prop_clienthandle.htm
| Navigation: Language Reference > App C - PROP: Runtime Properties > Complete Property List >====== PROP:ClientHandle ====== |    |
WINDOW property which returns the client window handle (the area of the window that contains the controls) for use with low-level Windows API calls that require it. (READ-ONLY)
Example:
| WinView WINDOW('View'),AT(0,0,320,200),MDI,MAX,HVSCROLL |
| END |
| MessageText CSTRING('You cannot exit the program from this window ') |
| MessageCaption CSTRING('No EVENT:CloseDown Allowed ') |
| TextAddr LONG |
| CaptionAddr LONG |
| RetVal SHORT |
| CODE |
| OPEN(WinView) |
| ACCEPT |
| CASE EVENT() |
| OF EVENT:CloseDown |
| TextAddr = ADDRESS(MessageText) |
| CaptionAddr = ADDRESS(MessageCaption) |
| RetVal = MessageBox(WinView{PROP:ClientHandle},TextAddr,CaptionAddr,MB_OK) |
| !Windows API call using a window handle |
| CYCLE !Disallow program closedown from this window |
| END |
| END |
prop_clienthandle.htm.txt · Last modified: 2021/04/15 15:57 by 127.0.0.1