IntPtr 結構
定義
重要
部分資訊涉及發行前產品,在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊,不做任何明確或隱含的瑕疵擔保。
表示帶正負號的整數,其中位寬度與指標相同。
public value class IntPtr
public value class IntPtr : IComparable<IntPtr>, IEquatable<IntPtr>, IParsable<IntPtr>, ISpanParsable<IntPtr>, IUtf8SpanParsable<IntPtr>, System::Numerics::IAdditionOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IAdditiveIdentity<IntPtr, IntPtr>, System::Numerics::IBinaryInteger<IntPtr>, System::Numerics::IBinaryNumber<IntPtr>, System::Numerics::IBitwiseOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IComparisonOperators<IntPtr, IntPtr, bool>, System::Numerics::IDecrementOperators<IntPtr>, System::Numerics::IDivisionOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IEqualityOperators<IntPtr, IntPtr, bool>, System::Numerics::IIncrementOperators<IntPtr>, System::Numerics::IMinMaxValue<IntPtr>, System::Numerics::IModulusOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IMultiplicativeIdentity<IntPtr, IntPtr>, System::Numerics::IMultiplyOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::INumber<IntPtr>, System::Numerics::INumberBase<IntPtr>, System::Numerics::IShiftOperators<IntPtr, int, IntPtr>, System::Numerics::ISignedNumber<IntPtr>, System::Numerics::ISubtractionOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IUnaryNegationOperators<IntPtr, IntPtr>, System::Numerics::IUnaryPlusOperators<IntPtr, IntPtr>, System::Runtime::Serialization::ISerializable
public value class IntPtr : IComparable, IComparable<IntPtr>, IEquatable<IntPtr>, IFormattable, System::Runtime::Serialization::ISerializable
public value class IntPtr : IComparable, IComparable<IntPtr>, IEquatable<IntPtr>, ISpanFormattable, System::Runtime::Serialization::ISerializable
public value class IntPtr : IComparable<IntPtr>, IEquatable<IntPtr>, IParsable<IntPtr>, ISpanParsable<IntPtr>, System::Numerics::IAdditionOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IAdditiveIdentity<IntPtr, IntPtr>, System::Numerics::IBinaryInteger<IntPtr>, System::Numerics::IBinaryNumber<IntPtr>, System::Numerics::IBitwiseOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IComparisonOperators<IntPtr, IntPtr, bool>, System::Numerics::IDecrementOperators<IntPtr>, System::Numerics::IDivisionOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IEqualityOperators<IntPtr, IntPtr, bool>, System::Numerics::IIncrementOperators<IntPtr>, System::Numerics::IMinMaxValue<IntPtr>, System::Numerics::IModulusOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IMultiplicativeIdentity<IntPtr, IntPtr>, System::Numerics::IMultiplyOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::INumber<IntPtr>, System::Numerics::INumberBase<IntPtr>, System::Numerics::IShiftOperators<IntPtr, int, IntPtr>, System::Numerics::ISignedNumber<IntPtr>, System::Numerics::ISubtractionOperators<IntPtr, IntPtr, IntPtr>, System::Numerics::IUnaryNegationOperators<IntPtr, IntPtr>, System::Numerics::IUnaryPlusOperators<IntPtr, IntPtr>, System::Runtime::Serialization::ISerializable
public value class IntPtr : IEquatable<IntPtr>, System::Runtime::Serialization::ISerializable
public value class IntPtr : System::Runtime::Serialization::ISerializable
public struct IntPtr
