Marshal.PtrToStructure Método

Source:

Marshal.cs

Source:

Marshal.cs

Source:

Marshal.cs

public:
 static void PtrToStructure(IntPtr ptr, System::Object ^ structure);

[System.Obsolete("PtrToStructure(IntPtr, Object) may be unavailable in future releases. Instead, use PtrToStructure<T>(IntPtr). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296512")]
[System.Security.SecurityCritical]
public static void PtrToStructure (IntPtr ptr, object structure);

public static void PtrToStructure (IntPtr ptr, object structure);

[System.Security.SecurityCritical]
public static void PtrToStructure (IntPtr ptr, object structure);

[System.Runtime.InteropServices.ComVisible(true)]
public static void PtrToStructure (IntPtr ptr, object structure);

[System.Security.SecurityCritical]
[System.Runtime.InteropServices.ComVisible(true)]
public static void PtrToStructure (IntPtr ptr, object structure);

[<System.Obsolete("PtrToStructure(IntPtr, Object) may be unavailable in future releases. Instead, use PtrToStructure<T>(IntPtr). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296512")>]
[<System.Security.SecurityCritical>]
static member PtrToStructure : nativeint * obj -> unit

static member PtrToStructure : nativeint * obj -> unit

[<System.Security.SecurityCritical>]
static member PtrToStructure : nativeint * obj -> unit

[<System.Runtime.InteropServices.ComVisible(true)>]
static member PtrToStructure : nativeint * obj -> unit

[<System.Security.SecurityCritical>]
[<System.Runtime.InteropServices.ComVisible(true)>]
static member PtrToStructure : nativeint * obj -> unit

Public Shared Sub PtrToStructure (ptr As IntPtr, structure As Object)

Parámetros

Atributos

ObsoleteAttribute SecurityCriticalAttribute ComVisibleAttribute

Excepciones

Comentarios

PtrToStructure a menudo es necesario en la interoperabilidad COM e invocación de plataforma cuando los parámetros de estructura se representan como un System.IntPtr valor. No se puede usar este método de sobrecarga con tipos de valor. Si el ptr parámetro es IntPtr.Zeroigual a , null se devolverá.

Source:

Marshal.cs

Source:

Marshal.cs

Source:

Marshal.cs

public:
 static System::Object ^ PtrToStructure(IntPtr ptr, Type ^ structureType);

[System.Obsolete("PtrToStructure(IntPtr, Type) may be unavailable in future releases. Instead, use PtrToStructure<T>(IntPtr). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296513")]
[System.Security.SecurityCritical]
public static object PtrToStructure (IntPtr ptr, Type structureType);

public static object? PtrToStructure (IntPtr ptr, Type structureType);

[System.Security.SecurityCritical]
public static object PtrToStructure (IntPtr ptr, Type structureType);

public static object PtrToStructure (IntPtr ptr, Type structureType);

[System.Runtime.InteropServices.ComVisible(true)]
public static object PtrToStructure (IntPtr ptr, Type structureType);

[System.Security.SecurityCritical]
[System.Runtime.InteropServices.ComVisible(true)]
public static object PtrToStructure (IntPtr ptr, Type structureType);

[<System.Obsolete("PtrToStructure(IntPtr, Type) may be unavailable in future releases. Instead, use PtrToStructure<T>(IntPtr). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296513")>]
[<System.Security.SecurityCritical>]
static member PtrToStructure : nativeint * Type -> obj

static member PtrToStructure : nativeint * Type -> obj

[<System.Security.SecurityCritical>]
static member PtrToStructure : nativeint * Type -> obj

[<System.Runtime.InteropServices.ComVisible(true)>]
static member PtrToStructure : nativeint * Type -> obj

[<System.Security.SecurityCritical>]
[<System.Runtime.InteropServices.ComVisible(true)>]
static member PtrToStructure : nativeint * Type -> obj

Public Shared Function PtrToStructure (ptr As IntPtr, structureType As Type) As Object

Parámetros

Devoluciones

Objeto administrado que contiene los datos a los que apunta el parámetro ptr.

