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An open moderated FAQ would probably help... Like interesting questions and good answers, modded by either the community or the mods. You're absolutely right though, I hate searching for the answer to a specific programming question, it's hard to narrow it down properly, and usually my terminology is wrong.
--
Peace,
Amit Jain
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Hi,,
each class can serialize its own data memebers, is that right?
ex:
Class myclass1
{
int x;
}
class myclass2
{
myclass1 item;
}
I like to know if myclass2 can serialize the data member (int x) of myclass1 ??
Thanks
Ehsan Behboudi
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You can serialize another class's data if:
a) if myclass1 has members that give access to its data
b) myclass2 is a friend of myclass1
c) if myclass1 declares its data a public (not a great solution)
-Ben
On the topic of code with no error handling -- It's not poor coding, it's "optimistic" 
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You should have a Serialize() function in myclass1, then myclass2.Serialize() can call item.Serialize().
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Dear all
how to set the IP address during programming ? Generally the IP address is set in the network neighborhood and then restart the PC . I want to set the IP address in my programm and don't restart the machine. Is it possible?
Thanks a lot
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You need to disconnect, then connect again. This is because the server need to evaluate if is valid your ip, and update your ip in the list. Is for this that is better to reboot the PC.
But you have a sample in win95 that permits to change the ip without reboot the PC, with the application winipcfg, with this app you can disconnect and connect again, get a new ip, without reboot.
Cheers!!!
Carlos Antollini.
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Hello, the codegurus around the world.;)
Your question seems to be tough.
Window 95, (98 & ME), NT, and 2000 has the differnt approaches to bind IP address to
NIC.
Windows 2000 has some API to change IP address, and the others seems not to have one.
Check MSDN help like the below.
Platform SDK: Internet Protocol Helper
IP Helper Functions
Rebooting the comp is very important to update the registry each other.
On NT, if we add NIC, and ipconfig command, we doesn't get the right info since
the registry entry mismatches.
Have a nice day!
-Masaaki Onishi-
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hi,
In Win2000 there is ipconfig, in Win98 there is winipcfg . They can refresh the IP address without reboot .I am wondering that they act as dhcp clients and after they send out a dhcp broadcast message ,then the ip address is changed by the dhcp server .
So I think there would be one method to change the IP address without rebooting . In MSDN the SDK of IP helper is useful for config the network, but the functions seems to only work in Win2000 .And I also can't assign a IP address which I want to assign using those functions.
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Hello, the codegurus around the world.;)
Well, I think that you are right as long as we set IP as DHCP checked in TCP/IP settings.
Because DHCP server assigns our client machine as the temporary IP address
on the view of the client and server.
However, on the other hand, we can assign the static IP address to our machine.
Actually, I use the static IP address for peer-to-peer network on my Windows 98s.
On this situation, I have to reboot my comp if I change my static IP address.
So, as long as we use DHCP support, and we know which IP address DHCP server has,
we can assign the dynamic IP address. However, if this IP address is assigned to
the other machine, the client and server will be screwed up?
We may need more to consider the code.
Have a nice day!
-Masaaki Onishi-
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Hello
I want to compare two structures to find out whether they are identical or not.
What is the easiest way to do that?
thanks
modified 12-Sep-18 21:01pm.
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Assuming you're using C, not C++...
If the structure doesn't contain pointers, you can use
if( memcmp( &struct1, &struct2, sizeof( mystruct_t ) ) )
{
// different
}
else
{
// identical
}
This is fast, but assumes that a byte-by-byte comparison is valid (e.g. that padding elements will always match).
If there are pointers, you may wish to check the data they point to, instead of the pointer values themselves.
If you have nested structures containing pointers, this can get quite messy.
In C++, each data type can check for identicallity itself, so there's no problem.
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What? In C++ each data type can check itself? Not true, not even close.
There's always the issue of a logical compare versus a bitwise compare.
Take something like
CString a = "Hi";
Cstring b = "Hi";
Depending on compiler settings (like string pooling) these may or may not point to physically different strings. In that case a bitwise compare would fail.
In C++ one way would be to have classes implement operator ==
But there are many different ways to approach this problem. It just depends on what you need.
--
Bryan
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" What? In C++ each data type can check itself? Not true, not even close."