public readonly struct IntPtr : IComparable<IntPtr>, IEquatable<IntPtr>, IParsable<IntPtr>, ISpanParsable<IntPtr>, IUtf8SpanParsable<IntPtr>, System.Numerics.IAdditionOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IAdditiveIdentity<IntPtr,IntPtr>, System.Numerics.IBinaryInteger<IntPtr>, System.Numerics.IBinaryNumber<IntPtr>, System.Numerics.IBitwiseOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IComparisonOperators<IntPtr,IntPtr,bool>, System.Numerics.IDecrementOperators<IntPtr>, System.Numerics.IDivisionOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IEqualityOperators<IntPtr,IntPtr,bool>, System.Numerics.IIncrementOperators<IntPtr>, System.Numerics.IMinMaxValue<IntPtr>, System.Numerics.IModulusOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IMultiplicativeIdentity<IntPtr,IntPtr>, System.Numerics.IMultiplyOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.INumber<IntPtr>, System.Numerics.INumberBase<IntPtr>, System.Numerics.IShiftOperators<IntPtr,int,IntPtr>, System.Numerics.ISignedNumber<IntPtr>, System.Numerics.ISubtractionOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IUnaryNegationOperators<IntPtr,IntPtr>, System.Numerics.IUnaryPlusOperators<IntPtr,IntPtr>, System.Runtime.Serialization.ISerializable
public readonly struct IntPtr : IComparable, IComparable<IntPtr>, IEquatable<IntPtr>, IFormattable, System.Runtime.Serialization.ISerializable
public readonly struct IntPtr : IComparable, IComparable<IntPtr>, IEquatable<IntPtr>, ISpanFormattable, System.Runtime.Serialization.ISerializable
public readonly struct IntPtr : IComparable<IntPtr>, IEquatable<IntPtr>, IParsable<IntPtr>, ISpanParsable<IntPtr>, System.Numerics.IAdditionOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IAdditiveIdentity<IntPtr,IntPtr>, System.Numerics.IBinaryInteger<IntPtr>, System.Numerics.IBinaryNumber<IntPtr>, System.Numerics.IBitwiseOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IComparisonOperators<IntPtr,IntPtr,bool>, System.Numerics.IDecrementOperators<IntPtr>, System.Numerics.IDivisionOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IEqualityOperators<IntPtr,IntPtr,bool>, System.Numerics.IIncrementOperators<IntPtr>, System.Numerics.IMinMaxValue<IntPtr>, System.Numerics.IModulusOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IMultiplicativeIdentity<IntPtr,IntPtr>, System.Numerics.IMultiplyOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.INumber<IntPtr>, System.Numerics.INumberBase<IntPtr>, System.Numerics.IShiftOperators<IntPtr,int,IntPtr>, System.Numerics.ISignedNumber<IntPtr>, System.Numerics.ISubtractionOperators<IntPtr,IntPtr,IntPtr>, System.Numerics.IUnaryNegationOperators<IntPtr,IntPtr>, System.Numerics.IUnaryPlusOperators<IntPtr,IntPtr>, System.Runtime.Serialization.ISerializable
public struct IntPtr : IEquatable<IntPtr>, System.Runtime.Serialization.ISerializable
public readonly struct IntPtr : IEquatable<IntPtr>, System.Runtime.Serialization.ISerializable
[System.Serializable]
public struct IntPtr : System.Runtime.Serialization.ISerializable
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public struct IntPtr : System.Runtime.Serialization.ISerializable
public struct IntPtr : System.Runtime.Serialization.ISerializable
type nativeint = struct
type nativeint = struct
