Re: How do I form the HTTP headers to DL a .CAB file? - C / C++ / MFC Discussion Boards

Re: Bitwise Left Shift

Antony M Kancidrowski20-May-04 5:25

Antony M Kancidrowski

20-May-04 5:25

I see what you have done. You need to AND with 255 to get the answer.

Ant.

Re: Bitwise Left Shift

deniz79s20-May-04 9:01

deniz79s

20-May-04 9:01

one time right shift is like divide with 2 and one time left shift is like multiple wiht 2. So How can you find 136 result

It is illegal to call out while inside message filter

Member 53435720-May-04 4:55

Member 534357

20-May-04 4:55

I am running my application in Visual Studio .NET & am getting the following error "It is illegal to call out while inside message filter"
What can be causing this error to occur?

Thanks

Re: It is illegal to call out while inside message filter

Andrew Quinn AUS20-May-04 5:14

Andrew Quinn AUS

20-May-04 5:14

Hi,

From my experience - this is caused by COM re-entrancy.

For example, COM server has called back into your app (via eventing) and you are then calling back into the COM server.

COM's telling you its blocking the call because it hasn't finished processing the previous method call.

I did the following which still blocks but without the annoying message

class CBusyState
{
public:

	// Constructor - by default the busy state is entered
	CBusyState(BOOL bEnterBusyState = TRUE, 
		SERVERCALL scBusyReply = SERVERCALL_RETRYLATER)
		: m_bBusy(FALSE)
	{
		// get the MFC message filter implementation. This will return NULL if called from a DLL.
		m_pMessageFilter = AfxOleGetMessageFilter();
		if (bEnterBusyState)
		   Begin(scBusyReply); // enter the busy state
	}

	// Destructor - ends the busy state (if previously entered)
	~COasisBusyState()
	{	
		End(); // end the busy state
	};

	// Begins the busy state. By default, any incoming COM calls will be
	// rejected, but retried later
	BOOL Begin(SERVERCALL scBusyReply = SERVERCALL_RETRYLATER)
	{	// check that we have a message filter, and that we're not already
		// busy.
		if (m_pMessageFilter && !m_bBusy)
		{	// set the reply code for IMessageFilter::HandlingIncomingCall()
			m_pMessageFilter->SetBusyReply(scBusyReply);
			// enter the busy state
			m_pMessageFilter->BeginBusyState();
			m_bBusy = TRUE;
		}
		return m_bBusy;
	}

	// Ends the busy state, if previously entered
	void End()
	{	// check that we have a message filter, and that we're busy
		if (m_pMessageFilter && m_bBusy)
		{	// end the busy state
			m_pMessageFilter->EndBusyState();
			m_bBusy = FALSE;
		}
	}

private:
	BOOL			m_bBusy;
	COleMessageFilter*	m_pMessageFilter;
};

Then whenever we call the COM server, I'd put the object on the stack, e.g.

function xyzxyzxyz()
{
CBusyState blocker(TRUE);
MyCOMServer->method(xyz)
}

Hope this helps,
Andy

Re: It is illegal to call out while inside message filter

Member 53435720-May-04 6:27

Member 534357

20-May-04 6:27

Thanks alot for your response, I will try your idea, for now I put some workaround in my code.

Thanks again for the info.

How do I form the HTTP headers to DL a .CAB file?

Terry O'Nolley20-May-04 4:39

Terry O'Nolley

20-May-04 4:39

I am getting server errors when trying to download a CAB file from a webserver.

I think the problem is that the default headers don't allow for CAB file mime type.

What string do I need to use in my call to
CHttpFile.AddRequestheaders(); to get this file?

I believe this is the problem, because if I change the URL to point to an HTML page, but leave everything else the same, then the file downloads just fine.

Thanks!

(I am also posting this in the Web Develpment forum)

//placeholder for witty verbiage

Re: How do I form the HTTP headers to DL a .CAB file?

Alexander ^M.,20-May-04 5:26

Alexander ^M.,

20-May-04 5:26

does "GET /.../.../foo.cab" really not work?

Don't try it, just do it! Wink | ;-)

Re: How do I form the HTTP headers to DL a .CAB file?

Terry O'Nolley20-May-04 6:29

Terry O'Nolley

20-May-04 6:29

You won't believe this - when I read your response I changed my mindset from "Why does it work with an HTM file but not a CAB file" to "It is supposed to work with a CAB file, so what else could be wrong?" because of the way you worded it Smile | :)

Thanks!

When I changed the #define from my clients production server to my test server, I forgot to change the #define'd path from my client's path to the path on my server Blush | :O

Of course it works just fine now Smile | :)

Thanks for the push in the right direction!

