Marshal.GetHRForLastWin32Error 方法

定義

命名空間:

System.Runtime.InteropServices

組件:

System.Runtime.InteropServices.dll

來源:

Marshal.cs

傳回 HRESULT，它對應於使用 Marshal 執行的 Win32 程式碼所引發的最後一個錯誤。

public:
 static int GetHRForLastWin32Error();

public static int GetHRForLastWin32Error ();

static member GetHRForLastWin32Error : unit -> int

Public Shared Function GetHRForLastWin32Error () As Integer

傳回

Int32

對應於最後一個 Win32 錯誤碼的 HRESULT。

範例

下列範例示範如何使用 方法來擷取對應至 Win32 錯誤碼的 GetHRForLastWin32Error HRESULT。

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

Imports System.Runtime.InteropServices

Module 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)> _
    Function MessageBox(ByVal hwnd As IntPtr, ByVal text As String, ByVal caption As String, ByVal type As UInt32) As Integer
    End Function

End Module

Module Program


    Sub 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.
        Dim HRESULT As Integer

        HRESULT = Marshal.GetHRForLastWin32Error()

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

    End Sub

    Sub Main(ByVal args() As String)

        Run()

    End Sub

End Module

' This code example displays the following to the console: 
'
' Calling Win32 MessageBox with error...
' The last Win32 Error was: -2147023496

備註

目標函式必須已 setLastError 設定元數據旗標。 例如， SetLastError 的 System.Runtime.InteropServices.DllImportAttribute 欄位必須是 true。 設定此旗標的程式取決於所使用的來源語言：C# 和 C++ 預設為 false ，但 Declare Visual Basic 中的 語句為 true。

另請參閱

• DllImportAttribute