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Make sure the two files are matched as to their debug versus release builds.
You will get this very commonly if you built your DLL as DEBUG and your EXE as Release and then run them against each other.
The debug build's memory allocator will add extra memory checking data at head and tail of memory blocks, and the release build's memory allocator does not expect this extra data to be there.
Likewise, if memory is allocated by a release build and tested by a debug build, it fails because the memory block's header data appears to be corrupted.
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There is a critical service in my machine which crashes once in a month. I want to write an application which monitors that process and if that crashes sends email, or SMS or if possible restarts the service.
I am trying with Enumerating Process <process.h> . But that doesn't seem to be the solution.
thanx in advance
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Create a watchdog app. Find the handle to the process you need to monitor. Then go into a WaitForSingleObject state. Set a time limit and let the watchdog app time out and process messages occasionally in case you want to shut it down manually.
WaitForSingleObject returns a code that indicates the condition under which the function exits. If it timed out, the process is still running, so you clear the message queue and go back into WaitForSingleObject. If WaitForSingleObject exits because the process ended you send the e-mail, do whatever.
Robert
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Assuming the 'crash' means that the process being monitored has termianted. This will not detect if it has locked up or not - it is still 'running' but uselessly deadlocked or stuck in a loop.
If the monitored process is running as a service, you can periodically query the service control manager to get the service status, too.
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Hi,
I am creating an application, and I would like implement it as an out-of process automation server ( EXE ). I succeeded in doing that, But I have another requirement, which is to make the application singleton. That is, whenever the application is running, and if a request comes in to create an object of the application using say,
Set obj = CreateObject("xxx.yyy")
Then it should return the instance of the currently running application, instead of creating a new one. Could anyone pl. guide me in acheiving this.
Also, It would be really helpful, if you can give me the link to some sample pgms.
Thanks and Regards
Micheal
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I restarted the program I'm working on so it's built on MFC wizards now so new dialogs are easy to integrate into the project. Anywho, how I can disable a combo box? I created a control variable to the combo box but I don't see a function do disable it (and re-enable it later) in code, I only see the option in the Behavior section of the properties window if I select it in the dialog designer mode. I've been looking all around the help files and Google but nothing has surfaced or at least nothing that pops at me.
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EnableWindow()
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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Of course I missed that function, now I gotta figure out this data exchange...
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OK, I hope this is just a silly math error, but I'm stumped so far. I'm writing a little log viewer app, and I'm slurping the whole file into memory to parse it. If the user reloads the same file, I don't want to load the whole thing again, just the new data at the end of the file.
I calculate the offsets I'll be reading from/to and the size of the chunk I'll be reading, then pass all that to CreateFileMapping /MapViewOfFile . The problem comes when the file size is over 64K (which is SYSTEM_INFO::dwAllocationGranularity ), MapViewOfFile() fails with ERROR_ACCESS_DENIED .
DWORD dwMappingStartOffset = 0,
dwMappingEndOffset = 0,
dwStartingPosOffsetFromMappingStart = 0,
dwMappingSize = 0;
SYSTEM_INFO si = {0};
GetSystemInfo ( &si );
dwMappingStartOffset = m_dwLastSeenFileSize;
dwStartingPosOffsetFromMappingStart = dwMappingStartOffset % si.dwAllocationGranularity;
dwMappingStartOffset -= dwStartingPosOffsetFromMappingStart;
dwMappingEndOffset = dwFileSize - 1;
dwMappingSize = dwMappingEndOffset - dwMappingStartOffset + 1;
HANDLE hMapping = CreateFileMapping ( hFile, NULL, PAGE_READONLY, 0, dwMappingSize, NULL );
if ( NULL == hMapping )
{
CloseHandle ( hFile );
return false;
}
void* pvFileData = MapViewOfFile ( hMapping, FILE_MAP_READ, 0, dwMappingStartOffset, dwMappingSize );
if ( NULL == pvFileData )
{
CloseHandle ( hMapping );
CloseHandle ( hFile );
return false;
} The other odd thing is that if I change dwMappingSize to 0 on the CreateFileMapping() call - making the file mapping object the size of the whole file - it works fine. I could just do that, but this problem is bugging me, and I'll keep thinking about it until I solve it.
--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb
Strange things are afoot at the U+004B U+20DD
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Michael Dunn wrote:
The other odd thing is that if I change dwMappingSize to 0 on the CreateFileMapping() call - making the file mapping object the size of the whole file - it works fine.
From the docs for CreateFileMapping() - "After a file mapping object has been created, the size of the file must not exceed the size of the file mapping object". IMO, this suggests that the size passed to CreateFileMapping() has to be at least the size of the file, not the size of the mapped portion. It's kinda like saying that this parameter gives the size of the virtual address space used by the file mapper, regardless of how much is actually in use.
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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Ah but the rest of that sentence says: if it does, not all of the file's contents will be available for sharing. That's exactly what I want, I don't need a mapping on the entire file. Unless the file mapping is always created from offset 0, which seems to be the case here...
--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ | You Are Dumb
Strange things are afoot at the U+004B U+20DD
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Michael Dunn wrote:
Ah but the rest of that sentence says: if it does, not all of the file's contents will be available for sharing.