//placeholder for witty verbiage

about MSChart

yingkou20-May-04 3:16

yingkou

20-May-04 3:16

I have set a MSChart control in my dialog,a error happened.

m_Chart.SetColumn(i);

when i=5,compiler shows :index given is out of bound and i=4,all right. Why?

Re: about MSChart

*Dreamz20-May-04 4:13

*Dreamz

20-May-04 4:13

I think the default column count in the control is 4.You can set the number of columns from the properties of the control.

Re: about MSChart

yingkou20-May-04 14:03

yingkou

20-May-04 14:03

thanks a lot,I have resulved this problem.

Idle time in VC++

Anonymous20-May-04 3:08

Anonymous

20-May-04 3:08

How can i calculate the idle time of machine in VC++.

Re: Idle time in VC++

David Crow20-May-04 4:16

David Crow

20-May-04 4:16

Does GetLastInputInfo() help?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Idle time in VC++

Anonymous22-May-04 3:46

Anonymous

22-May-04 3:46

i have used GetLastInputInfo() but its not working.

Re: Idle time in VC++

David Crow22-May-04 17:01

David Crow

22-May-04 17:01

Anonymous wrote:
...its not working.

Meaning what? You get a compiler/linker error? It doesn't produce the desired result? Please explain further.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Idle time in VC++

Kamyar Souri20-May-04 9:29

Kamyar Souri

20-May-04 9:29

Use Profiler in Build menu.
It may help

Kamyar Souri
Booria CAD/CAM Systems
www.booria.com

A question about CRuntimeClass and Dynamic Creation

SmilingHeart20-May-04 2:48

SmilingHeart

20-May-04 2:48

I want to implement a funtion.The follwing is its prototype:
CRuntimeClass* FindClass(CString &strClassName)
Parameter strClassName is the name of some class. I want to get the CRuntimeClass member variable of the class whose name is strClassName.

