Marshal.ReadIntPtr 方法

定义

命名空间:: System.Runtime.InteropServices

程序集:: mscorlib.dll, System.Runtime.InteropServices.dll

程序集:: netstandard.dll, System.Runtime.InteropServices.dll

程序集:: System.Runtime.InteropServices.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

从非托管内存中读取处理器本机大小的整数。支持从未对齐的内存位置读取。

重载

名称	说明
ReadIntPtr(IntPtr, Int32)	从非托管内存的给定偏移量读取处理器本机大小的整数。
ReadIntPtr(Object, Int32)	已过时. 从非托管内存中读取处理器本机大小的整数。
ReadIntPtr(IntPtr)	从非托管内存中读取处理器本机大小的整数。

ReadIntPtr(IntPtr, Int32)

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

从非托管内存的给定偏移量读取处理器本机大小的整数。

public:
 static IntPtr ReadIntPtr(IntPtr ptr, int ofs);

[System.Security.SecurityCritical]
public static IntPtr ReadIntPtr(IntPtr ptr, int ofs);

public static IntPtr ReadIntPtr(IntPtr ptr, int ofs);

[<System.Security.SecurityCritical>]
static member ReadIntPtr : nativeint * int -> nativeint

static member ReadIntPtr : nativeint * int -> nativeint

Public Shared Function ReadIntPtr (ptr As IntPtr, ofs As Integer) As IntPtr

参数

ptr: IntPtr
nativeint

要从中读取的非托管内存中的基址。

ofs: Int32

另一个字节偏移量，该偏移量在读取之前添加到 ptr 参数中。

IntPtr

nativeint

从给定偏移量的非托管内存中读取的整数。

属性: SecurityCriticalAttribute

例外

AccessViolationException

基址（ptr）加上偏移字节（ofs）生成 null 或无效地址。

示例

以下示例演示如何使用 ReadIntPtr and WriteIntPtr 方法读取和写入非托管数组。

static void ReadWriteIntPtr()
{
    // Allocate unmanaged memory. 
    int elementSize = Marshal.SizeOf(typeof(IntPtr));
    IntPtr unmanagedArray = Marshal.AllocHGlobal(10 * elementSize);

    // Set the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Marshal.WriteIntPtr(unmanagedArray, i * elementSize, ((IntPtr)(i + 1)));
    }
    Console.WriteLine("Unmanaged memory written.");

    Console.WriteLine("Reading unmanaged memory:");
    // Print the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Console.WriteLine(Marshal.ReadIntPtr(unmanagedArray, i * elementSize));
    }

    Marshal.FreeHGlobal(unmanagedArray);

    Console.WriteLine("Done. Press Enter to continue.");
    Console.ReadLine();
}

Sub ReadWriteIntPtr()
    ' Allocate unmanaged memory.
    Dim elementSize As Integer = Marshal.SizeOf(GetType(IntPtr))
    Dim unmanagedArray As IntPtr = Marshal.AllocHGlobal(10 * elementSize)

    ' Set the 10 elements of the C-style unmanagedArray
    For i As Integer = 0 To 9
        Marshal.WriteIntPtr(unmanagedArray, i * elementSize, CType(i + 1, IntPtr))
    Next i
    Console.WriteLine("Unmanaged memory written.")

    Console.WriteLine("Reading unmanaged memory:")
    ' Print the 10 elements of the C-style unmanagedArray
    For i As Integer = 0 To 9
        Console.WriteLine(Marshal.ReadIntPtr(unmanagedArray, i * elementSize))
    Next i

    Marshal.FreeHGlobal(unmanagedArray)

    Console.WriteLine("Done. Press Enter to continue.")
    Console.ReadLine()
End Sub

注解

ReadIntPtr 启用与非托管 C 样式 IntPtr 数组的直接交互，从而消除了在读取其元素值之前将整个非托管数组（using Marshal.Copy）复制到单独的托管数组的费用。

支持从未对齐的内存位置读取。

另请参阅

适用于

ReadIntPtr(Object, Int32)

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

注意

ReadIntPtr(Object, Int32) may be unavailable in future releases.

从非托管内存中读取处理器本机大小的整数。

public:
 static IntPtr ReadIntPtr(System::Object ^ ptr, int ofs);

[System.Obsolete("ReadIntPtr(Object, Int32) may be unavailable in future releases.")]
[System.Security.SecurityCritical]
public static IntPtr ReadIntPtr(object ptr, int ofs);

[System.Obsolete("ReadIntPtr(Object, Int32) may be unavailable in future releases.")]
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Marshalling code for the object might not be available")]
public static IntPtr ReadIntPtr(object ptr, int ofs);

[System.Obsolete("ReadIntPtr(Object, Int32) may be unavailable in future releases.")]
public static IntPtr ReadIntPtr(object ptr, int ofs);

public static IntPtr ReadIntPtr(object ptr, int ofs);

