C / C++ / MFC Discussion Boards

29-Oct-01 13:19

Generally this problem comes up when you are trying to delete messed up memory in debug mode.

This means that you have created something with new (most probable an array) and have assigned values outside the bounds of that memory. When operator delete is called in debug mode it first checks to make sure the memory is intact (debug new adds a couple of padding bytes) by checking the boundary of the memory, if it is messed up it will throw an exception.

Environment Variables

Tom Wright29-Oct-01 11:28

Tom Wright

29-Oct-01 11:28

If I add an environment variable to NT thru the add environment variable dialog screen, it gets set when I hit the ok button. If I try and do it thru the registry programmically it does not get set right a way. After I do a RegSetValueEx is there something else I need to do to get windows to refresh the environment variables?

Thanks

Tom Wright
Programmer
tawright915@yahoo.com

Re: Environment Variables

Mike Nordell29-Oct-01 11:41

Mike Nordell

29-Oct-01 11:41

After I do a RegSetValueEx is there something else I need to do to get windows to refresh the environment variables?

Reload them (e.g. using a new process)? They are not connected to the CRT environment variables AFAIK.

/Mike

Re: Environment Variables

Tom Wright29-Oct-01 11:46

Tom Wright

29-Oct-01 11:46

For instance if I add a value to the end of the PATH variable thru the environment dialog it is set when I hit OK. If I add the value in my program to the end of the PATH variable then it's not set right away.
I've tried sendmessage to tell the system there's been a change but that doesn't seem to work either. Any suggestions

Thanks
Confused | :confused:

Tom Wright
Programmer
tawright915@yahoo.com

Re: Environment Variables

Joaquín M López Muñoz29-Oct-01 12:02

Joaquín M López Muñoz

29-Oct-01 12:02

RegFlushKey?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Xp program inVC++

29-Oct-01 10:57

Is it possible to compile programs in VC++ 6.0 to look like the new Windows XP programs?

THX

XP

Re: Xp program inVC++

Tomasz Sowinski29-Oct-01 11:06

Tomasz Sowinski

29-Oct-01 11:06

Check this:

http://msdn.microsoft.com/library/default.asp?URL=/library/techart/XPTheming.htm

And, at the very first page of msdn.microsoft.com you'll find the link to the page containing XP-related info.

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

Re: Xp program inVC++

Jim A. Johnson29-Oct-01 11:14

Jim A. Johnson

29-Oct-01 11:14

That was interesting, but a real sample would be better. They lost me when they mentioned the XP SDK Beta 2 - no beta SDKs allowed on our production machines here.

Is there a way to force a non-XP app to use the XP look, without including special headers?

Re: Xp program inVC++

Tomasz Sowinski29-Oct-01 11:32

Tomasz Sowinski

29-Oct-01 11:32

I haven't time to check this on VC6, but it seems that you only have to create a xml manifest, and add it to resources. The only thing from XP SDK is RT_MANIFEST #define.

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

Re: Xp program inVC++

Michael P Butler29-Oct-01 11:42

Michael P Butler

29-Oct-01 11:42

You need the latest SDK provided on the MSDN CD's or downloaded from the MSDN web site. The article is the best real world sample I've come across. Just cut and paste the xml manifest and rename to match your exe name. Add CREATEPROCESS_MANIFEST_RESOURCE_ID RT_MANIFEST "YourApp.exe.manifest" into your .rc2 file and compile.

>Is there a way to force a non-XP app to use the XP look, without including special headers?

Not that I'm aware of. You need to use the manifest file to tell XP to draw your application using the XP theme.

Michael Smile | :)

Re: Xp program inVC++

Anders Molin29-Oct-01 11:54

Anders Molin

29-Oct-01 11:54

You can take one of your old programs, and get it to use XP styles...

Make a textfile with the following text:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"> 
<assemblyIdentity version="1.0.0.0" processorArchitecture="X86" name="CompanyName.ProductName.YourApp" type="win32"/> 
<description>Your application description here.</description> 
<dependency> 
<dependentAssembly> 
<assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="X86" publicKeyToken="6595b64144ccf1df" language="*"/> 
</dependentAssembly> 
</dependency> 
</assembly><

If the program is calles test.exe, you call the textfile test.exe.manifest, and places it in the same folder as you application.

If you application don't use any ownerdraw stuff, it should now use the XP styles...

I actually tried it with VC 6.0, and almost all of the controls got XP styles. (the owner draw controls didn't)...

- Anders

Money talks, but all mine ever says is "Goodbye!"

Re: Xp program inVC++

Michael P Butler29-Oct-01 11:09

Michael P Butler

29-Oct-01 11:09

Yes, you need to create a manifest file. This article shows you how http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwxp/html/xptheming.asp

Michael Smile | :)

Combobox member variable messages? I can get ON_CBN_SELCHANGE but not ON_CBN_KILLFOCUS?

mhowes29-Oct-01 10:55

mhowes

29-Oct-01 10:55

I have two different situations where I have comboboxes that are part of a
view. I can't seem to get all the combobox messages.

A. I have a member variable that is part of a listview class. I make a
handler for ON_CBN_SELCHANGE and I get that just fine, but I make a handler
for ON_CBN_KILLFOCUS and I don't get that message??? I can get a
ON_EN_KILLFOCUS for a CEdit member of the same view. Is there something
special about ON_CBN_KILLFOCUS?

