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in codeguru SDI Application with MDI Child Windows in Static Splitter Pane i don't have permission to access on this server.
The error is
First-chance exception at 0x00D91166 in MDIAppView.exe: 0xC0000005: Access violation reading location 0x00000020.
if i add
cs.hwndParent = pView->m_hWnd;
to CChildFrame::PreCreateWindow
this error while MFC window creation i think.
may be subclass the child window can resolve this problem but i dont know how to
subclass MDIChild with panel.
i know that WTL can place mdichild window in CSplitterWnd
The suppose is to create MFC mdichild window with CSplitterWnd as parent
in MFC program.
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Thanks for program.
I think it helps in solution.
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I'm working on an OpenGL application in C++. I have some code already written, but it's becoming a fairly complex project, and I want an easy way to scale it. I heard about MVC (I know I was exposed to MVC concepts when I learned OpenGL) and I read that graphics applications used MVC long before web. I don't know whether that was just the OpenGL part or if the whole application was being referred to. I'm thinking about the whole application, so I looked up MVC framework for C++ and found PureMVC, which looked pretty good, albeit with little to no tutorials and examples in C++.
So I'd like to know, is this a good idea?
More specifically:
1. would this cause the programme to take up extra system resources and cost FPS (or would it go faster),
2. is the PureMVC framework known to be stable or buggy (can I rely on it not to break my programme),
3. is it even good practice to use a second MVC in addition to the MVC used in OpenGL via GLM,
4. is PureMVC known to work on Ubuntu,
5. and if none of that is a problem, where can I find appropriate tutorials and examples to speed up the learning curve, preferably for MinGW/MSYS/Eclipse if they have compilation and linking instructions,
6. or is there something better than PureMVC I should use instead, which compiles on Windows and Ubuntu and is good for graphics applications?
Thanks.
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Need to cover some basics which you haven't mentioned which is always slightly scary
1.) I assume you are talking new OpenGL that is 3.0+ not old style OpenGL
Old style has the glBegin glEnd etc the new style you can't do anything without a shader and you drag all the function implementation pointers yourself.
2.) On the new OpenGL, GLM is one library you can use for matrix and maths stuff that ultimately ends up out on the shader in a sort of MVC setup.
3.) PureMVC is aimed at breaking the processing up via a predictable framework generally so you can thread it or use multicores.
I take it your current code is a linear application so not something you can port easily to PureMVC you need to design it differently from the start.
The next problem is PureMVC can be problematic in some situations like you have a client app interface sitting on a server which really has all the models. So the model view is handed to the client via the server. Lots of CAD programs and network games work that way and PureMVC is limited to what it can do. You can sort of shim it but you lose much of the effect and there are better techniques.
So can you start with a basic what OpenGL version and how your app is setup (models are where?) and when you say scale up what do you mean (more users, more processor cores)?
In vino veritas
modified 30-Jul-17 9:59am.
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Thanks for the advice.
When I was talking about scale, I was talking about my codebase. I was getting to the point where I had more than a few things working to together. I'm not confident in the way I'm organising it, and I'm having a little trouble even visualising how to put it all together efficiently and effectively.
I thought MVC might make all that go away. Something handling multiple cores for me would be plus, which I think PureMVC is supposed to do.
It sounds like PureMVC is a bad idea for a game though, I guess I'll do it the normal way.
Thanks.
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I will assume you are working with new OpenGL 3.3+ (If you aren't you need to switch now) you will have what amounts to a pile of Function pointers you will have got with wglGetProcAddress. Usually what you need to do is first start with that and put them in a class or object. Then build functionality on the class/object interface because you have everything contained. If you aren't comfortable with doing it yourself then use a library like GLEW which will wrangle all the function pointers for you. GLEW isn't great because you can't extend it easily but it's better than nothing.
If you haven't wrangled all the function pointers into a sort of API that is where you start.
Once you do that at a minimum you will be able to attach/change shaders and apply the matrixes to that class/object and it will store internally whatever it needs.
I usually set the class/object creation to take a window handle being the window you want to bind the OpenGL onto. The reason for doing that is when you run multiple windows each window will have it's own render context so you might as well bind the window into your object at construction. If you are using just one main OpenGL window the step will seem to have little benefit but the moment you start with multiple OpenGL windows you will get why you do it.
In vino veritas
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How is more efficient to have, a CMap member variable created on the stack, or on the heap, even the values of CMap are just pointers:
CMap<int, int, CStringArray*, CStringArray*&> m_MapContactInfo;
or
CMap<int, int, CStringArray*, CStringArray*&>* m_pMapContactInfo;
knowing that this CMap could contain thousands of elements ...
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Probably best on the heap if it contains large amounts of data. You also need to consider scope, i.e. how long will the object need to remain in memory?
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"how long will the object need to remain in memory?"
As long as object that contain m_pMapContactInfo are alive ... I mean:
CMyObject::CMyObject()
{
m_pMapContactInfo = new CMap<int, int, CStringArray*, CStringArray*&>;
}
and
CMyObject::~CMyObject()
{
if(NULL != m_pMapContactInfo)
delete m_pMapContactInfo;
}
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Flaviu2 wrote: As long as object that contain m_pMapContactInfo are alive
Only you know how long that will be.
