Please help with memory leak - C / C++ / MFC Discussion Boards

Derek Lakin12-Sep-01 22:13

12-Sep-01 22:13

You need to override the DrawItem function to handle your own drawing.

There are many owner-drawn buttons that have bitmap support here already, e.g. CButtonSSL, which I wrote Wink | ;)

It would only take a few small changes to prevent the focus rectangle being drawn (just comment out the call to DrawFocusRect).

Derek Lakin.
Salamander Software Ltd.

Re: Focus Rect on a CButton

Remi Morin13-Sep-01 3:50

Remi Morin

13-Sep-01 3:50

Hi thanks for the tips but it's a big implementation for something so simple. I did'nt find what I'm searching for but I will. This is for a commercial application, in fact a application that we sold whit hardware, but this application will need modification/update very often, the reason why I'm doing it now (and i'm not using the old one) it's because modification/update are too hard. So I want to minimize the code. I'm doing a scroll bar derived from CWnd to get strange functionality, and I'm doing the little arrow at each end of my scroll bar. For these button, I don't want any Focus rect, everything else work already very well whitout so much code.

So I don't want add a big button class when CButton do already the job very well, except for that f*** focus rect.

Remi Morin
Rmorin@Operamail.com
Remi.Morin@Lyrtech.com

_T("")

RobJones12-Sep-01 9:52

RobJones

12-Sep-01 9:52

Dumb question from a beginer.. Whats the advantage of using this on your strings?

Rob Jones

Re: _T("")

C^hris L^osinger12-Sep-01 9:56

C^hris L^osinger

12-Sep-01 9:56

if you use this, when you switch from non-Unicode to Unicode builds, your string constants will convert accordingly.

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Appending integer values to a string? (for Tree labels)

12-Sep-01 9:12

I want to add items to a tree which have incremental numerical labels, how can I do this?

I want my items to consist of the CString "Section" + the short value generated by a FOR loop.
i.e. "Section 0"
"Section 1"
......
"Section 120"

Please help!

Pete T

Re: Appending integer values to a string? (for Tree labels)

C^hris L^osinger12-Sep-01 9:17

C^hris L^osinger

12-Sep-01 9:17

see one of the following:

CString::Format
sprintf
itoa

-c

------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com

Re: Appending integer values to a string? (for Tree labels)

Carlos Antollini12-Sep-01 10:31

Carlos Antollini

12-Sep-01 10:31

My money in CString::Format
Big Grin | :-D

Carlos Antollini.

Please help with memory leak

Craig Miller12-Sep-01 8:53

Craig Miller

12-Sep-01 8:53

Hi,

I'm currently using some code that I found in the forum to write a file to a database and it almost works. It appears that I have some memory leaks that I can't seem to find. Following is the code I'm using which is in a loop. I loop through a directory of images so I can load them into a database.

CFile tmpFile(fileName, CFile::modeRead);
				
//Read from bitmap file into buffer.
LONG nTotalBytes = tmpFile.GetLength();
				
//Allocate a buffer for the input and read from file.
BYTE * inputBuf = new BYTE[nTotalBytes];
UINT nBytesRead = tmpFile.Read(inputBuf, nTotalBytes);
				
CLongBinary cx_LongBinaryImage; 
cx_LongBinaryImage.m_dwDataLength = nTotalBytes; //set the cx_LongBinaryImage.m_hData = GlobalAlloc(GMEM_MOVEABLE,                   nTotalBytes); //allocates a HGLOBAL handle for the CLongBinary object.
				
BYTE* pITemp = (BYTE*) GlobalLock(cx_LongBinaryImage.m_hData); //pITemp is pointing at the address of the HGLOBAL handle
memcpy(pITemp, inputBuf, nTotalBytes); //copy the BYTE array containing the image to the HGLOBAL address
GlobalUnlock(cx_LongBinaryImage.m_hData); //unlock the memory
				
CImageRs* cxTableImage = new CImageRs(); //CRecordset object
if (cxTableImage->Open(NULL)) //opening the database
{
	cxTableImage->AddNew(); //create new record
	cxTableImage->m_MAKE = "Yamaha";
	cxTableImage->m_MODEL = "YZF600RK/RKC";
	cxTableImage->m_YEAR = 1998;
	cxTableImage->m_NAME = FindFileData.cFileName;
	cxTableImage->m_IMAGE.m_dwDataLength = cx_LongBinaryImage.m_dwDataLength;
	cxTableImage->m_IMAGE.m_hData = cx_LongBinaryImage.m_hData;
	cxTableImage->SetFieldNull(&cxTableImage->m_IMAGE, FALSE);
	cxTableImage->SetFieldDirty(&cxTableImage->m_IMAGE, TRUE);
	if(!cxTableImage->Update())
	{
		AfxMessageBox( "Record not added; no field values were set." );
	}
					
	cxTableImage->Close();
}

delete[] inputBuf;

If I call GlobalFree on cx_LongBinaryImage.m_hData I get an error because the CLongBinary calls GlobalFree in it's destructor. Also, when I run this code in the loop I get an error, "Could not update; currently locked by user 'admin' on machine 'MYMACHINE'." This happens when the loop is halfway through the directory, I'm not sure why this is happening. I'm currently developing on Win2000 with VC++ 6.0.

