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You got a smile so bright,
You know you could have been a candle.
I'm holding you so tight,
You know you could have been a handle.
Smokey Robinson, "The Way You Do the Things You Do"
From the point of view of implementation, a handle under Windows is always realized in one of two categories:
1.An offset into a table that is being maintained by either the executive or a subsystem component.
2.A virtual address in the address space of a process.
It's not a bug, it's an undocumented feature.
suhredayan@omniquad.com
messenger :suhredayan@hotmail.com
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1.An instance handle is a pointer to the image of an executable file in a client process.
2.A resource handle as obtained by FindResource and LoadResource is a pointer to that process within the image.
3.A handle returned from VirtualAlloc or HeapCreate is a pointer to the beginning of the memory block in the client's address space.
4.A handle returned from HeapAlloc is a pointer into the chunk of memory allocated by 3.
5.A GDI handle is a relative offset into a table located in the client's address space.
6.A USER handle is a relative offset into a table located in the server's address space.
7.A handle to a native Windows NT object is a relative offset into a table located in system space. There are several of those tables—one per process and a few tables maintained by the system.
8.A USER object itself is located in the server's address space.
9.In the case of resources, 8 still holds true, but just as in 2, the resource is referenced through a memory-mapped image of the file that holds the executable, only the image resides in the server's address space this time. This is the scenario you encounter, for example, when calling LoadIcon.
10.The data structures that describe native Windows NT objects reside in system address space. Depending on the object type, part of the object may also be located in a process's address space. (This holds true, for example, for section objects.)
11.The data that describes a GDI object resides in the client's address space. Please also observe the restriction mentioned earlier in this article under "How the Subsystem Realizes Window GDI Objects."
It's not a bug, it's an undocumented feature.
suhredayan@omniquad.com
messenger :suhredayan@hotmail.com
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In other words, you can't meaningfully serialize a HANDLE, because when you read it back in (presumably in a different process) that HANDLE value won't be meaningful.
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Hi, I would like to know how I could programmatically change an image in a dialog.
For example, by clicking on a button, it would change IDC_IMAGE1 to IDC_IMAGE2 for example.
Code examples would be appreciated or reference to an article.
Thanks
Ashley
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http://www.codeproject.com/bitmap/
::DeleteObject(hbmButton))
hbmButton=::LoadBitmap(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDB_NEW_BITMAP));
if (hbmButton != NULL)
{
m_ButtonCtrl.SetBitmap(hbmButton);
}
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Hi, I have written a reminders program which allows the user to input something they need reminding about with a date time picker so they can select the date and the time in which the popup should come up....
I need to input into a string the current system time with the same formatting as the control so that the time and dates will match with the times and dates selected by the user. How do I get the System Time in the same format as the CDateTimePicker control?
Code examples would be appreciated or reference to an article.
Thankyou,
Ashley
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Have a look at COleDateTime::Format[^]
Michael
But you know when the truth is told,
That you can get what you want or you can just get old,
Your're going to kick off before you even get halfway through.
When will you realise... Vienna waits for you? - "The Stranger," Billy Joel
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CDTPicker m_DateStart; // in header
VARIANT tmpValue;
int year;
tmpValue = m_DateStart.GetYaer();
year = tmpValue.iVal;
------
SYSTEMTIME sysTime;
::SendMessage(m_DateStart.GetSafeHwnd(), MCM_GETCURSEL, 0, (LPARAM)&sysTime);
year = sysTime.wYear;
------ *****************************************
http://www.thecodeproject.com/statusbar/activexstatbar.asp
http://www.codeguru.com/Cpp/controls/controls/dateselectioncontrolsetc/article.php/c2229/
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Hi!
I'm building a application in VC++ .NET.
But when i run it it says to me that it's Out-Of-Memory.
The memory on the computer is not full...
How do you get rid of this problem?
Can you give the program more memory?
Regards, Koo
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Are you allocating a large amount of memory?
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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Is all the memory allocation on the Stack? Or are you allocating on the heap?
Ant.
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I don't know. It's windows that allocate the memory so i don't have a clue...
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If you have Windows 2000 or XP, look at the Performance tab of Task Manager to see the machine's memory usage. What does it look like before and during the program's execution?
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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Which makes no sense. Look at the Task Manager before your program runs, write down the memory-related numbers. Look at the Task Manager while your program runs, write down the memory-related numbers. Compare those numbers. What do they tell you?
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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That i've got plenty of memory left...
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Ok, can you post the exact verbiage of the out-of-memory message?
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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It comes in a messagebox:
Unhandled exception at 0x77e73887 in net32.exe: Microsoft C++ exception: CMemoryException @ 0x00f5f3a4.
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Sounds like you need to compile in debug mode, and use F5 to start the program.
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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What I meant was are you allocation memory to data statically or dynamically.
i.e.
char data[1000000];
or
char* pdata;
pdata = new char[1000000];
delete [] pdata;
If you are running through the debugger you should be able to see what it is that is failing to allocate. If you look at the call stack, what is being called?
Ant.
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It's a malloc call. Trying to allocate 22 bytes..
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If this is a C++ program use new/delete instead.
"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)
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When you look at the call stack is it calling the same function over and over again?
I.e. trying to allocate 22bytes over and over again?
Ant.
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You may have corrupted the heap.
Usually this is because you've written to an uninitialized pointer, or written before/beyong the end of an array or object that you've previously allocated on the heap.
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How may I change the default color in my CDialog with all my cildren-windows ( CButtons, CTabCtrl, … )
...and justice for all
APe
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