C / C++ / MFC

convert CString to double

5-Oct-09 6:57

What about documentation [^]?
Smile | :)

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.

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-- Iain Clarke

[My articles]

soongez5-Oct-09 4:46

soongez

5-Oct-09 4:46

Hey, I know this has been asked many times, and I've researched several solutions like atod etc,

here are some bits from my code.

CString line;
chkfile.ReadString(line)
CString token;
token = line.Tokenize(_T(" "),v);
TRACE(L"token %s\n",token);
TRACE(L"converted %d\n",_tstof(token));

chkfile is a CStdioFile.

the TRACE reads something like

token 66
converted 0

Why is always returning error code 0?

Thanks
soong

Re: convert CString to double

Code-o-mat5-Oct-09 5:11

Code-o-mat

5-Oct-09 5:11

soongez wrote:
TRACE(L"converted %d\n",_tstof(token));

%d expects an integer type
_tstof returns a double

Try with %f or %g or somesuch instead of %d.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Re: convert CString to double

Cedric Moonen5-Oct-09 7:50

Cedric Moonen

5-Oct-09 7:50

soongez wrote:
TRACE(L"converted %d\n",_tstof(token));

Wait, so you already have your double in a string but you first want to convert to a float and then back to a string... Why don't use the string directly ?

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

Re: convert CString to double

soongez5-Oct-09 16:27

soongez

5-Oct-09 16:27

Thanks the %f worked, but I used _tstof because the other double converters would give me errors such as cannot convert CString to char* because 'line' was a CString and I couldn't change it to char* when using ReadLine. I'm still pretty poor in using pointers etc.

The TRACE is just to test if the output is correct, it will be used somewhere else later in the program.

cheers.

Change Background image of mesage box

Pryabu5-Oct-09 2:31

Pryabu

5-Oct-09 2:31

Hi all,

I have created a dialog box with blue background color. i want to change the background color of message box too in that dialog.How to add background image to a message box?

Thanks,

CPallini5-Oct-09 2:42

5-Oct-09 2:42

AFAIK you cannot do that with standartd message boxes: you've to roll your own version of.
Smile | :)

kilt8-Oct-09 23:39

kilt

8-Oct-09 23:39

Of course you can !
simply subclass it

CPallini8-Oct-09 23:43

8-Oct-09 23:43

How do you 'subclass' the MessageBox function?
Smile | :)

David Crow5-Oct-09 6:57

David Crow

5-Oct-09 6:57

Do you need to handle the WM_CTLCOLORDLG message?

Can We make ContextMenu as "sytem modal"

Hans Dietrich5-Oct-09 13:58

Hans Dietrich

5-Oct-09 13:58

Do you mean message box as in MessageBox(), or message box as in an IDC_STATIC text control?

Best wishes,
Hans

[Hans Dietrich Software]

Aabid5-Oct-09 2:01

Aabid

5-Oct-09 2:01

Hi
Can Context menu be system modal, so that if any tool tip appears,it should display behind my context menu not above it...

Thanks

Re: Can We make ContextMenu as "sytem modal"

Iain Clarke, Warrior Programmer5-Oct-09 8:50

Iain Clarke, Warrior Programmer

5-Oct-09 8:50

1/ I doubt it.
2/ How long is this menu appearing for? Yikes...
3/ If there was an answer, how long before your competitor says "Can I make my tooltip system modal, so no menu appears on top of it?"

Point 2 is the main one - a menu is a temporary thing.

If you *really* want to do your thing, make a window with lines of text that disappears when you click on one. You don't have to actually use the menu functionality of windows. It will be more work, but tough. You want something way aways from the norm, you have to do it manually.

Iain.

I have now moved to Sweden for love (awwww).
If you're in Scandinavia and want an MVP on the payroll (or happy with a remote worker), or need contract work done, give me a job! http://cv.imcsoft.co.uk/[^]

problem with sizeof()

KASR15-Oct-09 1:18

KASR1

5-Oct-09 1:18

const char* str = "C:\\Documents and Settings\\Test\\TestData";
int i = sizeof(str);

i always 4. why?

Rajesh R Subramanian5-Oct-09 1:23

Rajesh R Subramanian

5-Oct-09 1:23

KASR1 wrote:
const char* str = "C:\\Documents and Settings\\Test\\TestData";
int i = sizeof(str);

i always 4. why?

Because str is a pointer and with sizeof(str), you're NOT finding the length of the string that str is pointing to.

If you need the length of the string, use strlen (or yet better use TCHAR and _tcslen)

It is a crappy thing, but it's life -^ Carlo Pallini

KASR15-Oct-09 1:54

KASR1

5-Oct-09 1:54

i have replaced with strlen() it works fine.

Code-o-mat5-Oct-09 1:31

Code-o-mat

5-Oct-09 1:31

Aside of what Rajesh R Subramanian suggested you can also try:

const char str[] = {"C:\\Documents and Settings\\Test\\TestData"};
int i = sizeof(str); //Note that this will also include the terminating NULL character

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Nemanja Trifunovic5-Oct-09 7:23

Nemanja Trifunovic

5-Oct-09 7:23

Code-o-mat wrote:
const char str[] = {"C:\\Documents and Settings\\Test\\TestData"};

No need for curly braces here.

utf8-cpp

Code-o-mat5-Oct-09 8:02

Code-o-mat

5-Oct-09 8:02

But they don't hurt either.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Cedric Moonen5-Oct-09 1:32

Cedric Moonen

5-Oct-09 1:32

str is a char*, and a pointer has always a size of 4 bytes. sizeof returns the size of the pointer in this case, not the content. As Rajesh mentioned, you should use strlen instead.

Cédric Moonen
Software developer

Charting control [v2.0]
OpenGL game tutorial in C++

goonyangxiaofang5-Oct-09 1:45

goonyangxiaofang

5-Oct-09 1:45

You can try:
const char str[] = "C:\\Documents and Settings\\Test\\TestData";
int i = sizeof(str);

The difference is the name of array and the pointer.

CPallini5-Oct-09 3:55