For example :
CString strClassName="CMyView";
CRuntimeClass * pRtc=FineClass(strClassName);
~~~~~~~~ I hope that I can get the pointer of CRuntimeClass member variable of CMyView;

Thanks for your help

I love sea

Re: A question about CRuntimeClass and Dynamic Creation

Andrew Quinn AUS20-May-04 3:39

Andrew Quinn AUS

20-May-04 3:39

Hi,

My first thought would be to add a CMapStringToPtr object into your CDocument class

Then, on the constructor of each and every object you'll need, add a call to the object, e.g.

CMyView::CMyView() : CFormView(CMyView::IDD)
{
   //{{AFX_DATA_INIT(CMyView)
   //}}AFX_DATA_INIT

   CMyDoc* pDoc = GetDocument();
   if (pDoc) pDoc->RegisterClass(GetRuntimeClass()->m_lpszClassName, GetRuntimeClass());
}

We then need to remember to add an 'unregister' to the destructor...MOST important if you have any objects that will get destroyed/recreated during the lifetime of the application - otherwise the pointer held in the map will point to junk memory

CMyView::~CMyView()
{
   CMyDoc* pDoc = GetDocument();
   if (pDoc) pDoc->UnregisterClass(GetRuntimeClass()->m_lpszClassName);
}

Here are the functions in the Document...

BOOL CMyDoc::RegisterClass(const CString& strClassName, const CRuntimeClass* pClass)
{
	CRuntimeClass* pLookup = NULL;
	if (m_mapRuntimeClasses.Lookup(strClassName, (void*&)pLookup))
		UnregisterClass(strClassName); // Remove existing entry ???
	
	m_mapRuntimeClasses.SetAt(strClassName, ( void*& )pClass);
	return TRUE;
}

BOOL CMyDoc::UnregisterClass(const CString& strClassName)
{
	BOOL bRet = FALSE;

	CRuntimeClass* pLookup = NULL;
	if (m_mapRuntimeClasses.Lookup(strClassName, (void*&)pLookup))
		bRet = m_mapRuntimeClasses.RemoveKey(strClassName);

	return bRet;
}

The m_mapRuntimeClasses is the CMapStringToPtr object - if you wanted to be all OO about it, then best to encapsulate the functions you want into a derived CMapStringToPtr object and have this in your CDocument.

For any objects that need access to the document (other than views that already do), then preferred approach is:

CFrameWnd* pFrame = (CFrameWnd*)AfxGetApp()->m_pMainWnd;
if (pFrame && pFrame->GetSafeHwnd())
{
    CMyDoc* pDoc = (CMyDoc*)pFrame->GetActiveDocument();
    if (pDoc) pDoc->Register(.....);
}

Hope this helps,
Andy

Re: A question about CRuntimeClass and Dynamic Creation

SmilingHeart21-May-04 18:54

SmilingHeart

21-May-04 18:54

Thanks a lot.

I love sea

Re: A question about CRuntimeClass and Dynamic Creation

igor196020-May-04 11:06

igor1960

20-May-04 11:06

Your ModuleState has a public member m_classList that you can enumerate through to find what you want...

// search app specific classes
AFX_MODULE_STATE* pModuleState = AfxGetModuleState();
AfxLockGlobals(CRIT_RUNTIMECLASSLIST);
for (pClass = pModuleState->m_classList; pClass != NULL;
pClass = pClass->m_pNextClass)
{
if (lstrcmpA(szClassName, pClass->m_lpszClassName) == 0)
{
AfxUnlockGlobals(CRIT_RUNTIMECLASSLIST);
return pClass;
}
}
AfxUnlockGlobals(CRIT_RUNTIMECLASSLIST);

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

Re: A question about CRuntimeClass and Dynamic Creation

SmilingHeart21-May-04 18:52

SmilingHeart

21-May-04 18:52

I have tried your code. But it does not work.
"pModuleState->m_classList" is always eaqual to 0x0000. Can you tell me the reason?

I love sea

Re: A question about CRuntimeClass and Dynamic Creation

igor196022-May-04 11:55

igor1960

22-May-04 11:55

The only reason it may not work is because you are using MFC in shared DLLs -- check _AFXDLL preprocessor definition and if it's defined you may use the following code:
// search app specific classes
AFX_MODULE_STATE* pModuleState = AfxGetModuleState();
AfxLockGlobals(CRIT_RUNTIMECLASSLIST);
for (pClass = pModuleState->m_classList; pClass != NULL;
pClass = pClass->m_pNextClass)
{
if (lstrcmpA(szClassName, pClass->m_lpszClassName) == 0)
{
AfxUnlockGlobals(CRIT_RUNTIMECLASSLIST);
return pClass;
}
}
AfxUnlockGlobals(CRIT_RUNTIMECLASSLIST);
#ifdef _AFXDLL
// search classes in shared DLLs
AfxLockGlobals(CRIT_DYNLINKLIST);
for (CDynLinkLibrary* pDLL = pModuleState->m_libraryList; pDLL != NULL;
pDLL = pDLL->m_pNextDLL)
{
for (pClass = pDLL->m_classList; pClass != NULL;
pClass = pClass->m_pNextClass)
{
if (lstrcmpA(szClassName, pClass->m_lpszClassName) == 0)
{
AfxUnlockGlobals(CRIT_DYNLINKLIST);
return pClass;
}
}
}
AfxUnlockGlobals(CRIT_DYNLINKLIST);
#endif

For an example of usage check code for
CRuntimeClass* PASCAL CRuntimeClass::Load(CArchive& ar, UINT* pwSchemaNum)
in MFC ArcCore.cpp file -- above example is taken from it -- it's used to load class during serialization...
It just have to work, otherwise serialization cannot be achieved...

Regards,
Igor

"...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

Help needed with CStdioFile

Chooikw20-May-04 2:41

Chooikw

20-May-04 2:41

I'm trying to check the update list from my webserver and then determine whether to update the program.But when i try to write something into my current installed list,it will cause an error for the next move. here is my code:
void CProjectXDlg::CheckUpdate(void)
{
CInternetSession session("Update");
CStdioFile* pFile=NULL;
CStdioFile fUpdateList;
CString strBuf,strBuf2;
pFile=session.OpenURL(host+"updatelist.txt");
fUpdateList.Open("applied.txt",CFile::modeReadWrite|CFile::modeNoTruncate|CFile::modeCreate);
while(pFile->ReadString(strBuf))
{
fUpdateList.ReadString(strBuf2);
if(strBuf!=strBuf2)//not same,go update!
{
fUpdateList.WriteString(strBuf+"\n");
}
}
fUpdateList.Close();

pFile->Close();
if(pFile)delete pFile;
session.Close();
}

the applied.txt will have some weird characters stored in...

Re: Help needed with CStdioFile

David Crow20-May-04 2:47

David Crow

20-May-04 2:47

Chooikw wrote:
the applied.txt will have some weird characters stored in...

You are reading from and writing to the same file. What did you expect to happen?

What are the "weird characters" you mention?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Help needed with CStdioFile

Chooikw20-May-04 3:10

Chooikw

20-May-04 3:10

>You are reading from and writing to the same file. What did you expect to happen?

What should I do if I want to compare each line of the file and then correct the applied.txt when it isn't same with the updatelist.txt in my server?

>What are the "weird characters" you mention?
there is lot of "ÍÍÍÍ"

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