How To Run A Program Via JavaScript

// Sometimes, it's necessary to run a program via JavaScript instead of directly via an MSI CA.
// For example, it might be easier to locate the program or construct the command line in JavaScript than by
// trying to craft some set of SetProperty CA's to do the same thing.  Or, for example, InstallShield LE just
// won't let you.  This script demonstrates how to run a program and is designed to be run as a Deferred mode CA.
var ClassName_ScriptingRuntimeShell         = "WScript.Shell";

var argumentString              = "";
var installDir                  = "";
var programToRunPathname   = "";
var commandLineToRun            = "";


// CustomActionData format:  [INSTALLDIR]<?>
// If running in MSI, use arguments via standard CustomActionData interface, otherwise assume running outside MSI in debugger
if (DetectRunningInMSI())
    argumentString = Session.Property("CustomActionData");
else
    argumentString = "c:\\program files\\MyProgramDir\\";
arguments = argumentString.split("<?>");
if (arguments.length == 1)
{
    installDir = arguments[0];
}
else
{
    LogMessage("Argument string invalid (" +arguments.length+ "):  " +argumentString);
    throw 3;
}

installDir = EnsureEndsInBackslash(installDir);
programToRunPathname= installDir +"ProgramToRun.exe";
commandLineToRun = "\""+ programToRunPathname+"\" somecommand";
if (RunCommand(commandLineToRun) != 0)
{
    // Critical error, fail install
    throw 3;
}


function RunCommand( commandLine )
// Runs the specified command line and returns the process exit code or failure code
{
    var     returnVal       = -1;
    var     shellUtil       = null;

    // Validate parameters
    if (commandLine == "")
        return -1;

    shellUtil = SafeGetActiveXObject(ClassName_ScriptingRuntimeShell);
    if (shellUtil != null)
    {
        try
        {
            LogMessage("RunCommand:  Running "+commandLine);
            returnVal = shellUtil.Run(commandLine, 0, true);
            if (returnVal != 0)
                LogMessage("RunCommand:  Error " +returnVal+ " returned by command line "+commandLine);
        }
        catch (runException)
        {
        // 0x80070002
            if (runException.number == -2147024894)
                LogMessage("RunCommand:  File not found error running command " +commandLine+ ":  " +runException.message);
            else
                LogMessage("RunCommand:  Error " +runException.number+ " running command " +commandLine+ ":  " +runException.message);
            returnVal = runException.number;
        }
        shellUtil = null;
    }

    return returnVal;
}

function LogMessage( messageString )
// Writes a line to the MSI log, or the console if running outside MSI.
{
    var     customActionName        = "RunProgram";
   
    if (DetectRunningInMSI())
    {
        var     msiMessageTypeInfo      = 0x04000000
        var     logRecord               = null;
        var     currTime                = new Date();

        logRecord = Installer.CreateRecord(1);
        logRecord.StringData(0) = currTime.toTimeString() +" "+ customActionName +": [1]";
        logRecord.StringData(1) = messageString;
        Session.Message(msiMessageTypeInfo, logRecord);
        logRecord = null;
    }
    else
    {
        var     currTime                = new Date();

        messageString = currTime.toTimeString() +" "+ customActionName +": "+ messageString;
        WScript.Echo(messageString);
    }
}

function DetectRunningInMSI()
// Returns TRUE if running in MSI, else FALSE
{
    var returnVal       = true;
    var stringVal       = "";

    try
    {
        // Try to reference the Session object, which is only provided by the MSI runtime engine
        stringVal = Session.Property("ProductCode");
    }
    catch (thisException)
    {
        // An exception is only thrown if the runtime couldn't resolve Session, which means
        // this script is not running under MSI
        returnVal = false;
    }

    return returnVal;
}

function SafeGetActiveXObject( className )
// Creates an instance of className and returns it, or null if an error occurs, and logs the error
{
    var returnVal    = null;

    try
    {
        returnVal = new ActiveXObject(className);
    }
    catch (createException)
    {
        LogMessage("SafeGetActiveXObject:  Error " +createException.number+ " creating object of class " +className+ ": " +createException.message);
    }

    return returnVal;
}

function EnsureEndsInBackslash( directoryPath )
// Returns directoryPath ending in a backslash if it does not already end in one.
{
    var returnVal = directoryPath;

    if (returnVal.substring(returnVal.length, returnVal.length-1) != "\\")
        returnVal = returnVal + "\\";

    return returnVal;
}
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