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I have run into this problem quite a few times. And the reason i believe this happens is
IF the code that is being debugged by VC DOES NOT match what you have just built. Maybe the Visual studio picks the application from a different file location than where you are building your application project. The solution is to findout from where the debugger picks the application from And then to copy your new version(with your changes) to that location and start the debugger.
I Hope this helps.
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I experienced a problem similar to yours a couple times.
One time, I was calling DLL built using a release build.
Another time I overwrote memory with a bad pointer. I guess I was overwritting the code stack.
Please make sure your links and defintions in the project settings are OK. Also examine the stepped code in the debugger just before things go hay-wire
Hope this helps.
-Anil
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I have also seen this problem quite a bit. There are actually two separate issues, I think. One is the disabling of the breakpoint and then breaking at the app entry point; the other is the failure to execute new code. I say they're separate because I've seen each individually and cured them separately.
The solution for the first thing has always been to stop execution at the bogus break and go to the file where the breakpoint is now disabled. You'll see a hollow circle there. Position on the line and press F9, and the circle becomes filled again. Do I trust it? No, I hit F9 two more times to clear it and reset it again. I don't know if it's necessary, it's my voodoo and I just do it and it always works.
The second problem has happened to me many, many times in VC5 and VC6. The environment loses track of which files need compiling and linking and simply builds a mutant hybrid of the old and new code. You're &^$%@!* lucky when you see it in the debugger, otherwise it can show up as a bug in operation. One that doesn't make ANY sense unless you put it in this context. I have ALWAYS been able to fix this with a Rebuild All. ALWAYS. IMO, you can forget about incremental compilation and linking when it comes to your final release, end of story. I do a Rebuild All periodically. Not everyone has that luxury; but then, I don't know of anyone who has the luxury of putting out a program that crashes all the time, either.
Incidentally, something that will hose you in the same fashion is if the system clock gets set forward or back then forward while you are coding. Really confuses the IDE.
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Hmmmm...
I'm still stumped.
When I try to set a breakpoint or enable a breakpoint(hitting f9) the IDE tells me "cannot set breakpoint at cursor location".
I've done a Rebulid all many times now(this is no small project I'm working on so it takes quite a while) to no avail.
I also have removed all optimizations and other funky compiler options to try to fix the confusion....
I guess this is the part of the development process that they never tell you about...
Thanks anyways
Josh
josh@schroff.com
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Wow. I hope I don't get in your jam (probably will). I think I would consider creating a new project then copy the source and resources to it. A process fraught with danger, I know. You still have the old one, so it would at most be a waste of time. I can't imagine the problem would go with it, but you have to be really careful and thorough to make it work at all.
I've had the opportunity a couple of times to rip at the foundations of apps that have been out there awhile and I've done this; it just takes awhile. It takes more time if the original project hasn't been partitioned nicely, etc., but this makes a good opportunity to do just that.
If you find something that works, please let me know.
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1) do a manual clean, ie exit VC, delete .\Debug and .\Release dirs, *.aps *.clw *.ncb *.opt *.plg files (dont worry they will be regenerated)
2) *Maybe* also *.scc to drop your SourceSafe-links. I would do it. You can recreate them later.
3) Make sure all files and directories in question are writable/delete'able
4) Check the date/time of all files so that they aren't set to future dates/times
5) Be 100% sure that you know what file you are compiling. Search the disk so you haven't inadvertendly duplicate files on your disk and are compiling something else than you think.
6) Uncheck option 'project/settings/c++/customize/suppress startup banner'. Do same for Link tab.
7) Do a REUILD-ALL for both yor debug and release projects. Dependent projects first.
8) Check the output. Make sure all fles are compiled.
DO this and I guarantee that it will work. 100%. All the time. No magic. Promise. 
/Peter
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yah likewise
i usually delete the ncb file too and dont use hard breakpoints as it seems the actual address of the breakpoint gets remembered regardless of whether its on a line of code in the new build
tedious but again i seem to always be able to fix it with a full rebuild
good luck
frustating tho huh
mostly watching the human race is like watching dogs watch tv ... they see the pictures move but the meaning escapes them
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Hi Josh,
Sometimes the VC++ compiler buggers up the .PDB file. Depending of how observant
you are you might notice that it almost doubles in size. Additionally VC++
fails to fix this problem when you do a rebuild all! Isn't that annoying!
So you need to delete the .PDB and compile.
BTW: If you are writing a component that other are going to use (eg: dll) AND
you provide them with the binary, it is a good idea to also provide them
with the source code and the .PDB. This way they can step into your code!
Groovy hey.
It also encourages code reviews and shared testing.
Jules
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You win....Solution found!!!
I deleted the *.pdb file as suggested, rebuilt the project, and was finally able to step through my code correctly.
What a pain in the ass!!!!
But now I know, and knowing is half the battle!!!
