The GetClassLong function retrieves the specified 32-bit (long) value from the WNDCLASS structure associated with the specified window.
DWORD GetClassLong(
HWND hWnd, |
// handle of window |
int nIndex |
// offset of value to retrieve |
); |
Value |
Action |
GCW_ATOM |
Retrieves an ATOM value that uniquely identifies the window class. This is the same atom that the RegisterClass function returns. |
GCL_CBCLSEXTRA |
Retrieves the size, in bytes, of the extra memory associated with the class. |
GCL_CBWNDEXTRA |
Retrieves the size, in bytes, of the extra window memory associated with each window in the class. For information on how to access this memory, see GetWindowLong and GetWindowWord . |
GCL_HBRBACKGROUND |
Retrieves the handle of the background brush associated with the class. |
GCL_HCURSOR |
Retrieves the handle of the cursor associated with the class. |
GCL_HICON |
Retrieves the handle of the icon associated with the class. |
GCL_HICONSM |
Retrieves the handle of the small icon associated with the class. |
GCL_HMODULE |
Retrieves the handle of the module that registered the class. |
GCL_MENUNAME |
Retrieves the address of the menu name string. The string identifies the menu resource associated with the class. |
GCL_STYLE |
Retrieves the window-class style bits. |
GCL_WNDPROC |
Retrieves the address of the window procedure associated with the class. |
If the function succeeds, the return value is the requested 32-bit value.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Reserve extra class memory by specifying a nonzero value in the cbClsExtra member of the WNDCLASS structure used with the RegisterClass function.
GetClassWord, GetWindowLong, GetWindowWord, RegisterClass, SetClassLong, SetClassWord, WNDCLASS
file: /Techref/os/win/api/win32/func/src/f28_4.htm, 5KB, , updated: 2000/4/7 12:19, local time: 2024/8/23 11:51,
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