C / C++ / MFC Discussion Boards

Speedy1-Jul-02 12:47

1-Jul-02 12:47

i want to open the My Computer's "Properties" dialog and then select "Hardware" tab on button press event of my application.
anyone knows??? Confused | :confused:

Re: calling system dialogs .......

1-Jul-02 15:18

Try:

PROCESS_INFORMATION pi;
STARTUPINFO si;
memset((void *)&si, 0, sizeof(STARTUPINFO));
memset((void *)&pi, 0, sizeof(PROCESS_INFORMATION));
si.cb = sizeof(STARTUPINFO);
TCHAR szCommandLine[]=TEXT("rundll32.exe shell32.dll,Control_RunDLL Sysdm.cpl @2");
BOOL bFlag = ::CreateProcess(
NULL,
szCommandLine,
NULL,
NULL,
FALSE,
NORMAL_PRIORITY_CLASS,
NULL,
NULL,
&si,
&pi);

Cheers

Re: calling system dialogs .......

1-Jul-02 15:54

I'm sorry.
The command line should be
TCHAR szCommandLine[]=TEXT("rundll32.exe shell32.dll,Control_RunDLL Sysdm.cpl,,2");

Thank You .

Speedy2-Jul-02 9:50

Speedy

2-Jul-02 9:50

Thanks alot for solving my problem.it really work fine.(can u tell me its portion where "Hardware tab" is selected)? Roll eyes | :rolleyes:

Re: Thank You .

3-Jul-02 16:50

TCHAR szCommandLine[]=TEXT("rundll32.exe shell32.dll,Control_RunDLL Sysdm.cpl,,2");
just in ",,2"
",,2" means you want to select the 3rd tab,it is 0 based
Cheers

STL question.

User 98851-Jul-02 11:32

User 9885

1-Jul-02 11:32

// get data from wherever
unsigned char* buf = get_datafromserver();
vector<unsigned char> vbuffer;

// i want to copy the data from the buffer into the vector here
What is the most efficient way to do this?

Thank you

Thomas

modified 29-Aug-18 21:01pm.

Re: STL question.

Stuart Dootson1-Jul-02 13:15

Stuart Dootson

1-Jul-02 13:15

if you know the length of the data in buf (lets call it bufLen, for arguments sake):

vbuffer.reserve(bufLen);
std::copy(buf, buf + bufLen, std::back_inserter(vbuffer));

Stuart Dootson

'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'

Re: STL question.

Joaquín M López Muñoz1-Jul-02 19:50

Joaquín M López Muñoz

1-Jul-02 19:50

I strongly doubt this is the most efficient way to do the copying, since the back inserter must check for overflow every time it is incremented (altough overflow won't happen, but this is something you and me know, not the program.) A speedier way is as follows:

vbuffer.resize(bufLen);
memcpy(&vbuffer[0],buf,bufLen);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: STL question.

User 98852-Jul-02 2:57

User 9885

2-Jul-02 2:57

Thank you. sounds great

Thomas

modified 29-Aug-18 21:01pm.

Re: STL question.

Christian Graus1-Jul-02 13:16

Christian Graus

1-Jul-02 13:16

You want to turn the string into a vector of chars ? Why not use std::string instead ? It's true vector<char> is sometimes a better choice, I'm just curious if you're aware that std::string is an option, and you get the constructor for free.

Otherwise, I'd guess you need to step through buf, calling push_back for each char. As someone else has pointed out, std::copy will do this for you, but it's no more efficient than doing it yourself ( efficiency being what you asked for ). It's obviously neater tho.

Christian

I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002

I have given you two days - please could you let me have the details of your attorney and pastor. - Alex - 01/06/2002

Re: STL question.

User 98852-Jul-02 2:57

User 9885

2-Jul-02 2:57

The buffer can have null values Frown | :(

. It is a binary stream that is read as a BYTE buffer. vector is easier to manipulate.

Thomas

modified 29-Aug-18 21:01pm.

