Re: Convert CString to int or float - C / C++ / MFC Discussion Boards

Re: Convert CString to int or float

CPallini14-Jul-08 1:47

CPallini

14-Jul-08 1:47

Trupti Mehta wrote:
Where am aI going wrong

You didn't allocate memory for the dest buffer.
The buffer should large enough to get the converted string. Hence you may write

int iLen = csValue.GetLenght(); 
char * dest = new char[iLen+1];
WideCharToMultiByte(CP_ACP, 0, csValue, -1, dest, iLen, NULL, NULL);
// Perform conversion to float
delete [] dest;

or, using a reasonably large array:

char dest[MAX_PATH+1];
WideCharToMultiByte(CP_ACP, 0, csValue, -1, dest, MAX_PATH, NULL, NULL);

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]

Re: Convert CString to int or float

Trupti Mehta14-Jul-08 3:35

Trupti Mehta

14-Jul-08 3:35

Thanks CPallini, its working perfectly as expected. Got rid from all type casts.

Thanks a lot to all of you trying to solve my problem.

Thanks

Terry

Re: Convert CString to int or float

killabyte11-Jul-08 2:32

killabyte

11-Jul-08 2:32

i think your running into trouble with the double cast

((char*)(LPCTSTR)csValue

i think LPCTSTR boils down to wchar_t

so the double cast (char*)(wchar_t*) would be doing horrid things

the wise Pallini has stated the appropreaite funcs

CPallini11-Jul-08 2:53

CPallini

11-Jul-08 2:53

killabyte wrote:
the wise Pallini

like Alfonso of my sign.
Laugh | :laugh:

Thank you.
Smile | :)

Re: OT

killabyte11-Jul-08 2:57

killabyte

11-Jul-08 2:57

Yeah i really liked that quote in your sig Big Grin | :-D

Re: OT

SandipG 11-Jul-08 3:07

SandipG

11-Jul-08 3:07

I like second more Big Grin | :-D

Regards,
Sandip.

Re: Convert CString to int or float

David Crow11-Jul-08 2:55

David Crow

11-Jul-08 2:55

Trupti Mehta wrote:
m_opNo = atoi((char*)(LPCTSTR)csValue);

What's with all the casts?

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Convert CString to int or float

Mark Salsbery11-Jul-08 5:46

Mark Salsbery

11-Jul-08 5:46

As DavidCrow asked....what's with the casts?

I always recommend using NO casts unless absolutely necessary.
If something doesn't compile without the cast, look CLOSELY AT WHY
before casting away the problem.

In this case, you casted away your compile-time problem and turned
it into a run-time problem Smile | :)

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

CFile Vs CStdioFile

nisha0000011-Jul-08 1:38

nisha00000

11-Jul-08 1:38

Hi

Whats the difference between CFile and CStdioFile ?Why we are use CFile and CStdioFile?

Thanks

Nisha

Re: CFile Vs CStdioFile

CPallini11-Jul-08 1:49

CPallini

11-Jul-08 1:49

Do you feel documentation (CFile [^] & CStdioFile [^]) inadequate on these subjects?

Roughly speacking, since CStdioFile inherits from CFile we espect the former augmenting the latter functionalities: a quick look at documentation show us two interesting methods (ReadString and WriteString) provided only by CStdioFile.
Smile | :)

Re: CFile Vs CStdioFile

Varghese Paul M11-Jul-08 1:50

Varghese Paul M

11-Jul-08 1:50

CFile deals with any kind of files where CStdioFile deals with TEXT files by default with an implicit convertion of newline character 0x0a into a pair of (0x0d and 0x0a)
The two methods, WriteString and ReadString provided in CStdioFile class assumes the delimiters of each line in the file as CRLF and newline. It can also be used for binary files as well, but certain functionality provided by CFile like Duplicate(), LockRange() etc are not supported in CStdioFile.

Control Panel

shakils11-Jul-08 0:55

shakils

11-Jul-08 0:55

If any body can quide me how can Control Panel designing (PC Interfacing) can be done in VC++. Any website or book for designing Control Panels to interface periferals to computer and control them and to collect data for manual test purpose please.

Re: Control Panel

David Crow11-Jul-08 2:56

David Crow

11-Jul-08 2:56

Are you wanting to know how to create a Control Panel applet?

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Control Panel

shakils14-Jul-08 3:04

shakils

14-Jul-08 3:04

Actually I know designing window of control panels, I need to know programming for coms interfacing and data retrieving from external pariferals connected to PC by I2C or RS232. If you know any helping website or book please?

Re: Control Panel

David Crow14-Jul-08 8:18

David Crow

14-Jul-08 8:18

Read from and write to serial ports using ReadFile() and WriteFile().

"Love people and use things, not love things and use people." - Unknown

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Control Panel

shakils17-Jul-08 2:44

shakils

17-Jul-08 2:44

Thanks a lot for help. It gave me a good clue.

load a bitmap to Picture Box from a path in database field

Waguih11-Jul-08 0:37

Waguih

11-Jul-08 0:37

hi every body
can you help me with this
how can I get a bitmap from a path in a database field
in a static picture box in the form view
I am using visaul studioC++ ver 6
thanks

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Re: load a bitmap to Picture Box from a path in database field

Varghese Paul M11-Jul-08 0:50

Varghese Paul M

11-Jul-08 0:50

Is the problem with reading the path from database or loading and displaing the image or both ?

