SetupDiGetClassDescriptionExW function (setupapi.h)
The SetupDiGetClassDescriptionEx function retrieves the description of a setup class installed on a local or remote computer.
Syntax
WINSETUPAPI BOOL SetupDiGetClassDescriptionExW(
[in] const GUID *ClassGuid,
[out] PWSTR ClassDescription,
[in] DWORD ClassDescriptionSize,
[out, optional] PDWORD RequiredSize,
[in, optional] PCWSTR MachineName,
PVOID Reserved
);
Parameters
[in] ClassGuid
A pointer to the GUID for the setup class whose description is to be retrieved.
[out] ClassDescription
A pointer to a character buffer that receives the class description.
[in] ClassDescriptionSize
The size, in characters, of the buffer that is pointed to by the ClassDescription parameter. The maximum length, in characters, of a NULL-terminated class description is LINE_LEN. For more information, see the following Remarks section.
[out, optional] RequiredSize
A pointer to a DWORD-typed variable that receives the size, in characters, that is required to store the requested NULL-terminated class description. This pointer is optional and can be NULL.
[in, optional] MachineName
A pointer to a NULL-terminated string that supplies the name of a remote computer on which the setup class resides. This pointer is optional and can be NULL. If the class is installed on a local computer, set the pointer to NULL.
Reserved
Reserved for system use. A caller of this function must set this parameter to NULL.
Return value
The function returns TRUE if it is successful. Otherwise, it returns FALSE and the logged error can be retrieved with a call to GetLastError.
Remarks
If there is a friendly name in the registry key for the class, this routine returns the friendly name. Otherwise, this routine returns the class name.
SetupDiGetClassDescriptionEx does not enforce a restriction on the length of the class description that it can return. This function returns the required size for a NULL-terminated class description even if it is greater than LINE_LEN. However, LINE_LEN is the maximum length of a valid NULL-terminated class description. A caller should never need a buffer that is larger than LINE_LEN.
Note
The setupapi.h header defines SetupDiGetClassDescriptionEx 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 | Available in Microsoft Windows 2000 and later versions of Windows. |
| Target Platform | Desktop |
| Header | setupapi.h (include Setupapi.h) |
| Library | Setupapi.lib |