Simplifies a path by removing navigation elements such as "." and ".." to produce a direct, well-formed path.
This function differs from PathCchCanonicalize in that it allows for a longer final path to be constructed.
This function differs from PathAllocCanonicalize in that the caller must declare the size of the returned string, which is stored on the stack.
This function differs from PathCanonicalize in that it accepts paths with "\", "\?" and "\?\UNC" prefixes.
WINPATHCCHAPI HRESULT PathCchCanonicalizeEx( PWSTR pszPathOut, size_t cchPathOut, PCWSTR pszPathIn, ULONG dwFlags );
A pointer to a buffer that, when this function returns successfully, receives the edited path string.
The size of the buffer pointed to by pszPathOut, in characters.
A pointer to the original path string. If this value is NULL, points to an empty string, or results in an empty string once the "." and ".." elements are removed, a single backslash is copied to the buffer pointed to by pszPathOut.
One or more of the following flags:
If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT code, including but not limited to the following.
||The cchPathOut value is greater than PATHCCH_MAX_CCH.|
||A path segment has more than PATHCCH_MAX_CCH characters, or, if the PATHCCH_ALLOW_LONG_PATHS flag is not set, exceeds the standard path segment length limit of 256 characters.|
||The function could not allocate a buffer of the neccessary size.|
This function responds to the strings "." and ".." embedded in a path. The ".." string indicates to remove the immediately preceding path segment. The "." string indicates to skip over the next path segment. Note that the root segment of the path cannot be removed. If there are more ".." strings than there are path segments, the function returns S_OK and the buffer pointed to by pszPathOut contains a single backslash, "".
All trailing periods are removed from the path, except when preceded by the "" wild card character. In that case, a single period is retained after the '' character, but all other trailing periods are removed.
If the resulting path is a root drive ("x:"), a backslash is appended ("x:").
The following examples show the effect of these strings.
|Original string||Canonicalized string|
|Minimum supported client||Windows 8 [desktop apps | UWP apps]|
|Minimum supported server||Windows Server 2012 [desktop apps | UWP apps]|