Contributor: SWAG SUPPORT TEAM SECTION 9 - Windows API This document contains information that is most often provided to users of this section. There is a listing of common Technical Information Documents that can be downloaded from the libraries, and a listing of the five most frequently asked questions and their answers. TI607 How to print in windows. Q. "How can I enable or disable a particular control in a dialog box?" A. Use the EnableWindow(Wnd: Hwnd, Enable: Bool) API function. It takes two parameters, the handle to the window (remember a control is a window) to be enabled/disabled and a boolean value - True for enable and False for disable. Q. "How do I obtain the handle or ID of a control?" A. If you have a pointer to a control object, OWL will give you the window handle automatically through the HWindow field; PointerToMyControl^.HWindow is the window handle. If you know the handle of a control, you can obtain the ID by calling the GetDlgCtrlID() API function: ControlID := GetDlgCtrlID(ControlHandle); If you don't have a pointer to your control, but know the ID of a control, you can obtain the handle by calling the GetDlgItem() API function: ControlHandle := GetDlgItem(DialogHandle, ControlID); Q. "How do I unload an abnormally terminated program's dlls?" A. By using GetModuleHandle to return the dll's handle, and then call freelibrary until GetModuleHandle returns 0. If a dll has loaded another dll, unload the child dll first. Q. "How do I hide a minimized icon without taking the program off the task list?" A. Move the icon off the display using SetWindowPos or MoveWindow and give negative coordinate values beyond the screen. Q. "How do I change a dll's data segment from fixed to movable?" A. Call GlobalPageUnloch(DSEG) in the outer block of your dll. This will work providing the dll does not contain code that requires a page locked data segment.