# IntPtr.Subtraction(IntPtr, Int32)IntPtr.Subtraction(IntPtr, Int32)IntPtr.Subtraction(IntPtr, Int32)IntPtr.Subtraction(IntPtr, Int32) Operator

## Definition

Subtrahiert einen Offset vom Wert eines Zeigers.Subtracts an offset from the value of a pointer.

``````public:
static IntPtr operator -(IntPtr pointer, int offset);``````
``public static IntPtr operator - (IntPtr pointer, int offset);``
``static member ( - ) : nativeint * int -> nativeint``
``Public Shared Operator - (pointer As IntPtr, offset As Integer) As IntPtr``

#### Parameter

pointer
IntPtr IntPtr IntPtr IntPtr

Der Zeiger, von dem der Offset subtrahiert werden soll.The pointer to subtract the offset from.

offset
Int32 Int32 Int32 Int32

Der Offset, der subtrahiert werden soll.The offset to subtract.

#### Gibt zurück

Ein neuer Zeiger, der die Subtraktion von `offset` von `pointer` widerspiegelt.A new pointer that reflects the subtraction of `offset` from `pointer`.

## Hinweise

Die Subtraction -Methode definiert den Subtraktions Vorgang IntPtr für-Objekte.The Subtraction method defines the subtraction operation for IntPtr objects. Sie ermöglicht Code wie den folgenden.It enables code such as the following.

``````int[] arr = { 2, 4, 6, 8, 10, 12, 14, 16, 18, 20};
unsafe {
fixed(int* parr = &arr[arr.GetUpperBound(0)])
{
IntPtr ptr = new IntPtr(parr);
for (int ctr = 0; ctr <= arr.GetUpperBound(0); ctr++)
{
IntPtr newPtr = ptr - ctr * sizeof(Int32);
}
}
}
// The example displays the following output:
//       20   18   16   14   12   10   8   6   4   2
``````
``````Dim arr() As Integer = {2, 4, 6, 8, 10, 12, 14, 16, 18, 20 }
Dim ptr As IntPtr = Marshal.UnsafeAddrOfPinnedArrayElement(arr, arr.GetUpperBound(0))
For ctr As Integer= 0 To arr.GetUpperBound(0)
Dim newPtr As IntPtr = ptr - ctr * Len(arr(0))