C / C++ / MFC Discussion Boards

McSam20-Mar-05 2:58

20-Mar-05 2:58

Thanks to Bob Moore and Kim Gräsman:

Go to: http://msdn.microsoft.com/newsgroups/default.aspx[^]

Wow, I did not expect the link to look like that! It is msdn Discussion group. Do a search on "Visual C++ 5.0 and XP SP2"

I hope that works.

Tracking mouse position in active view only

Joris van der Pol3-Jan-05 4:47

Joris van der Pol

3-Jan-05 4:47

Hey

At the moment i'm trying to create an image processing application using MFC (MDI, Doc/View). One of its features is displaying the (pixel) coordinates in the status bar. I managed to handle that by implementing OnMouseMove of the CView class and directly writing to the correct status bar pane, but currently it has 2 flaws. The first one is when the mouse moves out of the client area of the active view, the status bar reports the last updated position. The other is that when you pass the mouse over an inactive view it updates the coordinates for that inactive view. I want to clear the mouse position pane i have created in the status bar when the 2 events described above arise.
I should think this could be solved easily, but i haven't found a solid answer. Can anybody give me some pointers?

Thanks.

Re: Tracking mouse position in active view only

Maximilien3-Jan-05 6:39

Maximilien

3-Jan-05 6:39

have a look at _TrackMouseEvent.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Tracking mouse position in active view only

KaЯl4-Jan-05 3:09

KaЯl

4-Jan-05 3:09

For the second point, your view could update the status bar pane when it has the focus only, that is when (GetFocus() == this) (this being the view, of course).

Fold With Us!
"For every complex problem there is an answer that is clear, simple, and wrong" - H.L. Mencken

Re: Tracking mouse position in active view only

Joris van der Pol4-Jan-05 23:28

Joris van der Pol

4-Jan-05 23:28

Hey

Thanks for the reply. Checking the focus does work, i haven't looked at TrackMouseEvent yet.

greetings Joris

How to draw a graph in MFC?

ATC3-Jan-05 3:15

ATC

3-Jan-05 3:15

I have used VC++ MFC for a while but I have never used with Graph ... because I have never seen a toolbar Control which using Graph!

I think there is a way, anyone can show me briefly how to use it?

1. Which toolbar Control I should use?

2. Let say I would like to draw from x1,y1 to x2,y2 ... what draw I should use?

3. To represent a PIE chart or a PolyGraph, what should I use?

Many thanks

Re: How to draw a graph in MFC?

toxcct3-Jan-05 3:22

toxcct

3-Jan-05 3:22

I hope This[^] will help you...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Dynamically Show and Hide Title bar

mclpun3-Jan-05 2:58

mclpun

3-Jan-05 2:58

Hi All,

I' m writing a Visual C++ MFC dialog-based program. I tried to show and hide the title bar of a modal dialog dynamically but didn't succeed? Could anyone kindly helps me? Thanks!

Cheers,
Jack

Re: Dynamically Show and Hide Title bar

kdehairy3-Jan-05 4:21

kdehairy

3-Jan-05 4:21

Try using this member function of the dialog

<br />
//this will hide the title<br />
ModifyStyle(WS_CAPTION,0);<br />
//then call SetWindowPos() with cx and cy of your own<br />
::SetWindowPos(m_hWnd,HWND_TOP,0,0,cx,cy,SWP_SHOWWINDOW);<br />

to get it back:

<br />
//this will show the title<br />
ModifyStyle(0,WS_CAPTION);<br />
::SetWindowPos(m_hWnd,HWND_TOP,0,0,cx,cy,SWP_SHOWWINDOW);<br />

good luck my friend

k_dehairy

Re: Dynamically Show and Hide Title bar

mclpun3-Jan-05 15:42

mclpun

3-Jan-05 15:42

Thanks for your help, k_dehariy!

Meanwhile, how can I set the caption of the title bar dynamically?

Re: Dynamically Show and Hide Title bar

Rajesh match4-Jan-05 0:26

Rajesh match

4-Jan-05 0:26

SetWindowText

Streaming Audio in MFC, C#

Robert M Greene3-Jan-05 2:37

Robert M Greene

3-Jan-05 2:37

I would like to embed a simple streaming audio player similiar to LaunchCast Radio in an application. Where should I start? There are so many different types of methods that I am unsure of the cost/benefits of the different interfaces.

