On-the-Fly?
April 11, 2002 09:43 PM
What''s the difference between initializing the windows struct paramters with the blah = blah and the just : blah? I heard the latter was called setting it on-the-fly. Is there any difference between setting them like this?
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Always will be smarter
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--=ME=--
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Wachar's Eternity <-<-<-<-<- Me own site!
122
April 12, 2002 05:23 AM
huh?
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April 12, 2002 05:18 PM
It says something about on-the-fly in Lamoth''s book. Top of page 74. I''ll show you...
Regular declarations.
On-The-Fly
I heard that creating anything on-the-fly is bad. What''s the difference between the above and below examples?
Regular declarations.
WNDCLASSEX winclass;winclass.cbSize = sizeof(WINDCLASSEX);winclass.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW | CS_VREDRAW;winclass.lpfnWndProc = WindowsProc;winclass.cbClsExtra = 0;winclass.cbWndExtra = 0;winclass.hInstance = hinstnace;winclass.hIcon = LoadIcon(NULL, IDI_PPLICATION);wincalss.hCursor = LoadCursor(NULL, IDC_ARROW);winclass.hbrBackground = GetStockObject(BLACK_BRUSH); On-The-Fly
WNDCLASSEX winclass = {winclass.cbSize = sizeof(WNDCLASSEX);//Then all of the things below except, without the winclass.//thingys and the name. Like instead of hCursor = LoadCursor//(NULL, IDC_ARROW);, do: LoadCursor(NULL, IDC_ARROW).//It''s just taking out all the things before the = sign.}; I heard that creating anything on-the-fly is bad. What''s the difference between the above and below examples?
Wachar's Eternity <-<-<-<-<- Me own site!
2,123
April 12, 2002 07:30 PM
In the second version (on-the-fly, as you call it) you''re depending on the structure fields occurring in memory in a specified manner, and being byte-aligned the same as your code. Which, of course, you are not guaranteed. So don''t do it.
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Thanks to Kylotan for the idea!
[ GDNet Start Here | GDNet Search Tool | GDNet FAQ | MS RTFM [MSDN] | SGI STL Docs | Google! | Asking Smart Questions ]
Thanks to Kylotan for the idea!
April 12, 2002 08:17 PM
Ok, thanks!
----------------------
Always will be smarter
than you,
--=ME=--
----------------------
----------------------
Always will be smarter
than you,
--=ME=--
----------------------
Wachar's Eternity <-<-<-<-<- Me own site!
April 12, 2002 10:59 PM
But, then, why do people use it?!
----------------------
Always will be smarter
than you,
--=ME=--
----------------------
----------------------
Always will be smarter
than you,
--=ME=--
----------------------
Wachar's Eternity <-<-<-<-<- Me own site!
122
April 12, 2002 11:49 PM
Some people use it just for the speed increase in typing. I see no other benefit from its use.
And if Microsoft ever decides to change around their WNDCLASS data structure, and you happen to recompile using this new WNDCLASS structure, you are surely likely to get errors due to filling in the data structure improperly.
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And if Microsoft ever decides to change around their WNDCLASS data structure, and you happen to recompile using this new WNDCLASS structure, you are surely likely to get errors due to filling in the data structure improperly.
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If I''m incorrect, sue me, you''ll get nothing
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