEditFieldLabel
app.FrequencyHzEditFieldLabel = uilabel(app.UIFigure);
app.FrequencyHzEditFieldLabel.HorizontalAlignment = ‘right’;
app.FrequencyHzEditFieldLabel.FontSize = 24;
app.FrequencyHzEditFieldLabel.Position = [49 435 170 31];
app.FrequencyHzEditFieldLabel.Text = ‘Frequency (Hz)’;
% Create FrequencyHzEditField
app.FrequencyHzEditField = uieditfield(app.UIFigure, ‘numeric’);
app.FrequencyHzEditField.ValueChangedFcn = createCallbackFcn(app, @FrequencyHzEditFieldValueChanged, true);
app.FrequencyHzEditField.FontSize = 24;
app.FrequencyHzEditField.Position = [234 434 100 32];
app.FrequencyHzEditField.Value = 20;
% Create Amplitude0to1EditFieldLabel
app.Amplitude0to1EditFieldLabel = uilabel(app.UIFigure);
app.Amplitude0to1EditFieldLabel.HorizontalAlignment = ‘right’;
app.Amplitude0to1EditFieldLabel.FontSize = 24;
app.Amplitude0to1EditFieldLabel.Position = [38 252 195 31];
app.Amplitude0to1EditFieldLabel.Text = ‘Amplitude (0 to 1)’;
% Create Amplitude0to1EditField
app.Amplitude0to1EditField = uieditfield(app.UIFigure, ‘numeric’);
app.Amplitude0to1EditField.ValueChangedFcn = createCallbackFcn(app, @Amplitude0to1EditFieldValueChanged, true);
app.Amplitude0to1EditField.FontSize = 24;
app.Amplitude0to1EditField.Position = [248 251 100 32];
app.Amplitude0to1EditField.Value = 0.5;
% Create FrequencySlider
app.FrequencySlider = uislider(app.UIFigure);
app.FrequencySlider.Limits = [10 40];
app.FrequencySlider.ValueChangingFcn = createCallbackFcn(app, @FrequencySliderValueChanging, true);
app.FrequencySlider.FontSize = 24;
app.FrequencySlider.Position = [26 418 473 3];
app.FrequencySlider.Value = 20;
% Create AmplitudeSlider
app.AmplitudeSlider = uislider(app.UIFigure);
app.AmplitudeSlider.Limits = [0 1];
app.AmplitudeSlider.MajorTicks = [0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1];
app.AmplitudeSlider.ValueChangingFcn = createCallbackFcn(app, @AmplitudeSliderValueChanging, true);
app.AmplitudeSlider.FontSize = 18;
app.AmplitudeSlider.Position = [20 207 479 3];
app.AmplitudeSlider.Value = 0.5;
% Show the figure after all components are created
app.UIFigure.Visible = ‘on’;
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = PotVibrantUI
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
endDear all,
I work on MATLAB R2023a and Windows 11 23H2.
Thanks to this post I coud do the following code which disconnect safely E:, a USB drive.
Unfortunately, sometimes it does not work, for example, when I change the plug from USB port, it needs several execution to disconnect safely the drive.
I also noticed that in the app (see below), missing run are more frequent. The code is just executed under the button Run (first callback).
The command window shows the message I expect when it works but in fact the USB drive is still visible on "My Computer". If the disconnection works, I see an error message in the command window.
Do you have an idea what can I do to solve this issue or find it origin?
