Marshal.WriteByte 方法

定義

命名空間:: System.Runtime.InteropServices

組件:: mscorlib.dll, System.Runtime.InteropServices.dll

組件:: netstandard.dll, System.Runtime.InteropServices.dll

組件:: System.Runtime.InteropServices.dll

組件:: mscorlib.dll

組件:: netstandard.dll

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。

將一個位元組的值寫入未管理記憶體。

多載

名稱	Description
WriteByte(Object, Int32, Byte)	已淘汰. 在指定的偏移量處寫入一個位元組的記憶體。
WriteByte(IntPtr, Byte)	將一個位元組的值寫入未管理記憶體。
WriteByte(IntPtr, Int32, Byte)	在指定的偏移量處寫入一個位元組的記憶體。

WriteByte(Object, Int32, Byte)

來源:: Marshal.CoreCLR.cs

來源:: Marshal.CoreCLR.cs

來源:: Marshal.CoreCLR.cs

來源:: Marshal.CoreCLR.cs

來源:: Marshal.CoreCLR.cs

警告

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

在指定的偏移量處寫入一個位元組的記憶體。

public:
 static void WriteByte(System::Object ^ ptr, int ofs, System::Byte val);

[System.Obsolete("WriteByte(Object, Int32, Byte) may be unavailable in future releases.")]
[System.Security.SecurityCritical]
public static void WriteByte(object ptr, int ofs, byte val);

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

[System.Obsolete("WriteByte(Object, Int32, Byte) may be unavailable in future releases.")]
public static void WriteByte(object ptr, int ofs, byte val);

public static void WriteByte(object ptr, int ofs, byte val);

[System.Security.SecurityCritical]
public static void WriteByte(object ptr, int ofs, byte val);

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

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

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

static member WriteByte : obj * int * byte -> unit

[<System.Security.SecurityCritical>]
static member WriteByte : obj * int * byte -> unit

Public Shared Sub WriteByte (ptr As Object, ofs As Integer, val As Byte)

參數

ptr: Object

目標物件在未管理記憶體中的基底位址。

ofs: Int32

一個額外的位元組偏移量，會在寫入參數前加入 ptr 。

val: Byte

要寫入的值。

屬性: ObsoleteAttribute SecurityCriticalAttribute RequiresDynamicCodeAttribute

例外狀況

AccessViolationException

基底位址（ptr）加上偏移位元組（ofs）會產生空位址或無效位址。

ArgumentException

ptr 是一個 ArrayWithOffset 物件。此方法不接受 ArrayWithOffset 參數。

備註

WriteByte 它能直接與非管理的 C 風格位元組陣列互動，省去在設定元素值前先複製整個非管理陣列（使用 Marshal.Copy）到另一個管理陣列的成本。

另請參閱

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

適用於

WriteByte(IntPtr, Byte)

來源:: Marshal.cs

來源:: Marshal.cs

來源:: Marshal.cs

來源:: Marshal.cs

來源:: Marshal.cs

將一個位元組的值寫入未管理記憶體。

public:
 static void WriteByte(IntPtr ptr, System::Byte val);

public static void WriteByte(IntPtr ptr, byte val);

static member WriteByte : nativeint * byte -> unit

Public Shared Sub WriteByte (ptr As IntPtr, val As Byte)

參數

ptr: IntPtr
nativeint

寫入的非管理記憶體位址。

val: Byte

要寫入的值。

例外狀況

AccessViolationException

ptr 並非被認可的格式。

-或-

ptr 是 null。

-或-

ptr 無效。

範例

以下範例建立一個非管理記憶體區塊，寫入一個位元組到該記憶體，再從非管理記憶體讀取該位元組，然後丟棄該非管理記憶體。

using System;
using System.Runtime.InteropServices;

 class Example
 {
     static void Main(string[] args)
     {
          // Allocate 1 byte of unmanaged memory.
          IntPtr hGlobal = Marshal.AllocHGlobal(1);

          // Create a new byte.
          byte b = 1;
          Console.WriteLine("Byte written to unmanaged memory: " + b);

          // Write the byte to unmanaged memory.
          Marshal.WriteByte(hGlobal, b);

          // Read byte from unmanaged memory.
          byte c = Marshal.ReadByte(hGlobal);
          Console.WriteLine("Byte read from unmanaged memory: " + c);

          // Free the unmanaged memory.
          Marshal.FreeHGlobal(hGlobal);
          Console.WriteLine("Unmanaged memory was disposed.");
     }
}

Imports System.Runtime.InteropServices

Module Example
    Sub Main()
         ' Allocate 1 byte of unmanaged memory.
         Dim hGlobal As IntPtr = Marshal.AllocHGlobal(1)
         
         ' Create a new byte.
         Dim b As Byte = 1
         
         Console.WriteLine("Byte written to unmanaged memory: {0}", b)
         
         ' Write the byte to unmanaged memory.
         Marshal.WriteByte(hGlobal, b)
         
         ' Read byte from unmanaged memory.
         Dim c As Byte = Marshal.ReadByte(hGlobal)
         Console.WriteLine("Byte read from unmanaged memory: {0}", c)
         
         ' Free the unmanaged memory.
         Marshal.FreeHGlobal(hGlobal)
         Console.WriteLine("Unmanaged memory was disposed.")
    End Sub
End Module

備註

WriteByte 它能直接與非管理的 C 風格位元組陣列互動，省去在設定元素值前先複製整個非管理陣列（使用 Marshal.Copy）到另一個管理陣列的成本。

另請參閱

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

適用於

WriteByte(IntPtr, Int32, Byte)

來源:: Marshal.cs

來源:: Marshal.cs

來源:: Marshal.cs

來源:: Marshal.cs

來源:: Marshal.cs

在指定的偏移量處寫入一個位元組的記憶體。

public:
 static void WriteByte(IntPtr ptr, int ofs, System::Byte val);

public static void WriteByte(IntPtr ptr, int ofs, byte val);

static member WriteByte : nativeint * int * byte -> unit

Public Shared Sub WriteByte (ptr As IntPtr, ofs As Integer, val As Byte)

參數

ptr: IntPtr
nativeint

寫入的非管理記憶體中的基底位址。

ofs: Int32

一個額外的位元組偏移量，會在寫入參數前加入 ptr 。

val: Byte

要寫入的值。

例外狀況

AccessViolationException

基底位址（ptr）加上偏移位元組（ofs）會產生空位址或無效位址。

範例

以下範例示範如何利用 ReadByte and WriteByte 方法讀寫未管理陣列。

static void ReadWriteByte()
{
    // Allocate unmanaged memory. 
    int elementSize = 1;
    IntPtr unmanagedArray = Marshal.AllocHGlobal(10 * elementSize);

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

    Marshal.FreeHGlobal(unmanagedArray);

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

Sub ReadWriteByte()
    ' Allocate unmanaged memory. 
    Dim elementSize As Integer = 1
    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.WriteByte(unmanagedArray, i * elementSize, CType(i + 1, Byte))
    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.ReadByte(unmanagedArray, i * elementSize))
    Next i

    Marshal.FreeHGlobal(unmanagedArray)

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

備註

WriteByte 它能直接與非管理的 C 風格位元組陣列互動，省去在設定元素值前先複製整個非管理陣列（使用 Marshal.Copy）到另一個管理陣列的成本。

另請參閱

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

適用於

意見反應

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