How to get the bits from a DIB? - C / C++ / MFC Discussion Boards

Tryhard30-Oct-01 18:22

30-Oct-01 18:22

Hi all,

I am trying to update a record in an Access Database(I am new to DB programming and VC++), from everything I have read the following code should acheive the desired result but it gives a DB exception.

Have I missed a readonly flag or got something wrong in my database.open command???

Any pointers greatly appreciated,
Thanks in advance,
Tryhard

Code:-

CDatabase database;
CString sSql;
CString sDriver = "MICROSOFT ACCESS DRIVER (*.mdb)";
CString sDsn;
CString sFile = "d:\\Docs\\Wayne\\C\\Converse\\CDAT.mdb";

TRY
{
// Build the creation string for access without DSN

sSql.Format("ODBC;DRIVER={%s};DSN='';DBQ=%s",sDriver,sFile);

// Open the database
database.Open(NULL,false,false,sDsn);

// Allocate the recordset
CRecordset recset( &database );

// Update data
sSql = "UPDATE Convhist "
"SET GREETINGCOUNT = '1'"
"WHERE YOURFIRSTNAME = 'WAYNE'";

// Execute SQL Statement
database.ExecuteSQL(sSql);

// Close the database

database.Close();

}
CATCH(CDBException, e)
{
// If a database exception occured, show error msg
AfxMessageBox("Database error: "+e->m_strError);
}
END_CATCH;
} Confused | :confused:

Tryhard

Re: Access Database woes...

solex30-Oct-01 23:32

solex

30-Oct-01 23:32

Are you sure that your database could be opened? You are not checking the return value.
The rest of the code is fine, but there is no need for a CRecordset.
What does the error string say?

A vast majority of our imports comes from outside the country.
George W. Bush

VC++ Standard and Unicode

Matt Newman30-Oct-01 16:40

Matt Newman

30-Oct-01 16:40

I have VC++ Standard Edition and I am going to install it on Win XP how do I install it so that it supports creating unicode projects? Thanks.

-Matt Newman
-Matt Newman

Re: VC++ Standard and Unicode

Michael Dunn30-Oct-01 17:07

Michael Dunn

30-Oct-01 17:07

Your choices are 1) Do a full install of MFC (the shared and static libraries for Unicode, as they're called) so the files are copied to your HD; or 2) do a default install and keep the VC CD in your drive. Setup will set the VC lib path to point at the LIB files on the CD.
In the end, though, you don't save space with #2, because when you apply a service pack, the LIBs can only go one place - your HD.

--Mike--
http://home.inreach.com/mdunn/
This posting is provided "as was" with no warranties, guarantees, lotteries, or any of those little bags of peanuts you get on planes. You assume all risk for crossing the street without holding mommy's hand. © 2001 Mike's Classy Software. Member FDIC. If rash develops, discontinue use.
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Re: VC++ Standard and Unicode

Matt Newman31-Oct-01 11:23

Matt Newman

31-Oct-01 11:23

How do I add unicode to a project (new or old) under new MFC AppWizard the only platform option is Win32. I am running XP on NTFS. I know I installed all the Unicode Libs.

-Matt Newman
-Matt Newman

Re: VC++ Standard and Unicode

Michael Dunn31-Oct-01 17:06

Michael Dunn

31-Oct-01 17:06

Open your workspace and go Build->Configurations. Click Add and copy the settings from your Debug build, and call the new one Debug Unicode or something like that. Repeat for the Release Unicode config.
Once that's done, you'll have two new targets. Go to your project settings and for those two new targets, on the C++/General tab, change _MBCS to _UNICODE.

--Mike--
http://home.inreach.com/mdunn/
If there's something strange / in your VC code / Who you gonna call? / Ghostbusters!
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Re: VC++ Standard and Unicode

Matt Newman1-Nov-01 13:30

Matt Newman

1-Nov-01 13:30

Thanks. It is a lot easier than it seems.

