LCIDConversionAttribute 類別

定義

命名空間:

System.Runtime.InteropServices

組件:

System.Runtime.InteropServices.dll

來源:

LCIDConversionAttribute.cs

指示方法的 Unmanaged 簽章需要地區設定識別項 (LCID) 參數。

public ref class LCIDConversionAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)]
public sealed class LCIDConversionAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Method, Inherited=false)>]
type LCIDConversionAttribute = class
    inherit Attribute

Public NotInheritable Class LCIDConversionAttribute
Inherits Attribute

繼承

Object

Attribute

LCIDConversionAttribute

屬性

AttributeUsageAttribute

範例

下列範例會根據提供給 LCIDConversionAttribute 的不同值來示範不同的簽章翻譯。

using namespace System;
using namespace System::Runtime::InteropServices;
using namespace System::Reflection;

#define LCID_INSTALLED 1
#define LCID_SUPPORTED 2

ref class LCIDAttrSample
{
public:

   // Position of the LCID argument

   [DllImport("KERNEL32.DLL",EntryPoint="IsValidLocale",SetLastError=true,CharSet=CharSet::Auto)]
   [LCIDConversionAttribute(0)]
   static bool IsValidLocale( int dwFlags ); // options

   void CheckCurrentLCID()
   {
      MethodInfo^ mthIfo = this->GetType()->GetMethod( "IsValidLocale" );
      Attribute^ attr = Attribute::GetCustomAttribute( mthIfo, LCIDConversionAttribute::typeid );
      if ( attr != nullptr )
      {
         LCIDConversionAttribute^ lcidAttr = dynamic_cast<LCIDConversionAttribute^>(attr);
         Console::WriteLine( "Position of the LCID argument in the unmanaged signature: {0}", lcidAttr->Value );
      }

      bool res = IsValidLocale( LCID_INSTALLED );
      Console::WriteLine( "Result LCID_INSTALLED {0}", res );
      res = IsValidLocale( LCID_SUPPORTED );
      Console::WriteLine( "Result LCID_SUPPORTED {0}", res );
   }
};

int main()
{
   LCIDAttrSample^ smpl = gcnew LCIDAttrSample;
   smpl->CheckCurrentLCID();
}

using System;
using System.Runtime.InteropServices;
using System.Reflection;

class LCIDAttrSample
{
    private const int LCID_INSTALLED = 1;
    private const int LCID_SUPPORTED = 2;

    [DllImport("KERNEL32.DLL", EntryPoint="IsValidLocale", SetLastError = true, CharSet = CharSet.Auto)]
    [LCIDConversionAttribute(0)] // Position of the LCID argument
    public static extern bool IsValidLocale(
                                                uint dwFlags            // options
                                            );

    public void CheckCurrentLCID()
    {
        MethodInfo mthIfo = this.GetType().GetMethod("IsValidLocale");
        Attribute attr = Attribute.GetCustomAttribute(mthIfo,typeof(LCIDConversionAttribute));

        if( attr != null)
        {
            LCIDConversionAttribute lcidAttr = (LCIDConversionAttribute)attr;
            Console.WriteLine("Position of the LCID argument in the unmanaged signature: " + lcidAttr.Value.ToString());
        }

        bool res = IsValidLocale(LCID_INSTALLED);
        Console.WriteLine("Result LCID_INSTALLED " + res.ToString());
        res = IsValidLocale(LCID_SUPPORTED);
        Console.WriteLine("Result LCID_SUPPORTED " + res.ToString());
    }

    static void Main(string[] args)
    {
        LCIDAttrSample smpl = new LCIDAttrSample();
        smpl.CheckCurrentLCID();
    }
}

Imports System.Runtime.InteropServices
Imports System.Reflection

Class LCIDAttrSampler

    Const LCID_INSTALLED As Integer = 1
    Const LCID_SUPPORTED As Integer = 2

    <DllImport("KERNEL32.DLL", EntryPoint:="IsValidLocale", _
    SetLastError:=True, CharSet:=CharSet.Unicode, _
    CallingConvention:=CallingConvention.StdCall), _
    LCIDConversionAttribute(0)> _
    Public Shared Function IsValidLocale(ByVal dwFlags As Integer) As Boolean
    End Function

    Public Sub CheckCurrentLCID()
        Dim mthIfo As MethodInfo = Me.GetType().GetMethod("IsValidLocale")
        Dim attr As Attribute = Attribute.GetCustomAttribute(mthIfo, GetType(LCIDConversionAttribute))

        If Not(attr Is Nothing) Then
            Dim lcidAttr As LCIDConversionAttribute = CType(attr, LCIDConversionAttribute)
            Console.WriteLine("Position of the LCID argument in the unmanaged signature: " + lcidAttr.Value.ToString())
        End If

        Dim res As Boolean = IsValidLocale(LCID_INSTALLED)
        Console.WriteLine("Result LCID_INSTALLED " + res.ToString())
        res = IsValidLocale(LCID_SUPPORTED)
        Console.WriteLine("Result LCID_SUPPORTED " + res.ToString())
    End Sub

    Public Shared Sub Main()
        Dim smpl As LCIDAttrSampler = New LCIDAttrSampler()
        smpl.CheckCurrentLCID()
    End Sub

End Class

備註

您可以將此屬性套用至方法。

這個屬性工作表示封送處理器應該預期在指定的方法引數之後傳遞 LCID。 從 Managed 呼叫到 Unmanaged 程式碼時，封送處理器會自動提供 LCID 引數。

建構函式

LCIDConversionAttribute(Int32)

使用在 Unmanaged 簽章的 LCID 位置，初始化 LCIDConversionAttribute 類別的新執行個體。

屬性

TypeId	在衍生類別中實作時，取得這個 Attribute 的唯一識別碼。 (繼承來源 Attribute)
Value	取得 LCID 引數在 Unmanaged 簽章的位置。

方法

Equals(Object)	傳回值，這個值指出此執行個體是否與指定的物件相等。 (繼承來源 Attribute)
GetHashCode()	傳回這個執行個體的雜湊碼。 (繼承來源 Attribute)
GetType()	取得目前執行個體的 Type。 (繼承來源 Object)
IsDefaultAttribute()	在衍生類別中覆寫時，表示這個執行個體的值是衍生類別的預設值。 (繼承來源 Attribute)
Match(Object)	在衍生類別中覆寫時，會傳回值，表示這個執行個體是否等於指定物件。 (繼承來源 Attribute)
MemberwiseClone()	建立目前 Object 的淺層複製。 (繼承來源 Object)
ToString()	傳回代表目前物件的字串。 (繼承來源 Object)