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In fact, the m_pMapContactInfo are member variable into CView derived class ... so, as long the view are opened, the m_pMapContactInfo exist ... but what is matter how long the CMap object are exist ?
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It only matters in that you need to place the CMap object, and all its members, in the correct place to ensure it does not get destroyed at the wrong time. The fact that you posted this question suggests that you were not sure.
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CMap class creates its content data in the heap. It is by design.
So you can create your CMap instance on the stack and not worry!
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"CMap class creates its content data in the heap. It is by design."
This is a good news ! (I didn't read that by now) ... thank you.
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Hometurph Indi wrote: i am still not having a perfect solution with both options
Define perfect.
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Hello Guys
I am creating a direct3D surface for further creation of OffScreenplainSurface for video sample.
And This Code was working fine before Windows10 Update.
After Update, I found that IDirect3DSurface not returning the right D3DSURFACE_DESC.format which I am using to createOffScreenPlainSurface.
Here is the Code
CComPtr<IDirect3DSurface9> sampleSurface;
MFGetService(mediaBuffer, MR_BUFFER_SERVICE, __uuidof(IDirect3DSurface9), (void**)&sampleSurface);
D3DSURFACE_DESC surfaceDesc;
sampleSurface->GetDesc(&surfaceDesc);
CComPtr<IDirect3DSurface9> sharedSampleSurface;
HANDLE shareHandleSurface = 0;
device3D->CreateOffscreenPlainSurface(
surfaceDesc.Width,
surfaceDesc.Height,
surfaceDesc.Format,
D3DPOOL_DEFAULT,
&sharedSampleSurface,
&shareHandleSurface
);
Now, after windows10 Update surfaceDesc.format = 842094158 not the D3DFMT_YUY2
And I realized that sometimes after restart of Machine, it returns D3DFMT_YUY2 which looks like some services in windows10 update obstructing MFGetService.
I found one service sppsvc which automatic delayed start and Trigger start but I am not able to get much of it.
Any Help will be Appreciated.
Thank You.
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842094158 is 0x3231564E which is MAKEFOURCC('N', 'V', '1', '2').
So your mediaBuffer seems to contain frames in that format.
I don't know much about Direct3D but I guess that the format has changed with the video driver installed with Windows 10.
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Thanks Jochen for your Reply.
It makes a sense that As I read on many formuns that latest windows10 update had problem with Graphic drivers beacause it is not behaving correctly with the updates so some of them choose to roll back.
Again Thanks a Lot.
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Hello
Is that possible that I get different Format from particular one machine and unchanged hardware?
As after Windows 10 Update, sometimes I am getting NV12 surface format and sometimes YUY2.
Thank you.
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As I wrote, I don't know much about Direct3D. But there are some components like drivers and decoders involved which also have their own configuration.
A quick research shows that Windows is providing decompressed video streams in the YUY2 or NV12 format. So an application should probably support both formats.
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Thanks Jochen for your reply.
I also found that Windows Supports both formats YUY2 or NV12.
But, I am struggling why it is randomly showing either format which proves that there are some setting that needs to be set As I did not get any theory/description on getting random format from these two formats.
Thanks Again for your Reply.
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I have an ActiveX control (written originally in VC6, and later upgraded to VC 2010). When we first released it, I included a VB6 demo program to show how to use it. This all still works.
Recently, a customer requested sample code in VB 2017, and I have found that it crashes in this environment. I have also checked VB 2015 and VB 2010, and they also crash in the same place.
Here is a simplified overview of the ActiveX library:
library BoxWriter
{
interface ILine : IDispatch
{
[propget, id(8), helpstring("property m_lCount")] HRESULT m_lCount([out, retval] long *pVal);
};
interface IPrinter : IDispatch
{
[propget, id(1), helpstring("property m_line")] HRESULT m_line([optional, defaultvalue ("")] BSTR strLine, [out, retval] ILine* *pVal);
};
};
Here is a VB code snippet that causes the crash:
Dim printer As New BoxWriter.PRINTER
printer.Connect("192.168.1.3")
MsgBox(m_printer.m_line.m_lCount) ‘ <—crashes here
This is the error it gives:
An unhandled exception of type 'System.AccessViolationException' occurred in demo.exe
Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
The reference returned by CPrinter::get_m_line seems to be what it is complaining about. When I debug, I see the reference is set correctly by CPrinter::get_m_line, but after the function returns, something is calling the destructor for the CLine class.
STDMETHODIMP CPrinter::get_m_line(BSTR bstrLine, ILine **pVal)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState())
CString strLine = (LPCTSTR)_bstr_t (bstrLine);
CComObject <CLine>* pLine = GetLine (strLine);
if (!pLine) {
return E_INVALIDARG;
}
* pVal = pLine;
return S_OK;
}
I have tried creating a new ActiveX project in VC2010, and it also exhibits the same behavior. I tried returning the reference in several different ways (property vs method), and still have not been able to solve this. Surely I am not the first person to encounter this. Can anyone suggest how to fix this?
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At a guess your object is going out of scope and getting destroyed. You need to allocate a fixed block of memory (malloc or new) and copy the data to that block which you can then return. But that also means that the calling method will need to clean up after itself.
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I thought that was what CComObject::AddRef was supposed to do?
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