[System.Security.SecurityCritical]
public static IntPtr ReadIntPtr(object ptr, int ofs);

[<System.Obsolete("ReadIntPtr(Object, Int32) may be unavailable in future releases.")>]
[<System.Security.SecurityCritical>]
static member ReadIntPtr : obj * int -> nativeint

[<System.Obsolete("ReadIntPtr(Object, Int32) may be unavailable in future releases.")>]
[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Marshalling code for the object might not be available")>]
static member ReadIntPtr : obj * int -> nativeint

[<System.Obsolete("ReadIntPtr(Object, Int32) may be unavailable in future releases.")>]
static member ReadIntPtr : obj * int -> nativeint

static member ReadIntPtr : obj * int -> nativeint

[<System.Security.SecurityCritical>]
static member ReadIntPtr : obj * int -> nativeint

Public Shared Function ReadIntPtr (ptr As Object, ofs As Integer) As IntPtr

参数

ptr: Object

源对象的非托管内存中的基址。

ofs: Int32

另一个字节偏移量，该偏移量在读取之前添加到 ptr 参数中。

IntPtr

nativeint

从给定偏移量的非托管内存中读取的整数。

属性: ObsoleteAttribute SecurityCriticalAttribute RequiresDynamicCodeAttribute

例外

AccessViolationException

基址（ptr）加上偏移字节（ofs）生成 null 或无效地址。

ArgumentException

ptr 是一个 ArrayWithOffset 对象。此方法不接受 ArrayWithOffset 参数。

注解

支持从未对齐的内存位置读取。

另请参阅

Copy(Int32[], Int32, IntPtr, Int32)

适用于

ReadIntPtr(IntPtr)

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

从非托管内存中读取处理器本机大小的整数。

public:
 static IntPtr ReadIntPtr(IntPtr ptr);

[System.Security.SecurityCritical]
public static IntPtr ReadIntPtr(IntPtr ptr);

public static IntPtr ReadIntPtr(IntPtr ptr);

[<System.Security.SecurityCritical>]
static member ReadIntPtr : nativeint -> nativeint

static member ReadIntPtr : nativeint -> nativeint

Public Shared Function ReadIntPtr (ptr As IntPtr) As IntPtr

参数

ptr: IntPtr
nativeint

要从中读取的非托管内存中的地址。

IntPtr

nativeint

从非托管内存中读取的整数。 32 位计算机上返回 32 位整数，64 位计算机上返回 64 位整数。

属性: SecurityCriticalAttribute

例外

AccessViolationException

ptr 不是可识别的格式。

-或-

ptr 是 null。

-或-

ptr 无效。

示例

以下示例演示如何使用 ReadIntPtr and WriteIntPtr 方法读取和写入非托管数组。

static void ReadWriteIntPtr()
{
    // Allocate unmanaged memory. 
    int elementSize = Marshal.SizeOf(typeof(IntPtr));
    IntPtr unmanagedArray = Marshal.AllocHGlobal(10 * elementSize);

    // Set the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Marshal.WriteIntPtr(unmanagedArray, i * elementSize, ((IntPtr)(i + 1)));
    }
    Console.WriteLine("Unmanaged memory written.");

    Console.WriteLine("Reading unmanaged memory:");
    // Print the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Console.WriteLine(Marshal.ReadIntPtr(unmanagedArray, i * elementSize));
    }

    Marshal.FreeHGlobal(unmanagedArray);

    Console.WriteLine("Done. Press Enter to continue.");
    Console.ReadLine();
}

Sub ReadWriteIntPtr()
    ' Allocate unmanaged memory.
    Dim elementSize As Integer = Marshal.SizeOf(GetType(IntPtr))
    Dim unmanagedArray As IntPtr = Marshal.AllocHGlobal(10 * elementSize)

    ' Set the 10 elements of the C-style unmanagedArray
    For i As Integer = 0 To 9
        Marshal.WriteIntPtr(unmanagedArray, i * elementSize, CType(i + 1, IntPtr))
    Next i
    Console.WriteLine("Unmanaged memory written.")

    Console.WriteLine("Reading unmanaged memory:")
    ' Print the 10 elements of the C-style unmanagedArray
    For i As Integer = 0 To 9
        Console.WriteLine(Marshal.ReadIntPtr(unmanagedArray, i * elementSize))
    Next i

    Marshal.FreeHGlobal(unmanagedArray)

    Console.WriteLine("Done. Press Enter to continue.")
    Console.ReadLine()
End Sub

注解

ReadIntPtr 具有 0 的默示偏移量。此方法可实现与非托管 C 样式 IntPtr 数组的直接交互，从而消除了在读取其元素值之前将整个非托管数组（使用 Marshal.Copy）复制到单独的托管数组的费用。

支持从未对齐的内存位置读取。

另请参阅

Copy(Int32[], Int32, IntPtr, Int32)

适用于

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