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DaveE9th wrote:
I also see that my classes did not open with the workspace when I reopened the program (I think this is my problem), problem is I'm not sure how to open them (shouldn't they open with the workspace?).
Delete the clw file and ncb files.
John
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DaveE9th wrote:
Linking...
Exodus.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CExodusDoc::classCExodusDoc" (?classCExodusDoc@CExodusDoc@@2UCRuntimeClass@@B)
Exodus.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CMainFrame::classCMainFrame" (?classCMainFrame@CMainFrame@@2UCRuntimeClass@@B)
Exodus.obj : error LNK2001: unresolved external symbol "public: static struct CRuntimeClass const CExodusView::classCExodusView" (?classCExodusView@CExodusView@@2UCRuntimeClass@@B)
Debug/Exodus.exe : fatal error LNK1120: 3 unresolved externals
Error executing link.exe.
The three errors are because you don't have the macros for dynamic class creation in your cpp files.
You must have:
IMPLEMENT_DYNCREATE(CExodusDoc, CDocument)
in your ExodusDoc.cpp file
You must have:
IMPLEMENT_DYNCREATE(CMainFrame, CFrameWnd)
in your MainFrm.cpp file
You must have
IMPLEMENT_DYNCREATE(CExodusView,CView)
in your ExodusView.cpp file. In this case CView may be different check to see what the base class for CExodusView.
John
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I finally got my program working. I really appreciate the help (and patience). The problem was that I didn't have many of my program files opened, they weren't even listed in the workspace window. I was under the assumtion that the .dsw file would open everything, evidently it does not. I had to reopen all the files manually by using the "SHIFT" key to highlight all of them and then insert them into the program. I don't understand why opening a workspace file (.dsw) wouldn't open everything as the name implies. We'll, I learned a lot here.
Thanks much, Dave
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It was a very simple problem. Being a newbie to VC++, I didn't realize that sometimes the header files don't load with the source files. All of the implementations that you mentioned John were missing because my classes were missing. I had to go to "Project/Insert files" and insert the header files to solve the problem.
Thanks for your patience,
Dave
"The man who reads nothing is better educated than the man who reads nothing but newspapers."- Thomas Jefferson
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I have created a pager control. Can you tell me how to assigned the application toolbar to the pager control? The documentation says touse PGM_SETCHILD, but I don't know how to implement.
Eilzabeth
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1. Create the pager control.
2. Create the toolbar with parent set to the pager control.
3. ::SendMessage( hWndPager, PGM_SETCHILD, 0, hWndToolbar );
Magnus
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I created the pager control successfully. Then I tried to create the toolbar using the return handle from the pager control. When I ran the application, I got an Assertion Failed error at m_wndToolBar.Create function. Can you examin the code below?
HWND h_pager_control = CreatePagerControl();
if ( h_pager_control == NULL)
return -1;
//the toolbar - try to set it as a child of the pager control
if (!m_wndToolBar.Create((CWnd*)h_pager_control) ||
!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
My problem might be in converting h_pager_control to CWnd*.
Eilzabeth
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Yes that is correct you cant cast a HWND to a CWnd*.
I dont use MFC, så I dont know if the pager control is available or not.
But if its not, the you can create a pure CWnd object and call Attach( h_pager_control). Then you can pass that CWnd to toolBar.Create(). Just be sure to to save the CWnd object as long your pager control lives.
And one more thing, dont write if's like you did above, its hard to read and it can be hard for persons not so familiar with C++ to know what will happen. Splitt the two function calls into 2 if's, that way you will get better error handling also.
And if you want more tips, dont use C cast's use C++ casts ( reinterpret_cast, static_cast, const_cast and dynamic_cast )
Magnus
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I got most of the code working. How can I get a handle to the toolbar hWndToolbar?
Eilzabeth
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CWnd has a function called GetSafeHwnd(). And CToolbar is inherited from CWnd.
Magnus signing off for tonight
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Thank you very much for walking me through. I am able to run the following code without runtime error. But I do not see the toolbar. Am I missing some steps?
//the pager control
HWND h_pager_control = CreatePagerControl();
if ( h_pager_control == NULL)
return -1;
//the toolbar - try to set it as a child of the pager control
m_wnd_pager.Attach(h_pager_control);
if (!m_wndToolBar.Create(&m_wnd_pager) )
{
TRACE0("Failed to create toolbar\n");
return -1; // fail to create
}
if (!m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
{
TRACE0("Failed to load menu to toolbar\n");
return -1; // fail to create
}
::SendMessage( h_pager_control, PGM_SETCHILD, 0, (LPARAM)m_wndToolBar.GetSafeHwnd() );
Eilzabeth
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Do you create your pager control with WS_VISIBLE style, otherwise you have to call ::ShowWindow( h_pager_control, SW_SHOW );
Did you remember to set the pager control's parent to the window that should show it?
I dont know if your comment is wrong for the LoadToolBar function, but you cant load menus to a toolbar. You can only load toolbar resource templates.