"In C++ one way would be to have classes implement operator == "
Should have been clearer - the == operator is what I meant. Then recursed classes are not the problem they are in C.
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Ah, ok, my point back to gregor is that even if you implement operator ==, there is no magic, you still need to decide how your class is going to test for equality. And if your class has many memeber variables, you'll need to test all of them.
--
Bryan
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In my MFC dialog app I need tooltips for items in a CListCtrl. My implementation is similar to that in Matt Weagle's 'Using the List Control' tutorial. E.g. I'm handling the LVN_GETINFOTIP message with
void CMyDlg::OnInfoTip( NMHDR * pNMHDR, LRESULT * pResult )
{
NMLVGETINFOTIP * pInfoTip = reinterpret_cast<nmlvgetinfotip *=""> (pNMHDR) ;
_tcscpy( pInfoTip->pszText, _T("Some tooltip text") ) ;
}
The tooltips appear BEHIND the dialog box (so only the end of the tip shows past the end of the dialog)
Can anyone help?
Thanks
Monty
I'm using NT4.0, and VC6
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I had problem like this with treectrl in floating toolbar. You may try with this code - it makes tooltips the topmost window:
::SetWindowPos(
(HWND)m_yourListCtrl.SendMessage(LVM_GETTOOLTIPS),
HWND_TOPMOST,
0, 0, 0, 0,
SWP_NOMOVE | SWP_NOSIZE);
Note that you need to get listctrl tooltips using API - MFC doesn't have a wrapper for LVM_GETTOOLTIPS in VC6.
Tomasz Sowinski -- http://www.shooltz.com.pl
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Thanks for your suggestion Tomasz.
It does bring the tooltip to the front, but when I move the cursor over a new item (without clicking on it), the tooltip vanishes for about 1 second (and the dialog box title shows that it is no longer the active window), and then it reappears OK.
Any suggestions gratefully received...
Monty
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Adding the SWP_NOACTIVATE flag to the SetWindowPos call prevents this problem.
Thanks again for your help Tomasz.
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how can i fill the testprintpage in VC++ ?anybody knows pl.. let me know about it with code
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Hi,
I have created a class with CPropertyPage as its base.
I am then using the m_psp member to build a PROPSHEETPAGE structure which I pass to CreatePropertySheetPage function to create a property page I can add to a device's property pages.
The problem comes when in one of the routines for a button on my CPropertyPage I create an instance of a CDialog class I have and call DoModal()
The device manager crashes when this is run.
Any ideas why would be useful.
thanks
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Hello!
I'm trying to create a MFC dll that makes use of MS WebBrowser activeX
component. Another application loads the library runtime and calls certain
function that creates a dialog box with an explorer control. When creating
the dialog box, however, the initialization of browser control fails,
reporting
CoCreateInstance of OLE control {8856F961-340A-11D0-A96B-00C04FD705A2}
failed.
>>> Result code: 0x800401f0
>>> Is the control is properly registered?
Warning: CreateDlgControls failed during dialog init.
In the dll initialization, I call AfxEnableControlContainer().
If I build an EXE that creates a simple dialog with explorer control, it
runs just fine, but if I try to use it in a DLL, things don't work out.
Any ideas how to make it work?
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I'm not an MFC newbie and I'm still having the same exact problem with a different ActiveX control. I've been told that you also need to make a call to AfxOleInit() in the DLL initialization, but I've done that and it hasn't helped me a bit. Nobody so far has been able to help me solve this problem and it's really becoming frustrating. Let me know if you find a solution.
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Hi Everybody
I need to create a CListCtrl of which one of the subitem is more than 300 characters - I found that the CListctrl by default limits its subitem's max lengh to around 260 characters. Even though i see the value in the debugger - it's truncatd when i view it on the screen. Any code would be of much help.
Thanks in advance.
regards
Sankar
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I've seen the same problem and thought it was a bug in my code at first. It's pretty pathetic, really. 300 characters is not a sensible limit, if any limit is sensible in the first place.
Death to fixed-size buffers!
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I want to fax some documents through my project which was doveloped in Doc\View.My system dosen't supprt Windows2000.it should work on only NT.can anybody help me to code it?this is very urgent...
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