interface IFormattable
interface IParsable<nativeint>
interface ISpanFormattable
interface ISpanParsable<nativeint>
interface IUtf8SpanFormattable
interface IUtf8SpanParsable<nativeint>
interface IAdditionOperators<nativeint, nativeint, nativeint>
interface IAdditiveIdentity<nativeint, nativeint>
interface IBinaryInteger<nativeint>
interface IBinaryNumber<nativeint>
interface IBitwiseOperators<nativeint, nativeint, nativeint>
interface IComparisonOperators<nativeint, nativeint, bool>
interface IEqualityOperators<nativeint, nativeint, bool>
interface IDecrementOperators<nativeint>
interface IDivisionOperators<nativeint, nativeint, nativeint>
interface IIncrementOperators<nativeint>
interface IModulusOperators<nativeint, nativeint, nativeint>
interface IMultiplicativeIdentity<nativeint, nativeint>
interface IMultiplyOperators<nativeint, nativeint, nativeint>
interface INumber<nativeint>
interface INumberBase<nativeint>
interface ISubtractionOperators<nativeint, nativeint, nativeint>
interface IUnaryNegationOperators<nativeint, nativeint>
interface IUnaryPlusOperators<nativeint, nativeint>
interface IShiftOperators<nativeint, int, nativeint>
interface IMinMaxValue<nativeint>
interface ISignedNumber<nativeint>
interface ISerializable
type nativeint = struct
interface IFormattable
interface ISerializable
type nativeint = struct
interface ISpanFormattable
interface IFormattable
interface ISerializable
type nativeint = struct
interface IFormattable
interface IParsable<nativeint>
interface ISpanFormattable
interface ISpanParsable<nativeint>
interface IAdditionOperators<nativeint, nativeint, nativeint>
interface IAdditiveIdentity<nativeint, nativeint>
interface IBinaryInteger<nativeint>
interface IBinaryNumber<nativeint>
interface IBitwiseOperators<nativeint, nativeint, nativeint>
interface IComparisonOperators<nativeint, nativeint, bool>
interface IEqualityOperators<nativeint, nativeint, bool>
interface IDecrementOperators<nativeint>
interface IDivisionOperators<nativeint, nativeint, nativeint>
interface IIncrementOperators<nativeint>
interface IModulusOperators<nativeint, nativeint, nativeint>
interface IMultiplicativeIdentity<nativeint, nativeint>
interface IMultiplyOperators<nativeint, nativeint, nativeint>
interface INumber<nativeint>
interface INumberBase<nativeint>
interface ISubtractionOperators<nativeint, nativeint, nativeint>
interface IUnaryNegationOperators<nativeint, nativeint>
interface IUnaryPlusOperators<nativeint, nativeint>
interface IShiftOperators<nativeint, int, nativeint>
interface IMinMaxValue<nativeint>
interface ISignedNumber<nativeint>
interface ISerializable
type nativeint = struct
interface IFormattable
interface IParsable<nativeint>
interface ISpanFormattable
interface ISpanParsable<nativeint>
interface IAdditionOperators<nativeint, nativeint, nativeint>
interface IAdditiveIdentity<nativeint, nativeint>
interface IBinaryInteger<nativeint>
interface IBinaryNumber<nativeint>
interface IBitwiseOperators<nativeint, nativeint, nativeint>
interface IComparisonOperators<nativeint, nativeint, bool>
interface IEqualityOperators<nativeint, nativeint, bool>
interface IDecrementOperators<nativeint>
interface IDivisionOperators<nativeint, nativeint, nativeint>
