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It sounds like cout is doing some buffering. How about:
while (WaitForSingleObject(pi.hProcess, 1000))
{
cout << "." << flush;
}
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Yep, that would do it! I actually ended up using cerr, as I believe that this is
cout and flush combined as cerr doest use a buffer at all.
Will play around with both a see what I get.
Cheers for the help!!
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Hi all,I'm creating a memory management class, that is fairly basic, so you can easily set the size of a block of memory. I have based it in mind for use in arrays and have setup a template class to do it so I could use it to manage the memory of any object. The trouble I'm getting occurs when trying to store the contents of another template container because malloc does not initialise the contents. ZeroMemory doesn't work either because the __vfptr gets initialised to zero instead of the associated virtual functions pointer associated with the class of type T (which means cleaning up causing problems such as crashing cos its in effect calling a NULL pointer function). How then, can I properly initialise something (i.e. call its constructor) when I'm working with pointers to (possibly an array) of type T? I'm using malloc((void*)m_pItem, alloc_length); to allocate enough space for the object m_pItem which is of type T, could I have m_pItem[0] = new T? or would this be inefficient to scan through the newly allocated areas of memory? Some ideas guys if you please  ,
Alan.
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Why do you use malloc, use new and more precise the placement new functionality. just search for "placement new" on google for examples on how to use it.
Magnus
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There's a not-so-known C++ construct designed just to solve this, it is called placement new:
new (static_cast<void*>(m_pItem)) T; This is a variation of the standard new in which you provide a void * where the object is to be laid out. The effect is equivalente to calling the constructor of the class for an object at the memory position indicated.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Thanks for the response guys, placement new huh, didn't realise it existed. I was using malloc because it gives slightly less overhead than new, but I suppose thats cos it doesn't initialise any of its data which I want it to. Thanks people, very helpful.
Alan.
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Dear All,
I am developing an application in MFC VC++ Version 6.0 for Windows 2000.
How can we can one exec from another exe. ie. want to call another exe on click of a button.
Is there any Shell level api available ??? (excluding WinExec)
Feel free to ask any further queries in this regards,
Thanks
Rohit Dhamija
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If you mean to start another program when you click a button, then you use the CreateProcess API.
If you really must use the Shell API, then its ShellExecuteEx you will need. But I would recommend that you use CreateProcess.
Magnus
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Is it possible to detect whether the process has finished with either of these API's (CreateProcess / ShellExecute) ?
If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.
Rudyard Kipling
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Thanks Nish (& everyone else). That seemed to solve the prob
If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts you aim;
Yours is the Earth and everything that's in it.
Rudyard Kipling
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you can use WaitForSingleObject or WaitForMultipleObjects
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You can use WaitForSingleObject on the handle that is returned in PROCESS_INFORMATION::hProcess.
Or you can poll with GetExitCodeProcess
Magnus
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I am building an ActiveX control using MFC.
I wonder how can I update the property window when I change a property of type IUnknown from the property page?
I did the following but it is not working with IUnknown property:
In the DoDataExchange of the property page I called a function that sets a new value for the property as follows:
In the property page file:
void CMyPropertyPage::DoDataExchange(CDataExchange* pDX)
{
// NOTE: ClassWizard will add DDP, DDX, and DDV calls here
// DO NOT EDIT what you see in these blocks of generated code !
//{{AFX_DATA_MAP(CPowerListPpgData)
.
.
//}}AFX_DATA_MAP
DDP_PostProcessing(pDX);
if (pDX->m_bSaveAndValidate)
SaveValue();
}
BOOL CMyPropertyPage::SaveValue(IUnknown* lpPropValue, LPCTSTR lpstrPropName)
{
USES_CONVERSION;
COleDispatchDriver PropDispDriver;
ULONG ulObjects;
LPDISPATCH *ppDisp = GetObjectArray(&ulObjects);
DISPID dwDispID;
LPCOLESTR lpOleStr = T2COLE(lpstrPropName);
for(ULONG i = 0; i < ulObjects; i++)
{
if(SUCCEEDED(ppDisp[i]->GetIDsOfNames(IID_NULL, (LPOLESTR*)&lpOleStr, 1, 0, &dwDispID)))
{
PropDispDriver.AttachDispatch(ppDisp[i], FALSE);
PropDispDriver.SetProperty(dwDispID, VT_UNKNOWN, lpPropValue);
PropDispDriver.DetachDispatch();
}
else
return FALSE;
}
return TRUE;
}
In the CTL file:
void CMyCtrl::SetMyProperty(LPUNKNOWN newValue)
{
.