B. I have, also in this view, a combobox, added to a toolbar. Both are
members of the view. I do all the positioning myself.
The toolbar's parent is the listview (this) and the comboboxes parent is the
toolbar (m_tbrColumns). How can I get the messages for the combobox in the
view?? I don't get any messages for this combobox in the view.

thanks
mike

Re: Combobox member variable messages? I can get ON_CBN_SELCHANGE but not ON_CBN_KILLFOCUS?

Tomasz Sowinski29-Oct-01 11:20

Tomasz Sowinski

29-Oct-01 11:20

Answer to (b):

If you want MFC message maps to work, you'll have to override toolbar's OnCmdMsg. You should call the view's OnCmdMsg first:

BOOL CYourToolbar::OnCmdMsg(...)
{
if (m_pParent->OnCmdMsg(...))
{
return TRUE;
}

return CToolBar::OnCmdMsg(...);
}

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

how can i fill a CComboBox faster?

29-Oct-01 10:51

Hi all

I want to know if there is a faster way to fill a CComboBox with a large number of elements(8000-12000) Confused | :confused:

Re: how can i fill a CComboBox faster?

Tomasz Sowinski29-Oct-01 11:02

Tomasz Sowinski

29-Oct-01 11:02

Here are some tricks:

1) call CComboBox::InitStorage before adding the items. This will reduce the number of memory reallocations during the sequence of AddStrings.

2) You can try to use CComboBoxEx instead and use 'callback items'. In this case you do not pass the string to the combo - instead, the combo will ask your app (using WM_NOTIFY) each time it needs a string. This will work when you have the strings stored somewhere else - in the dynamically allocated array filled with data loaded from database, for example.

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

Re: how can i fill a CComboBox faster?(for Tomasz Sowinski )

29-Oct-01 21:58

Can you give source code for the second way.I'm loading items from a database

Re: how can i fill a CComboBox faster?

Mike Nordell29-Oct-01 11:09

Mike Nordell

29-Oct-01 11:09

Disable redraw during update. Short of that, no. Though I fail to see why you'd like 8k-12k entries in a freakin' combobox. Perhaps something else in the interface could be fixed?

Toobar Question

Steve L.29-Oct-01 10:50

Steve L.

29-Oct-01 10:50

Im trying to get a small bitmap I have to appear on my toolbar, not to be pushed like a button or anything, just a picture. I have created a "dummy" button on my toolbar and called it ID_STATIC_DUMMY. This is the code I have:

CToolBar m_wndToolBar;
CStatic m_static;
CRect rect;

int nIndex = m_wndToolBar.GetToolBarCtrl().CommandToIndex(ID_STATIC_DUMMY);
	m_wndToolBar.SetButtonInfo(nIndex, ID_STATIC_DUMMY, TBBS_SEPARATOR, 25);
	m_wndToolBar.GetToolBarCtrl().GetItemRect(nIndex, &rect);

if(!m_static.Create(NULL,WS_DLGFRAME | SS_CENTERIMAGE | SS_BITMAP | WS_VISIBLE, rect, 
	&m_wndToolBar, ID_STATIC_DUMMY))
{
	TRACE(_T("Failed to create static\n"));
	return FALSE;
}

CBitmap myBitmap;
myBitmap.LoadBitmap(IDB_BITMAP_STAR);
m_static.SetBitmap(myBitmap);

It works correctly except that it doesnt display the correct bitmap. I cant even make out what it puts there but it does put something there. Whats the problem???

<marquee>Raffi

Re: Toobar Question

Tomasz Sowinski29-Oct-01 12:16

Tomasz Sowinski

29-Oct-01 12:16

It seems that your bitmap gets destroyed when myBitmap goes out of scope. Make it a member or call myBitmap.Detach().

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

Re: Toobar Question

Steve L.29-Oct-01 15:04

Steve L.

29-Oct-01 15:04

It worked. Thank you very much Smile | :)

<marquee>Raffi

Re: Toobar Question

marcela30-Apr-02 14:37

marcela

30-Apr-02 14:37

this is a really old answer to a really old question ; but I had the same problem and this recomendation solved it for me too!

so thanks! Big Grin | :-D

marcela bovio

Parsing a string that contains only one seperator

Kuniva29-Oct-01 10:46

Kuniva

29-Oct-01 10:46

I have a CString. It contains multiple #'s that break it up. Now i want to get each piece of text seperately between the #'s. For example:

Jake#Caroline#Mark#Anthony#Sid#

The string ends with # but doesn't start with # (although you can presume otherwise because it can be changed).
Hows the easy way to do this? (preferably the MFC CString way Wink | ;)

)

Thanks

P.S.: i'll stop hasssling u ppl now lolz, i'm working on a program thats why i was asking so many questions hehe.

Kuniva

Re: Parsing a string that contains only one seperator

Christian Graus29-Oct-01 11:03

Christian Graus

29-Oct-01 11:03

The C way would be with strtok, but otherwise, you'd use CString::Find, which allows you to find the first instance of a substring starting from a specified position, and CString::Mid which allows you to pull a substring out of the middle.

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: Parsing a string that contains only one seperator

David Scambler29-Oct-01 11:03

David Scambler

29-Oct-01 11:03

try this:

CString text = "Jake#Caroline#Mark#Anthony#Sid#";
CString name;
int index=0;
while (AfxExtractSubString(name, text, index++, '#') {
if (name != "") {
// do something
}
}

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