Marshal.WriteByte 方法

定義

命名空間:

System.Runtime.InteropServices

組件:

System.Runtime.InteropServices.dll

將單一位元組值寫入 Unmanaged 記憶體。

多載

WriteByte(Object, Int32, Byte)	已淘汰. 將單一位元組值寫入 Unmanaged 記憶體中的指定位移。
WriteByte(IntPtr, Byte)	將單一位元組值寫入 Unmanaged 記憶體。
WriteByte(IntPtr, Int32, Byte)	將單一位元組值寫入 Unmanaged 記憶體中的指定位移。

WriteByte(Object, Int32, Byte)

來源:

Marshal.CoreCLR.cs

警告

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

將單一位元組值寫入 Unmanaged 記憶體中的指定位移。

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

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

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

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

參數

ptr

Object

目標物件之 Unmanaged 記憶體中的基底位址。

ofs

Int32

額外的位元組位移，會先加入至參數 ptr，然後再進行寫入。

val

Byte

要寫入的值。

屬性

ObsoleteAttribute

例外狀況

AccessViolationException

基底位址 (ptr) 加上位移位元組 (ofs) 會產生 Null 或無效的位址。

ArgumentException

ptr 是 ArrayWithOffset 物件。 這個方法不會接受 ArrayWithOffset 參數。

備註

WriteByte 可讓您直接與 Unmanaged C 樣式的位元組陣列互動，避免使用 Marshal.Copy) 將整個 Unmanaged 陣列複製到個別 Managed 陣列，再設定其元素值之前，先將整個 Unmanaged 陣列複製到 (。

另請參閱

• Copy(Int32[], Int32, IntPtr, Int32)

WriteByte(IntPtr, Byte)

來源:

Marshal.cs

將單一位元組值寫入 Unmanaged 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

Unmanaged 記憶體中要寫入的位址。

val

Byte

要寫入的值。

例外狀況

AccessViolationException

ptr 不是可辨認的格式。

-或-

ptr 為 null。

-或-

ptr 無效。

範例

下列範例會建立 Unmanaged 記憶體區塊、將位元組寫入 Unmanaged 記憶體、從 Unmanaged 記憶體讀取位元元組，然後處置 Unmanaged 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 可讓您直接與 Unmanaged C 樣式的位元組陣列互動，避免使用 Marshal.Copy) 將整個 Unmanaged 陣列複製到個別 Managed 陣列，再設定其元素值之前，先將整個 Unmanaged 陣列複製到 (。

另請參閱

• Copy(Int32[], Int32, IntPtr, Int32)

WriteByte(IntPtr, Int32, Byte)

來源:

Marshal.cs

將單一位元組值寫入 Unmanaged 記憶體中的指定位移。

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

Unmanaged 記憶體中要寫入的基底位址。

ofs

Int32

額外的位元組位移，會先加入至參數 ptr，然後再進行寫入。

val

Byte

要寫入的值。

例外狀況

AccessViolationException

基底位址 (ptr) 加上位移位元組 (ofs) 會產生 Null 或無效的位址。

範例

下列範例示範如何使用 和 WriteByte 方法來讀取和寫入 Unmanaged 陣列ReadByte。

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 可讓您直接與 Unmanaged C 樣式的位元組陣列互動，避免使用 Marshal.Copy) 將整個 Unmanaged 陣列複製到個別 Managed 陣列，再設定其元素值之前，先將整個 Unmanaged 陣列複製到 (。

另請參閱

• Copy(Int32[], Int32, IntPtr, Int32)