|
Hi!
I'm trying to use two diferent CFont objects to use in diferente CStatics, but one of them is never used, why does this happends, i did like :
void CUnits_Sold::OnInitialUpdate()
{
CFormView::OnInitialUpdate();
//trata das fontes para os títulos
CFont hFont;
CFont hFontForm;
hFont.CreateFont(40, 15, 0, 0, FW_BOLD ,FALSE, FALSE, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, "MSTrebuchet");
m_stCStatic.SetFont(&hFont);
m_stCLabel.SetFont(&hFont);
m_stCMachineName.SetFont(&hFont);
m_stCTempo.SetFont(&hFont);
m_stCTempo2.SetFont(&hFont);
//cria a fonte para as letras de identificação do form
hFontForm.CreateFont(200, 14, 0, 0, 0 ,FALSE, FALSE, 0, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, "MSTrebuchet");
m_stCFormName.SetFont(&hFontForm);
}
This hfontform is not used and the m_stCFormName uses the hFont, what am I doing wrong?
Thank you for your time
Rui
|
|
|
|
|
As soon as the CFont objects go out of scope, they are destructed. The CFont destructor destroys the GDI font objects. Make the CFont variables members of the view class.
--Mike--
"Adventure. Excitement. A Jedi craves not these things."
-- Silent Bob
1ClickPicGrabber - Grab & organize pictures from your favorite web pages, with 1 click!
My really out-of-date homepage
Sonork-100.19012 Acid_Helm
|
|
|
|
|
Thank you Michael Dunn, it's working!
Rui
|
|
|
|
|
Hi all,
I am using the CHttpFile wrappers class in MFC. On one of my test networks I periodically see an issue where I send a POST command to a Java Servlet on my server, and my client times out waiting for a response (about 30 seconds). However if I type the same URL into IE I get the repsonse back ok. And if I reboot my machine the POST command starts working in my client.
My question is, does anyone know of an issue with the CHttpFile classes or Internet APIs with IE that would cause this, or possibly a mistake that I could have made in using them that would cause this?
Thanks
Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!
|
|
|
|
|
I don't exactly know the cause. But I suggest you to check the HTTP header and data that the client send to HTTP server.
You should make sure that your HTTP header is a correct POST header, and you POST data have the same length that you specify in POST header.
If you request is incorrect, the server will wait until it recieves the correct request. And that may be the cause that make your client doesn't recieved response from server.
And I additional suggest you that you should close the connection every time you connect to server.
|
|
|
|
|
Hi I developed an RAS software. When I run on Windows ME and later it works fine. I dont know about windows 98. But when I run it on Windows 95 it crashes when i try to delete RAS entry. Code is below. It works fine if i add one more line of MessageBox.
CRASHING CODE<br />
m_ras.DeleteRasEntry();<br />
<br />
The function looks like this.<br />
BOOL CMyRas::DeleteRasEntry()<br />
{<br />
DWORD dwResult=RasDeleteEntry(NULL,strBrand);<br />
if(dwResult!=0)<br />
return FALSE;<br />
return TRUE;<br />
}<br />
Not crashing one. This one doesnt crash else it crashes.
<br />
BOOL CMyRas::DeleteRasEntry()<br />
{<br />
DWORD dwResult=RasDeleteEntry(NULL,strBrand);<br />
TMessageBox("Out of entry");
if(dwResult!=0)<br />
return FALSE;<br />
return TRUE;<br />
}
One more thing. Program also crashes while trying to open a website by calling ShellExecute. It wasnt crashing earlier. But does now.
It doesnot crash if I call RasDeleteEntry as global.
m_ras.DeleteRasEntry();
RasDeleteEntry(NULL,m_ras.strBrand);
I have some global variables a total of going above 1.2KB . So I tried to convert one of 700 bytes to heap by calling GlobalAlloc but still it doesnt work at all. It crashes again and again.
help me plz.
THanks in advance.
In my dream, I was dorwning my §orrow§
But my §orrow§, they learned to §wim
|
|
|
|
|
<br />
struct InterfaceA<br />
{<br />
virtual void my_interface_func() = 0;<br />
};<br />
<br />
class Class : public InterfaceA<br />
{<br />
void my_interface_func() { }<br />
};<br />
AND
<br />
class InterfaceA<br />
{<br />
public:<br />
virtual void my_interface_func() = 0;<br />
};<br />
<br />
class Class : public InterfaceA<br />
{<br />
void my_interface_func() { }<br />
};<br />
Is there any advantage in using either and if so, what is it?
Thomas
My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers
modified 29-Aug-18 21:01pm.
|
|
|
|
|
a struct in C++ is a class with all member public by default.
a class in C++ is a struct with all member private( or protected, don't remember ) by default.
so, struct and class can be interchangeable! In your example, they are the same.
Max.
|
|
|
|
|
|
Thomas George wrote:
Why is it that interfaces are always structs then?
maybe because everything should be public by default.
Thomas George wrote:
Is there any performance advantage OR is it that people are lazy to write public: ?
I think the struct/class (the same for public/private/protected ) , is a compilation hint, it does not change the object ( in memory ), or the "performance" of an object.
Max.
|
|
|
|
|
Thomas George wrote:
Why is it that interfaces are always structs then?
Is there any performance advantage OR is it that people are lazy to write public: ?
