共用方式為


Marshal.ReadIntPtr 方法

定義

從 Unmanaged 記憶體讀取處理器原生大小的整數。 支援讀取未配置的記憶體位置。

多載

ReadIntPtr(IntPtr, Int32)

從 Unmanaged 記憶體中指定位移處讀取處理器原生大小的整數。

ReadIntPtr(Object, Int32)
已淘汰.

從 Unmanaged 記憶體讀取處理器原生大小的整數。

ReadIntPtr(IntPtr)

從 Unmanaged 記憶體讀取處理器原生大小的整數。

ReadIntPtr(IntPtr, Int32)

來源:
Marshal.cs
來源:
Marshal.cs
來源:
Marshal.cs

從 Unmanaged 記憶體中指定位移處讀取處理器原生大小的整數。

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

參數

ptr
IntPtr

nativeint

從 Unmanaged 記憶體中讀取的基底位址 (Base Address)。

ofs
Int32

額外的位元組位移,會先加入至參數 ptr,然後再進行讀取。

傳回

IntPtr

nativeint

從 Unmanaged 記憶體中指定位移處讀取的整數。

屬性

例外狀況

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 WriteIntPtr 方法來讀取和寫入 Unmanaged 陣列ReadIntPtr

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

備註

ReadIntPtr 可讓您直接與 Unmanaged C 樣式 IntPtr 陣列互動,而不需要先使用 Marshal.Copy) 將整個 Unmanaged 陣列複製到個別 Managed 陣組,再讀取其元素值,即可將整個 Unmanaged 陣列複製 (。

支援讀取未配置的記憶體位置。

另請參閱

適用於

ReadIntPtr(Object, Int32)

來源:
Marshal.cs
來源:
Marshal.cs
來源:
Marshal.cs

警告

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

從 Unmanaged 記憶體讀取處理器原生大小的整數。

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.")]
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.")>]
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

參數

ptr
Object

來源物件之 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,然後再進行讀取。

傳回

IntPtr

nativeint

從 Unmanaged 記憶體中指定位移處讀取的整數。

屬性

例外狀況

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

ptrArrayWithOffset 物件。 這個方法不會接受 ArrayWithOffset 參數。

備註

ReadIntPtr 可讓您直接與 Unmanaged C 樣式 IntPtr 陣列互動,而不需要先使用 Marshal.Copy) 將整個 Unmanaged 陣列複製到個別 Managed 陣組,再讀取其元素值,即可將整個 Unmanaged 陣列複製 (。

支援讀取未配置的記憶體位置。

另請參閱

適用於

ReadIntPtr(IntPtr)

來源:
Marshal.cs
來源:
Marshal.cs
來源:
Marshal.cs

從 Unmanaged 記憶體讀取處理器原生大小的整數。

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

參數

ptr
IntPtr

nativeint

從 Unmanaged 記憶體中讀取的位址。

傳回

IntPtr

nativeint

從 Unmanaged 記憶體讀取的整數。 在 32 位元電腦上會傳回 32 位元整數,而在 64 位元電腦上則會傳回 64 位元整數。

屬性

例外狀況

ptr 不是可辨認的格式。

-或-

ptrnull

-或-

ptr 無效。

範例

下列範例示範如何使用 和 WriteIntPtr 方法來讀取和寫入 Unmanaged 陣列ReadIntPtr

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

備註

ReadIntPtr 具有 0 的隱含位移。 這個方法可讓您直接與 Unmanaged C 樣式 IntPtr 數位互動,避免在讀取其元素值之前,先) 將 Marshal.Copy 整個 Unmanaged 陣組 (複製整個非受控數位列 (。

支援讀取未配置的記憶體位置。

另請參閱

適用於