Re: load a bitmap to Picture Box from a path in database field

Waguih12-Jul-08 3:21

Waguih

12-Jul-08 3:21

you see the program consider the field as a string
so how I tell him this is a file path not a string
becuse he fill the other Edit boxes with strings from
the other fields but for the picture box I gave him a static
variable and I use the loadimage and Bitblt but nothing
shown in the picture box

Re: load a bitmap to Picture Box from a path in database field

Waguih12-Jul-08 3:32

Waguih

12-Jul-08 3:32

here is my code I hope you tell me what is wrong with it?
void CFilmsView::OnActivateView(BOOL bActivate, CView* pActivateView, CView* pDeactiveView)
{
// TODO: Add your specialized code here and/or call the base class

CDaoRecordView::OnActivateView(bActivate, pActivateView, pDeactiveView);
//CPaintDC dc(this);
CClientDC dc(this);
HBITMAP bmpHandle = (HBITMAP)LoadImage(NULL,strPictureName,IMAGE_BITMAP,
0,0,LR_COPYFROMRESOURCE);
CBitmap bmpPicture;
CDC mdcPicture;
CBitmap *bmpFromHandle = bmpPicture.FromHandle(bmpHandle);

CRect rctPicture;
m_Picture1.GetWindowRect(&rctPicture);

mdcPicture.CreateCompatibleDC(&dc);
CBitmap * bmpPrevious = mdcPicture.SelectObject(bmpFromHandle);

ScreenToClient(&rctPicture);

dc.BitBlt(rctPicture.left, rctPicture.top,
rctPicture.Width(), rctPicture.Height(),
&mdcPicture, 0, 0, SRCCOPY);

dc.SelectObject(bmpPrevious);
//DeleteObject(bmpHandle);

Re: load a bitmap to Picture Box from a path in database field

CPallini11-Jul-08 0:54

CPallini

11-Jul-08 0:54

What have you done so far?
What are your troubles about?
(i.e. Please be more specific)
Smile | :)

Re: load a bitmap to Picture Box from a path in database field

Waguih12-Jul-08 3:37

Waguih

12-Jul-08 3:37

I gave the picture box a static control
the program fill all the Edit box aith the string variables I gave him but for the picture box he treated the field as a string not a file path here is my code hope you can tell me what is wrong with it
void CFilmsView::OnPaint()
{
strPictureName=m_pSet->m_P1;
strPictureName=("E:\\BMP\\Hany\\Jimy1.bmp");
CPaintDC dc(this); // device context for painting

// TODO: Add your message handler code here

// TODO: Add your control notification handler code here
HBITMAP bmpHandle = (HBITMAP)LoadImage(NULL,strPictureName,IMAGE_BITMAP,
0,0,LR_LOADFROMFILE);
LoadBitmap(0,strPictureName);
CBitmap bmpPicture;
CDC mdcPicture;
CBitmap *bmpFromHandle = bmpPicture.FromHandle(bmpHandle);

CRect rctPicture;
m_Picture1.GetWindowRect(&rctPicture);

mdcPicture.CreateCompatibleDC(&dc);
CBitmap * bmpPrevious = mdcPicture.SelectObject(bmpFromHandle);

ScreenToClient(&rctPicture);

dc.BitBlt(rctPicture.left, rctPicture.top,
rctPicture.Width(), rctPicture.Height(),
&mdcPicture, 0, 0, SRCCOPY);

dc.SelectObject(bmpPrevious);
DeleteObject(bmpHandle);
// Do not call CDaoRecordView::OnPaint() for painting messages
}

Setup & related for EVC application

Trupti Mehta11-Jul-08 0:29

Trupti Mehta

11-Jul-08 0:29

Hi,

I have developed an application in eVc++4 on ARMV4I device. At present the application is ready adn in testing phase. Before handing over the final version, I want to know how to do the following:
1) The user should able to start the application only once i.e. if the application is already running, the user shouldn't be able to open another time the application.
2) Create a setup for the application. I want to restrict the setup being used only 3 times. Creating shortcut on desktop will be handled with the setup.
3) Add the application in the start up.

Any helpline and guidance for the above is highly appreciated.

Thanks

Terry

Tree Control

john563210-Jul-08 23:58

john5632

10-Jul-08 23:58

I have build an application somewhat same to windows explorer.
LeftView inheriting from TreeView and RightView from ListView..right

LeftView captures Expanding message:
ON_NOTIFY_REFLECT(TVN_ITEMEXPANDING, OnTvnExpanding)

But how can I get the HTREEITEM of expanding tree item.

e.g.
When we select a tree item we can get it using
HTREEITEM Item=TreeCtrl.GetSelectedItem();

But in case of expanding how can I get it?

Re: Tree Control

Varghese Paul M11-Jul-08 0:38

Varghese Paul M

11-Jul-08 0:38

MPTP wrote:
When we select a tree item we can get it using
HTREEITEM Item=TreeCtrl.GetSelectedItem();

When you expand a node, it has to be selected or it will be selected before it expands or collaps.
So the same method TreeCtrl.GetSelectedItem(); should work inside the message handler.

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