How to implement a WM_COPY handler for a CEdit derived control - C / C++ / MFC Discussion Boards

masnu4-May-06 10:51

4-May-06 10:51

I'm trying to get information from a dialog box and writie it to a binary file. I can use the following code:

m_txtAirplane.GetWindowText(s);<br />
 strcpy(airplane[15], (LPCTSTR)s);

This works fine when I'm using non-Unicode character set, but I loose the "look and feel" of Windows XP on my dialogs.

Is there a way of getting the CString, from a CEdit box, into a char array when I'm using a Unicode character set so that I can preserve the look of Windows XP?

Thanks.

Re: How to get char[] from CEdit control

led mike4-May-06 11:23

led mike

4-May-06 11:23

masnu wrote:
strcpy(airplane[15], (LPCTSTR)s);

You might want to look here[^]

led mike

Re: How to get char[] from CEdit control

RChin4-May-06 11:26

RChin

4-May-06 11:26

For me the easiest way to convert Unicode character sets to ANSI is to use the ATL conversion macro W2A.

<br />
USES_CONVERSION;<br />
char* pszchar = W2A(strText);<br />

btw, What do you mean by the look and feel of Windows XP?

I Dream of Absolute Zero

Re: How to get char[] from CEdit control

Amar Sutar4-May-06 18:53

Amar Sutar

4-May-06 18:53

Use WideCharToMultiByte for conversion from UNICODE to multibyte.

Regards
Amar. Smile | :)

CTreeCtrl derived class problem

Neagoe Gabriel4-May-06 9:48

Neagoe Gabriel

4-May-06 9:48

I am writing an C# plugin which contains a subclassed CTreeCtrl( in c++ ).
I wrote my own OnKeyDown() function and I'm having a strange (may be
normal?) behavior: VK_UP, VK_DOWN, VK_LEFT and VK_RIGHT keys do not
enter this function, though other virtual keys do. I checked it out with
Spy++ and WM_KEYDOWN messages **are** being sent to my control''s window
for every VK. The problem is I wish my control to be navigated with keys
(as in Explorer, you now), and somewhat I'm loosing it... I don't know
where or how to catch those keys. Any clues?

NG

OS in C++

BorolePrashant4-May-06 9:35

BorolePrashant

4-May-06 9:35

this is a bit off topic in this forum... but i was unable to find a better place, so...

i am planning to rewrite my entire C kernel into C++ kernel. i'll be using g++. What basic runtime support will i need? can i use the STL safely? What about exceptions and other advanced features?

[please forgive me. i know this topic does not belong in here. but u all are c++ gurus, so u know the c++ language better, that is why i am asjing here.]

Re: OS in C++

Maxwell Chen4-May-06 19:22

Maxwell Chen

4-May-06 19:22

Since you had written your kernel in C, you should have known the answer to your question.

Maxwell Chen

How to implement a WM_COPY handler for a CEdit derived control

madmax00014-May-06 9:10

madmax0001

4-May-06 9:10

Hi,

I have written a CEdit derived control for displaying formatted float values. Now I want to implement a handler for WM_COPY and WM_PASTE.
The WM_COPY handler for e.g. must copy the unformatted(!) float value to the clipboard.

I have tried something like
BEGIN_MESSAGE_MAP(CMyNumberEdit, CEdit)
ON_MESSAGE(WM_COPY, OnCopy)
END_MESSAGE_MAP()

...

but OnCopy is never called.

Can anyone help me?
THX

Re: How to implement a WM_COPY handler for a CEdit derived control

David Crow4-May-06 9:12

David Crow

4-May-06 9:12

madmax0001 wrote:
ON_MESSAGE(WM_COPY, OnCopy)

Try:

ON_COMMAND(WM_COPY, OnCopy)

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: How to implement a WM_COPY handler for a CEdit derived control

madmax00014-May-06 9:34

madmax0001

4-May-06 9:34

Hi,

I've tried but it is also never called.

