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thanks
it's hard moving from managed back to unmanaged
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Yeah, I've moved from C# back to C++, and while I love it overall, there are definately things I notice are 'missing' ( although the same is true going the other way )
Christian Graus - Microsoft MVP - C++
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Why is it that even when my worker thread has already done its task, I still can't touch my GUI? Debug Assertion Failed message occurs when the program is about to do something like, EnableWindow(TRUE) and calling OnCancel() to close the dialog. Please Help 
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Can you show me some codes, so that i can identify the problem more clearly.
- NS -
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CWnd objects are not thread safe.
If your calling window related fucntions from a worker thread, you need to do them through the HWND parameter.
If you vote me down, my score will only get lower
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MFC has two kinds of threads, UI and non-UI (i.e. worker) threads.
Non-UI threads are not allowed to do UI-related things (although you can occasionally get away with it). You need to post a message from your worker thread to a UI thread and process it there.
The two most common elements in the universe are Hydrogen and stupidity. - Harlan Ellison
Awasu 2.1.2 [^]: A free RSS reader with support for Code Project.
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like said above,there are two thread types.....
well the goood news is there is a good documentation on both these types ny Joseph Newcomer!
just search for threading in the Codeproject itself!
cheerz....
"faith, hope, love remain, these three.....; but the greatest of these is love" -1 Corinthians 13:13
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Hello,
I have an app that for the most part runs in the background but occasionally needs to send pop up messages (simple dialog boxes) to the user (MessageBox dialogs are not an option). The default seems to be for these pop-ups to display themselves beneath all other open windows. This is not much good for 'notifications'.
First, how can one force MFC dialogs to pop-up/display on top of all others?
Second, how can one get these windows to stay on top regardless of which window recieves the input focus (the best example I can think of for this behavior is WinAmp with the 'Always on Top' option set)?
Thanks,
Grem
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Look into setWindowPos. Grab your window handle and use the TOPMOST const as defined in the API docs, I forget the actual const name... Good luck.
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Thanks Chris,
For anyone who is curious, setWindowPos() is the answer. The fn. call in my own code looks like this:
popup.SetWindowPos(
&CWnd::wndTopMost,
0,0,0,0,
SWP_NOSIZE|SWP_NOMOVE);
While digging around in the MSDN I cam across an alternative that can be used in a situation like mine where you want to create and display the window on top immediately; you can set the WS_EX_TOPMOST style for the dialog when you create it with CreateEx(...).
Grem
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I have a simple function that uses FindWindow() to find, and shut down, explorer.exe so that I can edit some system settings in the registry. It works really great, but it does not work on Windows XP 64. I also have a bunch of sleeps in the code that don't seem to be firing off. This has been thoroughly tested on every OS, it just doesn't work on XP 64. Here's the code:
//---------------------------------------------------------------------------// Description: This function simply shuts down Explorer.exe
//---------------------------------------------------------------------------
void CSystem::ShutDownExplorer()
{
HWND hwndShell = NULL;
hwndShell = FindWindow("Progman", NULL)
if(hwndShell != NULL)
{
if(!PostMessage(hwndShell, WM_QUIT, 0, 0L))
{
throw csErrorImplications;
}
else
{
throw csErrorImplications;
}
}
SleepEx(5000, FALSE);
}
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Since you have to close all instances of explorer.exe to be able to restore the taskbar you could scan for explorer.exe instances and terminate these processes.
Don't try it, just do it! 
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hi to all,
i finaly managed to get some free time and would like to create my first program using Visual Studio .NET. i would like a program with a nice menu, toolbar, dockable treeview on the left and other free space filled with richtextbox. it would be something like article writer, that's all. now i would like to find out few things, even though we're programming in vc++ .net on our faculty. anyhow, here they are:
1. when creating new .NET project, what type of project to select if i would like to write a program as mentioned above? should it be:
- Empty Project (.NET) or
- Windows Forms Application (.NET)
- MFC Application (MFC)
i noticed that that 2nd one has support for more Windows Forms components, also it has imagelist with selection about color depth etc. if i'm creating a program, it should also look good.
i noticed also, that in this example the best option is to use Windows Forms Applications.