-Matt Newman
-Matt Newman

How to get the bits from a DIB?

clintsinger30-Oct-01 14:22

clintsinger

30-Oct-01 14:22

I have a DIB where I need to access the pixel values so I can read and write to them. I have tried using CreateDIBSection but that doesn't seem to give me a pointer to the original image but rather an entirely new image. Is there some way to get create a pointer to the pixel data of the original DIB?

Please Help,
Clint

Re: How to get the bits from a DIB?

Christian Graus30-Oct-01 14:37

Christian Graus

30-Oct-01 14:37

Is it a DIB or a DIBSection ? If the latter, just use GetObject.

DIBSECTION dib;
GetObject(hBitmap, sizeof(DIBSECTION), dib);

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: How to get the bits from a DIB?

clintsinger31-Oct-01 6:03

clintsinger

31-Oct-01 6:03

What I have is a DIB that I get back from a third party DLL. It takes a raw buffer, decompresses it and sends back a 24-bit dib. I want to be able to now go in and access the original bits so I can modify them ( sharpen/ motion detection) as quickly as possible. Then draw them on the screen quickly afterwards.

Please Help,
Clint Smile | :)

Re: How to get the bits from a DIB?

C^hris L^osinger31-Oct-01 6:22

C^hris L^osinger

31-Oct-01 6:22

see the MSDN for BITMAPINFOHEADER . you have to understand how DIBs are setup, in order for you to be able to get at the pixels.

here it is in a nutshell:

a 24 bit DIB (one of the simplest of the DIBs) is usually a chunk of memory that starts with a BITMAPINFOHEADER structure. immediately after that struct are the pixel bytes.

pixel rows are generally stored in a bottom-up order, so the first pixel byte is the bottom-left pixel. (top-down DIBs have a negative height).

pixel rows are always a multiple of four bytes wide; they have padding bytes at the end, if necessary, to make the total number of row bytes equal to a multiple of four.

pixels are stored BGRBGRBGR... (Blue, Green, Red). three pixels per byte, no padding between pixels (except at row ends, when necessary).

-c

http://www.smalleranimals.com

Better than the Startup folder

Jason Hooper30-Oct-01 14:12

Jason Hooper

30-Oct-01 14:12

I know some programs automatically start when the Windows OS is launched, but they are not in the Startup menu. The best I've been able to figure out so far is that it is a registry addition you must make to load your program. Where should I be looking for more information about this?

Thanks,

Suspicious | :suss:

-Jason

Re: Better than the Startup folder

Christian Graus30-Oct-01 15:03

Christian Graus

30-Oct-01 15:03

There's two - Run and RunOnce ( which runs the program then deletes the entry ). I dunno where they are, I always find them by searching for 'RunOnce'.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Re: Better than the Startup folder

Michael Martin30-Oct-01 15:42

Michael Martin

30-Oct-01 15:42

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce

Michael Martin
Pegasystems Pty Ltd
Australia
martm@pegasystems.com
+61 413-004-018

"Don't belong. Never join. Think for yourself. Peace"
- Victor Stone

Re: Better than the Startup folder

Nish Nishant30-Oct-01 16:18

Nish Nishant

30-Oct-01 16:18

Put it in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run if you want it for all users

Nish

Re: Better than the Startup folder

Jason Hooper30-Oct-01 23:32

Jason Hooper

30-Oct-01 23:32

Hello. Thanks for responding so quickly. I've got a followup question:

    // add the key
<br>
    CRegKey key;
<br>
    key.Open(HKEY_LOCAL_MACHINE, "\\Software\\Microsoft\\Windows\\CurrentVersion\\Run");
    key.SetKeyValue("Igloo", "foo");
    key.Close();

This tends to ASSERT. Do you immediately spot anything wrong with the method I'm using to add a Name "Igloo" and a value "foo" (which will be the program's filespec.)

