| WORD SetClassWord(hwnd, nIndex, wNewWord) | |||||
| HWND hwnd; | /* handle of window | */ | |||
| int nIndex; | /* index of value to change | */ | |||
| WORD wNewWord; | /* new value | */ | |||
This function replaces the word specified by the nIndex parameter in 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 word to be changed.
wNewWord
Specifies the replacement value.
The return value specifies the previous value of the specified word.
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 four-byte value and so on.
Use the SetClassLong function to set the following system-defined values:
| Old SetClassWord Index | New SetClassLong 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 |
GetClassWord, GetClassLong, SetClassLong