An application sends an EM_SETTABSTOPS message to set the tab stops in a multiline edit control. When text is copied to the control, any tab character in the text causes space to be generated up to the next tab stop.
This message is processed only by multiline edit controls.
EM_SETTABSTOPS
wParam = (WPARAM) cTabs; // number of tab stops
lParam = (LPARAM) (LPDWORD) lpdwTabs; // tab stop array
Parameters
cTabs
Value of wParam. Specifies the number of tab stops contained in the lpdwTabs parameter. If this parameter is zero, the lpdwTabs parameter is ignored and default tab stops are set at every 32 dialog box units. If this parameter is 1, tab stops are set at every n dialog box units, where n is the distance pointed to by the ldpwTabs parameter. If the cTabs parameter is greater than 1, lpdwTabs points to an array of tab stops.
lpdwTabs
Value of lParam. Points to an array of unsigned integers specifying the tab stops, in dialog units. If the cTabs parameter is 1, lpdwTabs points to an unsigned integer containing the distance between all tab stops, in dialog box units.
Return Values
If all the tabs are set, the return value is TRUE; otherwise, it is FALSE.
Remarks
The EM_SETTABSTOPS message does not automatically redraw the edit control window. If the application is changing the tab stops for text already in the edit control, it should call the InvalidateRect function to redraw the edit control window.
See Also