How can I use VPrt in WinHelp Callbacks?
Posted: Sun Aug 29, 2004 11:56 am
Hello community,
I want to use the callback function from WinHelp. To initialize the callbacks it is necessary to use VPrt (Virtual Pointer).
Does anybody knows what VPrt are and how can I use it?
The code looks like this:
If anybody has a special tip to the specific problem or a code snippet, please let me know.
Thanks.
Bye
Stefan
I want to use the callback function from WinHelp. To initialize the callbacks it is necessary to use VPrt (Virtual Pointer).
Does anybody knows what VPrt are and how can I use it?
The code looks like this:
Code: Select all
ProcedureDLL.l LDLLHandler(wMsg.w, lParam1.l, lParam2.l)
Select wMsg
Case 1 ;DW_WHATMSG
ProcedureReturn 4 | 16 | 2 ;DC_JUMP | DC_CALLBACKS | DC_INITTERM
Case 4 ;DW_INIT
ProcedureReturn 1
Case 7 ;DW_ENDJUMP
MessageRequester("LGetInfo", Str(LGetInfo), #PB_MessageRequester_Ok)
;Order CallFunctionFast and the adress of the procedure LGetInfo
;TopicNo.l = CallFunctionFast(LGetInfo, 0, 7) ;<-Program crash here
MessageRequester("Jump ", "End" + CrLf + Str(lParam1) + CrLf + Str(lParam2) + CrLf + Str(TopicNo), #PB_MessageRequester_Ok)
ProcedureReturn 1
Case 10 ;DW_CALLBACKS
;Here I get the pointer to VPtr with lParam1
;and I need LGetInfo, the 15th element of the VPtr array (?)
LGetInfo.l = lParam1 + (15 * 4)
ProcedureReturn 1
EndSelect
EndProcedure
Thanks.
Bye
Stefan