|
Hi,
I am creating an MFC application which uses OpenGL. This is basically a 3D model editor. The OpenGL device is set up for Double Buffering. How can I draw with the Windows GDI onto a GDI context? The problem with doing something like the following is you get a nasty flicker because you are drawing on the screen after OpenGL has flipped the buffers.
SwapBuffers(dc.m_ps.hdc);
dc.Rectangle(32, 32, 128, 128);
If it is possible a way of solving this problem would be to draw with the GDI straight onto the back buffer of the OpenGL device so that when the buffers are swapped you do not get that nasty flicker. Because of the information and other GDI graphics which are required to be added onto the view, the constant flicker makes it very hard to work with the software.
I am not too fussy on how to solve this problem, so any fast and reliable methods would be great.
Any help would be greatly appreciated!
Regards,
Lea Hayes
Yours Sincerely,
Lea Hayes
|
|
|
|
|
Try this:
1) Create memory DC compatible with window DC and pass it to OpenGL:
CDC memDC = CreateCompatibleDC(&dc);
CBitmap memBitmap = CreateCompatibleBitmap(&dc, width, height);
memDC.SelectObject(&memBitmap);
SwapBuffers(memDC.m_hDC);
2) Draw in memory DC:
memDC.Rectangle(32, 32, 128, 128);
3) BitBlt from memory DC to window DC:
dc.BitBlt(&memDC, ...);
(Sorry if it will not work, I just guess..)
|
|
|
|
|
Is it possible to have an array with multiple columns (not sure if this is the correct terminology)? I have never used an array before.
kinda like a list control.
CString strIP, CString strDNS, CString strName, CString strStatus
64.64.64.64, test.dns.org, JoeSmoe, online
63.63.63.63, woot.dns.org, noname, offline
|
|
|
|
|
I just thought I would add I do have a structure for this information.. can I put the structure in the array?
|
|
|
|
|
Yes, you can. This solution seems just fine to me.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
Cool thanks.. I just implemented it and it works great.
|
|
|
|
|
I want to write a program similar to Windows Task Manager of Win2000. I've looked over the topic Process Status Helper[Win32] in MSDN but there's no function to retrieve the status of a process. How to know a process is running, blocked or ready? 
|
|
|
|
|
|
The demo app is really cool. Would you like to give me a portion of source code which access to the information of consuming CPU of each process? I'm so thankful to you if you send it to me by email. I need it for my school study. By anyway, thanks for your support.
|
|
|
|
|
Sorry, I overlooked that there is no source code 
Quoc Tran wrote:
Would you like to give me a portion of source code
It's not my article, try ask the author.
Pavel
Sonork 100.15206
|
|
|
|
|
newbie here, beware
in a properties page enviroment
i am trying to send a message from the main apps window to the view to update
a function
// the views messagemap
ON_COMMAND(ID_SAVEIT, OnSaveIT)
//
afx_msg void OnSaveIT();
//
void CBuilderView::OnSaveIT()
{
AfxMessageBox("Got a OnSaveIT in View");
}
// i set the m_Wnd int he main app
// on the views construct
// this is the call i am trying from the main app
void CBuilderApp::SaveIT()
{
::SendMessage(m_Wnd, ID_SAVEIT, 0, 0);
}
i don't get the MessageBox
any helps really appreciated
thanks
shotgun
|
|
|
|
|
shotgun wrote:
::SendMessage(m_Wnd, ID_SAVEIT, 0, 0);
::SendMessage(m_Wnd, WM_COMMAND,ID_SAVEIT, 0);
Pavel
Sonork 100.15206
|
|
|
|
|
you are a good person Pavel, thankyou
ps. i had to use HWND_BROADCAST, which means i better look into my pass of the hwnd, but thank you very much
shotgun
|
|
|
|
|
If you, like me think WM_COMMAND should be left to ui, then
ON_MESSAGE(UWM_SAVEIT,OnSaveIT)
is better.
make sure to use
#define UWM_SAVEIT (WM_USER + 1) // 1 -> any number
to avoid conflicts with the standard messages.
|
|
|
|
|
Hi,
I haven't got very much experience in writing multithreaded apps and would be glad if anyone could point out a good example. What I need to do is to create a worker thread (only one) that must be able to interact with the main GUI thread - i.e. it must send notifications to it when certain conditions are met in the worker thread. When the main thread receives these notifications it will update the UI. The main thread must then be able to cancel the execution of the worker thread and query it for its state at any time.
