C / C++ / MFC

Re: How to make Edit control show text from right top to left down?

14-Jan-10 20:24

You can either format the text before setting it to the edit box or handle the EN_CHANGE notification sent to the parent window class of the edit control and format the text accordingly.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

samfromcn14-Jan-10 21:39

samfromcn

14-Jan-10 21:39

I hope to implement the function like mspaint.exe' s text input. Mspaint has a font toobar, if check the last button on the bar, you can type text from right top to left down.

Error in Visual Studio 2010

Kevin Wee14-Jan-10 13:05

14-Jan-10 13:05

Hi, I'm having some issues with Visual Studio 2010; I have suddenly gotten an error while trying to compile a project that compiled fine in Visual Studio 2008.

The errors are:

error C2440: 'initializing' : cannot convert from 'const char [10]' to 'char *'
error C2440: 'initializing' : cannot convert from 'const char [3]' to 'char *'
error C2440: 'initializing' : cannot convert from 'const char [4]' to 'char *'
error C2440: 'initializing' : cannot convert from 'const char [5]' to 'char *'
error C2440: 'initializing' : cannot convert from 'const char [6]' to 'char *'
error C2440: 'initializing' : cannot convert from 'const char [8]' to 'char *'

The errors come from one of Visual Studio 2010's include files called "xmemory". The code the error points to is:

void construct(pointer _Ptr, _Other&& _Val)
		{	// construct object at _Ptr with value _Val
		::new ((void _FARQ *)_Ptr) _Ty(_STD forward<_Other>(_Val)); // THIS LINE
		}

I have done alot of googling but can find nothing to help me with this, except something about Visual Studio 2010 uses nullptr now instead of the number 0. I really need help. I have no idea what is using xmemory or why this is happening.

«_Superman_»14-Jan-10 15:43

14-Jan-10 15:43

Looks like a conflict between the UNICODE and NON-UNICODE character set.
Check if you're passing in a wide character data type to a function expecting an ASCII data type.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Kevin Wee14-Jan-10 17:02

14-Jan-10 17:02

Thanks for your reply. In my project settings, my character set I'm using is Multi-Byte, if thats what you are asking. I believe that is ASCII.

«_Superman_»14-Jan-10 17:42

14-Jan-10 17:42

If you know which line of produces the error in your code, please post that line and the variable declaration affecting that line.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Kevin Wee14-Jan-10 18:03

14-Jan-10 18:03

I do not know which line it is.

«_Superman_»14-Jan-10 18:12

14-Jan-10 18:12

Comment out a section of the code and build it.
Depending on whether it compiles or not, we can determine if the error occurs in that part of the code.
This way you can pin-point the exact line where the error occurs.

You could also change multi-byte to unicode and try to compile, if that is at all possible.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Kevin Wee14-Jan-10 18:24

14-Jan-10 18:24

I switched to unicode and i get the same errors.

CPallini14-Jan-10 20:14

CPallini

14-Jan-10 20:14

Nah....

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]

Avi Berger14-Jan-10 19:51

Avi Berger

14-Jan-10 19:51

This sounds to me like its coming from an attempt to use a string literal to set up something that is expecting a non-const char *. Since a string literal is const, this is a const violation. Are you setting up 6 items somewhere in your code using 6 string literals of the lengths reported in your error messages?

Dynamic cast [modified]

CODEPC14-Jan-10 11:25

CODEPC

14-Jan-10 11:25

Hi
Suppose I have following:

class A
{
}

class B : public class A
{
}

I have an instance of class A "pClassA". can I cast it to class B?

I want an instance of class B from the existing instance class A. How can I get it?

Thanks,

modified on Thursday, January 14, 2010 5:41 PM

Nemanja Trifunovic14-Jan-10 11:34

Nemanja Trifunovic

14-Jan-10 11:34

Assuming the inheritance is public (in your sample it is private), you can do something like:

A* a = new B;

B* b = dynamic_cast<B*>(a);

utf8-cpp

CODEPC14-Jan-10 11:41

CODEPC

14-Jan-10 11:41

I have following:

A* a = new A;

B* b = dynamic_cast<B*>(a);;  ??????

Moak14-Jan-10 12:02

Moak

14-Jan-10 12:02

Since it is a dynamic cast, a type safety check is incurred at runtime: Add a try catch block and you will know. Alternative answer, if you want an instance of class B you might need to create a new object (if class B has more member variables than class A), a good way to do this could be a specific constructor/assignment operator.

Hope this helps,
M

Webchat in Europe Java | [Coffee]

(only 4K)

CPallini14-Jan-10 12:06

CPallini

14-Jan-10 12:06

You cannot do that: a tiger is an animal, an animal (usually... Roll eyes | :rolleyes:

) isn't a tiger.
Smile | :)

Debugging C macros using Visual Studio

Richard MacCutchan14-Jan-10 21:24

Richard MacCutchan

14-Jan-10 21:24

CODEPC wrote:
I have an instance of class A "pClassA". can I cast it to class B?

No, you can only cast back from derived to base class. In your example a B object is always also an A object, but an A object may not be a B object.

MVP 2010 - are they mad?

ForNow14-Jan-10 6:51

ForNow

14-Jan-10 6:51

Hi,

I am debugging a C app using Visual Studio would anyone know what is
the best approach

Is there an add on for this

Thankx

Rajesh R Subramanian14-Jan-10 6:55

Rajesh R Subramanian

14-Jan-10 6:55

Set break points and step through? You don't need any addons for that. Just the debugger will do.

What sort of specific debugging issue are you having? Is the app multi-threaded? Are there DLLs involved? If so, do you have the source? Ask something more specific.

“Follow your bliss.” – Joseph Campbell

ForNow14-Jan-10 7:08

ForNow

14-Jan-10 7:08

There are pretty big macros

It also multi threaded

Guess there are no easy answers to this

would be nice if I could make a breakpoint

in the macro However I know there is no code associated

with macros variables are just substitued

Nemanja Trifunovic14-Jan-10 7:07

Nemanja Trifunovic

14-Jan-10 7:07

Macros? I feel your pain.

The only approach that works for me is to open the Dissasembly windows (Alt+8 with VC++ keyboard setting) and look there. The macros are expanded into real lines of C code and if you are not comfortable with assembly you can simply ignore that part.

utf8-cpp