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Christian Graus wrote: This is a member variable, have you created it ? If not, this code snippet will indeed give you the error you describe
what all do i have to do to create it? i have never done this before i am still trying to learn programming in my spare time.
thank you again for the help
- Kyle
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You're suffering from a common problem. You want to build the Eiffel Tower, and you're yet to build a sandcastle. Instead of copying and pasting code almost at random, you should buy a beginner book on C++, and work through it. Then, when you can interpret the code you're copying, you may have a shot at making it work.
Yes, if we posted back and forth four more times, we might get past this problem, but it would not help you in the long run. You're biting off more than you can chew. Buy a book ( teach yourself C++ in 24 hours is a good one ), and ask questions here when you get stuck, but work through it. Then try a few simpler projects, before you start trying to manipulate COM objects and otherwise use more complex APIs.
Christian Graus - Microsoft MVP - C++
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How to use GridCtrl? Please tell me, thankyou!
czh
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What grid control ?
Christian Graus - Microsoft MVP - C++
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does anyone here ever seen a linux-style copy-paste function for windows (I would assume it will be a shell extension)?
I mean, copy by marking (whatever you mark goes into the clipboard) and paste with the middle button.
Best
Noam
Noam Ben Haim
Project Leader
MobilEye
noam.benhaim@mobileye.com
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Nope. But it can be implemented in an app or even system wide.
Regards,
Yakov
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I created a List Control(CListCtrl) with Report type, and I created two columns for it.
I've been able to have the List Control display my data looked up from a database.
and now I want to modify the data in the List Control and write back to the database, is it possible to do this with List Control? if not, what should I do?
by the way, generally I want to keep the look of the report-type List Control.
any info is appreciated!
-------------------
I am learning C++ and English
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The list control can neither read from or write to your database. But in the same way that you've looked up data and displayed it, so long as you're retrieving the primary key for records in the database, there's no reason you can't write back changes.
Christian Graus - Microsoft MVP - C++
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I retrieve the record in the database with a CDaoRecordSet object.
of course I write back data with this CDaoRecordSet , too, but it seems that the data in the List Control can not be changed by the user, this is the problem .
besides,is CDaoRecordView an alternative?
-------------------
I am learning C++ and English
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Oh, I see. You need the MSFlexGrid, or Chris Maunders grid control ( on this site ). They give you a more flexible control than the listControl.
Christian Graus - Microsoft MVP - C++
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I don't have permission to access that image.
I believe that either a list control or a list view allows editing, but you need to write a bit of code to make it work. You should check out the C++ controls section of the site.
Christian Graus - Microsoft MVP - C++
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I see ,thank you so much all your help
-------------------
I am learning C++ and English
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Hello,
in good old Atari-days I used to love my ramdisk. On PC this doesn't seem to be a serious topic (I wonder why).
Compilation-time is the dominant bottleneck for most C++-programmers. So, in times of GB-Ram: why not use a ramdisk to reduce the heavy amount of harddisk-access?
Has anyone experience in setting up such an environment?
(which ramdisk? how large? what moved to the ramdisk: the temp-dir? the PCH? the whole project-files? how to setup this in VC++ ?
expected speed-gain?)
Thanks
Christof
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Christof Schardt wrote: On PC this doesn't seem to be a serious topic
The current generation of PC's and Windows has overall better performance when any 'extra' available RAM is left to the operating system. Windows uses a portion of free RAM as a disk cache (there's the RAM disk you wondered about). The advantage today is that the O/S manages it for you, and you don't have to worry about copying files back and forth.
There are a number of things you can do to improve build performance. Make sure that any header files that don't change a lot are included in your precompiled headers. Break your projects into smaller pieces that are linked into the final application as object libraries (.LIB's), or even at runtime as DLL's. Your objective here is to reduce the amount of code that gets recompiled when you make changes, rather than to decrease the overall compile time itself. Most of the time, you are working on a small portion of the code, and don't need to recompile the whole thing.
Software Zen: delete this;
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You can also try to use the
#pragma once
in your header fils so they are not parsed multiple times, even if included multiple times.
I also find that keeping my HD defragmented helps a lot too.
If you run a virus scanner with 'on access' scanning, disable the folders containing your source files.
Disable some output options you might not use, such as class browser (I don't use it, speeds up build times since not making the BSC file for each project).
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Of course I have an include-guard in all my headers.
BTW:
Is there a difference between
<br />
#pragma once<br />
...
and
<br />
#ifnded XY_INCLUDED<br />
#define XY_INCLUDED<br />
...
#endif<br />
or is it just a MS-shorthand for this?
Thanks anyway for your additional hints.
Christof
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I do not know for certain.
It is my suspicion that the #pragma once will cause the file to be added to a table that it has already been processed, whereas the #ifndef does not necessarily preclude reparsing of the entire header, as one does not necessarily include or preclude the entire file within the confines of an #ifndef/#endif set.
The #pragma once, however, seems to imply, "hey, once you read this file for this compilation unit, don't bother reading it again". I favor adding the #pragma once if I now a header would never require reparsing within a single compilation unit. I prefer to create headers that do not depend upon such reparsing activity.
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Christof Schardt wrote: On PC this doesn't seem to be a serious topic (I wonder why).
I used a RAM disk exhaustively back with MS-DOS and Windows 3.x. It was a real time saver for compilations.
"Take only what you need and leave the land as you found it." - Native American Proverb
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hi all
ive made an activex control (button) but i dont know how to insert it into another application window. but i don know how?
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Can someone give me an advice?
I use mciSendString() (a c++ .dll)
how can came back from fullscreen to windowed mode?
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Hello everybody.I am new in this forum.I would like to know how to connect to an SQL server 2000 database by using C++ using ODBC. I have found a way of connecting to the database by using the AppWizard but i want to know if there is another way also.
The second question i would like to ask is how to connect to an ODBC sql server 2000 database by using the C language and not C++.
I would be grateful to anyone who can help me.
Thank you.
A.K.Silot
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It's very simple just try to find in the books, e.g Kruglinski.
Get the spirit if tomorrow
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First you'll need to create a DSN. Check out Administrative Tools --> Data Sources (ODBC). Then your code can use that DSN to communicate with the database.
"Take only what you need and leave the land as you found it." - Native American Proverb
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-I have gotten the handle "HWND" of the window then how can i get it name ?
-Are there any way to get all the name of all process are running on te computer?
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