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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 



The total size of the file, in bytes.
The total number of bytes transferred from the source file to the destination file since the copy operation began.
The total size of the current file stream, in bytes.
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.
Identifies the current stream. The stream number is 1 the first time CopyProgressRoutine is called.
Specifies the reason that CopyProgressRoutine was called. This parameter can be one of the following values:




Another part of the data file was copied.


Another stream was created and is about to be copied. This is the callback reason given when the callback routine is first invoked.

Identifies the source file.
Identifies the destination file
The argument passed to CopyProgressRoutine by the CopyFileEx function.

Return values

The CopyProgressRoutine function should return one of the following values:




Continue the copy operation.


Cancel the copy operation and delete the destination file.


Stop the copy operation. It can be restarted at a later time.


Continue the copy operation, but stop invoking CopyProgressRoutine to report progress.


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


See also:

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