| WORD GetClassWord(hwnd, nIndex) | |||||
| HWND hwnd; | /* handle of window | */ | |||
| int nIndex; | /* offset of value to retrieve | */ | |||
This function retrieves the value specified by the nIndex parameter from the Windows additional class memory defined during class registration for the window specified by the hwnd parameter.
hwnd
Identifies the window.
nIndex
Specifies the byte offset of the value to be retrieved.
The return value specifies the value retrieved from the Windows additional class memory defined during class registration for the specified window.
To access any extra two-byte values allocated when the window-class structure was created, use a positive byte offset as the index specified by the nIndex parameter, starting at zero for the first two-byte value in the extra space, two for the next two-byte value and so on.
Use the GetClassLong function to retrieve the following system-defined values:
| Old GetClassWord Index | New GetClassLong Index |
| GCW_CBCLSEXTRA | GCL_CBCLSEXTRA |
| GCW_CBWNDEXTRA | GCL_CBWNDEXTRA |
| GCW_HBRBACKGROUND | GCL_HBRBACKGROUND |
| GCW_HCURSOR | GCL_HCURSOR |
| GCW_HICON | GCL_HICON |
| GCW_HMODULE | GCL_HMODULE |
| GCW_MENUNAME | GCL_MENUNAME |
| GCW_STYLE | GCL_STYLE |
GetClassLong, RegisterClass, SetClassLong, SetClassWord