Can someone give me a breakdown of what I would do to start playing a stream from a site?

Languages would be C++/MFC for initial implementation, then later on a new client in C#.

.............................
There's nothing like the sound of incoming rifle and mortar rounds to cure the blues. No matter how down you are, you take an active and immediate interest in life.

Fiat justitia, et ruat cælum

Re: Streaming Audio in MFC, C#

Ravi Bhavnani3-Jan-05 7:24

Ravi Bhavnani

3-Jan-05 7:24

You should definitely check out Bass[^]. Cool | :cool:

(The site is currently temporarily unreachable, but keep trying).

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Non Blocking Read through anonymous pipes

pradish mathews3-Jan-05 2:01

pradish mathews

3-Jan-05 2:01

I have an application that uses anonymous pipes to communicate with the child process which is altogether a separate application. I was using anonymous pipes in this context but the problem is with the blocking read which leads to the GUI hang. I want to use the same anonymous pipe with Non-blocking read. In unix i was able to do this with select system call but in windows this API seems to be socket specific. Please help.

User DSN

Member 3600823-Jan-05 1:34

Member 360082

3-Jan-05 1:34

How do I create a DSN programmatically?

thanx

Re: User DSN

David Crow3-Jan-05 3:25

David Crow

3-Jan-05 3:25

Use SQLConfigDataSource().

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

How do i make a combo box non-editable

swarnamanoo3-Jan-05 1:06

swarnamanoo

3-Jan-05 1:06

How do i make a combo box non-editable

Re: How do i make a combo box non-editable

Cedric Moonen3-Jan-05 1:48

Cedric Moonen

3-Jan-05 1:48

Go into the properties of your combobox -> 'style' Tab and select 'DropList' in the 'Type' combo.

DJSplitter + Formview problem

Master^Tristar3-Jan-05 1:03

Master^Tristar

3-Jan-05 1:03

Hi all.
Got a little Problem...

I have 4 Views (CFormView) with a TreeCtrl in it..
now i moved the tree into a Splitterwindow (created by CChildFrame).

Wehn User selects a DataView from the Menu I call OpenDocumentFile() whitch
call's afer ObCreateClient() where I switch between the View's...

Question :
How I get Access from CLeftView to the CChildFrame to change the View (wndSplitter->CreateView() or call funtions whitch Show Data within the CFormView ??

Thx. for Help !!!

Re: DJSplitter + Formview problem

Master^Tristar4-Jan-05 0:55

Master^Tristar

4-Jan-05 0:55

Got it by myself after spending hours... Dead | X|

Hier the code I used to get rid of it.... hope it helps someone... Roll eyes | :rolleyes:

BOOL CChildFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/, CCreateContext* pContext)
{
// Unterteiltes Fenster erstellen
if (!m_wndSplitter.CreateStatic(this, 1, 2))
return FALSE;

// create a new left pane !!
if (!m_wndSplitter.CreateView(0, 0, RUNTIME_CLASS(CLeftView), CSize(200, 200), pContext))
{
AfxMessageBox("Failed to create Client Frame Window!");
m_wndSplitter.DestroyWindow();
return FALSE;
}

CString m_Classname = pContext->m_pNewViewClass->m_lpszClassName;
// AfxMessageBox(m_Classname);

// selct the view
if (m_Classname == "CFrmAdressen")
{
// AfxMessageBox("Class ist CFrmAdressen");
if (!m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CFrmAdressen), CSize(200, 200), pContext))
{
m_wndSplitter.DestroyWindow();
return FALSE;
}
return TRUE;
}
if (m_Classname == "CFrmArtikel")
{
if (!m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CFrmArtikel), CSize(200, 200), pContext))
{
m_wndSplitter.DestroyWindow();
return FALSE;
}
return TRUE;
}
if (m_Classname == "CFrmAuftrag")
{
if (!m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CFrmAuftrag), CSize(200, 200), pContext))
{
m_wndSplitter.DestroyWindow();
return FALSE;
}
return TRUE;
}

if (m_Classname == "CFrmInfoBox")
{
if (!m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CFrmInfoBox), CSize(200, 200), pContext))
{
m_wndSplitter.DestroyWindow();
return FALSE;
}
return TRUE;
}
}