Thanks for any help you can provide,

Craig

Re: Please help with memory leak

Tim Deveaux12-Sep-01 9:26

Tim Deveaux

12-Sep-01 9:26

I don't see a delete of cxTableImage ?

Re: Please help with memory leak

Craig Miller12-Sep-01 10:30

Craig Miller

12-Sep-01 10:30

Tim,

Thanks for the reply, that's what it was. Sorry for the trouble on such a simple mistake.

Thanks again,

Craig

Re: Please help with memory leak

Tim Deveaux12-Sep-01 11:05

Tim Deveaux

12-Sep-01 11:05

Why is it always easier to see the other guys bug? Smile | :)

How can i register a .dll or .ocx file in my program similar register it using regsvr32.exe?

12-Sep-01 4:37

How can i register a .dll or .ocx file in my program similar register it using regsvr32.exe?
is using the DllRegisterServer() function,which dll file will i load when i use the function?

Re: How can i register a .dll or .ocx file in my program similar register it using regsvr32.exe?

12-Sep-01 4:41

You can find the answer somewhere in this forum.
There was some example-code in a thread in the last few days.

Search the Topics and Replies, then you'll find the code

regards

Re: How can i register a .dll or .ocx file in my program similar register it using regsvr32.exe?

Ben M. Stokland12-Sep-01 4:56

Ben M. Stokland

12-Sep-01 4:56

That might have been me.. Eek! | :eek:

http://www.codeproject.com/script/comments/forums.asp?forumid=1647&select=55401&tid=55395#xx55401xx
Big Grin | :-D

SHGetSpecialFolderLocation error !!!

Fredb4512-Sep-01 4:09

Fredb45

12-Sep-01 4:09

I want to retrieve icon like "my documents" in explorer but ...

My init function:

CShellUtil::CShellUtil()
{
SHFILEINFO shFinfo;
HIMAGELIST hImgList = NULL;
LPITEMIDLIST itemlist = 0;

bError=FALSE;
if (SHGetSpecialFolderLocation(0,
SIDL_DESKTOP , &itemlist) == NOERROR)
{
hImgList = (HIMAGELIST)SHGetFileInfo((LPCTSTR)
itemlist, 0, &shFinfo,
sizeof(shFinfo ),
SHGFI_SYSICONINDEX |
SHGFI_PIDL |
SHGFI_SMALLICON );

if(!hImgList)
{
bError=TRUE;
return;
}
m_SysImgList.m_hImageList=hImgList;
}
else
{
bError=TRUE;
return;
}

Function to display icon into Tree

HTREEITEM CShellUtil::AddSpecialItem(HTREEITEM hParent, int nFolder)
{
SHFILEINFO shFinfo;
int iIcon;
BOOL bIsCDROM=FALSE;
HTREEITEM hItem;
LPITEMIDLIST pIDL;
LPMALLOC pMem;

if(SHGetSpecialFolderLocation(NULL, nFolder, &pIDL) == NOERROR)
{
if(SHGetFileInfo((LPCTSTR)pIDL, 0, &shFinfo, sizeof(shFinfo),
SHGFI_DISPLAYNAME | SHGFI_PIDL |
SHGFI_ICON | SHGFI_SMALLICON))
{
if(SHGetMalloc(&pMem)==NOERROR)
{
pMem->Free(pIDL);
pMem->Release();
}
}
}

Icon = shFinfo.iIcon;
hItem=m_TreeCtrl.InsertItem(_T("Test"), iIcon, iIcon, hParent);

return hItem;
}

When i call 'AddSpecialItem', it's OK to insert special folder
from "CSIDL_DESKTOP" to "CSIDL_STARTMENU" and
from "CSIDL_DESKTOPDIRECTORY" to "CSIDL_LOCAL_APPDATA"-> DislplayName and Icon are OK

But there is a problem from "CSIDL_MYDOCUMENTS" to "CSIDL_MYVIDEO"
No icon and no display name and SHGetSpecialFolderLocation(..) return an error
I try with

if(SHGetFolderLocation(NULL, nFolder, NULL, 0, &pIDL) == S_OK)

but no success (return E_INVALIDARG)

I use lib from microsoft SDK august 2001 on win2000 Sp2 plateform with visual sp5

Please help

Write some short options into EXE

12-Sep-01 3:57

Hi
I want to write some short options directly into my executable. They should be appended at the end
of the exe (comparable to the ID3tag in MP3files).

I know how to open files in binary and write/read to/from them.

My question:

Is it possible to write the information into my executable while it is running?
Or do I need to temporarily create a copy, write it into this file and then delete original file?

thanks in advance

Re: Write some short options into EXE

Derek Waters12-Sep-01 14:03

Derek Waters

12-Sep-01 14:03

You want to write data directly into your executable?! Really? Since MP3 files are data files, it's up to the program that uses them to define where the data goes. But I don't think you can guarantee you'll know where your compiler will put its binary data without delving into the details of the PE format.

