C# Signature:

[DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Auto)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CopyFileEx(string lpExistingFileName, string lpNewFileName,
   CopyProgressRoutine lpProgressRoutine, IntPtr lpData, ref Int32 pbCancel,
   CopyFileFlags dwCopyFlags);

VB Signature:

Private Declare Auto Function CopyFileEx Lib "kernel32.dll" (ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal lpProgressRoutine As CopyProgressRoutine, ByVal lpData As IntPtr, ByRef pbCancel As Boolean, ByVal dwCopyFlags As CopyFileFlags) As <MarshalAs(UnmanagedType.Bool)> Boolean

User-Defined Types:

CopyProgressRoutine, CopyFileFlags

Notes:

None

Tips & Tricks:

Please add some!

Sample Code:

    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool CopyFileEx(string lpExistingFileName, string lpNewFileName,
       CopyProgressRoutine lpProgressRoutine, IntPtr lpData, ref Int32 pbCancel,
       CopyFileFlags dwCopyFlags);

    delegate CopyProgressResult CopyProgressRoutine(
    long TotalFileSize,
    long TotalBytesTransferred,
    long StreamSize,
    long StreamBytesTransferred,
    uint dwStreamNumber,
    CopyProgressCallbackReason dwCallbackReason,
    IntPtr hSourceFile,
    IntPtr hDestinationFile,
    IntPtr lpData);

    int pbCancel;

    enum CopyProgressResult : uint
    {
        PROGRESS_CONTINUE = 0,
        PROGRESS_CANCEL = 1,
        PROGRESS_STOP = 2,
        PROGRESS_QUIET = 3
    }

    enum CopyProgressCallbackReason : uint
    {
        CALLBACK_CHUNK_FINISHED = 0x00000000,
        CALLBACK_STREAM_SWITCH = 0x00000001
    }

    [Flags]
    enum CopyFileFlags : uint
    {
        COPY_FILE_FAIL_IF_EXISTS = 0x00000001,
        COPY_FILE_RESTARTABLE = 0x00000002,
        COPY_FILE_OPEN_SOURCE_FOR_WRITE = 0x00000004,
        COPY_FILE_ALLOW_DECRYPTED_DESTINATION = 0x00000008
    }

    private void XCopy(string oldFile, string newFile)
    {
        CopyFileEx(oldFile, newFile, new CopyProgressRoutine(this.CopyProgressHandler), IntPtr.Zero, ref pbCancel, CopyFileFlags.COPY_FILE_RESTARTABLE);
    }

    private CopyProgressResult CopyProgressHandler(long total, long transferred, long streamSize, long StreamByteTrans, uint dwStreamNumber,CopyProgressCallbackReason reason, IntPtr hSourceFile, IntPtr hDestinationFile, IntPtr lpData)
    {
        return CopyProgressResult.PROGRESS_CONTINUE;
    }

Alternative Managed API:

File.Copy performs copying without a callback or options.