Question about Requesters

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Fri, 2024-06-14 12:24
#1
OldFart
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Question about Requesters

Hi,

When using a requester that has tag REQ_TimeOutSecs defined (with a value > 0) and subsequently the requester DOES time out, what is then the return value of the method? Do I correctly assume this to be 0? Or?

  1. void VARARGS68K MessageBox(struct ExecParam *xn, ...)
  2. {
  3. INFO_ENTER
  4.  
  5.  va_list ap; 
  6.  va_startlinear(ap, xn);
  7.  IExec->RawDoFmt((__RD)->rd_FormatText, va_getlinearva(ap, void*), NULL, (__RD)->rd_BodyText);
  8.  va_end(ap);
  9.  
  10.  struct TagItem  ReqTags[] = {{REQ_Type       ,         (__RD)->rd_Type}
  11.                              ,{REQ_TitleText  , (uint32)(__RD)->rd_TitleText}
  12.                              ,{REQ_GadgetText , (       (__RD)->rd_GadgetText) ? ((uint32)(__RD)->rd_GadgetText)
  13.                                                                                : ((uint32)  INFO_GADGETTEXT)}
  14.                              ,{REQ_BodyText   , (uint32)(__RD)->rd_BodyText}
  15.                              ,{REQ_TimeOutSecs, (uint32)(__RD)->rd_TimeOut}
  16.                              ,{REQ_Image      , (uint32)(__RD)->rd_Image}
  17.                              ,{TAG_END        , (uint32)0}
  18.                              };
  19.  
  20.  struct orRequest ReqMsg   = {RM_OPENREQ, ReqTags, (__RD)->rd_Window, (__RD)->rd_Screen};
  21.  
  22.  if (rd->rd_WinObj != NULL)
  23.   {
  24.    IIntuition->SetAttrs(*(__RD)->rd_WinObj, WA_BusyPointer, TRUE, TAG_END);
  25.    (__RD)->rd_Response = IIntuition->IDoMethodA((__RD)->rd_ReqObj, (APTR)&ReqMsg);
  26.    IIntuition->SetAttrs(*(__RD)->rd_WinObj, WA_BusyPointer, FALSE, TAG_END);
  27.   }
  28.  else
  29.   {
  30.    (__RD)->rd_Response = IIntuition->IDoMethodA((__RD)->rd_ReqObj, (APTR)&ReqMsg);
  31.   }
  32.  
  33. INFO_VACATE
  34. }

And now that I'm at it, how would tag 'Req_VarArgs' fit in here? Would this cut that cake?

  1. void VARARGS68K MessageBox(struct ExecParam *xn, ...)
  2. {
  3. INFO_ENTER
  4.  
  5.  va_list ap; 
  6.  va_startlinear(ap, xn);
  7.  va_end(ap);
  8.  
  9.  struct TagItem  ReqTags[] = {{REQ_Type       ,         (__RD)->rd_Type}
  10.                              ,{REQ_TitleText  , (uint32)(__RD)->rd_TitleText}
  11.                              ,{REQ_GadgetText , (       (__RD)->rd_GadgetText) ? ((uint32)(__RD)->rd_GadgetText)
  12.                                                                                : ((uint32)  INFO_GADGETTEXT)}
  13.                              ,{REQ_VarArgs    , (uint32)va_getlinearva(ap, void*)}
  14.                              ,{REQ_BodyText   , (uint32)(__RD)->rd_FormatText}
  15.                              ,{REQ_TimeOutSecs, (uint32)(__RD)->rd_TimeOut}
  16.                              ,{REQ_Image      , (uint32)(__RD)->rd_Image}
  17.                              ,{TAG_END        , (uint32)0}
  18.                              };
  19.  
  20.  struct orRequest ReqMsg   = {RM_OPENREQ, ReqTags, (__RD)->rd_Window, (__RD)->rd_Screen};
  21.  
  22.  if (rd->rd_WinObj != NULL)
  23.   {
  24.    IIntuition->SetAttrs(*(__RD)->rd_WinObj, WA_BusyPointer, TRUE, TAG_END);
  25.    (__RD)->rd_Response = IIntuition->IDoMethodA((__RD)->rd_ReqObj, (APTR)&ReqMsg);
  26.    IIntuition->SetAttrs(*(__RD)->rd_WinObj, WA_BusyPointer, FALSE, TAG_END);
  27.   }
  28.  else
  29.   {
  30.    (__RD)->rd_Response = IIntuition->IDoMethodA((__RD)->rd_ReqObj, (APTR)&ReqMsg);
  31.   }
  32.  
  33. INFO_VACATE
  34. }

And then, whilst going through 'classes/requester.h', I encountered that very sexy sounding tag 'REQ_StayOnTop'. I'll try and see how that one can be fitted in.