Re: STL question.

jbarton2-Jul-02 4:05

jbarton

2-Jul-02 4:05

You may want to use the vector member routine insert to put the data into the vector. This is at least as efficient as using std::copy, and can be more efficient.

To insert the elements into the vector (assuming that there are count elements):

vbuffer.insert( vbuffer.end(), buf, buf+count );

Using memcpy to do the copy after reserving the space will work, and may be faster, but I generally stay away from memcpy in C++ programs. It won't break anything when used with an unsigned char, but if you ever change what you are storing in the vector to a non-trivial data type, it could break.

Using insert also has the advantage of only needing a single call to do all the work.

You may want to get the book "Effective STL" by Scott Meyers. I have found this book to be very useful at learning better ways to use STL.

Best regards,
John

Re: STL question.

Stuart Dootson2-Jul-02 10:01

Stuart Dootson

2-Jul-02 10:01

Efficiency - ooh, what a palaver. I did some timing tests on a 10 Mbyte sample and found (machine = 733MHz PIII, Windows 2000):

memcpy - 12nanoseconds/byte
std::copy with a vector output_iterator (see below) - 15nanoseconds/byte
explicit loop using vector operator[] - 18 nanoseconds/byte
std::copy with a vector insert_iterator (see below) - 27nanoseconds/byte

Given the closeness of the timings, I'd take the std::copy over memcpy anytime, as (IMHO) it's more correct when populating a vector...anyway, thats just my opinion, so hey, whatever.

(sample code for vector output_iterator:

unsigned char* buffer;
std::vector<unsigned chat> v;
v.resize(whatever the required size is);
std::copy(buffer, buffer + whatever the required size is, v);

Stuart Dootson

'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'

8.3 file format

Atlence1-Jul-02 11:13

Atlence

1-Jul-02 11:13

How can I get the 8.3 format of a long filename ?

Thks in advance!
Appstmd

Re: 8.3 file format

Jason Henderson1-Jul-02 11:20

Jason Henderson

1-Jul-02 11:20

GetShortPathName API function

Jason Henderson
_{quasi-homepage}
^articles
_{"Like it or not, I'm right!"}

get the cursor coord in a CListCtrl

Fred D.1-Jul-02 11:01

Fred D.

1-Jul-02 11:01

hi all,

could anybody give a hint on how to retrieve the cursor coordinate (CPoint) in a CListCtrl ? prog. running on Win CE 3.0

i want to display a pop-up menu where the user click somewhere in the List, to do so i need to get the cursor coord.

i've triied :

void C..::OnLButtonUp(UINT nFlags, CPoint point) // it only works in the View, not inside the control Frown | :(

void C..::OnClickList1(NMHDR* pNMHDR, LRESULT* pResult) //here there is no direct way to get the position..

any idea ?
thanx

Fred

Re: get the cursor coord in a CListCtrl

Steve L.1-Jul-02 14:48

Steve L.

1-Jul-02 14:48

Put this in your OnClickList or what ever its called.

CPoint point;
GetCursorPos( &point ); 
m_listCtrl.ScreenToClient( &point );

Then display your pop-up menu at point

-Raffi

Re: get the cursor coord in a CListCtrl

Steve L.1-Jul-02 14:53

Steve L.

1-Jul-02 14:53

Oops, just realize that you dont have to put the ScreenToClient part in there.
I should be:

CPoint point;
GetCursorPos( &point );

And display your pop-up menu at point.

-Raffi

Re: get the cursor coord in a CListCtrl

1-Jul-02 15:40

Try:

NM_LISTVIEW *plv = ( NM_LISTVIEW * )pNMHDR;
UINT uflag ;
m_wndListCtrl.HitTest( plv->ptAction , &uflag );
if( uflag == LVHT_ONITEMICON )
....

Here plv->ptAction is the cursor coordinate and you don't need to use
ScreentToClient()

Cheers

Re: get the cursor coord in a CListCtrl

Fred D.1-Jul-02 22:39

Fred D.

