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Hi, all you happy coders
I Hope somebody can help me with this problem I am having:
In my program i try to allocate about 500KB (in smaller pieces) with the new operator,
but it hangs in some function called '__sbh_alloc_block'...
Is this because I can't get more memory from windows...?
Thanks in advance,
Erik Hammar
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Erik Hammar wrote:
i try to allocate about 500KB (in smaller pieces)
From that sentence I assume you have a loop of some kind where you repeatedly call new till you get 500 KB is several smaller blocks [or so we assume]
Now are you sure your loop is looping the right number of times. perhaps it's a sort of endless loop!
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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No it's not a loop...
I create instances of about 5 classes, which each allocate one or two blocks of memory...
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After how many sucessful 'new's do you get the error?
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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I get it after 5 times...
...
byte *bmpdata = new byte[256*240];
memsize 1 > 128KB
class1 = new CClass1(memsize1)
(inside CClass1's constructor)
data = new byte[memsize1]
memsize 2 > 128KB
class2 = new CClass2(memsize2)
(inside CClass2's constructor)
data = new byte[memsize2]
class3 = new CClass3 - this is where it crashes (before the actual constructor of CClass3)
...
Seems really strange to me, that this hangs the program, and not only gives me a NULL pointer!
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Well I cant even make any guesses from that.
But try creating the CClass3 object first and then create CClass1 and CClass2. Now if it still gives an error when you create the CClass3 the problem must be with something you are doing in the CClass3 constructor, but if the trouble happens with the third new then we are again nowhere 
Try this out anyway. And if possible post the CClass1/2/3 constructor code as well. Also how is the data member-variable defined in these classes?
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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Strange... moving the class3 creation code to the top, seems to eliminate the problem. That's strange, because the class3 doesn't even touch the class1 and class2
Anyway, Thanks for your concern!
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Erik,
I think you should not be complacent about the error being removed. We still don't know why it crashed before. A bug that has been hidden but not removed can be very deadly.
Good luck.
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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how can i make an instance of a CRecordSet class execute a more complex query (for example one with an inner select, as shown below)
e.g.
select name, street
from Customers
where name not in
(select name from Uninteresting_Customers
where ....)
the m_strFilter attribute off the CRecordSet class doesn't accept the more complex queries, quite obviously because it was only intended to contain the where-clause of the query....any help would be greatly appreciated...
bye
Jonas
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I think for this case you should use ADO API functions:
check these:
http://lnrpc2.irb.hr/ebooks/0672313502/ch04/ch04.htm
http://lnrpc2.irb.hr/ebooks/0672313502/ch06/ch06.htm
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Howdy,
I have a SDI CListView type app. I am using a WM_TIMER to try and update the list every second. The timer is working fine but the problem is that the list control doesn't update unless I click on one of the rows.. when I click on a row every row updates like it should, but when ever I want a update I have to click a row. Any ideas?
Rob
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If you click and it updates itself i would assume you could get away with calling the CListView's SetFocus in your WM_TIMER. Although this might cause flicker and wouldn't allow you select any other object so this is only a short term fix. Perhaps a call to it's OnPaint or Invalidate() would be more appropriate.
If someone explains precisely why, please let me know!
TIA
"An expert is someone who has made all the mistakes in thier field" - Niels Bohr
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Put an UpdateWindow after you update the list control. Though I am not sure you are doing the smart thing by calling a proc every 1 second using a timer.
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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UpdateWindow() ,SetRedraw(TRUE), Update(), UpdateData(FLASE) RedrawWindow(), UpdateItems(int start, int end).. None of these work..
Nish [BusterBoy] wrote:
Though I am not sure you are doing the smart thing by calling a proc every 1 second using a timer.
My OnTimer just sends a WM_COPYDATA to another application in return that application sends my console updated data and I update the list control if there are any changes to be made.. So really, it only updates every now and then.. I know its not working because I can make a change in the other app and its not reflected in my Console until I click on a item in the list..
Dumb question, I can populate the list and do all the redrawing through my CListView class right?
Im a little new with SDI and MDI apps..
Thanks,
Rob
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Dear all,
Is there any site available for All type of API functions,
and how can we know the recently developed API functions.
