Marshal.WriteIntPtr Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Writes a processor native-sized integer value to unmanaged memory. 32-bit integers are written on 32-bit systems, and 64-bit integers are written on 64-bit systems. Writing to unaligned memory locations is supported.
Overloads
WriteIntPtr(IntPtr, IntPtr) |
Writes a processor native sized integer value into unmanaged memory. |
WriteIntPtr(IntPtr, Int32, IntPtr) |
Writes a processor native-sized integer value to unmanaged memory at a specified offset. |
WriteIntPtr(Object, Int32, IntPtr) |
Obsolete.
Writes a processor native sized integer value to unmanaged memory. |
WriteIntPtr(IntPtr, IntPtr)
- Source:
- Marshal.cs
- Source:
- Marshal.cs
- Source:
- Marshal.cs
Writes a processor native sized integer value into unmanaged memory.
public:
static void WriteIntPtr(IntPtr ptr, IntPtr val);
[System.Security.SecurityCritical]
public static void WriteIntPtr (IntPtr ptr, IntPtr val);
public static void WriteIntPtr (IntPtr ptr, IntPtr val);
[<System.Security.SecurityCritical>]
static member WriteIntPtr : nativeint * nativeint -> unit
static member WriteIntPtr : nativeint * nativeint -> unit
Public Shared Sub WriteIntPtr (ptr As IntPtr, val As IntPtr)
Parameters
- ptr
-
IntPtr
nativeint
The address in unmanaged memory to write to.
- val
-
IntPtr
nativeint
The value to write.
- Attributes
Exceptions
Examples
The following example demonstrates how to read and write to an unmanaged array using the ReadIntPtr and WriteIntPtr methods.
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
Remarks
WriteIntPtr enables direct interaction with an unmanaged C-style IntPtr
array, eliminating the expense of copying an entire unmanaged array (using Marshal.Copy) to a separate managed array before setting its element values.
Writing to unaligned memory locations is supported.
See also
Applies to
WriteIntPtr(IntPtr, Int32, IntPtr)
- Source:
- Marshal.cs
- Source:
- Marshal.cs
- Source:
- Marshal.cs
Writes a processor native-sized integer value to unmanaged memory at a specified offset.
public:
static void WriteIntPtr(IntPtr ptr, int ofs, IntPtr val);
[System.Security.SecurityCritical]
public static void WriteIntPtr (IntPtr ptr, int ofs, IntPtr val);
public static void WriteIntPtr (IntPtr ptr, int ofs, IntPtr val);
[<System.Security.SecurityCritical>]
static member WriteIntPtr : nativeint * int * nativeint -> unit
static member WriteIntPtr : nativeint * int * nativeint -> unit
Public Shared Sub WriteIntPtr (ptr As IntPtr, ofs As Integer, val As IntPtr)
Parameters
- ptr
-
IntPtr
nativeint
The base address in unmanaged memory to write to.
- ofs
- Int32
An additional byte offset, which is added to the ptr
parameter before writing.
- val
-
IntPtr
nativeint
The value to write.
- Attributes
Exceptions
Base address (ptr
) plus offset byte (ofs
) produces a null or invalid address.
Examples
The following example demonstrates how to read and write to an unmanaged array using the ReadIntPtr and WriteIntPtr methods.
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
Remarks
This method writes a 32 bit integer on 32 bit systems, and a 64 bit integer on 64 bit systems.
WriteIntPtr enables direct interaction with an unmanaged C-style IntPtr
array, eliminating the expense of copying an entire unmanaged array (using Marshal.Copy) to a separate managed array before setting its element values.
Writing to unaligned memory locations is supported.
See also
Applies to
WriteIntPtr(Object, Int32, IntPtr)
- Source:
- Marshal.cs
- Source:
- Marshal.cs
- Source:
- Marshal.cs
Caution
WriteIntPtr(Object, Int32, IntPtr) may be unavailable in future releases.
Writes a processor native sized integer value to unmanaged memory.
public:
static void WriteIntPtr(System::Object ^ ptr, int ofs, IntPtr val);
[System.Obsolete("WriteIntPtr(Object, Int32, IntPtr) may be unavailable in future releases.")]
[System.Security.SecurityCritical]
public static void WriteIntPtr (object ptr, int ofs, IntPtr val);
[System.Obsolete("WriteIntPtr(Object, Int32, IntPtr) may be unavailable in future releases.")]
public static void WriteIntPtr (object ptr, int ofs, IntPtr val);
public static void WriteIntPtr (object ptr, int ofs, IntPtr val);
[System.Security.SecurityCritical]
public static void WriteIntPtr (object ptr, int ofs, IntPtr val);
[<System.Obsolete("WriteIntPtr(Object, Int32, IntPtr) may be unavailable in future releases.")>]
[<System.Security.SecurityCritical>]
static member WriteIntPtr : obj * int * nativeint -> unit
[<System.Obsolete("WriteIntPtr(Object, Int32, IntPtr) may be unavailable in future releases.")>]
static member WriteIntPtr : obj * int * nativeint -> unit
static member WriteIntPtr : obj * int * nativeint -> unit
[<System.Security.SecurityCritical>]
static member WriteIntPtr : obj * int * nativeint -> unit
Public Shared Sub WriteIntPtr (ptr As Object, ofs As Integer, val As IntPtr)
Parameters
- ptr
- Object
The base address in unmanaged memory of the target object.
- ofs
- Int32
An additional byte offset, which is added to the ptr
parameter before writing.
- val
-
IntPtr
nativeint
The value to write.
- Attributes
Exceptions
Base address (ptr
) plus offset byte (ofs
) produces a null or invalid address.
ptr
is an ArrayWithOffset object. This method does not accept ArrayWithOffset parameters.
Remarks
WriteIntPtr enables direct interaction with an unmanaged C-style byte array, eliminating the expense of copying an entire unmanaged array (using Marshal.Copy) to a separate managed array before setting its element values.
Writing to unaligned memory locations is supported.