C / C++ / MFC Discussion Boards

James R. Twine16-Jan-07 8:45

16-Jan-07 8:45

   Closing the handles as shown will not cause the applications to shut down, so I am not sure that this was your intent, it simply releases the calling/parent app's "reference" to them, same as how closing a thread handle does not cause that thread to die immediately.

   I do not believe that your suggestion will allow the calling app to ensure that the child apps have closed - they can ignore the WM_CLOSE message, or otherwise return from handling it and still be running.

   Actually waiting for the handles to become signaled tells you when the apps have shut down (or, after a certain timeout, that they have not).

--- Edit: OK - you may have been specifically talking about how to cause the other two applications to initiate shutdown, as opposed to my suggestion of using an Event. Yes, that works as well, and is a bit simplier, but it should be mentioned that this only works for applications/processes that have a window and are pumping messages. And you still have to get the window handles for those child processes.

   Peace!

-=- James
Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles

Thunks

Waldermort16-Jan-07 7:16

Waldermort

16-Jan-07 7:16

I'm getting closer to MFC each day D'Oh! | :doh:

I have now got into the habit of using thunks whenever a callback may be required within one of my classes. My code works perfectly, but only on Intel 32bit machines. I have placed exclusion guards around my template to prevent compiling for anything other than said machine, but now is the time to do it correctly.

This is my thunk:

struct THUNK
{
    m_mov     = 0xB9;  // mov to ecx this ptr
    m_this    = obj;
    m_jmp     = 0xE9;  // jmp to new address
    m_relproc = Cast<char*>(proc) - Cast<char*>(this) - sizeof(THUNK);
}

This allows me to thunk without casting the hWnd paramaters. What would the equivlent be for a 64bit machine?

Re: Thunks

James R. Twine16-Jan-07 7:28

James R. Twine

16-Jan-07 7:28

   Not knowing that much about thunks anymore, my first guess would be to account for the pointer size and structure layout/padding differences (this goes from 32-bit to 64-bit, and the size of the structure may now lie on a different boundary), but other than that, nothing that I can think of.

   But I am no expert in the field of thunks... :P

   Peace!

Can I raise Exception in one thread and handle it in another?

chilituna16-Jan-07 6:51

chilituna

16-Jan-07 6:51

Hi,

I am a bit curious.. Can I raise exception (with RaiseException()?)
and get it handled in another thread??

This is needed for operation stop-functionality.
I thought it would be nice to have one dialog
where is stop button, and it stops whatever the
main thread is doing..

Does anybody know how it is done in Visual Studio?
It's possible to freeze the debugged process anytime,
when debugging.

Re: Can I raise Exception in one thread and handle it in another?

James R. Twine16-Jan-07 7:03

James R. Twine

16-Jan-07 7:03

I do not think that the exception will cross threads. I would suggest using a Win32 Event object, because it can be seen by multiple threads, and signal it in one thread to indicate the other to stop processing.

Peace!

Re: Can I raise Exception in one thread and handle it in another?

David Crow16-Jan-07 7:33

David Crow

16-Jan-07 7:33

chilituna wrote:
I thought it would be nice to have one dialog
where is stop button, and it stops whatever the
main thread is doing..

Is the dialog modal?

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: Can I raise Exception in one thread and handle it in another?

Michael Dunn16-Jan-07 8:28

Michael Dunn

16-Jan-07 8:28

chilituna wrote:

Can I raise Exception in one thread and handle it in another?

No, the handler has to be somewhere in the throwing thread's call stack.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ");

IOCP+weird latency problem

Polity4h16-Jan-07 6:32

Polity4h

16-Jan-07 6:32

Hi, again a question about me with my IOCP skills Smile | :)

ok, the situation is the following, everything works perfectly except for 1 thing, a really weird thing if you ask me.
I'm currently testing so i use 1 WorkerThread with 1 udp virtual connection at the time.
When i do a WSARecvFrom, i should recieve a buffer with a size of lets say 600 bytes. This hapends idd but later, here is my thing:

GetQueuedCompletionStatus(...)<br />
DWORD ioSize = 0;<br />
case RequestSend:<br />
//WSASendTo and set to AfterSend<br />
break;<br />
case AfterSend:<br />
//Sended 8 bytes, now recieve with WSARecvFrom and set to AfterRecieve<br />
ioSize = static_cast<DWORD>(lpOverlapped->InternalHigh);<br />
break;<br />
case AfterRecieve:<br />
ioSize = static_cast<DWORD>(lpOverlapped->InternalHigh);<br />
//do rest

