Re: VC++ 2003 .NET - C / C++ / MFC Discussion Boards

Accessing and displaying data of worker thread function

Member 153706925-Mar-05 11:11

25-Mar-05 11:11

Hi,

I'm working on a GUI interface that has worker theads. I want to be able to access data generated from the worker thread and display it on the GUI in real time. Right now, i'm able to access the data but I'm not able to display it until the thread finishes. Is there a way to access the data and display it in real time while the thread is running?

Thanks

Lien

Re: Accessing and displaying data of worker thread function

Paul M Watt25-Mar-05 12:59

Paul M Watt

25-Mar-05 12:59

What is preventing you from displaying it until after the worker thread has finished?

Is your UI thread waiting for the worker thread to finish? Are you storing your data on the worker thread in buffers that are accessible to the UI thread? What kind of data do you have, and how are you trying to display it on the UI?

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Re: Accessing and displaying data of worker thread function

PJ Arends25-Mar-05 13:04

PJ Arends

25-Mar-05 13:04

Two ideas:
1- Have your worker thread post user messages to your GUI thread informing it about the current status.

2- Use a data structure that your worker thread and GUI thread both have access to. Be careful about data access synchronisation when using this approach.

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Saving Bitmap From Clipboard to file

ww303125-Mar-05 8:18

ww3031

25-Mar-05 8:18

Hi.. anyone help with some info to save a bitmap from the clipboard into a bitmap file?

Re: Saving Bitmap From Clipboard to file

David Crow25-Mar-05 9:21

David Crow

25-Mar-05 9:21

if (OpenClipboard(NULL) != FALSE)
{
    HBITMAP hBitmap = GetClipboardData(CF_BITMAP);
    if (NULL != hBitmap)
    {
        // see <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/bitmaps_7zfp.asp" rel="nofollow">here</a>
    }

    CloseClipboard();
}

[edit]
I just tried this and it works fine.
[/edit]

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Saving Bitmap From Clipboard to file

ww303125-Mar-05 11:01

ww3031

25-Mar-05 11:01

Thanks

VC++ 2003 .NET

victorsk25-Mar-05 7:27

victorsk

25-Mar-05 7:27

Hello,

I am thinking of getting either a VC++ 2003 .NET or VC++ 6. I have to write an FTP application that would work on the internet. I will very much appreciate if somebody could tell me what would be the best platform for this application: VC++ 2003 .NET or VC++ 6? And, if it is VC++ 2003, could somebody please tell me how adding handlers works in this platform?

Thank you,
Victor.

Re: VC++ 2003 .NET

Kevin McFarlane25-Mar-05 10:16

Kevin McFarlane

25-Mar-05 10:16

You may as well get the more up-to-date version. VC++ 2003 will do everything that VC++ 6 does plus more.

If you intend to use MFC then you should be aware that ClassWizard is no longer present but the online help explains how to add event handlers. Many think that the new way is less usable than the old way but, nevertheless, the functionality and features of the framework, as opposed to the IDE, are richer.

Kevin

Re: VC++ 2003 .NET

victorsk25-Mar-05 11:00

victorsk

25-Mar-05 11:00

Hi Kevin,

Thank you very much for the reply. I think I will get VC++ 2003.

Victor.

Re: VC++ 2003 .NET

Kevin McFarlane25-Mar-05 11:08

Kevin McFarlane

25-Mar-05 11:08

You might want to investigate the differences between the Standard and Professional editions though. You can get the Standard Edition by itself. But for the Professional Edition, you have to purchase the entire Visual Studio 2003 (or use the free command line compiler with no IDE! Cry | :((

). I don't know whether this is an issue for you or not. I'm not entirely sure what you lose if you just get VC++ 2003 Standard but I'm sure there must be a feature matrix somewhere.

Kevin

Re: VC++ 2003 .NET

MMansonFan2529-Mar-05 23:19

MMansonFan25

29-Mar-05 23:19

I believe the major difference is that the professional version is able to perform more code optimizations than standard. I personally have had no problem with the standard version.

UDP datagram, Pls help

Kimdave25-Mar-05 6:46

Kimdave

25-Mar-05 6:46

Dear All, does anyone have UDP socket sample code to able to send and receive UDP? or anyone can explain how to:-

a) Write and send a programme to send a single datagram.
b) A program to receive the datagram sent by the program (a above)
c) A program to wait for the reply from b above (question b)
d) A way of timing how long it takes for a datagram to get from the first program to the second and back again, i.e measuring the RTTs of a datagram.

Thank you for looking into this.

Regards.

Kim

AfxBeginThread() ???

Static(x)25-Mar-05 6:25

Static(x)

25-Mar-05 6:25

Hi i want to write a simple thread , that will work in the background and i'll be able to do other things in my program until the thread is in progress,i do the following but get an error.

UINT CtestDlg::MyThreadProc(LPVOID pParam)//create thread
{
for(int i=0;i<10000;i++)
for(int j=0;j<10000;j++) {};

MessageBox("Finished");
return 0;
}

then call it : AfxBeginThread(MyThreadProc,0);
but i get an error :

c:\...\ : error C2665: 'AfxBeginThread' : none of the 2 overloads can convert parameter 1 from type 'UINT (LPVOID)'

Can anyone help ?

Regards

Giorgi Moniava

Re: AfxBeginThread() ???

Michael Dunn25-Mar-05 6:45

Michael Dunn

25-Mar-05 6:45

See the FAQ
6.1 Why can't I use a member function as a callback?[^]

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Re: AfxBeginThread() ???