Leftview Treehandling :

void CLeftView::OnTvnSelchanged(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMTREEVIEW pNMTreeView = reinterpret_cast<lpnmtreeview>(pNMHDR);

CChildFrame *m_Child = ((CChildFrame*)GetParentFrame()->GetActiveFrame());
CWnd *p_Wnd = m_Child->m_wndSplitter.GetPane(0,1);
if (m_Child->GetRuntimeClass() == RUNTIME_CLASS(CFrmInfoBox))
{
CFrmInfoBox* m_Info = DYNAMIC_DOWNCAST(CFrmInfoBox, p_Wnd);
m_Info->OnTvnSelchangedTree1(pNMHDR, pResult);
}
}
*pResult = 0;
}

So I can Display and change view as before... but without using Tree in the FormView...

After I just a add a function to update the tree as I need...

C'ya

c++ library runtime error

X20403-Jan-05 0:34

X2040

3-Jan-05 0:34

i have made a program using VC++ 7.0 MFC
and i included in my package all the MFC Dlls
and this program is running under windows XP
but when i try to open it from windows 98
a message error occurs telling me that

"C++ library runtime error"

does any one know how to solve this problem

Re: c++ library runtime error

ThatsAlok3-Jan-05 0:42

ThatsAlok

3-Jan-05 0:42

Problem is that you have created DLL that Support MFC70.dll and Win98 support till MFC42.dll.

this only cauing teh Problem,only solution is to compile the library on 98 platefrom

"I Think this Will Help"
Alok Gupta
visit me at http://www.thisisalok.tk

Need help with Callback in DLL

RedDragon2k2-Jan-05 23:10

RedDragon2k

2-Jan-05 23:10

Hi everyone

i'm working on a DLL with 2 Callback Functions but i really have no clue why it isn't working:

//MainClass.h (It's the DLL)

typedef void (__stdcall *LP_CREATEHANDLER_FUNC)(HANDLE, CString);
typedef void (__stdcall *LP_TERMINATEHANDLER_FUNC)(HANDLE);

class CMainClass
{
public:
__declspec(dllexport) void SetCreateHandler(LP_CREATEHANDLER_FUNC p_Handler);
__declspec(dllexport) void SetTerminateHandler(LP_TERMINATEHANDLER_FUNC p_Handler);
};

//ClientDlg.cpp TheMainApp

BOOL CClientDlg::OnInitDialog()
{
CDialog::OnInitDialog();
...
m_cls.SetCreateHandler(CreateHandler);
m_cls.SetTerminateHandler(TerminateHandler);
}

void __stdcall CClientDlg::CreateHandler(HANDLE hPID, CString strFilename)
{
}

void __stdcall CClientDlg::TerminateHandler(HANDLE hPID)
{
}

I get the following error:
error C2664: 'CMainClass::SetCreateHandler' : cannot convert parameter 1 from 'void (HANDLE,CString)' to 'LP_CREATEHANDLER_FUNC'
error C2664: 'CMainClass::SetTerminateHandler' : cannot convert parameter 1 from 'void (HANDLE)' to 'LP_TERMINATEHANDLER_FUNC'

what am i doing wrong ?

MFG
RedDragon2kx

Unix and C are the ultimate computer viruses.

Re: Need help with Callback in DLL

C^hris L^osinger3-Jan-05 4:04

C^hris L^osinger

3-Jan-05 4:04

you can't reference a non-static class member function via a function pointer.

Software | Cleek

Re: Need help with Callback in DLL

Neville Franks3-Jan-05 8:37

Neville Franks

3-Jan-05 8:37

Chris Losinger wrote:
you can't reference a non-static class member function via a function pointer.

unless you use something like FastDelegate: http://www.codeproject.com/cpp/FastDelegate.asp[^] Boost also has libraries which can do this, but FastDelegate is simpler and works incredibly well.

Neville Franks, Author of ED for Windows www.getsoft.com and Surfulater www.surfulater.com "Save what you Surf"

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.