This is the things i do, now it happends that in AfterRecieve, ioSize is the same as the size when i sended. better said, the data aint recieved yet, however i do get a notification that the data is recieved. When i put a breakpoint at that point, i see that the data is deliverd, to pull a conclusion, I get a notification when the data is recieved well it isnt untill i put a breakpoint at that place, really weird
weird story so:

dwIoSize = static_cast<DWORD>(ptrOverlapped->InternalHigh);<br />
ptrSession->incRecvBytes(dwIoSize);<br />
if ((iTemp = ptrGameClass->UnpackServerInfo(ptrSession->getNDServer(), &objToolset)) == 0){//Session is finished!<br />
    pThis->FinishGame(ptrSession->getNDServer());<br />
    __REPORT("SUCCEEDED");<br />
}<br />
else if (iTemp < 0){<br />
    __REPORT("%s->UnpackServerInfo() failed", ptrGameClass->Gamename());<br />
}

To make it even more clear, whenever i put a breakpoint at: ptrSession->incRecvBytes(dwIoSize);, dwIoSize is 8 as the send buffer, but ptrOverlapped->InternalHigh is like 600 bytes.
When i do reports, it just reports that ptrOverlapped->InternalHigh is 8

Re: IOCP+weird latency problem [modified]

Mark Salsbery16-Jan-07 7:13

Mark Salsbery

16-Jan-07 7:13

For socket operations you should't be touching (or looking at) anything in the OVERLAPPED
structure. None of it applies to IOCPs and especially the "Internal" fields which are for use
by the system so they have NO meaning to your code.

Ok, you can look at them, but don't expect any specific values Smile | :)

I would suggest clearing the OVERLAPPED struct to 0s before every operation.
If you need to add your own fields (I'm not sure how one would do overlapped ops without doing
this) then define your own struct which includes an OVERLAPPED struct.

You may have seen these, but here's a couple articles that helped me alot when I first used an
IOCP...

Writing Windows NT Server Applications in MFC Using I/O Completion Ports [^]

Windows Sockets 2.0: Write Scalable Winsock Apps Using Completion Ports[^]

INFO: Design Issues When Using IOCP in a Winsock Server[^]

~~And this one's in the online help -~~ <--edit

-- modified at 13:21 Tuesday 16th January, 2007

Code Snippets availability for C++ in VS2005.

oleg6316-Jan-07 5:45

oleg63

16-Jan-07 5:45

Hi,

I want to use the Code Snippets in Visual C++ VS2005 Professional.
But it seems it's not exist here.
When I go menu Tools\Code Snippets Manager I can not select a C++ from the "Language" combo box.
Is there some way to activate the Code Snippets stuff in C++, or it's available in another editions of Visual Studio 2005(for example VS2005 Developer Edition)?

Thanks.

Re: Code Snippets availability for C++ in VS2005.

Christian Graus16-Jan-07 8:38

Christian Graus

16-Jan-07 8:38

Code snippets don't exist in C++, apparently, we're too smart to need them

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Re: Code Snippets availability for C++ in VS2005.

James R. Twine16-Jan-07 9:05

James R. Twine

16-Jan-07 9:05

Ha!

Peace!

Re: Code Snippets availability for C++ in VS2005.

S Douglas16-Jan-07 23:01

S Douglas

16-Jan-07 23:01

Christian Graus wrote:
Code snippets don't exist in C++,

Yea they do, I downloaded it but still haven't gotten around to installing See > Microsoft Visual Studio 2005 IDE Enhancements[^]

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

Re: Code Snippets availability for C++ in VS2005.

S Douglas16-Jan-07 23:00

S Douglas

16-Jan-07 23:00

oleg63 wrote:
Code Snippets in Visual C++ VS2005

C++ was not included as part of the original snippet functionality. They did add it in later via a power toy. See Microsoft Visual Studio 2005 IDE Enhancements[^]

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

Video Overlay in MFC

BoroDave16-Jan-07 4:30

BoroDave

16-Jan-07 4:30

Hi
I have built an app using the TransparentButtonDemo and Video Manipulation demos i have found on here. The video is using vmr9 and the relevant video is loaded and starts playing dependant on the button pressed on my dialog.

