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HWND FindWindow(LPCTSTR lpszClassName, LPCTSTR lpszWindowName)
I know I can use NULL as the first parameter but just curious, given all source code of a project, how do you know the "class name" of a CWnd? Also, is there any way to change the "class name"? Thank you.
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That depends. For instance, controls usually have very specific window classes, for instance buttons are "BUTTON", so if you want to find all the edit controls with a specific bit of text, you use FindWindow("EDIT", "TEXT").
For more generic windows, and MFC, you can use Spy++ to find the window class if you like.
--
Where are we going? And why am I in this handbasket?
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Bin wrote:
how do you know the "class name" of a CWnd?
The easiest way is by spying on the window (Spy++).
Bin wrote:
is there any way to change the "class name"?
The framework assigns a default class name to CWnd-derived objects. I believe the easiest way to change it is by overriding the PreCreateWindow method.
Regards,
Alvaro
All you need in this life is ignorance and confidence, and then success is sure. -- Mark Twain
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I tried to override CMainFrm's PreCreateWindow method and set "cs.lpszClass = _T("my test window");" but then got "Failed to create empty document" error message. What else has to be done? Thank you.
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I think it's important to register your own window class before assigning it's name to lpszclass. Thus first call RegisterClassEx, providing a WNDCLASSEX structure containing your class name. The most values of WNDCLASS struct can be filled by calling GetClassInfo.
WNDCLASS wndcls;
memset(&wndcls, 0, sizeof(WNDCLASS));
::GetClassInfo(AfxGetInstanceHandle(),"AfxFrameOrView",&wndcls);
wndcls.lpszClassName = "MyNewClass";
::RegisterClass(&wndcls);
After that steps your class name is made known by the system and can be used.
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In my application, i have a sub frame window derived from CMDIFrameWnd that is NOT the main frame of the application. I need to be able to add Child frames from a specific document template to this frame. Any ideas on how i might go about doing that?
He's fetching hot.
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hi all,
does anybody know how a CImage bitmap can be outputted to a dialog window? I want to use CImage because i have direct access to setpixel commands.
thanks,
Paul.
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What is CImage ? Is that the Image class in GDI+ ? Just create a Graphics object to contain the dialogs HDC and draw the image onto it.
Christian
No offense, but I don't really want to encourage the creation of another VB developer.
- Larry Antram 22 Oct 2002
C# will attract all comers, where VB is for IT Journalists and managers - Michael
P Butler 05-12-2002
It'd probably be fairly easy to make a bot that'd post random stupid VB questions, and nobody would probably ever notice - benjymous - 21-Jan-2003
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hi,
by default using a tree control, if i don't declare on_wm_keydown() in my message map, the treectrl uses its own predefinied actions for the keydown operatiosn.. is it possible to use the predefined keydown operation with the ones that i implemented myself at the same time? ie, if keydown message is vk_up and vk_down, i want to use the default treectrl operation(moving the focus of a node in the tree up and down). if keydown message is vk_insert, i want to use my own function.. is it possible? thanx in advance..
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Yes! Simply check for VK_INSERT. If it happens, do your stuff; otherwise, call the base class's OnKeyDown.
Regards,
Alvaro
All you need in this life is ignorance and confidence, and then success is sure. -- Mark Twain
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I have a database where one of the columns is a DECIMAL type. Are there any functions in the C runtime library or Windows API for working with this type directly?
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AFAIK it's just a float
- Anders
Money talks, but all mine ever says is "Goodbye!"
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Anders Molin wrote:
AFAIK it's just a float
or even better: double
If you need to extract it from a string, just do:
double MyData = atof(szMyTextData);
- Nitron
"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb
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I feel kinda stupid asking this... but when I try creating my edit box I can't get it to look 3D!!! 
The font that the edit box has is damn ugly too! 
How to get away from these things!?
I never had these problems when I did the same on VC++ 6! Now I'm using Vc++ 7
Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!
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Set the font to the parent's font.
pYourEdit->SetFont(pYourEdit->GetParent()->GetFont());
or just simply:
pYourEdit->SetFont(GetFont());
, if you are doing it from the code of parent's window.
