Marshal.GetHRForLastWin32Error 方法
定义
重要
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返回 HRESULT，它对应于使用 Marshal 执行的 Win32 代码引起的最后一个错误。
public:
static int GetHRForLastWin32Error();[System.Security.SecurityCritical]
public static int GetHRForLastWin32Error ();public static int GetHRForLastWin32Error ();[<System.Security.SecurityCritical>]
static member GetHRForLastWin32Error : unit -> intstatic member GetHRForLastWin32Error : unit -> intPublic Shared Function GetHRForLastWin32Error () As Integer返回
对应于最后一个 Win32 错误代码的 HRESULT。
- 属性
示例
以下示例演示如何使用 GetHRForLastWin32Error 该方法检索与 Win32 错误代码对应的 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
注解
目标函数必须 setLastError 已设置元数据标志。 例如，字段SetLastErrorSystem.Runtime.InteropServices.DllImportAttribute必须是 true。 设置此标志的过程取决于使用的源语言：C# 和 C++ 默认为 false ，但 Declare Visual Basic 中的语句为 true。