Converting Cstring to float - C / C++ / MFC Discussion Boards

Re: Find the focused item in ListCtrl

Tom Wright18-Jan-05 10:26

Tom Wright

18-Jan-05 10:26

GetSelectionMark().

Tom Wright
tawright915@yahoo.com

Re: Find the focused item in ListCtrl

Cyrus Dang18-Jan-05 10:37

Cyrus Dang

18-Jan-05 10:37

Thanks Tom,
While waiting for your replies, I found a solution. That is GetNextItem(-1, LVIS_FOCUSED)
Thanks anyway.

BRs

Re: Find the focused item in ListCtrl

Serge Krynine18-Jan-05 12:38

Serge Krynine

18-Jan-05 12:38

Just wandering why the CListCtrl::GetFirstSelectedItemPosition() is not good enough ?

Re: Find the focused item in ListCtrl

Cyrus Dang18-Jan-05 12:43

Cyrus Dang

18-Jan-05 12:43

Because I wanted to find the focused item, not selected item. By using GetNextItem(), I can directly locate the focused item and that's what I needed.
BRs

creating html file from MFC

Member 143833718-Jan-05 10:11

Member 1438337

18-Jan-05 10:11

hi
Does anyone know how to create html file from a c++ program (MFC)? I am working on a program where i have to generate a report from some database and should be able to print it. so i was thinking of creating report in html file which will be easier to format and print too. but i looked everywhere for some tutorials or any articles... no luck ..

have anyone done something similar? can someone help???
links for tuts or projects anything

thanks

zlich

Re: creating html file from MFC

Shog⁹18-Jan-05 11:03

Shog⁹

18-Jan-05 11:03

The most basic way is to open a text file, write out HTML to it, and close it. If you don't know how to write HTML though, this isn't going to be too easy... but then, neither is anything else i could suggest. Some reporting packages will output to HTML, but if you're using a reporting package then you already have formatting/printing built-in.

Shog⁹

I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...

Re: creating html file from MFC

vaibhavbvp3-Feb-13 18:18

vaibhavbvp

3-Feb-13 18:18

that.s not a very big task,just create the file name by using the .htm or .html extension,n then everything is as simple as creating a html page.for html you could check any site(lots of examples are available).

Converting Cstring to float

Member 166473318-Jan-05 9:25

Member 1664733

18-Jan-05 9:25

I'm trying to convert a Ctring that I read from an edit box into a float.
Here's the code I've got;

	CString result;<br />
	double d1;<br />
<br />
	GetDlgItemText(IDC_EDIT1, result);<br />
	char *txt = (char *) (LPCTSTR) result;<br />
	d1 = atof(txt);<br />

When I display txt I do see the correct decimal number, unfortunately d1 is truncated after to the first digit. I.e. if I enter 26.5 in the edit box (IDC_EDIT1), txt is 26.5 but d1 is only 2.
What I am doing wrong here?
Is there any easier way of reading a float from an edit box?
Cheers,
Pat.

Re: Converting Cstring to float

Budric B.18-Jan-05 9:40

Budric B.

18-Jan-05 9:40

Try something along the lines of
sscanf(txt, "%f", d1);
txt is your string, d is your floating point.

Re: Converting Cstring to float

Tom Wright18-Jan-05 10:30

Tom Wright

18-Jan-05 10:30

Well you could always set a member variable for IDC_EDIT1 to a value as float. Thne no conversions would need to be made.

Tom Wright
tawright915@yahoo.com

Re: Converting Cstring to float

Member 166473319-Jan-05 0:28

Member 1664733

19-Jan-05 0:28

Thanks! I had done it originally but completely forgot to update the data, D'Oh! | :doh:

so it wouldn't work. It does now!!!
Cheers,
Pat.

