An application sends the WM_COPY message to an edit control or combo box to copy the current selection to the clipboard in CF_TEXT format.
WM_COPY wParam = 0; // not used; must be zero lParam = 0; // not used; must be zero
This message has no parameters.
This message does not return a value.
When sent to a combo box, the WM_COPY message is handled by its edit control. This message has no effect when sent to a combo box with the CBS_DROPDOWNLIST style.