Does any one have an idea about streaming RTP - C / C++ / MFC Discussion Boards

George_George24-Jun-08 2:11

24-Jun-08 2:11

Hello everyone,

I want to develop an automatic tool or manually using existing tool (e.g. WinDbg) to watch when CoInitialize/CoUninitialize is called. I suspect CoUninitialize is not called the same times as CoInitialize, and I want to get the call stack.

Any ideas or reference documents about how to do this?

(I do not have the full source codes, but I have symbol files. My current ideas is either to add to system level COM Runtime hook to monitor when the two functions are called and get stack trace if possible, or using WinDbg to monitor the two specific function calls -- but I do not know the command in WinDbg. Smile | :)

)

thanks in advance,
George

Re: CoInitialize/CoUninitialize

Randor 24-Jun-08 3:32

Randor

24-Jun-08 3:32

bp ole32!CoInitializeEx "~.;k"
bp ole32!CoUninitialize "~.;k"

Best Wishes,
-David Delaune

Re: CoInitialize/CoUninitialize

George_George24-Jun-08 22:21

George_George

24-Jun-08 22:21

Thanks David!

Two more comments,

1.

Previously I always use bm other than bp to set a break point. What are the differences between bp and bm?

2.

"~.;k" means?

regards,
George

Getting problem with ADO database connection for Excel

trinadh_t24-Jun-08 2:07

trinadh_t

24-Jun-08 2:07

Hi,

I am getting problem in retrieving tables from Excel 8.0. For some Excel files it is working fine. But some files it is giving dupicate fine names with garbage values.
like :
'Const#Liens-Book#Page$'
'Const#Liens-Book#Page$'_
'Const#Liens-Book#Page$'Z_1590EFBF_96D2_4D24_A4C9_842D6034FE78_#
'Const#Liens-Book#Page$'Z_3AFA2892_C4CC_49E4_9288_7102C55DF3DE_#
'Const#Liens-Book#Page$'Z_7609B60E_2B6C_4DBB_8D3C_4D38EC883EBD_#'Const"

It should retrieve 'Const#Liens-Book#Page$' only but its giving this many table names and giving error message like "object or provider is not capable of performing requested operation"

I have written code in VC++. Is there any seetings i need to do for excel file.

I am placing the code below :

CoInitialize(NULL);
ADO::_ConnectionPtr g_Connection;
g_Connection.CreateInstance( __uuidof(ADO::Connection) );

strConnection.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:\\test.xls;Extended Properties=Excel 8.0;");
g_Connection->Open( (LPCSTR)strConnection, "", "", ADO::adConnectUnspecified );

ADO::_RecordsetPtr recordset = g_Connection->OpenSchema( ADO::adSchemaTables );
CString strTableList;
while ( ! recordset->EndOfFile )
{
CString strTable = (LPCSTR)_bstr_t( recordset->Fields->GetItem( "TABLE_NAME" )->Value );
strTableList += strTable + "\n";
recordset->MoveNext();
}
AfxMessageBox( strTableList );
CString strColumnList;

recordset = g_Connection->OpenSchema( ADO::adSchemaColumns );
while ( ! recordset->EndOfFile )
{
CString strColumn = (LPCSTR)_bstr_t( recordset->Fields->GetItem( "COLUMN_NAME" )->Value );
strColumnList += strColumn;
recordset->MoveNext();
}
AfxMessageBox( strColumnList );

CoUninitialize();

Please help me for this issue. I am waiting for your reply.

Regards
Trinadh

finding os of a particular system

VCProgrammer24-Jun-08 2:02

VCProgrammer

24-Jun-08 2:02

Hi all,

I want to put a OS check in my program by os check i meant that if i am working on xp then particular work is to be done and if i am working on vista then particular work is to be done.....

How can i differentiate between both the os???

Thanks in advance

Re: finding os of a particular system

Nibu babu thomas24-Jun-08 2:16

Nibu babu thomas

24-Jun-08 2:16

VCProgrammer wrote:
I want to put a OS check in my program by os check i meant that if i am working on xp then particular work is to be done and if i am working on vista then particular work is to be done.....

