GetClassInfo function
Retrieves information about a window class.
Syntax
BOOL WINAPI GetClassInfo( _In_opt_ HINSTANCE hInstance, _In_ LPCTSTR lpClassName, _Out_ LPWNDCLASS lpWndClass );
Parameters
- hInstance [in, optional]
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Type: HINSTANCE
A handle to the instance of the application that created the class. To retrieve information about classes defined by the system (such as buttons or list boxes), set this parameter to NULL.
- lpClassName [in]
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Type: LPCTSTR
The class name. The name must be that of a preregistered class or a class registered by a previous call to the RegisterClass or RegisterClassEx function.
Alternatively, this parameter can be an atom. If so, it must be a class atom created by a previous call to RegisterClass or RegisterClassEx. The atom must be in the low-order word of lpClassName; the high-order word must be zero.
- lpWndClass [out]
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Type: LPWNDCLASS
A pointer to a WNDCLASS structure that receives the information about the class.
Return value
Type: Type: BOOL
If the function finds a matching class and successfully copies the data, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Requirements
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Minimum supported client |
Windows 2000 Professional [desktop apps only] |
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Minimum supported server |
Windows 2000 Server [desktop apps only] |
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Header |
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Library |
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DLL |
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Unicode and ANSI names |
GetClassInfoW (Unicode) and GetClassInfoA (ANSI) |
See also
- Reference
- GetClassInfoEx
- GetClassLong
- GetClassName
- RegisterClass
- RegisterClassEx
- WNDCLASS
- Conceptual
- Window Classes