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SECTION 14 - 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.