Greg Rodgers25-Mar-05 8:00

Greg Rodgers

25-Mar-05 8:00

use:

AfxBeginThread(&MyThreadProc, (LPVOID)this, THREAD_PRIORITY_NORMAL);

inside MyThreadProc you can add the code:

CtestDlg *pTestDlg = (CtestDlg *)pParam;

... this will allow you to access any CtestDlg members.

Re: AfxBeginThread() ???

ddmcr25-Mar-05 10:32

ddmcr

25-Mar-05 10:32

Thanks Greg for you attention , but when i type :

AfxBeginThread(&MyThreadProc,(LPVOID)this,0);

i get an error :

c:\..\: error C2276: '&' : illegal operation on bound member function expression

Regards

m0n0

Re: AfxBeginThread() ???

Anthony_Yio25-Mar-05 18:41

Anthony_Yio

25-Mar-05 18:41

Your MyThreadProc need to be static.
And you only need to call like

AfxBeginThread(MyThreadProc,(LPVOID)this,0);

E.g

CWinThread* pThread = AfxBeginThread (ThreadFunc, lpVoid, THREAD_PRIORITY_NORMAL, 0, CREATE_SUSPENDED);
ASSERT (NULL != pThread);
pThread->m_bAutoDelete = FALSE;
pThread->ResumeThread ();

By the way, make sure you protect the variables that you are accessing in the 'this ' in the thread by using those synchronization classes like CMutex, Interlock functions and etc.

Sonork 100.41263:Anthony_Yio

NT permissions

RobJones25-Mar-05 6:03

RobJones

25-Mar-05 6:03

Hello, just wondering if anyone has tried to backup NT permissions of a file or directory and store it in a flat file so the permissions could be restored at a later date if needed?

Is this even possible? If anyone has any experience in this can you give me a pointer where to start?

Thanks

Whoever said nothing's impossible never tried slamming a revolving door!

Re: NT permissions

David Crow25-Mar-05 7:29

David Crow

25-Mar-05 7:29

To store:

CFileStatus stat;
CFile::GetStatus("file", stat);
CFile file("attr.out", CFile::modeWrite);
file.Write(&(stat.rStatus), sizeof(stat.rStatus));
file.Close();

To load:

CFileStatus stat;
CFile file("attr.out", CFile::modeRead);
file.Read(&(stat.rStatus), sizeof(stat.rStatus));
file.Close();
CFile::SetStatus("file", stat);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Serialization

Gagnon Claude25-Mar-05 5:48

Gagnon Claude

25-Mar-05 5:48

Hi,

I utilize the IMPLEMENT_SERIAL(CFondationDoc, CDocument, VERSIONABLE_SCHEMA | 1) macro in my document class. I want to distinct between two versions of my files.

I have put "int nVersion = ar.GetObjectSchema();" in the loading portion of the Serialize method.

But nVersion returns always -1.

Do I have to store the schema number in the file ?
I have tried with "ar.SetObjectSchema(1);", but it is not stored in the file.

Thanks,

Claude

Re: Serialization

Blake Miller25-Mar-05 6:24

Blake Miller

25-Mar-05 6:24

I usually just write out a DWORD at beginning of serialization stream as my 'version' number and read that back in when deserializing. It beats trying to figure out the screwy Schema system they have. You can read in older files with newer code, presumably the new system will always write out the newer file, though that is not stricly necessary either. Then just increment the DWORD value when you have a newer version of your data.

Re: Serialization

Ravi Bhavnani26-Mar-05 3:10

Ravi Bhavnani

26-Mar-05 3:10

This[^] article may help.

/ravi

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Adding a C++ Inline File to a Visual C++.Net Project

JSadleir25-Mar-05 3:17

JSadleir

25-Mar-05 3:17

Hi All

This is a very basic question but in Visual C++.Net, how do I add a C++ Inline File like XLCALL32.LIB? I am trying to build an XLL from a DLL following the instructions in MSDN article Q178474. That article at point 6 says "Click Settings on the Project Menu. Click the Link tab and add XLCALL32.LIB to the Object/Library." The only way I can add it is to go to File and then "Add existing item" and then change the file type to *.* and select the inline file XLCALL32.LIB from the directory. This does not seem to work properly to link the file to the rest of the project. It may ne that something else is the cause and I am adding the inline file correctly.

Any thoughts would be much appreciated.

Regards

Jeremy

Re: Adding a C++ Inline File to a Visual C++.Net Project

Gary R. Wheeler25-Mar-05 3:47

Gary R. Wheeler

25-Mar-05 3:47

XLCALL32.lib is an object library, not an 'inline file'. An object library is a collection of object modules, compiled previously.

From the Project menu, select Properties. In the dialog, select Linker and then Input. Add XLCALL32.lib to the Additional dependencies field.

Software Zen: delete this;

Unicode sizeof(TCHAR) == 1???

Dave_25-Mar-05 3:01

Dave_

25-Mar-05 3:01

I am building a dll that is supposed to be using Unicode but I am having some problems. I won't go into a lot of detail but here's a quick summary -

I am using grid software that requires a CString to be passed into it's SetText() function. I have a structure that has the follwing member:

struct MYSTRUCT{
TCHAR szDescription[512];
};

So, when I reach the point where I need to set my grid text, I use the following:
CString szTxt(struct.szDescription);

It fails indside the CString code in AllocBuffer() where it is actually doing the "new" call.

I don't expect anyone to know how to solve this but one thing that jumps out at me is that when I type sizeof(TCHAR) into my watch window, it returns a value of 1. I was expecting 2. I have "UNICODE" and "_UNICODE" defined in the project settings.

Any idea?

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