CopyFileTransactedW function (winbase.h)
[Microsoft strongly recommends developers utilize alternative means to achieve your application’s needs. Many scenarios that TxF was developed for can be achieved through simpler and more readily available techniques. Furthermore, TxF may not be available in future versions of Microsoft Windows. For more information, and alternatives to TxF, please see Alternatives to using Transactional NTFS.]
Copies an existing file to a new file as a transacted operation, notifying the application of its progress through a callback function.
Syntax
BOOL CopyFileTransactedW(
[in] LPCWSTR lpExistingFileName,
[in] LPCWSTR lpNewFileName,
[in, optional] LPPROGRESS_ROUTINE lpProgressRoutine,
[in, optional] LPVOID lpData,
[in, optional] LPBOOL pbCancel,
[in] DWORD dwCopyFlags,
[in] HANDLE hTransaction
);
Parameters
[in] lpExistingFileName
The name of an existing file.
By default, the name is limited to MAX_PATH characters. To extend this limit to 32,767 wide characters, prepend "\\?\" to the path. For more information, see Naming Files, Paths, and Namespaces.
Tip
Starting with Windows 10, Version 1607, you can opt-in to remove the MAX_PATH limitation without prepending "\\?\". See the "Maximum Path Length Limitation" section of Naming Files, Paths, and Namespaces for details.
If lpExistingFileName does not exist, the CopyFileTransacted function fails, and the GetLastError function returns ERROR_FILE_NOT_FOUND.
The file must reside on the local computer; otherwise, the function fails and the last error code is set to ERROR_TRANSACTIONS_UNSUPPORTED_REMOTE.
[in] lpNewFileName
The name of the new file.
By default, the name is limited to MAX_PATH characters. To extend this limit to 32,767 wide characters, prepend "\\?\" to the path. For more information, see Naming Files, Paths, and Namespaces.
Tip
Starting with Windows 10, Version 1607, you can opt-in to remove the MAX_PATH limitation without prepending "\\?\". See the "Maximum Path Length Limitation" section of Naming Files, Paths, and Namespaces for details.
[in, optional] lpProgressRoutine
The address of a callback function of type LPPROGRESS_ROUTINE that is called each time another portion of the file has been copied. This parameter can be NULL. For more information on the progress callback function, see the CopyProgressRoutine function.
[in, optional] lpData
The argument to be passed to the callback function. This parameter can be NULL.
[in, optional] pbCancel
If this flag is set to TRUE during the copy operation, the operation is canceled. Otherwise, the copy operation will continue to completion.
[in] dwCopyFlags
Flags that specify how the file is to be copied. This parameter can be a combination of the following values.
[in] hTransaction
A handle to the transaction. This handle is returned by the CreateTransaction function.
Return value
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information call GetLastError.
If lpProgressRoutine returns PROGRESS_CANCEL due to the user canceling the operation, CopyFileTransacted will return zero and GetLastError will return ERROR_REQUEST_ABORTED. In this case, the partially copied destination file is deleted.
If lpProgressRoutine returns PROGRESS_STOP due to the user stopping the operation, CopyFileTransacted will return zero and GetLastError will return ERROR_REQUEST_ABORTED. In this case, the partially copied destination file is left intact.
If you attempt to call this function with a handle to a transaction that has already been rolled back, CopyFileTransacted will return either ERROR_TRANSACTION_NOT_ACTIVE or ERROR_INVALID_TRANSACTION.
Remarks
This function preserves extended attributes, OLE structured storage, NTFS file system alternate data streams, security attributes, and file attributes.
Windows 7, Windows Server 2008 R2, Windows Server 2008 and Windows Vista: Security resource attributes (ATTRIBUTE_SECURITY_INFORMATION) for the existing file are not copied to the new file until Windows 8 and Windows Server 2012.
This function fails with ERROR_ACCESS_DENIED if the destination file already exists and has the FILE_ATTRIBUTE_HIDDEN or FILE_ATTRIBUTE_READONLY attribute set.
Encrypted files are not supported by TxF.
If COPY_FILE_COPY_SYMLINK is specified, the following rules apply:
- If the source file is a symbolic link, the symbolic link is copied, not the target file.
- If the source file is not a symbolic link, there is no change in behavior.
- If the destination file is an existing symbolic link, the symbolic link is overwritten, not the target file.
- If COPY_FILE_FAIL_IF_EXISTS is also specified, and the destination file is an existing symbolic link, the operation fails in all cases.
- If COPY_FILE_FAIL_IF_EXISTS is also specified, and the destination file is an existing symbolic link, the operation fails only if the target of the symbolic link exists.
- If COPY_FILE_FAIL_IF_EXISTS is not specified, there is no change in behavior.
Link tracking is not supported by TxF.
In Windows 8 and Windows Server 2012, this function is supported by the following technologies.
| Technology | Supported |
|---|---|
| Server Message Block (SMB) 3.0 protocol | No |
| SMB 3.0 Transparent Failover (TFO) | No |
| SMB 3.0 with Scale-out File Shares (SO) | No |
| Cluster Shared Volume File System (CsvFS) | No |
| Resilient File System (ReFS) | No |
Note that SMB 3.0 does not support TxF.
Note
The winbase.h header defines CopyFileTransacted as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista [desktop apps only] |
| Minimum supported server | Windows Server 2008 [desktop apps only] |
| Target Platform | Windows |
| Header | winbase.h (include Windows.h) |
| Library | Kernel32.lib |
| DLL | Kernel32.dll |