CopyProgressRoutine info  Overview  Group

The CopyProgressRoutine function is called when a portion of a copy operation started by CopyFileEx is completed. This function is an application-defined callback routine.

DWORD WINAPI CopyProgressRoutine(

LARGE_INTEGER TotalFileSize,	// total file size, in bytes
LARGE_INTEGER TotalBytesTransferred,	// total number of bytes transferred
LARGE_INTEGER StreamSize,	// total number of bytes for this stream
LARGE_INTEGER StreamBytesTransferred,	// total number of bytes transferred for this stream
DWORD dwStreamNumber,	// the current stream
DWORD dwCallbackReason,	// reason for callback
HANDLE hSourceFile,	// handle to the source file
HANDLE hDestinationFile,	// handle to the destination file
LPVOID lpData	// passed by CopyFileEx
);

Parameters

TotalFileSize

The total size of the file, in bytes.

TotalBytesTransferred

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

StreamSize

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

StreamBytesTransferred

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

Identifies the current stream. The stream number is 1 the first time CopyProgressRoutine is called.

dwCallbackReason

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

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

hSourceFile

Identifies the source file.

hDestinationFile

Identifies the destination file

lpData

The argument passed to CopyProgressRoutine by the CopyFileEx function.

Return values

The CopyProgressRoutine function should return one of the following values:

Value	Meaning
PROGRESS_CONTINUE	Continue the copy operation.
PROGRESS_CANCEL	Cancel the copy operation and delete the destination file.
PROGRESS_STOP	Stop the copy operation. It can be restarted at a later time.
PROGRESS_QUIET	Continue the copy operation, but stop invoking CopyProgressRoutine to report progress.

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.

See Also

CopyFileEx