An application sends an LB_SETCOLUMNWIDTH message to a multiple-column list box (created with the LBS_MULTICOLUMN style) to set the width, in pixels, of all columns in the list box.
LB_SETCOLUMNWIDTH
wParam = (WPARAM) cxColumn; // column width in pixels
lParam = 0; // not used; must be zero
Parameters
cxColumn
Value of wParam. Specifies the width, in pixels, of all columns.
Return Values
This message does not return a value.
See Also