interface IIncrementOperators<nativeint>
interface IModulusOperators<nativeint, nativeint, nativeint>
interface IMultiplicativeIdentity<nativeint, nativeint>
interface IMultiplyOperators<nativeint, nativeint, nativeint>
interface INumber<nativeint>
interface INumberBase<nativeint>
interface ISubtractionOperators<nativeint, nativeint, nativeint>
interface IUnaryNegationOperators<nativeint, nativeint>
interface IUnaryPlusOperators<nativeint, nativeint>
interface IUtf8SpanFormattable
interface IUtf8SpanParsable<nativeint>
interface IShiftOperators<nativeint, int, nativeint>
interface IMinMaxValue<nativeint>
interface ISignedNumber<nativeint>
interface ISerializable
type nativeint = struct
interface ISerializable
[<System.Serializable>]
type nativeint = struct
interface ISerializable
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type nativeint = struct
interface ISerializable
Public Structure IntPtr
Public Structure IntPtr
Implements IAdditionOperators(Of IntPtr, IntPtr, IntPtr), IAdditiveIdentity(Of IntPtr, IntPtr), IBinaryInteger(Of IntPtr), IBinaryNumber(Of IntPtr), IBitwiseOperators(Of IntPtr, IntPtr, IntPtr), IComparable(Of IntPtr), IComparisonOperators(Of IntPtr, IntPtr, Boolean), IDecrementOperators(Of IntPtr), IDivisionOperators(Of IntPtr, IntPtr, IntPtr), IEqualityOperators(Of IntPtr, IntPtr, Boolean), IEquatable(Of IntPtr), IIncrementOperators(Of IntPtr), IMinMaxValue(Of IntPtr), IModulusOperators(Of IntPtr, IntPtr, IntPtr), IMultiplicativeIdentity(Of IntPtr, IntPtr), IMultiplyOperators(Of IntPtr, IntPtr, IntPtr), INumber(Of IntPtr), INumberBase(Of IntPtr), IParsable(Of IntPtr), ISerializable, IShiftOperators(Of IntPtr, Integer, IntPtr), ISignedNumber(Of IntPtr), ISpanParsable(Of IntPtr), ISubtractionOperators(Of IntPtr, IntPtr, IntPtr), IUnaryNegationOperators(Of IntPtr, IntPtr), IUnaryPlusOperators(Of IntPtr, IntPtr), IUtf8SpanParsable(Of IntPtr)
Public Structure IntPtr
Implements IComparable, IComparable(Of IntPtr), IEquatable(Of IntPtr), IFormattable, ISerializable
Public Structure IntPtr
Implements IComparable, IComparable(Of IntPtr), IEquatable(Of IntPtr), ISerializable, ISpanFormattable
Public Structure IntPtr
Implements IAdditionOperators(Of IntPtr, IntPtr, IntPtr), IAdditiveIdentity(Of IntPtr, IntPtr), IBinaryInteger(Of IntPtr), IBinaryNumber(Of IntPtr), IBitwiseOperators(Of IntPtr, IntPtr, IntPtr), IComparable(Of IntPtr), IComparisonOperators(Of IntPtr, IntPtr, Boolean), IDecrementOperators(Of IntPtr), IDivisionOperators(Of IntPtr, IntPtr, IntPtr), IEqualityOperators(Of IntPtr, IntPtr, Boolean), IEquatable(Of IntPtr), IIncrementOperators(Of IntPtr), IMinMaxValue(Of IntPtr), IModulusOperators(Of IntPtr, IntPtr, IntPtr), IMultiplicativeIdentity(Of IntPtr, IntPtr), IMultiplyOperators(Of IntPtr, IntPtr, IntPtr), INumber(Of IntPtr), INumberBase(Of IntPtr), IParsable(Of IntPtr), ISerializable, IShiftOperators(Of IntPtr, Integer, IntPtr), ISignedNumber(Of IntPtr), ISpanParsable(Of IntPtr), ISubtractionOperators(Of IntPtr, IntPtr, IntPtr), IUnaryNegationOperators(Of IntPtr, IntPtr), IUnaryPlusOperators(Of IntPtr, IntPtr)
Public Structure IntPtr
Implements IEquatable(Of IntPtr), ISerializable
Public Structure IntPtr
Implements ISerializable
- 繼承
- 屬性
- 實作
-