Thanks
Josh
josh@schroff.com
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Cool! What exactly did I win again ?
:-j
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/*--------------------------------------------------------------*/
/*This function displays the captured bitmap in the window.It */
/*uses the palette of the captured bitmap so that colors are */
/*correct. */
/*--------------------------------------------------------------*/
void Paint(CDC* pDC,HPALETTE hPalette,HBITMAP hBitmap,LPRECT lpRect)
{
CDC * hDC;
CDC MemDC;
CPalette m_Palette;
CPalette * m_pPalette;
BITMAP bmInfo;
CBitmap m_Bitmap;
CBitmap *m_pBitmap;
hDC = pDC;
static int x=0;
//Get the BITMAP message of the hBitmap;
GetObject(hBitmap,sizeof(BITMAP),&bmInfo);
//Create the compatialbe bitmap for the m_Bitmap;
if(!m_Bitmap.CreateCompatibleBitmap(hDC,
(lpRect->right-lpRect->left),
(lpRect->bottom-lpRect->top)))
{
::MessageBox(NULL,"Error!","Error",MB_OK);
}
//Set the HBITMAP to the hBitmap;
if(m_Bitmap.FromHandle(hBitmap)==NULL)
{
::MessageBox(NULL,"Error--FromHandle!","Error",MB_OK);
};
if(MemDC.CreateCompatibleDC(hDC))
{
if(hPalette)
{
m_Palette.FromHandle(hPalette);
m_pPalette=(CPalette *)hDC->SelectPalette(&m_Palette,FALSE);
// RealizePalette(hDC);
}
m_pBitmap = (CBitmap *)MemDC.SelectObject(&m_Bitmap);
if(m_pBitmap==NULL)
{
::MessageBox(NULL,"Error--SelectObject!","Error",MB_OK);
}
int x=bmInfo.bmWidth;
int y=bmInfo.bmHeight;
//The flowing will occur a error.
//But i can't find out why.
if(!hDC->StretchBlt(lpRect->left,lpRect->top,
(lpRect->right-lpRect->left),
(lpRect->bottom-lpRect->top),
// &MemDC,0,0,x,
// y,SRCCOPY))
&MemDC,0,0,bmInfo.bmWidth,
bmInfo.bmHeight,SRCCOPY))
{
char tt[266],tmpstr[10];
char * p;
strcpy(tt,"Error--StretchBlt!");
p=_itoa(x,tmpstr,10);
strcat(tt,p);
::MessageBox(NULL,tt,"Error",MB_OK);
x=0;
}
else
{
x++;
}
// StretchBlt(hDC,ps.rcPaint.left,ps.rcPaint.top,
// (ps.rcPaint.right-ps.rcPaint.left),
// (ps.rcPaint.bottom-ps.rcPaint.top),
// hMemDC,0,0,bmInfo.bmWidth,
// bmInfo.bmHeight,SRCCOPY);
if(hPalette)
hDC->SelectPalette(m_pPalette,FALSE);
//Detect whether the CDC work.
// CBrush br(RGB(0,255,0));
// hDC->FillRect(lpRect,&br);
}
// EndPaint(hWnd,&ps);
}
This articles come from Code Project.
Thank you in advance!
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I'd love to help, but it would be a lot easier if you posted the error you are getting. The StretchBlt call looks perfectly legal to me, so I need to know what error you are getting to look further.
Christian
The content of this post is not necessarily the opinion of my yadda yadda yadda.
To understand recursion, we must first understand recursion.
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The flowing is my right code.
The cause of the error is that i call CreateCompatibleBitmap to create the compatible bitmap without the bmInfo.bmWidth and bmInfo.bmHeight.And there are other causes.
