GetThreadDesktop function (winuser.h)
Retrieves a handle to the desktop assigned to the specified thread.
Syntax
HDESK GetThreadDesktop(
[in] DWORD dwThreadId
);
Parameters
[in] dwThreadId
The thread identifier. The GetCurrentThreadId and CreateProcess functions return thread identifiers.
Return value
If the function succeeds, the return value is a handle to the desktop associated with the specified thread. You do not need to call the CloseDesktop function to close the returned handle.
If the function fails, the return value is NULL. To get extended error information, call GetLastError.
Remarks
The system associates a desktop with a thread when that thread is created. A thread can use the SetThreadDesktop function to change its desktop. The desktop associated with a thread must be on the window station associated with the thread's process.
The calling process can use the returned handle in calls to the GetUserObjectInformation, GetUserObjectSecurity, SetUserObjectInformation, and SetUserObjectSecurity functions.
A service application is created with an associated window station and desktop, so there is no need to call a USER or GDI function to connect the service to a window station and desktop.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | winuser.h (include Windows.h) |
| Library | User32.lib |
| DLL | User32.dll |
| API set | ext-ms-win-ntuser-windowstation-l1-1-0 (introduced in Windows 8) |