BoundPropertyChanged(dispidMyProperty);
SetModifiedFlag();
}
Is there special case for the proeprties of type IUnknown?
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Hello, Sir:
Maybe i want to catch some exception where my program? Has somebody a class of catching and managing exception? Can you help me?
Thanks in advance.
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HansonDavid wrote:
Maybe i want to catch some exception where my program? Has somebody a class of catching and managing exception?
C++ has exception handling in the language. eg.
try
{
...
}
catch( some_exception e )
{
}
and Windows has Structured Exception Handling - SEH. There are a number of good articles here on CP on Exception handling which should help you get started.
Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com
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Thanks Sir. Maybe I want a class of catching and managing exception. Because i am working a program . The programe need some FPU instruction. I am afraid of these FPU instrucrions generating some exception error. And i want to catch these exception and manage these exception. I think jusut a class maybe is better.
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what do you want to do ?
maybe have a look at "wizard" type dialogs sequence ...
Maximilien Lincourt
"Never underestimate the bandwidth of a station wagon filled with backup tapes." ("Computer Networks" by Andrew S Tannenbaum )
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is there any way other than using CPropertyPages and CPropertySheets?
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Property sheets and pages are a good solution. Alternatively you can create another dialog every time the previous one exits (ugly), or you create one dialog and move the controls around dynamically depending on the events (not very reusable).
Lorenz Prem
Microsoft Corporation
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Hello all,
As a beginner in MFC/Visual C++, I'm trying to write a very simple text editor in order to learn things. I am using the SDI framework which associates a frame window, a view and a document. The code is very short and simple, and is nearly identical to the MULTIPAD sample found in VC++, except that it's using SDI instead of MDI.
When I type text in the window, it gets displayed correctly, but when I try to open a file, all I get on my screen are strange | characters and not the content of the file.
I've traced the program execution CEditView::SerializeRaw() (my CDocument derived class calls SerializeRaw() in its Serialize() method) to see what could be wrong. I've found that the file gets read properly, and looking at the buffer's content in CEditView::ReadFromArchive(), all is OK at this point. This suggests that something goes wrong after the call to CEditView::GetEditCtrl()::SetHandle(). Since SetHandle() is implemented using messages, I don't know how to debug this further.
I'm having a hard time figuring out what is possibly wrong with this code, and any help would be greatly appreciated.
Thanks,
Maxime
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Hello all,
As a beginner in MFC/Visual C++, I'm trying to write a very simple text editor in order to learn things. I am using the SDI framework which associates a frame window, a view and a document. The code is very short and simple, and is nearly identical to the MULTIPAD sample found in VC++, except that it's using SDI instead of MDI.
When I type text in the window, it gets displayed correctly, but when I try to open a file, all I get on my screen are strange | characters and not the content of the file.
I've traced the program execution CEditView::SerializeRaw() (my CDocument derived class calls SerializeRaw() in its Serialize() method) to see what could be wrong. I've found that the file gets read properly, and looking at the buffer's content in CEditView::ReadFromArchive(), all is OK at this point. This suggests that something goes wrong after the call to CEditView::GetEditCtrl()::SetHandle(). Since SetHandle() is implemented using messages, I don't know how to debug this further.
I'm having a hard time figuring out what is possibly wrong with this code, and any help would be greatly appreciated.
Thanks,
Maxime
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Hi there,
i wrote a ocx in MFC which has no user interface (hust empty rectangle is
display on the client form).
However, PreTranslateMessage is never called.
How can i solve that problem?
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It's not your problem.
Container implementation should call IOleInPlaceActiveObject::TranslateAccelerator method when properly implemented.
Regards
"...Ability to type is not enough to become a Programmer. Unless you type in VB. But then again you have to type really fast..."
Me
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