Atributos

ObsoleteAttribute SecurityCriticalAttribute ComVisibleAttribute

Excepciones

Ejemplos

En el ejemplo siguiente se crea una estructura administrada, se transfiere a la memoria no administrada y, a continuación, se transfiere a la memoria administrada mediante el PtrToStructure método .

using System;
using System.Runtime.InteropServices;

public struct Point
{
    public int x;
    public int y;
}

class Example
{

    static void Main()
    {

        // Create a point struct.
        Point p;
        p.x = 1;
        p.y = 1;

        Console.WriteLine("The value of first point is " + p.x + " and " + p.y + ".");

        // Initialize unmanged memory to hold the struct.
        IntPtr pnt = Marshal.AllocHGlobal(Marshal.SizeOf(p));

        try
        {

            // Copy the struct to unmanaged memory.
            Marshal.StructureToPtr(p, pnt, false);

            // Create another point.
            Point anotherP;

            // Set this Point to the value of the
            // Point in unmanaged memory.
            anotherP = (Point)Marshal.PtrToStructure(pnt, typeof(Point));

            Console.WriteLine("The value of new point is " + anotherP.x + " and " + anotherP.y + ".");
        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
    }
}

Imports System.Runtime.InteropServices



Public Structure Point
    Public x As Integer
    Public y As Integer
End Structure


Module Example


    Sub Main()

        ' Create a point struct.
        Dim p As Point
        p.x = 1
        p.y = 1

        Console.WriteLine("The value of first point is " + p.x.ToString + " and " + p.y.ToString + ".")

        ' Initialize unmanged memory to hold the struct.
        Dim pnt As IntPtr = Marshal.AllocHGlobal(Marshal.SizeOf(p))

        Try

            ' Copy the struct to unmanaged memory.
            Marshal.StructureToPtr(p, pnt, False)

            ' Create another point.
            Dim anotherP As Point

            ' Set this Point to the value of the 
            ' Point in unmanaged memory. 
            anotherP = CType(Marshal.PtrToStructure(pnt, GetType(Point)), Point)

            Console.WriteLine("The value of new point is " + anotherP.x.ToString + " and " + anotherP.y.ToString + ".")

        Finally
            ' Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt)
        End Try

    End Sub
End Module

En el ejemplo siguiente se muestra cómo serializar un bloque de memoria no administrado en una estructura administrada mediante el PtrToStructure método .

[StructLayout(LayoutKind::Sequential)]
ref class INNER
{
public:
    [MarshalAs(UnmanagedType::ByValTStr,SizeConst=10)]
    String^ field;

    INNER()
    {
        field = "Test";
    }
};

[StructLayout(LayoutKind::Sequential)]
value struct OUTER
{
public:
    [MarshalAs(UnmanagedType::ByValTStr,SizeConst=10)]
    String^ field;

    [MarshalAs(UnmanagedType::ByValArray,SizeConst=100)]
    array<Byte>^ inner;
};

[DllImport("SomeTestDLL.dll")]
static void CallTest(OUTER^ outerStructurePointer);

void static Work()
{
    OUTER outerStructure;
    array<INNER^>^ innerArray = gcnew array<INNER^>(10);
    INNER^ innerStructure = gcnew INNER;
    int structSize = Marshal::SizeOf(innerStructure);
    int size = innerArray->Length * structSize;
    outerStructure.inner = gcnew array<Byte>(size);

    try
    {
        CallTest(outerStructure);
    }
    catch (SystemException^ ex) 
    {
        Console::WriteLine(ex->Message);
    }

    IntPtr buffer = Marshal::AllocCoTaskMem(structSize * 10);
    Marshal::Copy(outerStructure.inner, 0, buffer, structSize * 10);
    int currentOffset = 0;
    for (int i = 0; i < 10; i++)
    {
        innerArray[i] = safe_cast<INNER^>(Marshal::PtrToStructure(
            IntPtr(buffer.ToInt32() + currentOffset),
            INNER::typeid));
        currentOffset += structSize;
    }
    Console::WriteLine(outerStructure.field);
    Marshal::FreeCoTaskMem(buffer);
}

        [StructLayout(LayoutKind.Sequential)]

        public class  INNER

        {

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst =  10)]

            public string field1 = "Test";
        }	

        [StructLayout(LayoutKind.Sequential)]

        public struct OUTER

        {

            [MarshalAs(UnmanagedType.ByValTStr, SizeConst =  10)]

            public string field1;