It is going to be necessary to have some information overlayed on the video while it is playing but any dialog items i add render behind the video. Is there an easy way to get a couple of mfc components to render on top of the video?

Thanks in advance guys

Dave

Re: Video Overlay in MFC

Mark Salsbery16-Jan-07 7:28

Mark Salsbery

16-Jan-07 7:28

Not without flicker. Every time a new frame is drawn it will be on top.

The video mixing renderer, as its name implies, is made for mixing video. You can alpha-blend
any bitmap onto the video stream. I suppose you could draw dialog items to a bitmap and mix them
with the video but I'm not sure how the user interface would work.

An easier method would be (IMO) to write your own renderer so you can control the rendering of
frames. You could use clipping regions or whatever to allow underlying items to show through.

Mark

Select static control when overlapped

Vishvanathan16-Jan-07 3:18

Vishvanathan

16-Jan-07 3:18

Hi Friends,

In my application, I created no of static label at run time and it derived from CStatic class. That static window placed by SetWindowPos function.
example:

m_Label.SetWindowPos( pWnd->wndTOp, CRect ( 10,10,50,50),SWP_SHOWWINDOW);

The first parameter used to set the window zorder . Am I correct?

At run time, How can the user select pariticular control when they are overlapped?
Like,In MS word document, The user can draw no of rectangle box and overlapped between them. The user can able to select the top most window or the tracker enable window.

In my application, I am using CRectTracker class. It used to track the static label.How can i select tracker enabled label or top of the label when they are overlapped?

Thanks and Regards,

<b></b>

Vichu

Re: Select static control when overlapped

Rage16-Jan-07 5:44

Rage

16-Jan-07 5:44

Vishvanathan wrote:
The first parameter used to set the window zorder . Am I correct?

Nope. The first parameter is the handle of the window, after which you will insert your window). The last parameter is the new z-order.

Have a look at this article[^] for the rest of your question.

Re: Select static control when overlapped

James R. Twine16-Jan-07 7:01

James R. Twine

16-Jan-07 7:01

   The OP seems to be calling the CWnd version of the function, in which the first parameter is the window to to insert after in the Z-Order.

   Neither the CWnd or Win32 version of the function takes an HWND as the last parameter, although the last parameter (flags) indicates how to treat that parameter.

   Peace!

Re: Select static control when overlapped

James R. Twine16-Jan-07 7:01

James R. Twine

16-Jan-07 7:01

Vishvanathan wrote:
The first parameter used to set the window zorder . Am I correct?

   Yes, but the last parameter tells the function how it should treat the Z-Order parameter.

   I believe that the functionality of object selection in applications like Word and Visio is implemented by the application itself. There is nothing that I know of built into Win32 to give you that kind of "design-space" functionality.

   You will have to track where the user is clicking the mouse, and see what object(s) are under that point, and then select a particular control depending on what the user is trying to do. For example, are they trying to select an item, select an additional item to add it to a group selection, or remove an item from a group selection, and then you will be able to extend your selection rectangle (or multiple ones) around the objects involved.

   Peace!

Need some help with visual c++ and sql2000 ado connection

XTr1NiTy16-Jan-07 2:39

XTr1NiTy

16-Jan-07 2:39

Greetings everyone, I need to connect a visual embedded c++ application to a sql2000 database over a wifi connnection. I am rather new in the c++ development, so please bear with me.
And as far as i got, i'm struggling to import the msado15.dll file to my application. As i think i should as far as the examples go.

But at compile time i get a whole lot of errors because of msado15.dll
In which file should i actually import the dll?
And is it with the

#import "msado15.dll" rename("EOF", "adoEOF")
string?

Thanks in advance.

Re: Need some help with visual c++ and sql2000 ado connection

David Crow16-Jan-07 2:48

David Crow

16-Jan-07 2:48

XTr1NiTy wrote:
But at compile time i get a whole lot of errors...

Don't be stingy! Share those errors with us.

"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15

"Judge not by the eye but by the heart." - Native American Proverb

Re: Need some help with visual c++ and sql2000 ado connection

KarstenK16-Jan-07 2:55

KarstenK

16-Jan-07 2:55

You better include the (full) path, so the compiler finds the dll.