Best regards,
Pierre
The code:
function EjectUSB
% Create the PowerShell command to eject the drive
powershellCommand = ‘(New-Object -comObject Shell.Application).Namespace(17).ParseName(”E:”).InvokeVerb(”Eject”)’;
% Create the command to run PowerShell from MATLAB
command = sprintf(‘powershell -Command "%s"’, powershellCommand);
% Execute the PowerShell command
[status, cmdout] = system(command);
% Display the results
if status == 0
disp([‘Lecteur USB E éjecté avec succès.’]);
else
disp(‘Échec de l”éjection du lecteur USB.’);
disp(cmdout);
end
end
%Add a diskpart list to check if E: has been removed
The app:
classdef PotVibrantUI < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
AmplitudeSlider matlab.ui.control.Slider
FrequencySlider matlab.ui.control.Slider
Amplitude0to1EditField matlab.ui.control.NumericEditField
Amplitude0to1EditFieldLabel matlab.ui.control.Label
FrequencyHzEditField matlab.ui.control.NumericEditField
FrequencyHzEditFieldLabel matlab.ui.control.Label
RunButton matlab.ui.control.Button
end
properties (Access = private)
frequency = 20; % Default frequency value
amplitude = 0.5; % Default amplitude value
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: RunButton
function RunButtonPushed(app, event)
SetupFileCreation(app.frequency)
CustomFileCreation(app.amplitude)
pause(3)
EjectUSB
pause(3)
EjectUSB
end
% Value changing function: FrequencySlider
function FrequencySliderValueChanging(app, event)
changingValue = event.Value;
app.FrequencyHzEditField.Value = changingValue;
% Update the app.frequency property
app.frequency = changingValue;
% guidata() to share variables
end
% Value changed function: FrequencyHzEditField
function FrequencyHzEditFieldValueChanged(app, event)
value = app.FrequencyHzEditField.Value;
app.FrequencySlider.Value = value;
% Update the app.frequency property
app.frequency = value;
end
% Value changing function: AmplitudeSlider
function AmplitudeSliderValueChanging(app, event)
changingValue = event.Value;
app.Amplitude0to1EditField.Value = changingValue;
% Update the app.frequency property
app.amplitude = changingValue;
% guidata() to share variables
end
% Value changed function: Amplitude0to1EditField
function Amplitude0to1EditFieldValueChanged(app, event)
value = app.Amplitude0to1EditField.Value;
app.AmplitudeSlider.Value = value;
app.amplitude = value;
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure(‘Visible’, ‘off’);
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = ‘MATLAB App’;
% Create RunButton
app.RunButton = uibutton(app.UIFigure, ‘push’);
app.RunButton.ButtonPushedFcn = createCallbackFcn(app, @RunButtonPushed, true);
app.RunButton.FontSize = 24;
app.RunButton.Position = [26 41 568 80];
app.RunButton.Text = ‘Run’;
% Create FrequencyHzEditFieldLabel
app.FrequencyHzEditFieldLabel = uilabel(app.UIFigure);
app.FrequencyHzEditFieldLabel.HorizontalAlignment = ‘right’;
app.FrequencyHzEditFieldLabel.FontSize = 24;
app.FrequencyHzEditFieldLabel.Position = [49 435 170 31];
app.FrequencyHzEditFieldLabel.Text = ‘Frequency (Hz)’;
% Create FrequencyHzEditField
app.FrequencyHzEditField = uieditfield(app.UIFigure, ‘numeric’);
app.FrequencyHzEditField.ValueChangedFcn = createCallbackFcn(app, @FrequencyHzEditFieldValueChanged, true);
app.FrequencyHzEditField.FontSize = 24;
app.FrequencyHzEditField.Position = [234 434 100 32];
app.FrequencyHzEditField.Value = 20;
% Create Amplitude0to1EditFieldLabel
app.Amplitude0to1EditFieldLabel = uilabel(app.UIFigure);
app.Amplitude0to1EditFieldLabel.HorizontalAlignment = ‘right’;
app.Amplitude0to1EditFieldLabel.FontSize = 24;
