OS2 basics

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2 total messages Started by Elber Gershon Mon, 27 Jul 1992 16:34

#504

Author: Elber Gershon
Date: Mon, 27 Jul 1992 16:34

27 lines
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o.k. OS2 gurus, here is a one (actually two) for you.

* From the books I have which are not for version 2.0 (mainly for 1.1/2), it
  seems their is no way a process can be forked from the command line (i.e
  cmd.exe) and open a PM window while having stdin/out in contact.
	If process A is forked from cmd.exe and process A DosExecPgm
  process B in EXEC_BACKGROUND, then process B can open a PM window while
  process A still have stdin/out. The two processes A and B can then talk
  via pipes.
	The above works but, as expected, is not fast. Is there a way to
  do the above with a single process? That is, can a single process in
  OS2 2.0 open a PM window and have stdin/out intact? Can it be done with a
  thread creation instead of a new process? Sample code will be appreciated.

* What is the fastest way of drawing horizontal lines? Is GpiLine optimized
  for horizontal lines? Is it the OS2 kernel that draw the lines (DDA)
  or is it the display driver?

thanks

Gershon

  
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
Elber Gershon                            gershon@cs.utah.edu
918 University village                   Tel: (801) 582-1807 (Home)
Salt Lake City, Utah 84108-1180          Tel: (801) 581-5642 (Work)

Re: OS2 basics

#531

Author: David Charlap
Date: Tue, 28 Jul 1992 17:36

25 lines
1614 bytes

In article <1992Jul27.103401.19641@hellgate.utah.edu> gershon%gr.cs.utah.edu@cs.utah.edu (Elber Gershon) writes:
>o.k. OS2 gurus, here is a one (actually two) for you.
>
>* What is the fastest way of drawing horizontal lines? Is GpiLine optimized
>  for horizontal lines? Is it the OS2 kernel that draw the lines (DDA)
>  or is it the display driver?

Use GpiLine.  I don't know how optimized it is, but it's the only way
I know of.  (You really don't want to plot pixels or draw degenerate
polygons!)  I believe the functions are optimized, however, so there
shouldn't be a problem.

Also, by using the standard API calls, your program will improve as
the system DLLs are upgraded in the future.

Finally, the graphics work is a cooperative effort between the display
driver and the PM*.DLL files.  The display.dll handles the device-
specific work, and the pm*.dll files handle the generic device-
independant work.

-- 
   |)  David Charlap           "I don't even represent myself
  /|_  dic5340@hertz.njit.edu   sometimes so NJIT is right out!.
 ((|,)
  ~|~  Hi! I am a .signature virus, copy me into your .signature file.

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