Re: Converting Cstring to float

jhwurmbach6-Apr-05 5:40

jhwurmbach

6-Apr-05 5:40

Just for the sake of completness, I decided to throw this in after so many weeks:
Boost.org has its lexical cast http://www.boost.org/libs/conversion/lexical_cast.htm[^] which comes in handy whenever you are tempted to use those grizzled and outdated old C-library functions.

"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."

-- Caius Petronius, Roman Consul, 66 A.D.

Re: Converting Cstring to float

vaibhavbvp3-Feb-13 18:20

vaibhavbvp

3-Feb-13 18:20

i personally prefers sscanf_s function,its more reliable

Outside the window

Anonymous18-Jan-05 8:37

Anonymous

18-Jan-05 8:37

How would I go about tracking mouse movement outside the window?

Currently OnMouseMove would only track the mouse within the windows.

Re: Outside the window

User 665818-Jan-05 11:03

User 6658

18-Jan-05 11:03

- call GetCursorPos() in a loop (easy, but very bad idea)
- write a hook
- use DirectInput

there should be other possibilities, but those are the ones I remember right now.

modified 12-Sep-18 21:01pm.

Re: Outside the window

Garth Watkins18-Jan-05 22:01

Garth Watkins

18-Jan-05 22:01

Calling the SetCapture(HWND hWnd) API function will exclusivley send all mouse events to 'hWnd' regardless of whether they occur within the window or outside. Remember to call ReleaseCapture when done.

CDialog child of a toolbar

Giuliana18-Jan-05 8:27

Giuliana

18-Jan-05 8:27

Hi people,

Maybe someone can help me. I have a CDialog derived class in a CToolbar, but I can't get the toolbar to resize to accomodate the dlg. Does anyone have an idea?

UI thread question

Tom Wright18-Jan-05 7:33

Tom Wright

18-Jan-05 7:33

I've created a UI thread and I want my main app to send a message to it. So in my main app I make a call to PostThreadMessage.

In the message map of my UI thread I have:

<br />
BEGIN_MESSAGE_MAP(CMyThread, CWinThread)<br />
	//}}AFX_MSG_MAP<br />
	ON_THREAD_MESSAGE(UWM_STOPTHREAD, OnStopThread)<br />
END_MESSAGE_MAP()<br />

However when I post my message to the thread it never reaches the OnStopThread function that I created. Also I get an error if my function is set like this:

<br />
LRESULT CMyThread::OnStopThread(WPARAM wParam, LPARAM lParam)<br />
{<br />
	AfxMessageBox("OnStopThread");<br />
	m_sConnectSocket.Close();<br />
	PostMessage(myHandle->m_hWnd,UWM_DISCONNECTED, 0, (LPARAM)&thdID);<br />
	ExitInstance();<br />
	return true;<br />

Where it returns an LRESULT. If I take this out and make it a void then it compiles fine but still does not work.

Here is the error I'm getting:
MyThread.cpp(55) : error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall CMyThread::* )(WPARAM,LPARAM)' to 'void (__thiscall CWinThread::* )(WPARAM,LPARAM)'

I'm thinking of just putting a PeekMessage in the PreTranslateMessage and do my calls from here, but from what I've read on flounder.com, this is not a good idea.

Any suggestion please

Thanks

Tom Wright
tawright915@yahoo.com

Re: UI thread question

Serge Krynine18-Jan-05 12:12

Serge Krynine

18-Jan-05 12:12

Tom,

here are two extracts from one of my class (I have removed all unrelated code) that does similar things and works well. Just verify you've got all declarations and definitions right. May be this will help.