You better include the typical errors, often helps reading and understanding the error messages. Most the are right. Dead | X|

Greetings from Germany

Re: Need some help with visual c++ and sql2000 ado connection

XTr1NiTy16-Jan-07 3:04

XTr1NiTy

16-Jan-07 3:04

Thank for the quick reply guys Smile | :)

the errors are :
I will try the full path quickly maybe it will help D'Oh! | :doh:

--------------------Configuration: iDL_Scan - Win32 (WCE ARMV4I) Debug--------------------
Compiling resources...
Compiling...
StdAfx.cpp
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(409) : warning C4146: unary minus operator applied to unsigned type, result still unsigned
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(791) : error C2146: syntax error : missing ';' before identifier '_NewEnum'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(791) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1582) : error C2146: syntax error : missing ';' before identifier 'DataSource'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1582) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1582) : error C2501: 'DataSource' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1584) : error C2146: syntax error : missing ';' before identifier 'ActiveCommand'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1584) : error C2501: 'IDispatchPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1584) : error C2501: 'ActiveCommand' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1595) : error C2146: syntax error : missing ';' before identifier 'GetDataSource'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1595) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1601) : error C2146: syntax error : missing ';' before identifier 'GetActiveCommand'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1601) : error C2501: 'IDispatchPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1834) : error C2146: syntax error : missing ';' before identifier 'DataFormat'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1834) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1834) : error C2501: 'DataFormat' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1856) : error C2146: syntax error : missing ';' before identifier 'GetDataFormat'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(1856) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2488) : error C2146: syntax error : missing ';' before identifier 'DSO'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2488) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2488) : error C2501: 'DSO' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2490) : error C2146: syntax error : missing ';' before identifier 'Session'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2490) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2490) : error C2501: 'Session' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2496) : error C2146: syntax error : missing ';' before identifier 'GetDSO'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2496) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2497) : error C2146: syntax error : missing ';' before identifier 'GetSession'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2497) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2806) : error C2146: syntax error : missing ';' before identifier 'Row'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2806) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2806) : error C2501: 'Row' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2808) : error C2146: syntax error : missing ';' before identifier 'ParentRow'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2808) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2808) : error C2501: 'ParentRow' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2814) : error C2146: syntax error : missing ';' before identifier 'GetRow'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2814) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2840) : error C2146: syntax error : missing ';' before identifier 'Stream'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2840) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2840) : error C2208: 'struct ADODB::Stream' : no members defined using this type
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2846) : error C2146: syntax error : missing ';' before identifier 'GetStream'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2846) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2868) : error C2146: syntax error : missing ';' before identifier 'OLEDBCommand'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2868) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2868) : error C2501: 'OLEDBCommand' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2874) : error C2146: syntax error : missing ';' before identifier 'GetOLEDBCommand'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2874) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2905) : error C2146: syntax error : missing ';' before identifier 'Rowset'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2905) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2905) : error C2501: 'Rowset' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2909) : error C2146: syntax error : missing ';' before identifier 'RowPosition'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2909) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2909) : error C2501: 'RowPosition' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2915) : error C2146: syntax error : missing ';' before identifier 'GetRowset'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2915) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2921) : error C2146: syntax error : missing ';' before identifier 'GetRowPosition'
c:\myprojects\idl_scan\armv4idbg\msado15.tlh(2921) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tli(17) : error C2065: '_com_issue_errorex' : undeclared identifier
c:\myprojects\idl_scan\armv4idbg\msado15.tli(21) : error C2143: syntax error : missing ';' before 'tag::id'
c:\myprojects\idl_scan\armv4idbg\msado15.tli(21) : error C2433: 'IUnknownPtr' : 'inline' not permitted on data declarations
c:\myprojects\idl_scan\armv4idbg\msado15.tli(21) : error C2501: 'IUnknownPtr' : missing storage-class or type specifiers
c:\myprojects\idl_scan\armv4idbg\msado15.tli(21) : fatal error C1004: unexpected end of file found
Error executing clarm.exe.

iDL_Scan.exe - 60 error(s), 1 warning(s)

Re: Need some help with visual c++ and sql2000 ado connection

prasad_som16-Jan-07 3:07

prasad_som

16-Jan-07 3:07

I wonder, why you need to include .tlh.
Doesn't importing .tlb suffice.

Prasad
Notifier using ATL | Operator new[],delete[][^]

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