            [MarshalAs(UnmanagedType.ByValArray, SizeConst =  100)]

            public byte[] inner;
        }
        [DllImport(@"SomeTestDLL.dll")]

        public static extern void CallTest( ref OUTER po);
        static void Main(string[] args)

        {

            OUTER ed = new OUTER();

            INNER[] inn=new INNER[10];

            INNER test = new INNER();

            int iStructSize = Marshal.SizeOf(test);
            int sz =inn.Length * iStructSize;

            ed.inner = new byte[sz];
            try

            {

                CallTest( ref ed);
            }

            catch(Exception e)

            {

                Console.WriteLine(e.Message);
            }

            IntPtr buffer = Marshal.AllocCoTaskMem(iStructSize*10);

            Marshal.Copy(ed.inner,0,buffer,iStructSize*10);
            int iCurOffset = 0;

            for(int i=0;i<10;i++)

            {
                inn[i] = (INNER)Marshal.PtrToStructure(new
IntPtr(buffer.ToInt32()+iCurOffset),typeof(INNER) );

                iCurOffset += iStructSize;
            }

            Console.WriteLine(ed.field1);

            Marshal.FreeCoTaskMem(buffer);
        }

Comentarios

PtrToStructure a menudo es necesario en la interoperabilidad COM e invocación de plataforma cuando los parámetros de estructura se representan como un System.IntPtr valor. Puede pasar un tipo de valor a este método de sobrecarga. En este caso, el objeto devuelto es una instancia boxed. Si el ptr parámetro es IntPtr.Zeroigual a , null se devolverá.

Consulte también

• GetTypeAttr(IntPtr)

Source:

Marshal.cs

Source:

Marshal.cs

Source:

Marshal.cs

public:
generic <typename T>
 static T PtrToStructure(IntPtr ptr);

[System.Security.SecurityCritical]
public static T PtrToStructure<T> (IntPtr ptr);

public static T? PtrToStructure<T> (IntPtr ptr);

public static T PtrToStructure<T> (IntPtr ptr);

[<System.Security.SecurityCritical>]
static member PtrToStructure : nativeint -> 'T

static member PtrToStructure : nativeint -> 'T

Public Shared Function PtrToStructure(Of T) (ptr As IntPtr) As T

Parámetros de tipo

Parámetros

Devoluciones

Objeto administrado que contiene los datos a los que apunta el parámetro ptr.

Atributos

SecurityCriticalAttribute

Excepciones

Comentarios

PtrToStructure<T>(IntPtr) a menudo es necesario en la interoperabilidad COM e invocación de plataforma cuando los parámetros de estructura se representan como System.IntPtr valores. Puede pasar un tipo de valor a esta sobrecarga de método. Si el ptr parámetro es igual IntPtr.Zero a y T es un tipo de referencia, null se devuelve. Si ptr es IntPtr.Zero igual a y T es un tipo de valor, se produce una NullReferenceException excepción .

Source:

Marshal.cs

Source:

Marshal.cs

Source:

Marshal.cs

public:
generic <typename T>
 static void PtrToStructure(IntPtr ptr, T structure);

[System.Security.SecurityCritical]
public static void PtrToStructure<T> (IntPtr ptr, T structure);

public static void PtrToStructure<T> (IntPtr ptr, T structure);

[<System.Security.SecurityCritical>]
static member PtrToStructure : nativeint * 'T -> unit

static member PtrToStructure : nativeint * 'T -> unit

Public Shared Sub PtrToStructure(Of T) (ptr As IntPtr, structure As T)

Parámetros de tipo

Parámetros

Atributos

SecurityCriticalAttribute

Excepciones

Comentarios

PtrToStructure<T>(IntPtr, T) a menudo es necesario en la interoperabilidad COM e invocación de plataforma cuando los parámetros de estructura se representan como IntPtr valores. No se puede usar esta sobrecarga de método con tipos de valor. Si el ptr parámetro es igual IntPtr.Zero a y T es un tipo de referencia, null se devuelve. Si ptr es IntPtr.Zero igual a y T es un tipo de valor, se produce una NullReferenceException excepción .