This should help -> GetVersionEx[^]

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: finding os of a particular system

CPallini24-Jun-08 2:22

CPallini

24-Jun-08 2:22

Does this [^] help?

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Does any one have an idea about streaming RTP

yaminisridaran24-Jun-08 0:21

yaminisridaran

24-Jun-08 0:21

I am trying to develop a RTP Player in vc++.I downloaded vlc open source but compiled in cygwin and able to get exe but I too convert that code to vc++6.0. Can any one suggest me regrading the rtp player

Re: Does any one have an idea about streaming RTP

Mark Salsbery24-Jun-08 4:51

Mark Salsbery

24-Jun-08 4:51

yaminisridaran wrote:
I am trying to develop a RTP Player in vc++.I downloaded vlc open source

Are you trying to develop an RTP player or download and use a third=party one?

yaminisridaran wrote:
Does any one have an idea about streaming RTP

No - the RTP protocol is secret[^]

Re: Does any one have an idea about streaming RTP

yaminisridaran24-Jun-08 18:33

yaminisridaran

24-Jun-08 18:33

Yes I am tryiing to develop a rtp player

WM_NEXTDLGCTL one control too far

baerten24-Jun-08 0:05

baerten

24-Jun-08 0:05

Hi everybody,

i perform a PostMessage(WM_NEXTDLGCTL); and the focus is not set on the next
control but is set on the second next control.

Is there a special thing to know?

Big thanks

Re: WM_NEXTDLGCTL one control too far [modified]

_AnsHUMAN_ 24-Jun-08 0:08

_AnsHUMAN_

24-Jun-08 0:08

do you set the "tab stop" property to true for that control.
Note: If the next control is a list control and you are trying to do a TAB for setting the focus on that control that list SHOULD contain atleast one item before it shows that it gained focus
modified:The tab order for your window can be changed by pressing ctrl+d in resource view(ie design time)

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

modified on Tuesday, June 24, 2008 6:14 AM

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 0:15

baerten

24-Jun-08 0:15

Thansk for your answer

The next control is a DatePickerWnd.
All controls have "TabStop" to TRUE.

If i press the TAB-Key on the control, then the focus steps on the (correct) next control.
But via WM_NEXTDLGCTL it steps 2 controls farer.
If i remove the WM_NEXTDLGCTL, the focus stays on the initial control.
And 2 WM_NEXTDLGCTL sets the focus indeed 4 controls farer D'Oh! | :doh:

Re: WM_NEXTDLGCTL one control too far

Rajesh R Subramanian24-Jun-08 0:12

Rajesh R Subramanian

24-Jun-08 0:12

Probably that's how you've set up the "Tab Order" in design time?

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 0:20

baerten

24-Jun-08 0:20

The Tab-Order is correct at designtime and during the execution of the application.
Pressing the Tab-Key navigates me correctly trough the view ...

thanks for help Wink | ;)

Re: WM_NEXTDLGCTL one control too far

Rajesh R Subramanian24-Jun-08 0:26

Rajesh R Subramanian

24-Jun-08 0:26

Did you read the fine print on the MSDN page[^]? (The parameters - wParam, lParam and the Remarks section)

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 0:54

baerten

24-Jun-08 0:54

Yes, but i doesn't work for me Sigh | :sigh:

A PostMessage(WM_KEYDOWN,(WPARAM)VK_TAB); sets the focus to the previous control
but with silly sideeffects (insertion bar is still in the initial textbox and the new taped characters are inserted in the new textbox D'Oh! | :doh:

)

Thanks anyway Smile | :)

Re: WM_NEXTDLGCTL one control too far

Rajesh R Subramanian24-Jun-08 1:08

Rajesh R Subramanian

24-Jun-08 1:08

baerten wrote:
A PostMessage(WM_KEYDOWN,(WPARAM)VK_TAB); sets the focus to the previous control

You told me that you read the documentation:

If wParam is zero, the next control receives the focus; otherwise, the previous control with the WS_TABSTOP style receives the focus.