IComparable IComparable<IntPtr> IComparable<TSelf> IEquatable<IntPtr> IEquatable<TSelf> IFormattable IParsable<IntPtr> IParsable<TSelf> ISpanFormattable ISpanParsable<IntPtr> ISpanParsable<TSelf> IUtf8SpanFormattable IUtf8SpanParsable<IntPtr> IUtf8SpanParsable<TSelf> IAdditionOperators<IntPtr,IntPtr,IntPtr> IAdditionOperators<TSelf,TSelf,TSelf> IAdditiveIdentity<IntPtr,IntPtr> IAdditiveIdentity<TSelf,TSelf> IBinaryInteger<IntPtr> IBinaryNumber<IntPtr> IBinaryNumber<TSelf> IBitwiseOperators<IntPtr,IntPtr,IntPtr> IBitwiseOperators<TSelf,TSelf,TSelf> IComparisonOperators<IntPtr,IntPtr,Boolean> IComparisonOperators<TSelf,TSelf,Boolean> IDecrementOperators<IntPtr> IDecrementOperators<TSelf> IDivisionOperators<IntPtr,IntPtr,IntPtr> IDivisionOperators<TSelf,TSelf,TSelf> IEqualityOperators<IntPtr,IntPtr,Boolean> IEqualityOperators<TSelf,TOther,TResult> IEqualityOperators<TSelf,TSelf,Boolean> IIncrementOperators<IntPtr> IIncrementOperators<TSelf> IMinMaxValue<IntPtr> IModulusOperators<IntPtr,IntPtr,IntPtr> IModulusOperators<TSelf,TSelf,TSelf> IMultiplicativeIdentity<IntPtr,IntPtr> IMultiplicativeIdentity<TSelf,TSelf> IMultiplyOperators<IntPtr,IntPtr,IntPtr> IMultiplyOperators<TSelf,TSelf,TSelf> INumber<IntPtr> INumber<TSelf> INumberBase<IntPtr> INumberBase<TSelf> IShiftOperators<IntPtr,Int32,IntPtr> IShiftOperators<TSelf,Int32,TSelf> ISignedNumber<IntPtr> ISubtractionOperators<IntPtr,IntPtr,IntPtr> ISubtractionOperators<TSelf,TSelf,TSelf> IUnaryNegationOperators<IntPtr,IntPtr> IUnaryNegationOperators<TSelf,TSelf> IUnaryPlusOperators<IntPtr,IntPtr> IUnaryPlusOperators<TSelf,TSelf> ISerializable
範例
下列範例會使用Managed指標來反轉數位列中的字元。 初始化物件 String 並取得長度後,會執行以下操作:
呼叫 Marshal.StringToHGlobalAnsi 將 Unicode 字串以 ANSI(單位元組)字元複製到非管理記憶體的方法。 該方法回傳一個 IntPtr 指向未管理字串起始點的物件。 Visual Basic 範例會直接使用此指標;在 C++、F# 和 C# 範例中,它會轉換成位元組的指標。
呼叫 Marshal.AllocHGlobal 方法以分配與未管理字串所佔位元組相同的位元組數。 該方法回傳一個 IntPtr 指向未管理記憶體區塊起始點的物件。 Visual Basic 範例會直接使用此指標;在 C++、F# 和 C# 範例中,它會轉換成位元組的指標。
Visual Basic 範例定義了一個名為
offset的變數,該變數等於 ANSI 字串的長度。 它用來判斷將 ANSI 字串中下一個字元複製到 Unmanaged 記憶體中的位移。 因為其起始值是字串的長度,因此複製作業會將字元從字串開頭複製到記憶體區塊的結尾。C#、F# 和 C++ 範例 ToPointer 呼叫該方法取得字串起始位址與記憶體區塊的非管理指標,並對 ANSI 字串的起始位址加一個字串長度。 由於 Unmanaged 字串指標現在指向字串的結尾,因此複製作業會將字元從字串結尾複製到記憶體區塊的開頭。
使用 迴圈,將每個字元從字串複製到記憶體的 Unmanaged 區塊。
Visual Basic 範例呼叫 Marshal.ReadByte(IntPtr, Int32) 方法,從管理指標到 ANSI 字串的指定偏移量讀取位元組(或一位元組字元)。 位移會隨著迴圈的每個反覆專案而遞增。 接著它呼叫 Marshal.WriteByte(IntPtr, Int32, Byte) 該位元組寫入由未管理記憶體區塊
offset起始位址加 所定義的記憶體位址。 接著會offset遞減。C#、F# 和 C++ 範例會執行複製作業,然後將 Unmanaged ANSI 字串中下一個位置的位址指標遞減,並將指標遞增至 Unmanaged 區塊中的下一個位址。
所有範例都呼叫將 Marshal.PtrToStringAnsi 包含複製 ANSI 字串的未管理記憶體區塊轉換為受管理的 Unicode String 物件。
在顯示原始字串與反向字串後,所有範例都會呼叫該 FreeHGlobal 方法以釋放分配給非管理 ANSI 字串及非管理記憶體區塊的記憶體。
using namespace System;
using namespace System::Runtime::InteropServices;
class NotTooSafeStringReverse
{
public:
static void Main()
{
String^ stringA = "I seem to be turned around!";
int copylen = stringA->Length;
// Allocate HGlobal memory for source and destination strings
IntPtr sptr = Marshal::StringToHGlobalAnsi(stringA);
IntPtr dptr = Marshal::AllocHGlobal(copylen + 1);
char *src = (char *)sptr.ToPointer();
char *dst = (char *)dptr.ToPointer();
if (copylen > 0)
{
// set the source pointer to the end of the string
// to do a reverse copy.