I got intrigued by this because I always used class for creating interfaces and then I see the line #define interface struct in MSDN. I wondered why?
It is done so they can be used in regular C code, too.
I see dumb people
|
|
|
|
|
|
Hello,
I have an ActiveX Control which is embedded in another application which works fine.
The only problem is that
some peers want to test the control in the application before we ship the
product. From my point of view:
Automated Tests = COM, so I came up with the idea to make a second COM interface
and register it in the ROT (Running Obect table). This Interface gives
full access to my ActiveX control.
I have not done this before so I would like get some opinions how
this could be done in the best object oriented way.
Can I use the same .ODL file for my ActiveX project and insert
there the second interface ? What must I do to implement a second COM interface
by myself ?
Yours,
Alois Kraus
|
|
|
|
|
There are two basic ways to expose a secondary interface:
a) local classes (MFC does that, including some dirty tricks to make this effective)
b) multile inheritance (ATL does that)
b) is IMO much cleaner, only you can get into problems with method name clashes
Some pseudocode for the latter:
class CCoImpl : public IFun, public ITest
{
HRESULT QueryInterface()
{
if (iid == IUnknown) {
addref, return static_cast<IFun *>(this);
}
if (iid == IFun) {
addref, return static_cast<IFun *>(this);
}
if (iid == ITest) {
addref, return static_cast<ITest *>(this);
}
return E_NOINTERFACE;
}
HRESULT GoShopping() { ... }
HRESULT GoRocking() { ... }
HRESULT TestCountShoes(....) { ... }
};
you get the idea...
Neither way you can expose two dispatch (or dual) interfaces - you can only have obe dispatch-based interface per object.
If I could find a souvenir / just to prove the world was here [sighist]
|
|
|
|
|
How can I get the visible area of a window's CDC(In the paint function)?
I am trying to draw a grid, but drawing it on the whole thing would be wasteful(It's big!)
|
|
|
|
|
Huh ?
You normally draw in the client area of a window ( GetClientRect ), should be clipped, for additional clipping, look for them in the CDC help of MSDN.
Max.
|
|
|
|
|
Use the function ::GetRandomRgn with the SYSRGN flag. You may need to download the most current SDK headers in order to use this function.
I have written this article on clipping regions:
http://www.codeproject.com/gdi/cliprgnguide.asp[^]
It describes the system region, clipping region and meta region. It also has an example of how to get the imformation that you are asking for.
Good Luck
Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!
|
|
|
|
|
|
I'm trying to add the "Generic / Text Only" printer driver programmatically.
I've used AddPrinterDriver and AdPrinterDriverEx from the API but the driver doesn't work.
Did anybody solve this problem or have anybody some suggestions?
|
|
|
|
|
I've got a named pipe. One process writes to its (let's call it A) side, and the other process reads from its oposite (B) side. The process at the B side can randomly connect to and disconnect from the pipe. I'd like to prevent the A-side process from even trying to write to the pipe if the B-side process is disconnected. How can A-side process check the B-side pipe status? I have an idea of using PeekNamedPipe() with all its pointer parameters set to NULL and, when I get return value zero, interpret the result of GetLastError(), but this idea by no means seems that smart to me.
Any suggestions? Is GetNamedPipeHandleState() of any use in these situations?
TIA
Martin
|
|
|
|
|
I did use PeekNamedPipe for this purpose and it worked perfectly.
I use a one byte reciever buffer in the PeekNamedPipe function.
You could of course use WriteFileEx with an completion Routine and wait
for an error to occur.
A live ping always involves sending packets and check if the reciever responds
to it. There is simply no other way to check if somebody has unplugged Your network cable. PeekNamedPipe does exactly this in a transparent way without disturbing
your data transfer.
|
|
|
|
|
Thanks for your reply. Now I know I'm standing on the firm ground. Sometimes it's better to learn from others' successes instead of my own failures. 
Martin
|
|
|
|
|
hi, pretty new to .NET. But just want to make sure that i pick the right tool for a development project.
Project: coporate infrastructure - from scratch. Areas of concern involves: SQL Server 2000 dev/DMO, Active Directory, IIS (web server and FTP), security (Crypto), Exchange Server, Web application/service, WIN 2000 Adv Server.
Why Choose VC?
1. Backward compatibility
2. speed
but since:
1. this is a infrastructure project starting from scratch, we're not really concerned with "backward compatibility"? I presume there'd be no problem integrating COM components into VB.NET code.
2. speed. VB.NET is not any slower than VC.NET.
3. GUI. VB has a much better dialog editor than VC.
Just want to re-confirm my understanding. My preferred development tool for project like this will be VB.NET.
What do u think?
norm
|
|
|
|
|
I have absolutly no experience with VB or any of the technologies you are talking about! so take this with a brick of salt!
There's nothing wrong with either of them.
Use the language that you feel more confortable with! ( this is the most important point ! )
You can always create external DLL in C++ for more computational intensive stuff, or things that are easier made in C++ than in VB.
Some people will suggest using C#.
Max.
|
|
|
|
|
QUOTE: "You can always create external DLL in C++ for more computational intensive stuff,"
sure. but isnt it true that all .NET languages compiled to IL? speed is more or less the same among all .NET languages?
QUOTE 2: "or things that are easier made in C++ than in VB."
any examples?
norm
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