What is your opinion? What are the actual diferences between those three?
2. but, if i'm talking about Windows Forms Application, i have a question about it,.. when viewing Class View for that type of project, i didn't noticed any main class. so, where to write my own code that would be executed when program would be runned? which is the main class when creating WFA?
3. the last question is somehow related with first two ones. i would really like to know, what type of project fits the best for a)dialog based applications (example- mIRC, UltraEdit, FTP programs, ... any kind of programs actually; if they're written in VC++ .NET)?
i would really apretiate your answers! thanks in advance and best regards to all
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lordgreg wrote:
- Empty Project (.NET) or
- Windows Forms Application (.NET)
- MFC Application (MFC)
Depends, do you want to use MFC or .NET ? Both of these options will work, albeit they are vastly different, because they use different libraries to achieve the same goal.
lordgreg wrote:
What is your opinion? What are the actual diferences between those three?
1 - creates an empty app that links to .NET
2 - creates an app that uses Windows Forms and therefore requires the .NET framework and knowledge of managed C++
3 - creates an app that either statically links to the MFC dll, or requires it to be installed. MFC is how C++ Windows apps were written before VS.NET, and still are, but it's the older option.
lordgreg wrote:
when viewing Class View for that type of project, i didn't noticed any main class. so, where to write my own code that would be executed when program would be runned?
I'm starting to wonder if you are really creating your first program at ALL, in which case, you're being way to ambitious. You shoud learn C++ before learning ANY windows library.
A forms app will have a form class which has events you can put code into. So will an MFC app, for that matter.
lordgreg wrote:
i would really like to know, what type of project fits the best for a)dialog based applications (example- mIRC, UltraEdit, FTP programs, ... any kind of programs actually; if they're written in VC++ .NET)?
The answer is option 2 or 3, depends on what library you want to use.
Christian Graus - Microsoft MVP - C++
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thank you for your answers Christian- they helped alot!
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I have a Canon USB camera, and when you plug it in, a dialog comes up and asks what app to launch to use the camera. I want to register my app for this event. Can anyone tell me how ?
Christian Graus - Microsoft MVP - C++
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Would you believe I already have those example projects on my hard drive ? I must have done some research before and forgotten about it. Thanks for putting me on the right track.
Christian Graus - Microsoft MVP - C++
-- modified at 18:12 Wednesday 21st September, 2005
Actually, unless I'm missing something, none of this helps. I don't want my app to realise that a device was plugged in, I want the dialog box that windows generates and asks me what app to launch to include my app, so you can plug in the camera, and Windows gives you the option to launch the app.
I found these two registry keys, which seem to contain the info I am after:
HKLM/SOFTWARE/SYSTEM/ControlSet1/Control/StillImage/Events/STIProxyEvent
HKLM/SOFTWARE/SYSTEM/ControlSet3/Control/StillImage/Events/STIProxyEvent
I'm still trying to work out how it all fits though, I suspect I need to use some of the code from that link to get a GUID associated with the device, and use that to write a registry entry. Perhaps.
-- modified at 19:36 Wednesday 21st September, 2005
Thanks for the help, I found that there's a COM DLL I needed to interop and call to register my app for still image events.
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Yeah, the issie is that you're leaking memory. Did you expect someone to look at the first few bytes and tell you waht the 38084 byte item is ? Surely you're not passing around enough 37k objects to not have an idea what it could be ?
Christian Graus - Microsoft MVP - C++
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! good thing there are smart people out there who answers question!
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You're welcome. Both of us who answered told you the same thing, so I'm not sure if you're trying to insult him, or insult me. Either way, the question was impossible to answer in any way beyond what we told you.
Christian Graus - Microsoft MVP - C++
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Memory leaks are not something that is easily solved. It requires a good eye and patience. Perhaps you should use this problem to train those skills? 
Good music: In my rosary[^]
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I just found out what was the problem. Thanks!
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