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NF:winuser.IsGUIThread |
IsGUIThread function (winuser.h) |
Determines whether the calling thread is already a GUI thread. It can also optionally convert the thread to a GUI thread. |
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winmsg\isguithread.htm |
winmsg |
VS|winui|~\winui\windowsuserinterface\windowing\windows\windowreference\windowfunctions\isguithread.htm |
12/05/2018 |
IsGUIThread, IsGUIThread function [Windows and Messages], _win32_IsGUIThread, _win32_isguithread_cpp, winmsg.isguithread, winui._win32_isguithread, winuser/IsGUIThread |
winuser.h |
Windows.h |
Windows |
Windows XP [desktop apps only] |
Windows Server 2003 [desktop apps only] |
User32.lib |
User32.dll |
Windows |
19H1 |
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Determines whether the calling thread is already a GUI thread. It can also optionally convert the thread to a GUI thread.
Type: BOOL
If TRUE and the thread is not a GUI thread, convert the thread to a GUI thread.
Type: BOOL
The function returns a nonzero value in the following situations:
- If the calling thread is already a GUI thread.
- If bConvert is TRUE and the function successfully converts the thread to a GUI thread.
If bConvert is TRUE and the function cannot successfully convert the thread to a GUI thread, IsGUIThread returns ERROR_NOT_ENOUGH_MEMORY.