Regards,
Serge Krynine

Header File:

class CLogDocument : public CWinThread
{
DECLARE_DYNAMIC(CLogDocument)
enum EThreadMessage
{
WM_ON_LOG_MESSAGE = WM_USER + 1000
};
afx_msg void OnLogMessage(WPARAM nWparam, LPARAM nLparam);
DECLARE_MESSAGE_MAP()
}; // class CLogDocument

Source File:

///////////////////////////////////////////////////////////////////////
IMPLEMENT_DYNAMIC(CLogDocument, CWinThread)

///////////////////////////////////////////////////////////////////////
BEGIN_MESSAGE_MAP(CLogDocument, CWinThread)
ON_THREAD_MESSAGE(EThreadMessage::WM_ON_LOG_MESSAGE, OnLogMessage)
END_MESSAGE_MAP()

///////////////////////////////////////////////////////////////////////
CLogDocument::~CLogDocument()
{
CWinThread::PostThreadMessage(WM_QUIT, 0, 0);
}

///////////////////////////////////////////////////////////////////////
bool CLogDocument::LogMessage(CString const& rstrMessage)
{
DWORD nResult = CWinThread::PostThreadMessage(EThreadMessage::WM_ON_LOG_MESSAGE,
reinterpret_cast<wparam>(pstrMessage),
NULL);
}

///////////////////////////////////////////////////////////////////////
void CLogDocument::OnLogMessage(WPARAM const nWparam, LPARAM const /*nLparam*/)
{
}

Re: UI thread question

Tom Wright19-Jan-05 11:20

Tom Wright

19-Jan-05 11:20

I have mine setup the same way, but it still does not work. The only difference is the way I'm posting my message to my thread...could that be it?

<br />
		if (!PostThreadMessage((DWORD)hdi.lParam, UWM_STOPTHREAD, 0 , 0))<br />
		{<br />
			CString MyMsg;<br />
			MyMsg.Format("Error posting message to thread: %s", m_lClientConn.GetItemText(i, 3));<br />
			AfxMessageBox(MyMsg);<br />
		}<br />

I'm going to try it your way and see if it makes a difference.

Thanks

Tom Wright
tawright915@yahoo.com

How can I affect the result of GetClientRect?

Dimitris Vikeloudas18-Jan-05 7:17

Dimitris Vikeloudas

18-Jan-05 7:17

Hi.

In a CScrollView as far as I realised the GetClientRect returns the size of the physical page of the view. Howe can I alter programatically that size? How can I expand the client area to fit a larger design? What will happen with the co-ordinate system and how do I correct it?

Pls help as I am desperate to deliver something Frown | :(

Thanks

Re: How can I affect the result of GetClientRect?

HurricaneFlossie18-Jan-05 8:28

HurricaneFlossie

18-Jan-05 8:28

Try this. Call GetClientRect, alter the coordinates, then call MoveWindow to update.

Some people see things that are and ask, Why? Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that ...
Author: George Carlin

Re: How can I affect the result of GetClientRect?

Shog⁹18-Jan-05 11:32

Shog⁹

18-Jan-05 11:32

What are you trying to accomplish here? If you change the size of your window, the size of the client changes also. By default, the client is the size of the window, less borders, scrollbars, etc. - if you wish to make it smaller, that is possible, but it is not possible for the client area to ever be larger than the size of the window. Seeing as you're working with a CScrollView, you probably want SetScrollSizes() or some such.

Shog⁹

I'm not the Jack of Diamonds... I'm not the six of spades.
I don't know what you thought; I'm not your astronaut...

Subclassing ListBox so as to provide functionality of both single selection and multiple selection list box

Close Network18-Jan-05 6:58

Close Network

18-Jan-05 6:58

Hello

I need a ListBox that will provide functionality of both single selection and multiple selection listboxes. That means I should be able to singly or multiply make selections in a listbox. I develop with Visual c++ 6.0. What would you suggest ? How would one make it ? I need not to play with colors or anything else. Any help would be greatly appreciated.

Nice Ozgurce

Re: Subclassing ListBox so as to provide functionality of both single selection and multiple selection list box

David Crow18-Jan-05 7:07

David Crow

18-Jan-05 7:07

Nice Özgürce wrote:
That means I should be able to singly or multiply make selections in a listbox.

Why the fuss? A multiselect listbox can do both. Otherwise, you'll need to create both controls on the dialog's template and hide/show each accordingly.

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

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