CopyProgressRoutine callback function

An application-defined callback function used with the CopyFileEx, MoveFileTransacted, and MoveFileWithProgress functions. It is called when a portion of a copy or move operation is completed. The LPPROGRESS_ROUTINE type defines a pointer to this callback function. CopyProgressRoutine is a placeholder for the application-defined function name.

Syntax

C++


DWORD CALLBACK CopyProgressRoutine(
  _In_      LARGE_INTEGER TotalFileSize,
  _In_      LARGE_INTEGER TotalBytesTransferred,
  _In_      LARGE_INTEGER StreamSize,
  _In_      LARGE_INTEGER StreamBytesTransferred,
  _In_      DWORD dwStreamNumber,
  _In_      DWORD dwCallbackReason,
  _In_      HANDLE hSourceFile,
  _In_      HANDLE hDestinationFile,
  _In_opt_  LPVOID lpData
);

typedef DWORD (WINAPI *LPPROGRESS_ROUTINE)(
    _In_      LARGE_INTEGER TotalFileSize,
    _In_      LARGE_INTEGER TotalBytesTransferred,
    _In_      LARGE_INTEGER StreamSize,
    _In_      LARGE_INTEGER StreamBytesTransferred,
    _In_      DWORD dwStreamNumber,
    _In_      DWORD dwCallbackReason,
    _In_      HANDLE hSourceFile,
    _In_      HANDLE hDestinationFile,
    _In_opt_  LPVOID lpData
);

Parameters

TotalFileSize [in]

The total size of the file, in bytes.

TotalBytesTransferred [in]

The total number of bytes transferred from the source file to the destination file since the copy operation began.

StreamSize [in]

The total size of the current file stream, in bytes.

StreamBytesTransferred [in]

The total number of bytes in the current stream that have been transferred from the source file to the destination file since the copy operation began.

dwStreamNumber [in]

A handle to the current stream. The first time CopyProgressRoutine is called, the stream number is 1.

dwCallbackReason [in]

The reason that CopyProgressRoutine was called. This parameter can be one of the following values.

Value	Meaning
CALLBACK_CHUNK_FINISHED 0x00000000	Another part of the data file was copied.
CALLBACK_STREAM_SWITCH 0x00000001	Another stream was created and is about to be copied. This is the callback reason given when the callback routine is first invoked.

hSourceFile [in]

A handle to the source file.

hDestinationFile [in]

A handle to the destination file

lpData [in, optional]

Argument passed to CopyProgressRoutine by CopyFileEx, MoveFileTransacted, or MoveFileWithProgress.

Return value

The CopyProgressRoutine function should return one of the following values.

Return code/value	Description
PROGRESS_CANCEL 1	Cancel the copy operation and delete the destination file.
PROGRESS_CONTINUE 0	Continue the copy operation.
PROGRESS_QUIET 3	Continue the copy operation, but stop invoking CopyProgressRoutine to report progress.
PROGRESS_STOP 2	Stop the copy operation. It can be restarted at a later time.

Remarks

An application can use this information to display a progress bar that shows the total number of bytes copied as a percent of the total file size.

Requirements

Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Header	WinBase.h (include Windows.h)

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