OldFart

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Sat, 2024-06-15 08:55
msteed
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Re: Question about Requesters

I can't help with REQ_VarArgs, as I've never played with that. But for the timeout, the autodoc says:

For all [requester] types, returns -1 when a timeout occured or when an IDCMP event specified with REQ_IDCMP_Ptr occurred.

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Sat, 2024-06-15 11:11
(Reply to #2)
OldFart
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Re: Question about Requesters

@msteed

I missed that one. Thanks!

OldFart

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Sat, 2024-06-15 11:56
thomas
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Re: Question about Requesters

I am quite sure that every reference to ap is illegal after va_end(ap) and also the result of va_getlinearva becomes invalid after va_end. So you have to move va_end to the end of your function, at least after DoMethod.

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Sat, 2024-06-15 13:34
(Reply to #4)
OldFart
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Re: Question about Requesters

@thomas

I am quite sure that every reference to ap is illegal after va_end(ap) and also the result of va_getlinearva becomes invalid after va_end.

Sounds (and seems) logical. Thanks.

OldFart

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Tue, 2024-06-18 00:57
jabirulo
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Re: Question about Requesters

@OldFart

for the REQ_VarArgs, you can take a look in playcdda_gui.c (os4depot)
http://www.os4depot.net/share/audio/play/playcdda_gui.lha

or this one:

  1. VARARGS68K VOID SV_Message(CONST_STRPTR text, ...)
  2. {
  3. 	ULONG idcmp = 0L;
  4. 	struct EasyStruct estr;
  5. 	va_list args;
  6. 	ULONG *vargs = NULL;
  7.  
  8. #if defined(__amigaos4__)
  9. 	va_startlinear(args,text);
  10. 	vargs = va_getlinearva(args,ULONG *);
  11. #else
  12. 	va_start(args,text);
  13. 	vargs = args;
  14. #endif
  15.  
  16. 	if(RequesterBase)
  17. 	{
  18. 		struct Screen *scr = LockPubScreen(NULL);
  19. 		Object *req = NewObject(RequesterClass, NULL,
  20. 						REQ_Image,      REQIMAGE_WARNING,
  21. 						REQ_TitleText,  GETMSG(MSG_AKDT_MESSAGE),
  22. 						REQ_BodyText,   text,
  23. 						REQ_VarArgs,    vargs,
  24. 						REQ_GadgetText, GETMSG(MSG_INFOWIN_OK),
  25. 					TAG_DONE);
  26. 		if(req)
  27. 		{
  28. 			//SETWINDOWBUSY(TRUE);
  29. 			IDoMethod(req, RM_OPENREQ, NULL, NULL, scr);
  30. 			//SETWINDOWBUSY(FALSE);
  31. 			DisposeObject(req);
  32. 		}
  33. 		UnlockPubScreen(NULL, scr);
  34. 		va_end(args);
  35. 		return;
  36. 	}
  37.  
  38. 	if(!IntuitionBase) IntuitionBase = OpenLibrary("intuition.library", 37);
  39. 	if(!IntuitionBase) return;
  40.  
  41. 	estr.es_StructSize   = sizeof(struct EasyStruct);
  42. 	estr.es_Flags        = 0L;
  43. 	estr.es_Title        = GETMSG(MSG_AKDT_MESSAGE);
  44. 	estr.es_TextFormat   = text;
  45. 	estr.es_GadgetFormat = GETMSG(MSG_OK);
  46.  
  47. 	EasyRequestArgs(NULL, &estr, &idcmp, vargs);
  48.  
  49. 	va_end(args);
  50. }

AOS4.1/SAM460ex/PPC460EX-1155MHZ/2048MB/RadeonHD6570/SSD120GB/DVDRW :-P

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Tue, 2024-06-18 16:53
(Reply to #6)
OldFart
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Re: Question about Requesters

@Jabirulo

Thanks!

OldFart

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Thu, 2024-07-18 21:00
hypex
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Joined: 2011-09-09 16:20
Re: Question about Requesters

@OldFart

I encountered that very sexy sounding tag

LOL. Also, if you are also to target DOS 51.12+, then you can use TimedDosRequester(). Which provides a similar but simpler function to display a similar requester.

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