Re: How to implement a WM_COPY handler for a CEdit derived control

David Crow4-May-06 10:37

David Crow

4-May-06 10:37

Something else must be up. I used the following and both methods get called:

BEGIN_MESSAGE_MAP(CEditEx, CEdit)
    //{{AFX_MSG_MAP(CEditEx)
    ON_MESSAGE(WM_COPY, OnCopy)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()
...
LRESULT CEditEx::OnCopy( WPARAM wParam, LPARAM lParam )
{
    // handle it here
    return 0;
}
...
LRESULT CEditEx::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 
{
    if (WM_COPY == message)
        ; // or here
 
    return CEdit::WindowProc(message, wParam, lParam);
}

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: How to implement a WM_COPY handler for a CEdit derived control

madmax00014-May-06 11:12

madmax0001

4-May-06 11:12

Hi,

thank you very much. You're right. I have found my problem. I had implemented a handler for WM_CHAR where my editbox content is formatted. To process WM_COPY commands I must call the base class procedure for WM_CHAR for nonprintable characters like this:

void CMyEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
if(isprint(nChar)==0){
CEdit::OnChar(nChar, nRepCnt, nFlags);
return;
}

// Further processing here

}

Now the OnCopy implementation is called !

Smile | :)

std::string to float

rahultaing4-May-06 7:43

rahultaing

4-May-06 7:43

can anyone tell me how to convert a std::string to float type?

Re: std::string to float

Cedric Moonen4-May-06 7:49

Cedric Moonen

4-May-06 7:49

float MyFloat = atof(MyString.c_str());

Re: std::string to float

jiangalong4-May-06 20:35

jiangalong

4-May-06 20:35

float MyFloat=atoi(MyString.c_str());

That's correct!;P

Re: std::string to float

Cedric Moonen4-May-06 20:45

Cedric Moonen

4-May-06 20:45

Err, no, this will convert a string to an integer value, not to a float value. atof convert to a float value.

Re: std::string to float

Michael Dunn4-May-06 8:38

Michael Dunn

4-May-06 8:38

From the C++ FAQ lite:
[39.2] How do I convert a std::string to a number?[^]

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: std::string to float

Roland Pibinger4-May-06 10:41

Roland Pibinger

4-May-06 10:41

Michael Dunn wrote:
From the C++ FAQ lite:
[39.2] How do I convert a std::string to a number?[^]

Please no stringstream solution. Just encapsulate strtod.

Re: std::string to float

Michael Dunn4-May-06 10:53

Michael Dunn

4-May-06 10:53

Sorry for providing a pointer to a FAQ with a solution to the OP's problem.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: std::string to float

led mike4-May-06 11:56

led mike

4-May-06 11:56

Michael Dunn wrote:
OP's

means "Original Poster" ?

led mike

Re: std::string to float

David Crow5-May-06 2:24

David Crow

5-May-06 2:24

Gee Mike, what in the world were you thinking? Roll eyes | :rolleyes:

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"We will be known forever by the tracks we leave." - Native American Proverb

Re: std::string to float

Rob Caldecott4-May-06 13:18

Rob Caldecott

4-May-06 13:18

Roland Pibinger wrote:
Please no stringstream solution.

Out of interest, why not?

Re: std::string to float

Stephen Hewitt4-May-06 15:06

Stephen Hewitt

4-May-06 15:06

I would like to know why not too. While MSVC6s STL implementation is crap and it would be more efficient to use the old C-style functions, other STL versions are more efficient and have less overhead. Efficiency issues aside, there are many advantages to the stringstream solutions such as that fact that it's extensible and you can change the type your converting to simply by changing variable your reading into instead of having to change the function called. The intent is also clearer as the C style function names are obscure to say the least. Another issue is the fact that STL implementations are allowed to implement basic_string in a manner such that calling c_str is not as efficient as the programmer might think. One example is basic_string implementations which don’t use a single contiguous memory block to store the string.

Steve

-- modified at 21:50 Thursday 4th May, 2006

Tray icon notifier when usb plugging

asancho4-May-06 6:32

asancho

4-May-06 6:32

Hello,

Does anybody know if it is possible to show an icon in the system tray (near the clock) when an usb device is plugged in? Is it necessary to develop an additional application? Can I implement it in the driver dll installer?

Thank you!

Re: Tray icon notifier when usb plugging

toxcct4-May-06 6:44

toxcct

4-May-06 6:44

i don't understand... what OS do you use ?
doesn't it show the "Safely Remove Hardware" naturally when you plug any USB drive ??

TOXCCT >>> GEII power

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