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OpCodes.Cpblk Field

Copies a specified number bytes from a source address to a destination address.

Namespace: System.Reflection.Emit
Assembly: mscorlib (in mscorlib.dll)

public static readonly OpCode Cpblk
public static final OpCode Cpblk
public static final var Cpblk : OpCode

The following table lists the instruction's hexadecimal and Microsoft Intermediate Language (MSIL) assembly format, along with a brief reference summary:

Format

Assembly Format

Description

FE 17

cpblk

Copy data from one memory block to another.

The stack transitional behavior, in sequential order, is:

  1. The destination address is pushed onto the stack.

  2. The source address is pushed onto the stack.

  3. The number of bytes to copy is pushed onto the stack.

  4. The number of bytes, the source address, and the destination address are popped from the stack; the specified number of bytes are copied from the source address to the destination address.

The cpblk instruction copies a number (type unsigned int32) of bytes from a source address (of type *, natural int, or &) to a destination address (of type *, natural int, or &). The behavior of cpblk is unspecified if the source and destination areas overlap.

cpblk assumes that both the source and destination addressed are aligned to the natural size of the machine. The cpblk instruction can be immediately preceded by the unaligned.<prefix> instruction to indicate that either the source or the destination is unaligned.

The operation of the cpblk instruction can be altered by an immediately preceding Volatile or Unaligned prefix instruction.

NullReferenceException may be thrown if an invalid address is detected.

The following Emit method overload can use the cpblk opcode:

  • ILGenerator.Emit(OpCode)

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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