src += copylen - 1;
while (copylen-- > 0)
{
*dst++ = *src--;
}
*dst = 0;
}
String^ stringB = Marshal::PtrToStringAnsi(dptr);
Console::WriteLine("Original:\n{0}\n", stringA);
Console::WriteLine("Reversed:\n{0}", stringB);
// Free HGlobal memory
Marshal::FreeHGlobal(dptr);
Marshal::FreeHGlobal(sptr);
}
};
int main()
{
NotTooSafeStringReverse::Main();
}
// The progam has the following output:
//
// Original:
// I seem to be turned around!
//
// Reversed:
// !dnuora denrut eb ot mees I
using System;
using System.Runtime.InteropServices;
class NotTooSafeStringReverse
{
static public void Main()
{
string stringA = "I seem to be turned around!";
int copylen = stringA.Length;
// Allocate HGlobal memory for source and destination strings
IntPtr sptr = Marshal.StringToHGlobalAnsi(stringA);
IntPtr dptr = Marshal.AllocHGlobal(copylen + 1);
// The unsafe section where byte pointers are used.
unsafe
{
byte *src = (byte *)sptr.ToPointer();
byte *dst = (byte *)dptr.ToPointer();
if (copylen > 0)
{
// set the source pointer to the end of the string
// to do a reverse copy.
src += copylen - 1;
while (copylen-- > 0)
{
*dst++ = *src--;
}
*dst = 0;
}
}
string stringB = Marshal.PtrToStringAnsi(dptr);
Console.WriteLine("Original:\n{0}\n", stringA);
Console.WriteLine("Reversed:\n{0}", stringB);
// Free HGlobal memory
Marshal.FreeHGlobal(dptr);
Marshal.FreeHGlobal(sptr);
}
}
// The progam has the following output:
//
// Original:
// I seem to be turned around!
//
// Reversed:
// !dnuora denrut eb ot mees I
#nowarn "9"
open System.Runtime.InteropServices
open FSharp.NativeInterop
[<EntryPoint>]
let main _ =
let stringA = "I seem to be turned around!"
let mutable copylen = stringA.Length
// Allocate HGlobal memory for source and destination strings
let sptr = Marshal.StringToHGlobalAnsi stringA
let dptr = Marshal.AllocHGlobal(copylen + 1)
let mutable src: byte nativeptr = sptr.ToPointer() |> NativePtr.ofVoidPtr
let mutable dst: byte nativeptr = dptr.ToPointer() |> NativePtr.ofVoidPtr
if copylen > 0 then
// set the source pointer to the end of the string
// to do a reverse copy.
src <-
NativePtr.toNativeInt src + nativeint (copylen - 1)
|> NativePtr.ofNativeInt
while copylen > 0 do
copylen <- copylen - 1
NativePtr.read src |> NativePtr.write dst
dst <- NativePtr.toNativeInt dst + 1n |> NativePtr.ofNativeInt
src <- NativePtr.toNativeInt src - 1n |> NativePtr.ofNativeInt
NativePtr.write dst 0uy
let stringB = Marshal.PtrToStringAnsi dptr
printfn $"Original:\n{stringA}\n"
printfn $"Reversed:\n{stringB}"
// Free HGlobal memory
Marshal.FreeHGlobal dptr
Marshal.FreeHGlobal sptr
0
// The progam has the following output:
//
// Original:
// I seem to be turned around!
//
// Reversed:
// !dnuora denrut eb ot mees I
Imports System.Runtime.InteropServices
Public Module Example
Public Sub Main()
Dim stringA As String = "I seem to be turned around!"