And depending on when you create your controls, you could have to call InvalidateRect( NULL ) on the pager control's parent (not sure about this tip, as Im not very familiar with MFC).
Magnus
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I added style WS_VISIBLE to the pager control and ran it. Still the toolbar is not visible.
I created the pager control from the frame window CMainFrame. So the pager control should be visible from all child windows. See code below:
HWND CMainFrame::CreatePagerControl()
{
//create the pager control
//initialize page control object
LPINITCOMMONCONTROLSEX lpInitCtrls = new INITCOMMONCONTROLSEX;
lpInitCtrls->dwICC =ICC_PAGESCROLLER_CLASS;
lpInitCtrls->dwSize = sizeof(INITCOMMONCONTROLSEX);
InitCommonControlsEx(lpInitCtrls);
HWND h_pager_control = CreateWindow(WC_PAGESCROLLER,NULL,PGS_HORZ|WS_CHILD|WS_VISIBLE, 0, 0, 0, 0, m_hWnd, NULL ,AfxGetInstanceHandle(),NULL);
if ( h_pager_control == NULL)
{
LPVOID lpMsgBuf;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(),
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR) &lpMsgBuf, 0, NULL);
AfxMessageBox((LPCTSTR)lpMsgBuf);
LocalFree(lpMsgBuf);
}
return h_pager_control;
}
My comments are wrong. It should say can not load toolbar resouce instead of menu resource.
I am not sure about your last question. I added InvalidateRect(NULL)after the pager control was created. It did not help. The pager control is still not visible.
Eilzabeth
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Then I dont really know.
Do you know Spy++? Use that to check if the control is in the parent window. If it is, check its size, position and styles. That could give you some tips on whats wrong.
Or if you like, you can send your projekt (in a zip file) to Shidobu_@hotmail.com and I will check it for you.
I just saw something I missed earlier when I was reading about the pager control. Below is extract from MSDN (short version: you need to handle PGN_CALCSIZE notify message).
************************************************************************
At a minimum, it is necessary to process the PGN_CALCSIZE notification. If you don't process this notification and enter a value for the width or height, the scroll arrows in the pager control will not be displayed. This is because the pager control uses the width or height supplied in the PGN_CALCSIZE notification to determine the "ideal" size of the contained window.
The following example demonstrates how to process the PGN_CALCSIZE notification case. In this example, the contained window is a toolbar control that contains an unknown number of buttons at an unknown size. The example shows how to use the TB_GETMAXSIZE message to determine the size of all of the items in the toolbar. The example then places the width of all of the items into the iWidth member of the NMPGCALCSIZE structure passed to the notification.
case PGN_CALCSIZE:
{
LPNMPGCALCSIZE pCalcSize = (LPNMPGCALCSIZE)lParam;
switch(pCalcSize->dwFlag)
{
case PGF_CALCWIDTH:
{
SIZE size;
SendMessage(hwndToolbar, TB_GETMAXSIZE, 0, (LPARAM)&size);
pCalcSize->iWidth = size.cx;
}
break;
}
}
return 0;
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I have tried all the possibilities I could. But the toolbar is still not showing up. View-ToolBar is never checked in the application. I have sent the project over to you at Shidobu_@hotmail.com. I hope there is a solution for it.
-Elizabeth
Eilzabeth
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I need to create a pager control for the application, which contains the application toolbar. Is OnCreate function at CMainFrame the right place to create it?
Eilzabeth
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Hi
I have a GUI application that does this:
<br />
GUI Thread<br />
AfxBeginThread(...);
AfxBeginThread(...);
I want to capture when both the threads have returned and then enable the Cancel button. What is the most effective way of doing that? I have looked at WaitForMultipleObjects but probably do no know how to implement it.
Thanks in advance
ashish
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You could create a function (in your GUI) to receive a PostMessage from the thread.. that way your application doesn't hang while waiting for the threads to finish.. I could post some code if you want..
Rob
Whoever said nothing's impossible never tried slamming a revolving door!
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Thanks...could you please post.
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I havent compiled any of this so there could be mistakes.. This will allow your threads to post messages to the main GUI..
#define UWM_THREAD_A_DONE WM_APP+1
#define UWM_THREAD_B_DONE WM_APP+2
ON_MESSAGE(UWM_THREAD_A_DONE, OnThreadADone)
ON_MESSAGE(UWM_THREAD_B_DONE, OnThreadBDone)
LRESULT OnThreadADone (WPARAM wParam, LPARAM lParam);
LRESULT OnThreadBDone (WPARAM wParam, LPARAM lParam);
LRESULT CMainFrame::OnThreadADone(WPARAM wParam, LPARAM lParam)
{
return TRUE;
}
LRESULT CMainFrame::OnThreadBDone(WPARAM wParam, LPARAM lParam)
{
return TRUE;
}
Inside the Thread "A" do a PostMessage(UWM_THREAD_A_DONE,0,0);
Hope it helps..
Rob
Whoever said nothing's impossible never tried slamming a revolving door!