Zolee
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Sorry I didn't tell you that I don't use MFC!
I create my edit box like this:
wndCmdEdit = CreateWindow("edit",
NULL,
WS_CHILD | WS_VISIBLE |
WS_BORDER | ES_LEFT | ES_MULTILINE,
5, 130,
385, 20,
hWnd,
(HMENU)IDC_MAINWNDEDIT,
hInst,
NULL);
Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!
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For 3D look, use the CreateWindowEx() function with the WS_EX_CLIENTEDGE extended window style. Then use SendMessage() to send a WM_SETFONT message to the edit control to set it's font.
CPUA 0x5041
Sonork 100.11743 Chicken Little
"So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies
Within you lies the power for good - Use it!
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Hi,
I'm trying to write a simple UDP client application which receives UDP
packets from a server, each the size of 384 bytes. Unfortunately, I'm
encountring what seems to be client-side packet loss, which gets only worse
when multiple threads are added to the application. This is not a result of
high CPU usage, since the CPU usage is only a few percent. I can only assume
that the packet loss is a result of context switching done by the OS, and my
application not being able to receive the packets on time.
I'm using VC++ on win2k, and the winsock2 functions in the platform SDK to
create a socket and receive UDP packets from a specified port. I've tried
setting the process & thread to time critical, which does have an
improvement, but the packet loss continues.
Is there any way to avoid client-side UDP packet loss ??
Ideas / code examples would be greatly appreciated !
Danny
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You probably don't want this answer but...
Yes, it's called TCP.
Before flaming me consider the U in UDP. It's there for a reason.
If you can't deal with lost packets (by means of reckoning, ignoring, application-initiated retransmissions and so on) go ahead and use TCP.
Ofcourse you can try to minimize lost packets but since you never can be sure you got em all, why bother?
Just my 2cents...
"Well I'm just a hard working corporate slave, my mind should hate what my body does crave.
Well I'm just a humble corporate slave, driving myself into a corporate grave"
Corporate Slave, SNOG
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Before flaming me consider the U in UDP. It's there for a reason,
U stands for "user", I don't see how this is relevant 
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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It's the answer to the question:
Who will implement everything lacking to make this really usefull?
"Well I'm just a hard working corporate slave, my mind should hate what my body does crave.
Well I'm just a humble corporate slave, driving myself into a corporate grave"
Corporate Slave, SNOG
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UDP is connectionless, so it's always possible you will lose packets. Try to use TCP sockets, or build some kind of protocol (using UDP) to avoid packet loss. You can play with the network card driver buffer settings, or using bigger packet size, or decrease the frequency. And if you are not using a real-time OS, you cannot be sure the OS will store all the incoming packets.
Zolee
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UDP is connectionless, so it's always possible you will lose packets. Try to use TCP sockets, or build some kind of protocol (using UDP) to avoid packet loss. You can play with the network card driver buffer settings, or using bigger packet size, or decrease the frequency.
If you are not using a real-time OS, you cannot be sure the OS will store all the incoming packets. Like a driver will run on higher priority than your process, and it's possible you'll lose packets.
Zolee
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Note that if sending a UDP messages from several threads and before ARP resolution is done (because ARP entry has expired or is the first message sent), it will cause some (or all?) UDP messages to be lost.
This is (according to MSDN) due to the fact that there can only one pending ARP-reply per host-IP. Sorry I cannot find the ref. at the moment.
Remedy: call SendARP() before sendto().
Gisle V.
"If you feel paranoid it doesn't mean they're not after you!" -- Woody Allen
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I've created an Edit box like this:
wndCmdEdit = CreateWindow("edit",
NULL,
WS_CHILD | WS_VISIBLE |
WS_BORDER | ES_LEFT | ES_MULTILINE,
5, 130,
385, 20,
hWnd,
(HMENU)IDC_MAINWNDEDIT,
hInst,
NULL);
But when I write text to it with "new line" char it adds a | instead of new line!!
Why??
Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!
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