app.Amplitude0to1EditFieldLabel.Position = [38 252 195 31];
app.Amplitude0to1EditFieldLabel.Text = ‘Amplitude (0 to 1)’;
% Create Amplitude0to1EditField
app.Amplitude0to1EditField = uieditfield(app.UIFigure, ‘numeric’);
app.Amplitude0to1EditField.ValueChangedFcn = createCallbackFcn(app, @Amplitude0to1EditFieldValueChanged, true);
app.Amplitude0to1EditField.FontSize = 24;
app.Amplitude0to1EditField.Position = [248 251 100 32];
app.Amplitude0to1EditField.Value = 0.5;
% Create FrequencySlider
app.FrequencySlider = uislider(app.UIFigure);
app.FrequencySlider.Limits = [10 40];
app.FrequencySlider.ValueChangingFcn = createCallbackFcn(app, @FrequencySliderValueChanging, true);
app.FrequencySlider.FontSize = 24;
app.FrequencySlider.Position = [26 418 473 3];
app.FrequencySlider.Value = 20;
% Create AmplitudeSlider
app.AmplitudeSlider = uislider(app.UIFigure);
app.AmplitudeSlider.Limits = [0 1];
app.AmplitudeSlider.MajorTicks = [0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1];
app.AmplitudeSlider.ValueChangingFcn = createCallbackFcn(app, @AmplitudeSliderValueChanging, true);
app.AmplitudeSlider.FontSize = 18;
app.AmplitudeSlider.Position = [20 207 479 3];
app.AmplitudeSlider.Value = 0.5;
% Show the figure after all components are created
app.UIFigure.Visible = ‘on’;
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = PotVibrantUI
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end Dear all,
I work on MATLAB R2023a and Windows 11 23H2.
Thanks to this post I coud do the following code which disconnect safely E:, a USB drive.
Unfortunately, sometimes it does not work, for example, when I change the plug from USB port, it needs several execution to disconnect safely the drive.
I also noticed that in the app (see below), missing run are more frequent. The code is just executed under the button Run (first callback).
The command window shows the message I expect when it works but in fact the USB drive is still visible on "My Computer". If the disconnection works, I see an error message in the command window.
Do you have an idea what can I do to solve this issue or find it origin?
Best regards,
Pierre
The code:
function EjectUSB
% Create the PowerShell command to eject the drive
powershellCommand = ‘(New-Object -comObject Shell.Application).Namespace(17).ParseName(”E:”).InvokeVerb(”Eject”)’;
% Create the command to run PowerShell from MATLAB
command = sprintf(‘powershell -Command "%s"’, powershellCommand);
% Execute the PowerShell command
[status, cmdout] = system(command);
% Display the results
if status == 0
disp([‘Lecteur USB E éjecté avec succès.’]);
else
disp(‘Échec de l”éjection du lecteur USB.’);
disp(cmdout);
end
end
%Add a diskpart list to check if E: has been removed
The app:
classdef PotVibrantUI < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
AmplitudeSlider matlab.ui.control.Slider
FrequencySlider matlab.ui.control.Slider
Amplitude0to1EditField matlab.ui.control.NumericEditField
Amplitude0to1EditFieldLabel matlab.ui.control.Label
FrequencyHzEditField matlab.ui.control.NumericEditField
FrequencyHzEditFieldLabel matlab.ui.control.Label
RunButton matlab.ui.control.Button
end
properties (Access = private)
frequency = 20; % Default frequency value
amplitude = 0.5; % Default amplitude value
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: RunButton
function RunButtonPushed(app, event)
SetupFileCreation(app.frequency)
CustomFileCreation(app.amplitude)
pause(3)
EjectUSB
pause(3)
EjectUSB
end
% Value changing function: FrequencySlider
function FrequencySliderValueChanging(app, event)