Suspicious | :suss:

-Jason

Re: Better than the Startup folder

solex30-Oct-01 23:37

solex

30-Oct-01 23:37

I'd say the \\Software\\... should be just Software\\.....

A vast majority of our imports comes from outside the country.
George W. Bush

Re: Better than the Startup folder

Rick Crone31-Oct-01 9:21

Rick Crone

31-Oct-01 9:21

In Win2000 in the control panel there is Scheduled Tasks. You can set this up there. It may just make the registery entry for you... but it is easy.

Strange owner-draw CButton problem...

Simon Walton30-Oct-01 13:39

Simon Walton

30-Oct-01 13:39

Not so much of a problem, since i've fixed it now with a workaround. But i am interested as to exactly why it happened.

I created a custom button, derived from cbutton (obviously). I overrode the drawitem function and a few others to do some mouseover effects. The button was drawn to look exactly the same as a standard windows 9x button. I wanted to create a highlight when the user clicked on the button. So, before drawing the rectangle for the border of the button, i created and selected a lighter grey brush for the highlight;

if(lpDrawItemStruct->itemState & ODS_SELECTED)
{
Create and select much lighter gray brush
Draw rectangle
Delete the brush
}

The problem is, when i release the mouse button, the lighter gray brush is still drawn, even though the button isn't selected. It stays there until the cursor moves out of the button's rectangle. Therefore, when drawitem is called, it can't be going through the above if since itemState is not going to contain ODS_SELECTED. I also checked this using TRACE. Anyone know why? It's probably blindingly obvious, but it's getting late and my head hurts. Dead | X|

My workaround was to invalidate the button during OnLButtonUp().

Simon

Resizing Icon In CRichEditView

Vinnie Drysdale30-Oct-01 12:18

Vinnie Drysdale

30-Oct-01 12:18

When I call CRichEditView::InsertFileAsObject, I can't figure out how to resize the file icon that appears in the rich edit control. I've tried overriding such things as COleContainerItem::OnGetItemPosition and calling COleContainerItem::SetItemRects, but either they do nothing or cause assertions. Thanks for the Help.

Debug symbols for WinXP

Sam C30-Oct-01 11:00

Sam C

30-Oct-01 11:00

Does anyone know where I can download the Debug symbols for Windows XP? Or is it part of the platform SDK? If so, is there a way to download that information independent of the other information on the SDK?

Thanks in advance for any answer. Sorry if this sounds all dicombobulated, had too much coffee trying to figure out a problem I'm having. :-|

Sam C
----
Systems Manager
Hospitality Marketing Associates

How to get browser version?

30-Oct-01 9:34

What's the easiest way to get IE browser version? I'm using: The "Machine generated IDispatch wrapper class(es) created by Microsoft Visual C++" called CWebBrowser2, and the IWebBrowser2 interface.

Re: How to get browser version?

Michael Dunn30-Oct-01 11:34

Michael Dunn

30-Oct-01 11:34

I think the most reliable way is to read the version resource (or call DllGetVersion) in shdocvw.dll. 4.71.* is IE 4, 4.72.* is IE 4.01, 5.* is IE 5, and 6.* is IE 6.

--Mike--
http://home.inreach.com/mdunn/
This posting is provided "as was" with no warranties, guarantees, lotteries, or any of those little bags of peanuts you get on planes. You assume all risk for crossing the street without holding mommy's hand. © 2001 Mike's Classy Software. Member FDIC. If rash develops, discontinue use.
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OpenGL Animation

30-Oct-01 8:51

My program uses OpenGL to animate in a window. But when that window is minimized the pictures still remain on screen and still animate. Does anyone know how to get rid of this problem.

Re: OpenGL Animation

Todd Smith30-Oct-01 8:57

Todd Smith

30-Oct-01 8:57

You need the CS_OWNDC flag when you create the opengl window.

Todd Smith

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