If any one knows please help me
Is there any Specific API is available to catch the recently added file in a Particular folder?
thank u.![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
anju
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http://msdn.microsoft.com
FindFirstChangeNotification for all OSes, or on NT you can use ReadDirectoryChangesW.
--Mike--
"COM didn't solve the old version of DLL hell - it just provided us with a new and improved version of hell."
-- John Simmons, 1/22/2002
My really out-of-date homepage
Sonork - 100.10414 AcidHelm
Big fan of Alyson Hannigan.
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If your looking for API reference try msdn. Or maybe look into VB API Reference
If your looking for all api's as in even third party api's
I dunno if any even exist
"An expert is someone who has made all the mistakes in thier field" - Niels Bohr
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Buy this book :-
Win32 API Bible by Richard J Simon
Nish
Sonork ID 100.9786 voidmain
www.busterboy.org
If you don't find me on CP, I'll be at Bob's HungOut
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I need to have a pen that draws one pixle on, then one off, then one on, and so on. There isnt one already a style like this. Is there a way to create a pen like this?
-Raffi
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PS_DOT would come pretty damn close no...?
If you need it exact you'll probably have to write your own.
You might wanna check out
Line Drawing explained
"An expert is someone who has made all the mistakes in thier field" - Niels Bohr
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Yuck, I hate using them. But what is a fellow to do? The CWinApp theApp object is a global. And so I have this static data member in one of my classes, and I want it to be destroyed last (or at least after the CWinApp object is destroyed). Is there is any way I can do this? Or any alternative to using that static data member, yuck...?
Thanks!
swinefeaster
Check out Aephid Photokeeper, the powerful digital
photo album solution at www.aephid.com.
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Create it with new in the CWinApp constructor and destroy it with delete in the CWinApp destructor.
"An expert is someone who has made all the mistakes in thier field" - Niels Bohr
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Nope that won't do. It's a multithreaded app, and I don't want to be accessing the CWinApp through another thread. But I've figured it out now, as someone mentioned on another thread that you can use #pragma init_seg(lib). Kind of a hack, but it'll do for now, until a better solution comes up.
Thanks though,
Swinefeaster
Check out Aephid Photokeeper, the powerful digital
photo album solution at www.aephid.com.
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I have external device. The device is connected with the computer through the serial-port. I send on the device number (signal), if it answers, the necessary procedure is started. I can use WaitCommEvent() for event (signal, EV_DSR), but if devise doesn't answer, WaitCommEvent will wait indefinitely, but i need to wait about 5 sec. I used WaitForSingleObject, but it doesn't work!
I don't know why. In what my error?
HANDLE port;
DWORD bc;
DCB dcb;
char buffer[100];
DWORD dwBlockSize=512;
void *szBuffer;
int numb=255;
BOOL fSuccess;
OVERLAPPED event;
DWORD dwEvtMask;
ZeroMemory(&dcb,sizeof(DCB));
strcpy(buffer,"baud=1200 parity=N data=8 stop=1");
BuildCommDCB((char*)&buffer,&dcb);
dcb.fRtsControl = RTS_CONTROL_ENABLE;
port=CreateFile("COM1",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL);
GetCommState(port,&dcb);
if(port==INVALID_HANDLE_VALUE)
{
CloseHandle(port);
}
SetCommState(port,&dcb);
HeapFree(GetProcessHeap(),0,&dcb);
szBuffer = malloc(dwBlockSize);
memset(szBuffer, numb, dwBlockSize);
WriteFile(port,szBuffer,sizeof(szBuffer),&bc,NULL);
free(szBuffer);
fSuccess = SetCommMask(port, EV_DSR);
event.hEvent = CreateEvent(NULL,FALSE,FALSE,NULL);
//Wait for signal
if (WaitForSingleObject(event.hEvent, 5000) == WAIT_OBJECT_0)
{
//procedure
}
else AfxMessageBox("There is no signal from the device");
CloseHandle(port);
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Two questions: Where is the event.hEvent signaled? Are you waiting for the event to become signaled or waiting for it to time out?
If I understand your question you need to test for WAIT_TIMEOUT not WAIT_OBJECT_0
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