I would suggest you create a binary resource in your executable that just contains the options you need. You can then load the values using the standard LoadResource calls.

When you need to update the resource, you can use the BeginUpdateResource, UpdateResource and EndUpdateResource functions to do so, without having to worry about copying and deleting your executable.

------------------------
Derek Waters
derek@lj-oz.com

Re: Write some short options into EXE

12-Sep-01 18:05

I HAVE done this before, a long time ago and remember having no end of problems with it, although at this point I would have to dig out the program to say exactly what they were. At this point in time, I would say it's a probably a very bad idea, and almost certainly unnecessary. (When I did it I was writing for the DOS platform, and we didn't have binary resources.)

Quite frankly doing anything with a running executable anymore is just asking for trouble. I have yet to find a "nice" way to delete a running executable from within it, let along anything more complex (Yes, I've seen numerous solutions to this problem, but they all smack of "dirty hacks" to me."

Assuming you're programming for Windows, resources ARE probably your best bet.

As far as binary resources go, I use a CFile derived wrapper class which encapsulates the Win32 resource handling calls and makes the resource(s) look just like disk files. Mine came out of a commercial code library (Dundas Ultimate Toolbox) but Code Project or Code Guru might have something similar (it's worth a look).

Probably not much help, but there it is... Smile | :)

Gamaliel Masters
"If I were to disprove 'I think, therefor I am', would I cease to exist?"

How to access Access Base in VC++6.0

12-Sep-01 3:27

Hello,

Where can i find information in order to access data in an
*.mdb file using a console application under VC++6.0.
(I will need I/O access).

Thanks for help.

Re: How to access Access Base in VC++6.0

Martin Ziacek12-Sep-01 3:46

Martin Ziacek

12-Sep-01 3:46

Try this:

http://msdn.microsoft.com/library/en-us/daosdk/html/dadidx01_3inr.asp?frame=true

or

http://msdn.microsoft.com/library/en-us/daosdk/html/davcsdk_5jcf.asp?frame=true

Martin

Re: How to access Access Base in VC++6.0

Carlos Antollini12-Sep-01 3:49

Carlos Antollini

12-Sep-01 3:49

You have some options, that depends of wich technology you want to use.
For example you can use DAO, for that you have the CDAODatabase, CDAORecordset, etc, classes. You can use CDatabase Class usin ODBC, or you can use ADO, or OLE DB, for those you can find a lot of article in this site....

Good Luck!!! Smile | :)

Carlos Antollini.

unknow output debbug message

12-Sep-01 3:17

hello !
when i try to debug my application, the following message appear to the
output window :
`First-chance exception in Democreator.exe (GDI32.DLL): 0xC0000005: Access Violation`

What does it mean ?

Thanks.

F.Julien

Re: unknow output debbug message

Tomasz Sowinski12-Sep-01 3:26

Tomasz Sowinski

12-Sep-01 3:26

KB article Q105675 has some information.

Tomasz Sowinski -- http://www.shooltz.com

Re: unknow output debbug message

Carlos Antollini12-Sep-01 3:43

Carlos Antollini

12-Sep-01 3:43

From MSDN:

<br />
First and Second Chance Exception Handling <br />
<br />
Microsoft Win32 Application Programming Interface (API) included with: <br />
<br />
<br />
    - Microsoft Windows NT versions 3.1, 3.5, and 3.51<br />
    - Microsoft Windows 95 version 4.0<br />
<br />
<br />
Structured exception handling (SEH) takes a little getting used to, particularly when debugging. It is common practice to use SEH as a signaling mechanism. Some application programming interfaces (APIs) register an exception handler in anticipation of a failure condition that is expected to occur in a lower layer. When the exception occurs, the handler may correct or ignore the condition rather than allowing a failure to propagate up through intervening layers. This is very handy in complex environments such as networks where partial failures are expected and it is not desirable to fail an entire operation simply because one of several optional parts failed. In this case, the exception can be handled so that the application is not aware that an exception has occurred. <br />
<br />
However, if the application is being debugged, it is important to realize that the debugger will see all exceptions before the program does. This is the distinction between the first and second chance exception. The debugger gets the "first chance," hence the name. If the debugger continues the exception unhandled, the program will see the exception as usual. If the program does not handle the exception, the debugger will see it again (the "second chance"). In this latter case, the program normally would have crashed had the debugger not been present. <br />
<br />
If you do not want to see the first chance exception in the debugger, then disable the feature. Otherwise, during execution, when the debugger gets the first chance, continue the exception unhandled and allow the program to handle the exception as usual. Check the documentation for the debugger that you are using for descriptions of the commands to be used. <br />

Cheers!!!

Carlos Antollini.

Re: unknow output debbug message

Rashid Thadha12-Sep-01 5:36

Rashid Thadha

12-Sep-01 5:36

Its a M$ known problem, It only Occurs in Win95 or Win98 - Best thing is to ignore it, as long as its not crashing your APP

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.