optimization
in [MFC]
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From: David Lowndes on 20 Mar 2010 06:11 >So to conclude, the speed problem can be solved by using SetItemCount() >instead ot InsertItem() many times. But the upper limit on the number of >items in a CListCtrl is one hundred million (plus one). Memory is not the >issue, because task manager shows the memory usage is the same before and >after adding the 100 million items with SetItemCount(). So the limit seems >to be arbitrary. Bill, Which OS is this on? It might be worthwhile adding a comment to the online MSDN documentation to record your findings. Dave
From: "Bill Brehm" don't want on 20 Mar 2010 10:30 Dave, I'm running WinXP, but probably more importantly, MSVC++ 6.0. I'll look for this online MSDN and see what I can find / record. Bill "David Lowndes" <DavidL(a)example.invalid> wrote in message news:um79q51bl781o4rntmmfrt0bbfmm8fjc8r(a)4ax.com... > >So to conclude, the speed problem can be solved by using SetItemCount() >>instead ot InsertItem() many times. But the upper limit on the number of >>items in a CListCtrl is one hundred million (plus one). Memory is not the >>issue, because task manager shows the memory usage is the same before and >>after adding the 100 million items with SetItemCount(). So the limit seems >>to be arbitrary. > > Bill, > > Which OS is this on? > > It might be worthwhile adding a comment to the online MSDN > documentation to record your findings. > > Dave
From: Giovanni Dicanio on 23 Mar 2010 07:09 "Bill Brehm" <don't want spam> ha scritto nel messaggio news:uZ1EiF9xKHA.2436(a)TK2MSFTNGP04.phx.gbl... > So to conclude, the speed problem can be solved by using SetItemCount() > instead ot InsertItem() many times. But the upper limit on the number of > items in a CListCtrl is one hundred million (plus one). Would it be possible to you to test using SetItemCountEx instead of SetItemCount? http://msdn.microsoft.com/en-us/library/xb95w29a(VS.80).aspx http://msdn.microsoft.com/en-us/library/bb775095(VS.85).aspx <quote> If the list-view control was created with the LVS_OWNERDATA style, this macro sets the virtual number of items that the control contains. If the list-view control was created without the LVS_OWNERDATA style, the ListView_SetItemCount macro should be used. </quote> Giovanni
From: "Bill Brehm" don't want on 23 Mar 2010 20:03 I did try SetItemCountEx() as well and got the same result. I do have LVS_OWNERDATA set in the properties of the control in the resource view. I shuold point out that I'm using MSVC++ version 6. Maybe in newer versions the limitation has been removed??? "Giovanni Dicanio" <giovanniDOTdicanio(a)REMOVEMEgmail.com> wrote in message news:ObPlElnyKHA.2644(a)TK2MSFTNGP04.phx.gbl... > "Bill Brehm" <don't want spam> ha scritto nel messaggio > news:uZ1EiF9xKHA.2436(a)TK2MSFTNGP04.phx.gbl... > >> So to conclude, the speed problem can be solved by using SetItemCount() >> instead ot InsertItem() many times. But the upper limit on the number of >> items in a CListCtrl is one hundred million (plus one). > > Would it be possible to you to test using SetItemCountEx instead of > SetItemCount? > > http://msdn.microsoft.com/en-us/library/xb95w29a(VS.80).aspx > > http://msdn.microsoft.com/en-us/library/bb775095(VS.85).aspx > > <quote> > If the list-view control was created with the LVS_OWNERDATA style, this > macro sets the virtual number of items that the control contains. > If the list-view control was created without the LVS_OWNERDATA style, the > ListView_SetItemCount macro should be used. > </quote> > > Giovanni > >
From: Giovanni Dicanio on 24 Mar 2010 08:19
"Bill Brehm" <don't want spam> ha scritto nel messaggio news:#ScAsVuyKHA.2552(a)TK2MSFTNGP04.phx.gbl... > I did try SetItemCountEx() as well and got the same result. I do have > LVS_OWNERDATA set in the properties of the control in the resource view. I > shuold point out that I'm using MSVC++ version 6. Maybe in newer versions > the limitation has been removed??? I tried a quick test building a dialog-based MFC app with VS2010 RC. Basically, the dialog hosts a virtual list control, that has two columns: the first one shows the index value (e.g. 0,1,2,3...,<count-1>), the second one is just left empty. I built the app in 64-bit and run the test: my results on Windows 7 x64 are that the virtual list control displays properly for count <= 100,000,000. Instead, for count > 100,000,000 an empty list is displayed. Weird... Giovanni |