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Marshal.GetHRForLastWin32Error Method

Returns the HRESULT corresponding to the last error incurred by Win32 code executed using Marshal.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public static int GetHRForLastWin32Error()

Return Value

Type: System.Int32
The HRESULT corresponding to the last Win32 error code.

The target function must have had the setLastError metadata flag set. For example, the SetLastError field of the System.Runtime.InteropServices.DllImportAttribute must be true. The process for setting this flag depends on the source language used: C# and C++ are false by default, but the Declare statement in Visual Basic is true.

The following example demonstrates how to retrieve an HRESULT corresponding to a Win32 error code using the GetHRForLastWin32Error method.

using System;
using System.Runtime.InteropServices;

internal class Win32
{
    // Use DllImportAttribute to inport the Win32 MessageBox 
    // function.  Set the SetLastError flag to true to allow 
    // the function to set the Win32 error.
    [DllImportAttribute("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
    public static extern int MessageBox(IntPtr hwnd, String text, String caption, uint type);

}

class Program
{

    static void Run()
    {

        // Call the MessageBox with an invalid window handle to 
        // produce a Win32 error.

        Console.WriteLine("Calling Win32 MessageBox with error...");

        Win32.MessageBox(new IntPtr(123132), "Press OK...", "Press OK Dialog", 0);

        // Get the last error and display it. 

        int HRESULT = Marshal.GetHRForLastWin32Error();

        Console.WriteLine("The last Win32 Error was: " + HRESULT);
    }

    static void Main(string[] args)
    {
        Run();
    }
}
// This code example displays the following to the console:  
// 
// Calling Win32 MessageBox with error... 
// The last Win32 Error was: -2147023496

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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