Yep. I read that as meaning that anything after the first <mapping size> bytes is not mappable (if that makes sense ). The way I interpret this size is that it's the maximum file offset that can be mapped by the file mapper, kind of like the address size of virtual memory. Remember old 16-bit machines? Even if you had 2MB of RAM you could only address 1MB of it with pure 16-bit addressing (segment + offset). From your observations, and what I interpret the docs as saying, it sounds like this is the situation.
Oh BTW, I always use the entire size of the file, because it doesn't actually make a difference to memory usage/performance - it's the size of the view that determines memory usage
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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i am a newb and i need an algorithm that can take a string of words and seperate them into seprate words.
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What are the words separated by?
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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While I'm sure you'd require something a little more sophisiticated, you could start with something as simple as:
char pSentence[] = "The time to repair the roof is when the sun is shining.",
*pWord;
pWord = strtok(pSentence, " ");
while (NULL != pWord)
{
cout << pWord << endl;
pWord = strtok(NULL, " ");
}
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
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hello guys,i need some help
i've project that need webcam as an input.
So, i try to find the class or SDK for my quickcam (logitech).
I got it, but i've problem.The SDK can't find the active x.
The Active X is VideoPortal.ocx
If someone has the file, can i get it?
Or if you know video portal api,coz i need it,
Or maybe,if someone know how to communicate with the cam using Visual C++,please help me
Ok,thats all,thanks for the help
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Hi,
if you go on the microsoft website and search for DirectX SDK and in this look for the StillCap project example. This should how to set up an interface into a webcam.
HTH
Andy
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I read MSDN about hooks, but I dont know how to write the filter function to take hot_key.
Ex: Ctrl + W --> Microsoft Word opens
Ctrl + P --> play CD player ...
Hope to recieve your guide !
Thank you
NewTan
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First of all, you'll have to make a dll to set a system-wide hook.
In this dll you'll have to register your keyboard hook procedure.
Your hook function will be called on every keypress the user makes, so at that point you check what key has been pressed and with the function 'GetAsyncKeyState' you can see wether ctrl, alt or one of the shift keys is down as well.
Next, you'll have to create an application which loads the dll and call a function in the dll to register the hook procedure (if not done by loading the dll).
If you want to keep things clean you should have a funtion in your dll to unhook your thing if you no longer need it, or close your app...
Don't think you are, know you are...
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Hi everyone!
Does anyone know how to make an application (e.g. Dialog based) ignore Windows key + M?
I think I've figured out that Windows uses MoveWindow to minimize the application window (it also seems that Windows moves the application window outside the screen), but no matter how I try to override WM_WINDOWPOSCHANGING, the application window vanishes.
Any clues and hints are appreciated!
Cheers!
/spacedoom
PS. I don't want to disable the Windows key by some registry hack.
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Hi guys,
i've been writing a simple app that draws a bitmap held in resource.
The idea Was to move a bitmap from x1 to x2 - simple animation.
I have never met such a problem with WM_PAINT / UpdateWindow,
the animation can be seen only when i drag another application over my form (it refreshes then) - it looks there is a problem with WM_PAINT in my app, can't get it working - any ideas?
Normally 99.9% of my apps (where some drawings are done) are refreshed using:
SendMessage(hWnd,WM_PAINT,0,0);
And after that call, everything is fine, but this time it doesn't work - any tip ?
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You should NEVER update your window using the above method... Instead use:
InvalidateRect(hWnd, NULL, TRUE);
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You should never send WM_PAINT message. This should be invoked by using Invalidate or InvalidateRect.
Use timer and make change of a drawing bitmap here. After that call Invalidate.
For example:
Bitmaps and index value are declared in header file:
CBitmap m_Bitmap[2];<br />
UINT m_uiIndx;<br />
In OnInitDialog bitmaps (array of 2) are loaded and timer set up.
BOOL CSomeDlg::OnInitDialog() <br />
{<br />
CDialog::OnInitDialog();<br />
<br />
m_Bitmap[0].LoadBitmap(IDB_BITMAP1);<br />
m_Bitmap[1].LoadBitmap(IDB_BITMAP2);<br />
<br />
SetTimer(23, 600, NULL);<br />
<br />
return TRUE;
}<br />
Timer sets index of a bitmap and calls Invalidate.
void CSomeDlg::OnTimer(UINT nIDEvent) <br />
{<br />
if(++m_uiIndx > 1)
{<br />
m_uiIndx = 0;<br />
}<br />
Invalidate();<br />
<br />
CDialog::OnTimer(nIDEvent);<br />
}<br />
In OnPaint proper bitmap is displayed
void CSomeDlg::OnPaint() <br />
{<br />
CPaintDC dc(this);
<br />
CDC memDC;<br />
memDC.CreateCompatibleDC(&dc);<br />
<br />
BITMAP bm;<br />
m_Bitmap[m_uiIndx].GetBitmap(&bm);<br />
<br />
CBitmap *pOld = memDC.SelectObject(&m_Bitmap[m_uiIndx]);<br />
dc.BitBlt(15, 15, bm.bmWidth, bm.bmHeight, &memDC, 0, 0, SRCCOPY);<br />
<br />
memDC.SelectObject(pOld);<br />
<br />
}<br />
JohnCz
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Big thanks for Your help guys.
InvalidateRect(hWnd, NULL, TRUE);
Did the thing.
Grtz.
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