CopyFileFromAppW function (fileapifromapp.h)

Copies an existing file to a new file. The behavior of this function is identical to CopyFile, except that this function adheres to the Universal Windows Platform app security model.

Syntax

WINSTORAGEAPI BOOL CopyFileFromAppW(
  LPCWSTR lpExistingFileName,
  LPCWSTR lpNewFileName,
  BOOL    bFailIfExists
) noexcept;

Parameters

lpExistingFileName

The name of an existing file.

For information about opting out of 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 function fails, and GetLastError returns ERROR_FILE_NOT_FOUND.

lpNewFileName

The name of the new file.

In the ANSI version of this function, the name is limited to MAX_PATH characters. To extend this limit to 32,767 wide characters, call the Unicode version of the function and prepend "\\?\" to the path. For more information, see Naming a File.

For the unicode version of this function (CopyFileFromAppW), 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.

bFailIfExists

If this parameter is TRUE and the new file specified by lpNewFileName already exists, the function fails. If this parameter is FALSE and the new file already exists, the function overwrites the existing file and succeeds.

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.

Requirements