changingValue = event.Value;
app.FrequencyHzEditField.Value = changingValue;
% Update the app.frequency property
app.frequency = changingValue;
% guidata() to share variables
end
% Value changed function: FrequencyHzEditField
function FrequencyHzEditFieldValueChanged(app, event)
value = app.FrequencyHzEditField.Value;
app.FrequencySlider.Value = value;
% Update the app.frequency property
app.frequency = value;
end
% Value changing function: AmplitudeSlider
function AmplitudeSliderValueChanging(app, event)
changingValue = event.Value;
app.Amplitude0to1EditField.Value = changingValue;
% Update the app.frequency property
app.amplitude = changingValue;
% guidata() to share variables
end
% Value changed function: Amplitude0to1EditField
function Amplitude0to1EditFieldValueChanged(app, event)
value = app.Amplitude0to1EditField.Value;
app.AmplitudeSlider.Value = value;
app.amplitude = value;
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure(‘Visible’, ‘off’);
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = ‘MATLAB App’;
% Create RunButton
app.RunButton = uibutton(app.UIFigure, ‘push’);
app.RunButton.ButtonPushedFcn = createCallbackFcn(app, @RunButtonPushed, true);
app.RunButton.FontSize = 24;
app.RunButton.Position = [26 41 568 80];
app.RunButton.Text = ‘Run’;
% Create FrequencyHzEditFieldLabel
app.FrequencyHzEditFieldLabel = uilabel(app.UIFigure);
app.FrequencyHzEditFieldLabel.HorizontalAlignment = ‘right’;
app.FrequencyHzEditFieldLabel.FontSize = 24;
app.FrequencyHzEditFieldLabel.Position = [49 435 170 31];
app.FrequencyHzEditFieldLabel.Text = ‘Frequency (Hz)’;
% Create FrequencyHzEditField
app.FrequencyHzEditField = uieditfield(app.UIFigure, ‘numeric’);
app.FrequencyHzEditField.ValueChangedFcn = createCallbackFcn(app, @FrequencyHzEditFieldValueChanged, true);
app.FrequencyHzEditField.FontSize = 24;
app.FrequencyHzEditField.Position = [234 434 100 32];
app.FrequencyHzEditField.Value = 20;
% Create Amplitude0to1EditFieldLabel
app.Amplitude0to1EditFieldLabel = uilabel(app.UIFigure);
app.Amplitude0to1EditFieldLabel.HorizontalAlignment = ‘right’;
app.Amplitude0to1EditFieldLabel.FontSize = 24;
app.Amplitude0to1EditFieldLabel.Position = [38 252 195 31];
app.Amplitude0to1EditFieldLabel.Text = ‘Amplitude (0 to 1)’;
% Create Amplitude0to1EditField
app.Amplitude0to1EditField = uieditfield(app.UIFigure, ‘numeric’);
app.Amplitude0to1EditField.ValueChangedFcn = createCallbackFcn(app, @Amplitude0to1EditFieldValueChanged, true);
app.Amplitude0to1EditField.FontSize = 24;
app.Amplitude0to1EditField.Position = [248 251 100 32];
app.Amplitude0to1EditField.Value = 0.5;
% Create FrequencySlider
app.FrequencySlider = uislider(app.UIFigure);
app.FrequencySlider.Limits = [10 40];
app.FrequencySlider.ValueChangingFcn = createCallbackFcn(app, @FrequencySliderValueChanging, true);
app.FrequencySlider.FontSize = 24;
app.FrequencySlider.Position = [26 418 473 3];
app.FrequencySlider.Value = 20;
% Create AmplitudeSlider
app.AmplitudeSlider = uislider(app.UIFigure);
app.AmplitudeSlider.Limits = [0 1];
app.AmplitudeSlider.MajorTicks = [0 0.125 0.25 0.375 0.5 0.625 0.75 0.875 1];
app.AmplitudeSlider.ValueChangingFcn = createCallbackFcn(app, @AmplitudeSliderValueChanging, true);
app.AmplitudeSlider.FontSize = 18;
app.AmplitudeSlider.Position = [20 207 479 3];
app.AmplitudeSlider.Value = 0.5;
% Show the figure after all components are created
app.UIFigure.Visible = ‘on’;
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = PotVibrantUI
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end usb drive management MATLAB Answers — New Questions