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The following code can be used to test if the threads are still running:
HANDLE hThreads[2];
hThreads[0] =
hThreads[1] =
DWORD dwCode = WaitForMultipleObjects(2,hThreads,TRUE,0);
if ( dwCode == WAIT_TIMEOUT ) {
}
[EDIT]
The 0 in the last parameter of WaitForMultipleObjects indicates to test and return immediately if you want to wait longer you can enter a value or INFINITE to wait until both threads end.
[/EDIT]
John
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I actually want both threads to finish, not one of them. So if I use TRUE for Parm 3 of WaitForMultipleObjects, then as soon as one thread exists, won't my statement return?
I acutally tried this:
<br />
HANDLE hEvents[2] = {NULL,NULL};<br />
CWinThread *pThread1,*pThread2;<br />
<br />
try<br />
{ <br />
m_bRestartMode = IsRestartMode();<br />
<br />
if(!m_bRestartMode)<br />
{<br />
if(GetPendingANI() == SAL2UNI_RETCODE_SUCC)<br />
{<br />
pThread1 = AfxBeginThread(BeginWorker,(LPVOID)this);<br />
pThread2 = AfxBeginThread(CRMWorker,(LPVOID)this);<br />
}<br />
}<br />
else<br />
{<br />
if(Restart())<br />
{<br />
pThread1 = AfxBeginThread(BeginWorker,(LPVOID)this);<br />
pThread2 = AfxBeginThread(CRMWorker,(LPVOID)this);<br />
}<br />
}<br />
<br />
hEvents[0] = pThread1->m_hThread;<br />
hEvents[1] = pThread2->m_hThread;<br />
<br />
}<br />
catch(CDaoException *daoe)<br />
{<br />
CString sErrorMsg,sErrNo;<br />
CDaoErrorInfo *errInfo = daoe->m_pErrorInfo;<br />
<br />
<br />
sErrNo.Format("%d", errInfo->m_lErrorCode);<br />
sErrorMsg = "Error No.: " + sErrNo + " - " + errInfo->m_strDescription;<br />
sErrorMsg += " occurred in application " + errInfo->m_strSource;<br />
LogActivity(CA_MSG_SEVERITY_INFORMATION,sErrorMsg);<br />
daoe->Delete();<br />
<br />
}<br />
<br />
WaitForMultipleObjects(2,hEvents,FALSE,INFINITE);<br />
LogActivity(CA_MSG_SEVERITY_INFORMATION,"Both threads returned");<br />
<br />
And my code just got hung....none of the two worker threads did any work and I never got to LogActivity(...) below WaitForMultipleObjects.
Thanks
ashish
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He was probably assuming that you were running this in a loop.. checking every so often to see if both the threads exited.. You could set the Infinate flag and not even use the loop.. then it would wait until both exited.. Could be infinate if for some reason one of your threads hung..
HANDLE hThreads[2];
hThreads[0] =
hThreads[1] =
while(true)
{
DWORD dwCode = WaitForMultipleObjects(2,hThreads,TRUE,100);
if ( dwCode == WAIT_TIMEOUT )
{
}
else
{
break;
}
}
Whoever said nothing's impossible never tried slamming a revolving door!
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achandra007 wrote:
So if I use TRUE for Parm 3 of WaitForMultipleObjects, then as soon as one thread exists, won't my statement return?
You do want TRUE for param 3 because that means to wait for both threads to finish. Are you sure that the threads are finishing? I have used this technique in the past with CreateThread() but not AfxBeginThread but the result should be the same.
John
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I am currently looking for the highest quality, easiest to implement, most secure and most reliable peer to peer c++ package avaliable to implement peer to peer networking in c++.
The company I work for already has a very robust and complex program which operates under a client-server network architecture. I am exploring migrating that architecture to peer to peer.
I have so far come across what appear to be the three best packages avaliable online:
1) P2PToolkit - www.p2ptoolkit.com
2) Howl - http://www.swampwolf.com/products/
3) JXTA-C - http://jxta-c.jxta.org/servlets/ProjectHome
Obviously, there is always the option of coding it up ourselves and not using a pre-defined package but I estimate that would take more time and money than necessary.
We have done some initial testing of P2PToolkit sample programs and have found them to be extremely unstable and unreliable. Then again, those were just the sample programs given online. HOWL seems encouraging as it uses the Zeroconf "standard" adopted by Apple Computer, but there is a discouraging amount of documentation avaliable.
I am very excited by the JXTA program and we have other projects which have used it in java-implementations of peer to peer networking. JXTA-C would be a definite choice, especially in light of its claims of interoperability, except according to the JXTA-C program site, its not finished and has not had any kind of final release. In fact, according to the program site, the majority of the project hasn't been touched in at least a year, which implies forward progress stopped in some way.
Does anyone out there have any suggestions about any of the three aforementioned Peer to Peer packages, either from experience or knowledge? Has anyone worked on a large scale project involving peer to peer networking and could share their experience?
Thanks in advance.
-EEder
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