Ngen on setup, VB to C# translation

[Bekjong]

Thanks, didn't know this site. This actually gives me all but the part I don't understand, which is:

Private Declare Function GetCORSystemDirectory Lib "mscoree.dll" _
( System.Runtime.InteropServices.UnmanagedType.LPWStr)> _
ByVal Buffer As System.Text.StringBuilder, _
ByVal BufferLength As Integer, ByRef Length As Integer) As Integer

Looks like some kind of P/Invoke signature import or something :confused:. The converter you gave me gets me a "stack empty" error.

Standards are great! Everybody should have one!

[Giorgi Dalakishvili]

Yes, it looks like a P/Invoke signature. Did you try converting it to c# yourself?

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[Bekjong]

[Message Deleted]

[Bekjong]

Ok, I actually got it to compile using: [DllImport("mscoree.dll")] static extern int GetCORSystemDirectory( [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)] StringBuilder buffer, Int32 buffer_length, out Int32 length ); And then calling the function like this: System.Text.StringBuilder Path = new System.Text.StringBuilder(1024); int Size; GetCORSystemDirectory(Path, Path.Capacity, out Size); Still doesn't seem to be working though, can you tell me if the signature is right?

Standards are great! Everybody should have one!

[Giorgi Dalakishvili]

In the original there is System.Text.StringBuilder, why did you change it with just String? If you've never worked with P/Invoke, I suggest you have a look at this: P/Invoke[^]

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[Bekjong]

You're absolutely right. Should have noticed that. Take a look at my second try (below) please.

Standards are great! Everybody should have one!

[Giorgi Dalakishvili]

You should also have notices that original code uses System.Runtime.InteropServices.UnmanagedType.LPWStr and not System.Runtime.InteropServices.UnmanagedType.LPStr Also, third parameter of GetCORSystemDirectory Function is DWORD* so you should pass a reference to int.

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[Bekjong]

Ok, thanks for the advice I've updated the code to:

[DllImport("mscoree.dll")]
static extern int GetCORSystemDirectory(
[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)] StringBuilder buffer,
Int32 buffer_length,
ref Int32 length
);

And the call is now like this:

// Gets the path to the Framework directory.
System.Text.StringBuilder Path = new System.Text.StringBuilder(1024);
int Size = 0;
GetCORSystemDirectory(Path, Path.Capacity, ref Size);

Still it's not working :(. If I could only set a breakpoint to find out why, but this doesn't seem to be supported for installer projects...

Standards are great! Everybody should have one!

[Giorgi Dalakishvili]

Are you getting an error/exception or is it returning wrong data? Did you turn the stringbuilder into string?

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[Bekjong]

I'm on Vista and getting code 2869, no further explanation. I've googled it for a bit and now suspect it's a security problem. This would mean the p/invoke call is actually good now. This is the code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration.Install;
using System.Runtime.InteropServices;
using System.Text;
using System.Diagnostics;

namespace InstallationHelper
{
[RunInstaller(true)]
public partial class InstallationHelper : Installer
{
[DllImport("mscoree.dll")]
static extern int GetCORSystemDirectory(
[System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPWStr)] StringBuilder buffer,
Int32 buffer_length,
ref Int32 length
);

    public InstallationHelper()
    {
        InitializeComponent();
    }

    \[System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand)\]
    public override void Install(System.Collections.IDictionary savedState)
    {
        base.Install(savedState);
        string Args = this.Context.Parameters\["Args"\];

        if (Args == "")
        {
            throw new InstallException("No arguments specified");
        }

        // Gets the path to the Framework directory.
        System.Text.StringBuilder Path = new System.Text.StringBuilder(1024);
        int Size = 0;
        GetCORSystemDirectory(Path, Path.Capacity, ref Size);

        Process P;
        // Quotes the arguments, in case they have a space in them.
        ProcessStartInfo Si = new ProcessStartInfo(Path.ToString() + "ngen.exe", "\\"" + Args + "\\"");
        Si.WindowStyle = ProcessWindowStyle.Maximized;
        try
        {
            P = Process.Start(Si);
            P.WaitForExit();
        }
        catch (Exception e)
        {
            throw new InstallException(e.Message);
        }
    }


}

}

Standards are great! Everybody should have one!

[Giorgi Dalakishvili]

Yes, according to google it looks like a problem with permissions and vista. You could try running it on XP or calling unmanaged function from a normal windows application so that you can set breakpoint.

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[Bekjong]

Ok, problem solved! Cleaning up seems to be the right thing to do here: Just removing the constructor was enough to get the thing going for some reason :). Thanks a bunch Giorgi, you've been a real help!

Standards are great! Everybody should have one!

[Giorgi Dalakishvili]

Glad to help you :)

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