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Hi,
Can anyone point me to some information on how to add and retrieve blob data from an Access database, using Visual C++ 6 (not .Net)
Thanks,
ns
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I dont know. All I know is that we want to store pictures in a database ( ACCESS), and then retrieve them and show them. I dont know if we could just input them as char*. The embeded nulls in the binary data might be a problem. I really am very new at this, so any help is greatly appreciated!
Thanks,
ns
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Nishant S wrote:
Does Access have a blob data type? I am not sure. There's something called memo but even that is a limited size field I think
Access has both memos and blobs.
Tomasz Sowinski -- http://www.shooltz.com
What is "scratch" and why can everything be made from it?
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Not sure how to do it using ADO but in principal it should be the same as ODBC.
In ODBC the data will come through as a :
SQL_C_BINARY | SQLCHAR * | unsigned char *
You can load the data into a void pointer and then write it to a file. I did this around 5 years ago. Selected BLOBs of image files from Oracle and wrote it to the drive.
Just cannot recall the exact syntax. But essentially you will get the data in some binary form. Check the ADO documentation. It may come through as a BSTR*.
Hope this helps.
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I've been learning C++ 6.0 and have been doing well. I got a copy of C++.net and there are some things that are confusing me.
In 6.0 functions like this are perfectly legal and I have no problems with them:
CLine* CDrawingDoc::AddLine(CPoint ptFrom, CPoint ptTo)
Whenever I try adding any overloaded function to my project in .Net I get an error message that calls it an "Invalid identifier name." Has anyone got any ideas I could use for this? Do I have to add the functions manually?
I really appreciate your time.
Thanks
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After using MFC to create an SDI the first thing I do is add a class "CLine" and then 2 member variables m_pfFrom and m_ptTo. I then try adding a function to my class to initialize the from and to points.
Return type blank: and a function name of
CLine(CPoint ptFrom, CPoint ptTo)
I think either I am doing somehting wrong in the wizard or there is a different procedure for this. Like I said, I am quite new to this. In VS6 I have no problems adding functions like this, in .Net I do. I'd really like to start using .Net, so if someone would please advise me on this I would really appreciate it a lot.
Thanks
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After using MFC to create an SDI the first thing I do is add a class "CLine" and then 2 member variables m_pfFrom and m_ptTo. I then try adding a function to my class to initialize the from and to points.
Return type blank: and a function name of
CLine(CPoint ptFrom, CPoint ptTo)
I think either I am doing somehting wrong in the wizard or there is a different procedure for this. Like I said, I am quite new to this. In VS6 I have no problems adding functions like this, in .Net I do. I'd really like to start using .Net, so if someone would please advise me on this I would really appreciate it a lot.
Thanks
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G. White wrote:
CLine(CPoint ptFrom, CPoint ptTo)
I presume you are entering the whole prototype into the edit box. In VS 7 you do it different. Just enter the name of the function into the edit box. You enter the arguments into the list separately.
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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Thanks a lot! I would never have figured it out! 
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Hello White
Could you please change your CP email ID. Seems as if your CP id is an old one you don't use anymore. I just got a bounce of the mail notification. Or could you at least turn off notification as otherwise everyone who replies to you would get bounced notify mails.
----- Original Message -----
From: <zenix1@mailcity.com>
To: "Nishant S" <nish@in.inapp.com>
Sent: Wednesday, August 07, 2002 8:54 PM
Subject: Re: [CodeProject] Re: Help? I'm new.
> I no longer use this email. Get lost!
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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I shut off the auto reply feature, I'm sorry. I was getting a lot of spam and it really irritated me.
Thanks
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The sooner you wean yourself off the wizards and add things by hand, the better off you will be.
Christian
We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )
Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002
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How do i make a pointer to point to a function.
and i hope to have this pointer to be able to point to several type of functions?
like
CString getDate();
CString getMonth(int i);
how can make a pointer to point either to these two functions??
thanxs in advance
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aldeba wrote:
how can make a pointer to point either to these two functions??
You can't. The signatures of functions are different - getDate doesn't have arguments, while getMonth takes one integer argument.
Why would you like to have one pointer which can point to either of these functions?
Tomasz Sowinski -- http://www.shooltz.com
What is "scratch" and why can everything be made from it?
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you can use a void * pointer to point at either function:
void *p = getDate;
p = getMonth;
-c
WWJD? JWRTFM.
found on /.
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just tak ein to a void pointer .after that cast them in to appropriate funtion type..
Renjith-CPian.
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Hi,
On the dialog-based application, I put the Hide Dialog button, and the code for : OnHideDialog() is like:
ModifyStyle(WS_SHOWWINDOW, 0,0);
When I click the Hide Dialog button, it seems like the dialog is like a ghost, it's there but the window behind it receives the focus.
Can anyone explain me why and how to fix it ?
Thanks
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Try with ShowWindow(SW_HIDE) instead.
Tomasz Sowinski -- http://www.shooltz.com
What is "scratch" and why can everything be made from it?
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Like someone else said you should use ShowWindow. But, to be precise, it's the WS_VISIBLE style you'd want to remove: ModifyStyle( WS_VISIBLE, 0, 0 );
Joel Lucsy (jjlucsy@ameritech.net)
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I keep receiving an error when i am working with my .rc and resource.h saying that they have been modified outside of visual studio, and asking if i want to reload them.. i am the only person using the software, or editing the files, and it just asked me the same thing and reloaded them a few minutes ago.. i keep getting this error about reloading the resource, what could cause this? i think this may somehow be related to my other main problem i posted last night.
which can be found here:
http://www.codeproject.com/script/comments/forums.asp?forumid=1647&fr=26#xx252677xx[^]
any ideas on either thing? .net is actin real screwy..
-dz
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Chances are it is your AV software getting in the way. This has been a problem long before .NET.
Tim Smith
"Programmers are always surrounded by complexity; we can not avoid it... If our basic tool, the language in which we design and code our programs, is also complicated, the language itself becomes part of the problem rather that part of the solution."
Hoare - 1980 ACM Turing Award Lecture
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