1-Jul-02 22:39

thanx guys !

just a simple GetCursorPos() do it ! Smile | :)

@+
Fred

how to sense nuber pressed by caller in TAPI 3.0

Speedy1-Jul-02 10:32

Speedy

1-Jul-02 10:32

I want to know how can i sense number pressed by caller using tapi 3.0 in VC.

Re: how to sense nuber pressed by caller in TAPI 3.0

Michael P Butler1-Jul-02 11:03

Michael P Butler

1-Jul-02 11:03

Have a look at ITDigitDetectionEvent in MSDN or on the platform SDK.

Michael Smile | :)

Logic, my dear Zoe, merely enables one to be wrong with authority. - The Doctor

CToolbar problems in Win98 2nd Edition?

dazinith1-Jul-02 10:29

dazinith

1-Jul-02 10:29

Hio.. I have 2 win98 machines that are having major toolbar problems.. I am using the following little function to switch out the toolbar:

void CMainFrame::SetToolbarDefault()
{
	// setup buttons on toolbar, and text labels
	m_wndToolBar.SetButtons(NULL, 3);
	m_wndToolBar.SetButtonInfo(0, ID_OPTIONS, TBBS_BUTTON|BTNS_SHOWTEXT, 0);
	m_wndToolBar.SetButtonInfo(1, ID_APP_ABOUT, TBBS_BUTTON|BTNS_SHOWTEXT, 2);
	m_wndToolBar.SetButtonInfo(2, ID_EXITBTN,TBBS_BUTTON|BTNS_SHOWTEXT, 3);
	m_wndToolBar.SetButtonText(0,"Options");
	m_wndToolBar.SetButtonText(1,"About");
	m_wndToolBar.SetButtonText(2,"Exit");
	
	// invalidate the call update handlers before painting
	m_wndToolBar.Invalidate(TRUE);
	m_wndToolBar.UpdateWindow();
	Invalidate(TRUE);
	UpdateWindow();
}

i have another function which is basicly the same which switches the toolbar to a different set of menus.. both have the following problem:
as soon as the SetToolbarDefault()gets called the menus become grey.. and they dont ever redraw.. if you move the window around, the area where the toolbar should be is all distorted, showing other things behind where the toolbar should be.. its like it never gets redrawn again, ever, until i exit the program and re-enter..

plz keep in mind that these buttons do have handlers, and they are not just greyed out as if they didnt have a message handler.. also these menus work fine under win 2000.. plz tell me someone has an idea on this one? Confused | :confused:

-dz

RichEdit scrolling

Kuniva1-Jul-02 10:22

Kuniva

1-Jul-02 10:22

Hi, i want to let me richEdit control scroll to the very bottom whenever new text is added. Most examples here use LineScroll(1) to scroll down by 1 line whenever text is added but when your richedit has the style WS_HSCROLL turned off, then whenever the text is longer than the window width it'll need to scroll down more than one line...
I can't just do LineScroll(5) or anything like that either cause then it'll scroll down till the last line is at the top of the control, and thats not pretty either now is it..

Any ideas?
thanks.

P.S.: LineScroll doesn't even seem to work under WIN2000, i'd like to have something that works under WIN2000/WINXP as well

Kuniva
--------------------------------------------

Re: RichEdit scrolling

1-Jul-02 10:28

I found this works:

// Give it focus
theApp.m_hwndPWOutputWindow->GetRichEditCtrl().StreamIn(SF_TEXT | SFF_SELECTION, es);

// Send some keys to cause it to move right to the bottom <-,->
theApp.m_hwndPWOutputWindow->SendMessage(WM_KEYDOWN,37,0);
theApp.m_hwndPWOutputWindow->SendMessage(WM_KEYDOWN,39,0);
if(!gbTalk)
{
theApp.m_hwndPWOutputWindow->SetFocus();
theApp.m_hwndPWOutputWindow->UpdateWindow();
}
theApp.m_hwndPWOutputWindow->UpdateWindow();

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