Question

I have written a custom action in C# to check for the drive existence like below, I got stuck in between.

 [CustomAction]
    public static ActionResult MySimpleAction(Session session)
    {        
        if (Directory.Exists("F:\\"))
        {
            return ActionResult.Success;
        }
        else
        {
            return ActionResult.Failure;
        }
    }

And in wxs file, I am running the custom action as like below.

 <Binary Id="myAction" SourceFile="MyCustomAction.CA.dll" />
 <CustomAction Id="myActionId"
                  BinaryKey="myAction"
                  DllEntry="MySimpleAction"
                  Execute="immediate"
                  Return="check" />

<InstallExecuteSequence>
  <Custom Action="myActionId" After="InstallInitialize"  >  </Custom> 
</InstallExecuteSequence>

If I run the msi in the target machine where I have F:\ drive then installation succeeds, if the target machine doesn’t have F:\ drive then Setup failed, I am getting error as “Setup wizard ended prematurely because of an error. Your system has not been modified.“

What I am trying to do here is, if F:\ drive is available in the target computer (My Custom action succeeds), I want to set my root drive as F:\, and I want to install the application in F:\MyApp\Bin

     <Property Id="ROOTDRIVE"><![CDATA[F:\]]></Property>
     <Directory Id="TARGETDIR" Name="SourceDir">
       <Directory Id="INSTALLFOLDERLOCATION" Name="MyApp">
        <Directory Id="INSTALLLOCATION" Name="Bin">

if F:\ drive is not available in the target computer (My Custom action fails), I want to set my root drive as C:\, and I want to install in C:\MyApp\Bin

     <Property Id="ROOTDRIVE"><![CDATA[C:\]]></Property>
      <Directory Id="TARGETDIR" Name="SourceDir">
       <Directory Id="INSTALLFOLDERLOCATION" Name="MyApp">
        <Directory Id="INSTALLLOCATION" Name="Bin">

How can I set the root drive property by using this custom action?
Thanks for the help!

Answer 1

I thank Christopher Painter and ChrisPatrick for helping me!!! the below code made the trick to work.

 [CustomAction]
    public static ActionResult MySimpleAction(Session session)
    {
        session.Log("DriveInfo Starts");
        DriveInfo[] drives = DriveInfo.GetDrives();
        foreach (DriveInfo d in drives)
        {
            if (d.Name.Contains("F") & d.IsReady == true & d.DriveType.ToString() == "Fixed")
            {                   
              session["TARGETDIR"] = "F:\\";                   
            }
            else
            {
                session["TARGETDIR"] = "C:\\";
                session.Log("No F:\\ Drive Found!!!!");                    
            }
        }
        session.Log("DriveInfo Ends");
        return ActionResult.Success;

And in the .wxs file,

  <Binary Id="myAction" SourceFile="MyCustomAction.CA.dll" />

   <Directory Id="TARGETDIR" Name="SourceDir">
   <Directory Id="INSTALLFOLDERLOCATION" Name="MyApp">
    <Directory Id="INSTALLLOCATION" Name="Bin">

     <CustomAction Id="myActionId" BinaryKey="myAction" DllEntry="MySimpleAction" Execute="immediate" Return="check" />

      <InstallUISequence>
      <Custom Action="myActionId" Before="CostFinalize" > NOT Installed </Custom>      
      </InstallUISequence>