The right code is:
void Paint(CDC* pDC,HPALETTE hPalette,HBITMAP hBitmap,LPRECT lpRect)
{
CDC * hDC;
CDC MemDC;
CPalette m_Palette;
CPalette * m_pPalette;
CPalette * m_tmpPalette;
BITMAP bmInfo;
CBitmap m_Bitmap;
CBitmap *m_pBitmap;
CBitmap *m_tmpBitmap;
hDC = pDC;
static int xx=0;
//Get the BITMAP message of the hBitmap;
Sleep(1000);
GetObject(hBitmap,sizeof(BITMAP),&bmInfo);
//Create the compatialbe bitmap for the m_Bitmap;
if(!m_Bitmap.CreateCompatibleBitmap(hDC,
bmInfo.bmWidth,
bmInfo.bmHeight))
{
::MessageBox(NULL,"Error!","Error",MB_OK);
}
//Set the HBITMAP to the hBitmap;
if((m_tmpBitmap=m_Bitmap.FromHandle(hBitmap))==NULL)
{
::MessageBox(NULL,"Error--FromHandle!","Error",MB_OK);
};
if(MemDC.CreateCompatibleDC(hDC))
{
if(hPalette)
{
m_tmpPalette=m_Palette.FromHandle(hPalette);
m_pPalette=(CPalette *)hDC->SelectPalette(m_tmpPalette,FALSE);
}
m_pBitmap = (CBitmap *)MemDC.SelectObject(m_tmpBitmap);
if(m_pBitmap==NULL)
{
::MessageBox(NULL,"Error--SelectObject!","Error",MB_OK);
}
hDC->SetStretchBltMode(COLORONCOLOR);
if(!hDC->StretchBlt(lpRect->left,lpRect->top,
(lpRect->right-lpRect->left),
(lpRect->bottom-lpRect->top),
&MemDC,0,0,bmInfo.bmWidth,
bmInfo.bmHeight,SRCCOPY|DSTINVERT))
{
char tt[266],tmpstr[10];
char * p;
strcpy(tt,"Error--StretchBlt!");
p=_itoa(xx,tmpstr,10);
strcat(tt,p);
::MessageBox(NULL,tt,"Error",MB_OK);
xx=0;
}
else
{
xx++;
}
m_tmpBitmap->DeleteTempMap();
MemDC.SelectObject(m_pBitmap);
if(hPalette)
{
m_tmpPalette->DeleteTempMap;
hDC->SelectPalette(m_pPalette,FALSE);
}
}
}
This articles come from Code Project.
Thank you!
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I need I SuperGrid. What is this ? A Grid that I can put some ComboBox in the cells, or a checkBox and something like this.
Does anybody have this supergrid ?
Thanks 
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Have you looked at Chris's Grid?
http://www.codeproject.com/miscctrl/
http://www.codeproject.com/miscctrl/gridctrl.asp
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I have created an access db file using access and when I create an application with Class Wizard using DAO it reports that it doesn't recognize the file type. In ODBC it does however. The reason I wanted to use DAO is so that I can compact the database.
Any help would be appreciated, or how can I compact the database using ODBC.
Thanks in advance
Happy programming!!
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G'day Wolfram,
What version of Access did you use to create the database?
If you used Access 2000, you might try converting the database
to an Access 97 format and see if that works.
Tools->Database Utilities->Convert Database
I've also had similar problems on occasions using DAO to open
an Access database, and I've found repairing the database
normally helps.
Hope this helps,
Steve
--------------------------------------
Steve Driessens
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Sounds like a problem I had with 2000, there is a known issue.
Before you open the file add these two lines.
// These lines are required to access Access 2000 databases
AfxGetModuleState()->m_dwVersion = 0x0601;
AfxDaoInit();
If you search the MSDN site you will find the explaination.
http://support.microsoft.com/support/kb/articles/Q236/9/91.ASP
and
http://msdn.microsoft.com/library/periodic/period00/c++0100.htm
I added the above lines and it allows me to read both 97 and 2000 files.
I have not done much testing though.
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Hi,
My application while starting is placed in the systray as a icon. When i double click the icon, i get a Dialog. If i execute my application again, i get one more icon in the systray and similarly if i double click the icon twice two dialogs appear on the screen. I want to have only one icon on the systray and even if i click the icon again ( ie double click ) it should show only the previous dialog and not the new one.
ie I want to have only one instance of my application at any time.
Can anybody help me in doing this.
Thanks in advance
VMJ
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Hello,
In first line of InitInstance method of the Your application class, put the following code,
APP_NAME -- is the DialogWindow Title.
if(AfxGetMainWnd( )->FindWindow(NULL, APP_NAME))
{
AfxMessageBox("Application Already running");
exit(0);
}
If any suggesstions let me know.
Thanks ,
- Kannan.A.;)
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Hello, 
it works fine, but if you have open another window with the same name (e.g. explorer window or application with the same name) your application won't start.
Better way is to create some kernel object (MS suggest mutex) when your application starts and destroy at ending. Before creating you simply try to open such object and if succeded it means that your application is already running.
Regards
Bartek
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I've created a class that's not an MFC one, its a graph that need to be refreshed in a concrete time lapse.
I would like to use a timer in that class, but I don't know how to do it:
SetTimer(...) asks for a window parameter or for a pointer to a function... Here is where I don't know how to continue.<
Could you give me some advice or help?
a little example would be great.
Thank you in advance.
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If your graph class is derrived not from CWnd (thus not wrapping Windows window object - identified by HWND) you could call SetTimer(NULL, nIdEvent, uElapse, fnTimer), where fnTimer is a method from your graph class. What is important that you should declare this method as static (at compilation time you use its physical address - so compiler should know it ).
Regards
Bartek
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This still won't work if you don't have a window. Timers require a message pump and window to operate, even the callback method.
More likely, what he wants is a either a waitable timer, or simply to use the Sleep function to wait a specific amount of time.
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Yep - it's my fault ...
Hope Sleep() helps.
Regards
Bartek
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