ReadInt32 Method (Object, Int32)

Marshal.ReadInt32 Method (Object, Int32)


Reads a 32-bit signed integer at a given offset from unmanaged memory.

Namespace:   System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

static member ReadInt32 : 
        ptr:Object *
        ofs:int -> int


Type: System.Object

The base address in unmanaged memory of the source object.

Type: System.Int32

An additional byte offset, which is added to the ptr parameter before reading.

Return Value

Type: System.Int32

The 32-bit signed integer read from unmanaged memory at the given offset.

Exception Condition

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.

ReadInt32 enables direct interaction with an unmanaged 32-bit signed array, eliminating the expense of copying an entire unmanaged array (using Marshal.Copy) to a separate managed array before reading its element values.

Reading from unaligned memory locations is supported.


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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