Nobody can give you wiser advice than yourself. - Cicero
.·´¯`·->Rajesh<-·´¯`·.
Codeproject.com: Visual C++ MVP

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 1:23

baerten

24-Jun-08 1:23

Rajesh R Subramanian wrote:
baerten wrote:
A PostMessage(WM_KEYDOWN,(WPARAM)VK_TAB); sets the focus to the previous control

You told me that you read the documentation:

If wParam is zero, the next control receives the focus; otherwise, the previous control with the WS_TABSTOP style receives the focus.

That was just for testing (in this case i use a WM_KEYDOWN and not a WM_NEXTDLGCTL Smile | :)

)

Re: WM_NEXTDLGCTL one control too far

Nibu babu thomas24-Jun-08 0:21

Nibu babu thomas

24-Jun-08 0:21

baerten wrote:
is not set on the next
control but is set on the second next control.

Try GetNextDlgTabItem(PrevWnd)->SetFocus().

BTW read the docs carefully on WM_NEXTDLGCTL. It has some detail associated with it.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

Re: WM_NEXTDLGCTL one control too far

baerten24-Jun-08 0:50

baerten

24-Jun-08 0:50

Yes, i already read the MSDN-Documentation.

I don't have a handle to the next control.
I call the WM_NEXTDLGCTL in a universal function, which sets only
the focus on the next control, wherever the control is placed.

In my case:

I hit the F2-Key on a certain textbox. A Dialog opens modal and shows a Grid.
The user selects a line and the Dialog places a string into the textbox (where the user hit's the F2-Key)
Then i post the WM_NEXTDLGCTL Message so that the next textbox is selected.

Thanks

Re: WM_NEXTDLGCTL one control too far [modified]

Nibu babu thomas24-Jun-08 1:36

Nibu babu thomas

24-Jun-08 1:36

baerten wrote:
WM_NEXTDLGCTL in a universal function, which sets only
the focus on the next control, wherever the control is placed.

Well for testing purpose, I put this event call in a timer

void OnTimer( UINT Id )
{
  PostMessage( WM_NEXTDLGCTL, FALSE, FALSE );
}

Works well for me, focus shifts properly around all controls in the dialog. Then I put it in a button event handler, after this the focus always moved to the Cancel button, guess why? Smile | :)

So you need to watch out for such issues.

A wild guess! Are you posting WM_NEXTDLGCTL twice, since it's a post message you wouldn't know, a suggestion would be replace PostMessage with SendMessage(MSDN says don't) for testing purpose to find out where if at all a duplicate one is being posted, since it blocks. Don't forget to revert back to PostMessage.

Nibu babu thomas
Microsoft MVP for VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http://nibuthomas.wordpress.com

modified on Tuesday, June 24, 2008 8:00 AM

Draw on screen outside application window

garyofcourse23-Jun-08 23:19

garyofcourse

23-Jun-08 23:19

Hi. I am programming c++ with MFC on VS2005. I was wondering how you can make your application draw outside its own window.

There are softwares out there that allow a user to scribble anything on the computer screen over any applications that are running or the desktop. A couple of them are
ActivePen (http://www.kongda.com/products/activepen/default.asp),
VBDoodle (http://www.hopkinsprogramming.net/software/vbdoodle/gallery/)
Draw-On-Screen (http://downloads.zdnet.com/abstract.aspx?docid=352162)

My question is how would I replicate this behavior? Im new to visual c++, and although i have experimented with making my own version of paint, I was only able to draw inside the screen of my MFC application which was made using Edit view class as base class. Did not see any way to draw just anywhere on the screen outside the window.

It would be great if you could maybe name a few built in classes/methods that can do this, or provide me with a link to a known resource on this topic. Thank you.

Re: Draw on screen outside application window

Naveen23-Jun-08 23:43

Naveen

23-Jun-08 23:43

If you are using MFC, you can use CWindowDC dc(0); to get a device conext to entire screen. Other wise use GetDC(0) to get the dc to entire screen.

Any drawing to the above dc's will come in screen at the specified locations.

nave

[OpenedFileFinder]

Re: Draw on screen outside application window

_AnsHUMAN_ 24-Jun-08 0:04

_AnsHUMAN_

24-Jun-08 0:04

On similar lines as the answer you received above you can get a dc for the desktop window HWND. The desktop window hwnd can be obtained by GetDesktopWindow API

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

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