Marshal.ReadInt16 方法

参考

定义

命名空间:: System.Runtime.InteropServices

程序集:: System.Runtime.InteropServices.dll

程序集:: mscorlib.dll

程序集:: netstandard.dll

重要

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从非托管内存中读取 16 位有符号整数。支持从未对齐的内存位置读取。

重载

ReadInt16(IntPtr)	从非托管内存中读取 16 位有符号整数。
ReadInt16(IntPtr, Int32)	从非托管内存的给定偏移量读取 16 位有符号整数。
ReadInt16(Object, Int32)	已过时. 从非托管内存的给定偏移量读取 16 位有符号整数。

ReadInt16(IntPtr)

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

从非托管内存中读取 16 位有符号整数。

public:
 static short ReadInt16(IntPtr ptr);

[System.Security.SecurityCritical]
public static short ReadInt16 (IntPtr ptr);

public static short ReadInt16 (IntPtr ptr);

[<System.Security.SecurityCritical>]
static member ReadInt16 : nativeint -> int16

static member ReadInt16 : nativeint -> int16

Public Shared Function ReadInt16 (ptr As IntPtr) As Short

参数

ptr: IntPtr
nativeint

要从中读取的非托管内存中的地址。

Int16

从非托管内存中读取的 16 位有符号整数。

属性: SecurityCriticalAttribute

例外

AccessViolationException

ptr 不是可识别的格式。

-或-

ptr null。

-或-

ptr 无效。

示例

以下示例演示如何使用 ReadInt16 和 WriteInt16 方法读取和写入非托管数组。

static void ReadWriteInt16()
{
    // Allocate unmanaged memory. 
    int elementSize = 2;
    IntPtr unmanagedArray = Marshal.AllocHGlobal(10 * elementSize);

    // Set the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Marshal.WriteInt16(unmanagedArray, i * elementSize, ((Int16)(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.ReadInt16(unmanagedArray, i * elementSize));
    }

    Marshal.FreeHGlobal(unmanagedArray);

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

Sub ReadWriteInt16()
    ' Allocate unmanaged memory. 
    Dim elementSize As Integer = 2
    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.WriteInt16(unmanagedArray, i * elementSize, CType(i + 1, Int16))
    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.ReadInt16(unmanagedArray, i * elementSize))
    Next i

    Marshal.FreeHGlobal(unmanagedArray)

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

以下示例演示如何使用 ReadInt16 方法读取非托管 short 变量的值。


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



void main()
{
    // Create an unmanaged short.
    short myShort = 42;

    // Read the short as a managed Int16.
        Int16 ^ myManagedVal = Marshal::ReadInt16((IntPtr) &myShort);

    // Display the value to the console.
    Console::WriteLine(myManagedVal);
}

注解

ReadInt16 隐含偏移量为 0。此方法允许与非托管 C 样式 Int16 数组进行直接交互，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

ReadInt16(IntPtr, Int32)

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

从非托管内存的给定偏移量读取 16 位有符号整数。

public:
 static short ReadInt16(IntPtr ptr, int ofs);

[System.Security.SecurityCritical]
public static short ReadInt16 (IntPtr ptr, int ofs);

public static short ReadInt16 (IntPtr ptr, int ofs);

[<System.Security.SecurityCritical>]
static member ReadInt16 : nativeint * int -> int16

static member ReadInt16 : nativeint * int -> int16

Public Shared Function ReadInt16 (ptr As IntPtr, ofs As Integer) As Short

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。

Int16

从给定偏移量的非托管内存中读取的 16 位有符号整数。

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 ReadInt16 和 WriteInt16 方法读取和写入非托管数组。

static void ReadWriteInt16()
{
    // Allocate unmanaged memory. 
    int elementSize = 2;
    IntPtr unmanagedArray = Marshal.AllocHGlobal(10 * elementSize);

    // Set the 10 elements of the C-style unmanagedArray
    for (int i = 0; i < 10; i++)
    {
        Marshal.WriteInt16(unmanagedArray, i * elementSize, ((Int16)(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.ReadInt16(unmanagedArray, i * elementSize));
    }

    Marshal.FreeHGlobal(unmanagedArray);

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

Sub ReadWriteInt16()
    ' Allocate unmanaged memory. 
    Dim elementSize As Integer = 2
    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.WriteInt16(unmanagedArray, i * elementSize, CType(i + 1, Int16))
    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.ReadInt16(unmanagedArray, i * elementSize))
    Next i

    Marshal.FreeHGlobal(unmanagedArray)

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

以下示例演示如何使用 ReadInt16 方法读取非托管 short 变量的值。


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

void main()
{
    // Create an unmanaged short pointer.
    short * myShort;
    short tmp = 42;
    // Initialize it to another value.
    myShort = &tmp;

    // Read value as a managed Int16.
    Int16 ^ myManagedVal = Marshal::ReadInt16((IntPtr) myShort, 0);

    // Display the value to the console.
    Console::WriteLine(myManagedVal);
}

注解

ReadInt16 支持与非托管 16 位带符号数组的直接交互，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

适用于

ReadInt16(Object, Int32)

Source:: Marshal.CoreCLR.cs

Source:: Marshal.CoreCLR.cs

Source:: Marshal.CoreCLR.cs

注意

ReadInt16(Object, Int32) may be unavailable in future releases.

从非托管内存的给定偏移量读取 16 位有符号整数。

public:
 static short ReadInt16(System::Object ^ ptr, int ofs);

[System.Obsolete("ReadInt16(Object, Int32) may be unavailable in future releases.")]
[System.Security.SecurityCritical]
public static short ReadInt16 (object ptr, int ofs);

[System.Obsolete("ReadInt16(Object, Int32) may be unavailable in future releases.")]
public static short ReadInt16 (object ptr, int ofs);

public static short ReadInt16 (object ptr, int ofs);

[System.Security.SecurityCritical]
public static short ReadInt16 (object ptr, int ofs);

[<System.Obsolete("ReadInt16(Object, Int32) may be unavailable in future releases.")>]
[<System.Security.SecurityCritical>]
static member ReadInt16 : obj * int -> int16

[<System.Obsolete("ReadInt16(Object, Int32) may be unavailable in future releases.")>]
static member ReadInt16 : obj * int -> int16

static member ReadInt16 : obj * int -> int16

[<System.Security.SecurityCritical>]
static member ReadInt16 : obj * int -> int16

Public Shared Function ReadInt16 (ptr As Object, ofs As Integer) As Short

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。

Int16

从给定偏移量的非托管内存中读取的 16 位有符号整数。

属性: ObsoleteAttribute SecurityCriticalAttribute

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

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通过

ReadInt16(IntPtr)

参数

返回

例外

示例

注解

另请参阅

适用于

ReadInt16(IntPtr, Int32)

参数

返回

例外

示例

注解

另请参阅

适用于

ReadInt16(Object, Int32)

参数

返回

例外

注解

另请参阅

适用于