Hello guys,
Can someone please help me with EstimateFileRiskLevel function in Windows Shell with Interop.Call?

I read official documentation here but i found it not simple enough..

I wrote this:

code:

---

function test() {
var MAX_PATH = 260;
var url = "C:\Documents and Settings\MyName\Desktop\myfile.exe"
var result = Interop.Allocate((MAX_PATH+1)*2);

Interop.Call('shell32.dll', 'EstimateFileRiskLevel', url, ".exe", pszHandler, result);

return result;
}

---

I think pszHandler may be a path to Notepad (for txt files) for example...

I think you're reading the result wrong btw and may want to return result.ReadString or something similar (not too good with datablocks)

I tried this:

code:

---

function test() {
    var MAX_PATH = 260;
    var url = "C:\Documents and Settings\Vincy\Desktop\headers.txt";
    var han = "C:\WINDOWS\notepad.exe";
    var result = Interop.Allocate((MAX_PATH+1)*2);

    Interop.Call('shell32.dll', 'EstimateFileRiskLevel', url, ".txt", han, result);
    var result = result.ReadString(0, false);
    return result;
}

---

quote:

---

Originally posted by wincy

But debug says something like:
CallDll failed collocation of function "EstimateFileRiskLevel"...

What should i do? How should i read the result?
Thanks

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quote:

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Remarks
This function is not declared in a public header or included in a library file. To use it you must load it directly from Winshfhc.dll by ordinal 101.

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quote:

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Originally posted by CookieRevised

The correct error you get is:
"Interop.Call failed to locate function "EstimateFileRiskLevel""
Remember it is absolutely very important to always paste errors correctly and exactly when you're seeking help.

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quote:

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Originally posted by CookieRevised

In other words: you can not use this Windows API in this way.

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I tried creating a C# wrapper for the function however this is the first time I'm attempting to use unsafe code in C# and my C# skills are lacking anyway, so I'm running into some walls.

I can't read the result from the function, maybe anyone here knows what I'm doing wrong?

C# code:

---

using System;
using System.Runtime.InteropServices;

namespace EstimateFileRiskLevelWrapper
{
    public class EstimateFileRiskLevelWrapper
    {
        [DllImport("winshfhc.dll", EntryPoint = "#101")]
        public static extern int EstimateFileRiskLevel([MarshalAs(UnmanagedType.LPWStr)] String pszFilePath, [MarshalAs(UnmanagedType.LPWStr)] String pszExt, [MarshalAs(UnmanagedType.LPWStr)] String pszHandler, ref IntPtr riskLevel);
        /*HRESULT EstimateFileRiskLevel(
            LPCWSTR pszFilePath,
            LPCWSTR pszExt,
            LPCWSTR pszHandler,
            FILE_RISK_LEVEL *pfrlEstimate
        );*/
    }
}

---

C# code:

---

EstimateFileRiskLevelWrapper.EstimateFileRiskLevelWrapper.EstimateFileRiskLevel(
                    fpath,
                    ".php",
                    hpath,
                    ref risklevel);
                IntPtr ptr = Marshal.ReadIntPtr(risklevel);

---

Does something like this help at all?

http://msdn.microsoft.com/en-us/library/bb776297%28VS.85%29.aspx

quote:

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Originally posted by matty
Does something like this help at all?

http://msdn.microsoft.com/en-us/library/bb776297%28VS.85%29.aspx

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Going a bit offtopic, but does anyone know why i'm getting the errors i'm getting in my above C# test?

Would help me out a lot with my understanding of unsafe/unmanaged code in C#