UrlIsA function (shlwapi.h)

Article
02/09/2023

Tests whether a URL is a specified type.

Syntax

BOOL UrlIsA(
  [in] PCSTR pszUrl,
       URLIS UrlIs
);

Parameters

[in] pszUrl

Type: PCTSTR

A null-terminated string of maximum length INTERNET_MAX_URL_LENGTH that contains the URL.

UrlIs

Type: URLIS

The type of URL to be tested for. This parameter can take one of the following values.

URLIS_APPLIABLE

Attempt to determine a valid scheme for the URL.

URLIS_DIRECTORY

Does the URL string end with a directory?

URLIS_FILEURL

Is the URL a file URL?

URLIS_HASQUERY

Does the URL have an appended query string?

URLIS_NOHISTORY

Is the URL a URL that is not typically tracked in navigation history?

URLIS_OPAQUE

Is the URL opaque?

URLIS_URL

Is the URL valid?

Return value

Type: BOOL

For all but one of the URL types, UrlIs returns TRUE if the URL is the specified type, or FALSE if not.

If UrlIs is set to URLIS_APPLIABLE, UrlIs will attempt to determine the URL scheme. If the function is able to determine a scheme, it returns TRUE, or FALSE otherwise.

Remarks

Note

The shlwapi.h header defines UrlIs as an alias which 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 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 2000 Professional, Windows XP [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	shlwapi.h
Library	Shlwapi.lib
DLL	Shlwapi.dll (version 5.0 or later)