So has anyone got any experience in writing anything similar to this?
With best regards,
Daniel
Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!
|
|
|
|
|
Check out MFC sample MTRECALC.
|
|
|
|
|
Just beware thread programming is ALLWAYS harder than it seems. You must plan carefully what methods and members are to be shared by the threads.
Tip: to avoid having a gui-thread, use an event to signal thread termination.
in main thread loop, use
res = ::WaitForMultipleObjects(2,{hEventExitThread,otherEvent});
if(res == 0)
exitthread;
then use [main thread]
::SetEvent(hEventExitThread);
::WaitForSingleObject(hThread);
to make sure that the worker thread exits gracefully.
|
|
|
|
|
Dear Buddies,
I always wondering that:
1) If I want to hide the "help" button in "Customize Toolbar" dialogbox, I should response the TBN_INITCUSTOMIZE notification and return TBNRF_HIDEHELP.
However, TBNRF_HIDEHELP is never defined when compiled.
2) If I want to display a "Chevron" in a Rebar control, I should create the Rebar control with RBBS_USECHEVRON style.
Howerve, RBBS_USECHEVRON is never defined either.
Anything wrong? Is that because the version of SDK? Has the newest version SDK defined these two constans?
Thanks!
|
|
|
|
|
Hi,
a MFC DLL include ADO classes, and were loaded by MFC EXE. the debug result is following, how to fix this.
By the way, the MFC DLL has passed the compiling.
e:\hydro system\task history\night\hydrosrv\decode.h(14) : error C2504: 'CRecordset' : base class undefined
Thank u.
Extreme programming. Do the No.1
|
|
|
|
|
I call ::PeekMessage(...) to check if there's a message waiting. If there's message I call AfxGetApp()->PumpMessage() to process the message. I read that if PumpMessage() returns FALSE if a WM_QUIT message was processed and I check this return value to clean up my application. But if I close my application PumpMessage() seems not to return. Any advice?
|
|
|
|
|
why not just wait on WM_QUIT(or DESTROY) of ur mainframe? i can't think about ur case which let u use it.
if have to, create a thread while exit for cleanup.
includeh10
|
|
|
|
|
Has anyone got a code snippet for Terminating a process through using the C++ API into the WMI libraries.
I've been fumbling around, and cannot get it to ExecMethod. I've successfully created a process, and been able to query processes for a specific processid, but now I want to terminate it.
I can't find any examples in VC++.
This is kinda where I'm at.
If someone could please tell me what I'm doing wrong that'd be great.
m_pServer is connected, m_ProcessID is a valid ProcessID.
There are not a lot of examples of using WMI in VC++.
IWbemClassObject * pClass = NULL;
IWbemClassObject * pInArg = NULL;
IWbemClassObject * pInClass = NULL;
IWbemClassObject * pInMethod = NULL;
IWbemClassObject * pOutMethod = NULL;
BSTR ClassName = SysAllocString(L"Win32_Process");
BSTR MethodName = SysAllocString(L"Terminate");
BSTR ParameterName = SysAllocString(L"ProcessId");
LPCWSTR method = OLE2CW(MethodName);
VARIANT pcVal;
VariantInit(&pcVal);
V_I4(&pcVal) = m_ProcessID;
V_VT(&pcVal) = VT_I4;
hr = m_pServer->GetObject(ClassName,0, NULL, &pClass, NULL);
hr = pClass->GetMethod(method, 0, &pInMethod, &pOutMethod);
hr = pInMethod->SpawnInstance(0, &pInArg);
hr = pInArg->Put(OLE2CW(ParameterName) , 0, &pcVal, 0);
hr = m_pServer->ExecMethod(ClassName, MethodName, 0, NULL, pInArg, NULL, NULL);
|
|
|
|
|
Sorry, these two messages have been merged because of unknow reason. I don't know why...
My Programming Page
|
|
|
|
|
I am about to embark on a larger project and need to know , is there any pratical limits as to the amount of resources, memory limit or quantity, within an MFC project ?.
|
|
|
|
|
Is there any Limit for the Resources Actually..???
Mad Coding.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