Dim copylen As Integer = stringA.Length
' Allocate HGlobal memory for source and destination strings
Dim sptr As IntPtr = Marshal.StringToHGlobalAnsi(stringA)
Dim dptr As IntPtr = Marshal.AllocHGlobal(copylen)
Dim offset As Integer = copylen - 1
For ctr As Integer = 0 To copylen - 1
Dim b As Byte = Marshal.ReadByte(sptr, ctr)
Marshal.WriteByte(dptr, offset, b)
offset -= 1
Next
Dim stringB As String = Marshal.PtrToStringAnsi(dptr)
Console.WriteLine("Original:{1}{0}{1}", stringA, vbCrLf)
Console.WriteLine("Reversed:{1}{0}{1}", stringB, vbCrLf)
' Free HGlobal memory
Marshal.FreeHGlobal(dptr)
Marshal.FreeHGlobal(sptr)
End Sub
End Module
' The example displays the following output:
' Original:
' I seem to be turned around!
'
' Reversed:
' !dnuora denrut eb ot mees I
備註
該 IntPtr 型別設計為大小與指標相同的整數。 也就是說,此類型的實例預期為32位進程中的32位,而64位進程則為64位。
此 IntPtr 型別可用於支援指標的語言,並作為支援指標與不支援指標的語言間共同參考資料的方式。
IntPtr 物品也可以用來握把手。 例如,在類別中大量使用 System.IO.FileStream 的IntPtr實例來保存檔案的句柄。
注意
作為 IntPtr 指標或柄使用容易出錯且不安全。 它只是整數類型,因為大小相同,可用來做為指標和句柄的交換格式。 除了特定交換需求外,例如將資料傳遞給不支援指標的語言,應該使用正確型別的指標來表示指標,並 SafeHandle 用來表示句柄。
此類型實 ISerializable作 。 在 .NET 5 及以後版本中,此類型也實作了 IFormattable 介面。 在 .NET 7 及以後版本中,此類型也實作了 IBinaryInteger<TSelf>、IMinMaxValue<TSelf> 以及 ISignedNumber<TSelf> 介面。
在 C# 從 9.0 版本開始,你可以使用內建 nint 型別來定義原生大小的整數。 此型別由 IntPtr 內部型別表示,並提供適合整數型別的操作與轉換。 更多資訊請參見 nint 和 nuint 類型。
在 C# 從版本 11 開始,針對 .NET 7 或更新執行時,nint 是 IntPtr 的別名,就像 int 是 Int32 的別名一樣。
建構函式
| 名稱 | Description |
|---|---|
| IntPtr(Int32) |
初始化一個使用指定 32 位元有符號整數的新實例 IntPtr 。 |
| IntPtr(Int64) |
初始化使用指定 64 位元有號整數的新實例 IntPtr 。 |
| IntPtr(Void*) |
初始化使用指定指標指向未指定型態的新實例 IntPtr 。 |
欄位
| 名稱 | Description |
|---|---|
| Zero |
只讀欄位,表示已初始化為零的帶正負號整數。 |
屬性
| 名稱 | Description |
|---|---|
| MaxValue |
得到最大可能的值。IntPtr |
| MinValue |
得到最小的值。IntPtr |
| Size |
取得這個實例的大小。 |
方法
操作員
| 名稱 | Description |
|---|---|
| Addition(IntPtr, Int32) |
將位移加入帶正負號的整數。 |
| Equality(IntPtr, IntPtr) |
判斷兩個指定的 實 IntPtr 例是否相等。 |
| Explicit(Int32 to IntPtr) |
將一個 32 位元有符號整數 IntPtr的值轉換為 。 |
| Explicit(Int64 to IntPtr) |
將一個 64 位元有符號整數 IntPtr的值轉換為 。 |
| Explicit(IntPtr to Int32) |
將指定的 IntPtr 值轉換為 32 位元有符號整數。 |
| Explicit(IntPtr to Int64) |
將指定的 IntPtr 值轉換為 64 位元有符號整數。 |
| Explicit(IntPtr to Void*) |
將指定的 IntPtr 值轉換為未指定型別的指標。 此 API 不符合 CLS 標準。 |
| Explicit(Void* to IntPtr) |
將指定的指標轉換為未指定型態。IntPtr 此 API 不符合 CLS 標準。 |
| Inequality(IntPtr, IntPtr) |
判斷兩個指定的 實 IntPtr 例是否不相等。 |
| Subtraction(IntPtr, Int32) |
從帶正負號的整數減去位移。 |
明確介面實作
適用於
執行緒安全性
此類型是安全線程。