How to add a scheduled task on network connection/disconnection event with Inno Setup

Question

I want to use Inno Setup for my program installation and I need Inno Setup to create a task in Windows Task Scheduler to launch my program.exe every time the in

Answer 1

As with any other obscure scheduling settings, you have to use XML definition of the task.

The easiest is to configure the task in Windows Task Scheduler GUI, select the created task and choose Export command.

It will create an XML definition of the task, which will contain something like:

<?xml version="1.0" encoding="UTF-16"?>
<Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
  <!-- ... -->
  <Triggers>
    <EventTrigger>
      <Enabled>true</Enabled>
      <Subscription>&lt;QueryList&gt;&lt;Query Id="0" Path="Microsoft-Windows-NetworkProfile/Operational"&gt;&lt;Select Path="Microsoft-Windows-NetworkProfile/Operational"&gt;*[System[Provider[@Name='NetworkProfile'] and EventID=10000]]&lt;/Select&gt;&lt;/Query&gt;&lt;/QueryList&gt;</Subscription>
    </EventTrigger>
  </Triggers>
  <!-- ... -->
</Task>

Edit the XML to remove everything, what is specific to your computer.

And then use the exported XML as a template for a file, that you will create on the fly in the installer with an actual path to your installed application:

[Run]
Filename: "schtasks.exe"; \
    Parameters: "/Create /TN MyTask /XML ""{tmp}\Task.xml"""; \
    StatusMsg: "Scheduling task..."; Flags: runhidden; BeforeInstall: CreateTaskXml

[Code]

procedure CreateTaskXml;
var
  TaskXml: string;
begin
  TaskXml :=
    '<?xml version="1.0"?>' + #13#10 +
    '<Task version="1.2" xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">'
      + #13#10 +
    '  <Triggers>' + #13#10 +
    { The EventTrigger here }
    '  </Triggers>' + #13#10 +
    { ... }
    '  <Actions Context="Author">' + #13#10 +
    '    <Exec>' + #13#10 +
    '      <Command>' + ExpandConstant('{app}\MyProg.exe') + '</Command>' + #13#10 +
    '    </Exec>' + #13#10 +
    '  </Actions>' + #13#10 +
    '</Task>' + #13#10;

  if SaveStringToFile(ExpandConstant('{tmp}\Task.xml'), TaskXml, False) then
  begin
    Log('Task XML successfully created');
  end
    else
  begin
    Log('Failed to create task XML');
  end;
end;

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The SaveStringToFile function in CreateTaskXml creates the XML in Ansi encoding. If you need Unicode, you have to create the XML in UTF-16 encoding (schtasks does not support UTF-8).