C / C++ / MFC Discussion Boards

Lea Hayes30-Aug-04 1:24

30-Aug-04 1:24

Hi,

As an experiment I was trying the following code:

<br />
CString MyNumber = "23.5";<br />
double mynum = atof(MyNumber);<br />
if(mynum >= 3.4E-38 && mynum <= 3.4E+38)<br />
   printf("Data Type = Float");<br />
else<br />
   printf("Data Type = Double");<br />
<br />
MyNumber = "123456789.12345";<br />
mynum = atof(MyNumber);<br />
if(mynum >= 3.4E-38 && mynum <= 3.4E+38)<br />
   printf("Data Type = Float");<br />
else<br />
   printf("Data Type = Double");

However, this always displays the text "Data Type = Float", so I thought that perhaps the atof() function was loosing accuracy. Does anybody know why the floating-point range test doesn't work?

Best Regards,
Lea Hayes

Re: Comparing data-types by value

vcplusplus30-Aug-04 3:12

vcplusplus

30-Aug-04 3:12

123456789.12345 is less then 3.4E+38.

Try this:
MyNumber = "1234567890123456789012345678901234567890.12345";
mynum = atof(MyNumber);
if(mynum >= 3.4E-38 && mynum <= 3.4E+38)
printf("Data Type = Float");
else
printf("Data Type = Double");

Re: Comparing data-types by value

Lea Hayes30-Aug-04 3:57

Lea Hayes

30-Aug-04 3:57

Hi,

I don't know how, but that has solved my problem!

Thanks for your help,
Lea Hayes

Decode a UTF-8 file to a CString?

anderslundsgard30-Aug-04 1:21

anderslundsgard

30-Aug-04 1:21

I’d like to Decode a UTF-8 string to a regular CString. I’m using MFC and don’t really know where to start.
I'm reading a UTF-8 coded file using CStdioFile and CFile.

Has the _T(“…”) something to do with it?

_____________________________

...and justice for all

APe

Re: Decode a UTF-8 file to a CString?

Robert A. T. Káldy31-Aug-04 4:03

Robert A. T. Káldy

31-Aug-04 4:03

Try MultiByteToWideChar(..).

Robert-Antonio

"What do you mean, I can't initialize things in assert()?"

not able to view classview

Anonymous30-Aug-04 1:20

Anonymous

30-Aug-04 1:20

Some how i am not to view the class view tab in my workspace. It happened when i was compiling the proj and it crashed. when i reopened it i wasnt able to view classview tab. everytime i open the workspace i get following warning:

cannot access classview information file.ClassView information will not be accessible.

What Is the solution to this problem???

Re: not able to view classview

Michael P Butler30-Aug-04 1:50

Michael P Butler

30-Aug-04 1:50

Anonymous wrote:
Some how i am not to view the class view tab in my workspace. It happened when i was compiling the proj and it crashed. when i reopened it i wasnt able to view classview tab. everytime i open the workspace i get following warning:

cannot access classview information file.ClassView information will not be accessible.

What Is the solution to this problem???

At a guess. I'd say that the crashed MsDev process is still running. Have a look at the process list via taskmanager and kill the msdev.exe process

Michael

CP Blog [^]

Re: not able to view classview

act_x30-Aug-04 6:28

act_x

30-Aug-04 6:28

Its a pain when u lose this info . i'd suggest that u look in the task manager and kill msdev.exe if its running . if this doesnt work go to ur project folder and delete
the .clw,.aps,.ncb files and reopen ur project . Hopefully things shld be back .

Engineering is the effort !

free downloadable books

swarup30-Aug-04 0:58

swarup

30-Aug-04 0:58

Hi
can some body give the website address for free download of VC++ books. like Beginning Atl Com Programming. it is there on net but now i have forgotten where it was.plus there is a big help file named VC6.chm which around 135 mb. can anybody give the link to download.

Thanks
Swarup

Re: free downloadable books

Anonymous30-Aug-04 1:34

Anonymous

30-Aug-04 1:34

http://mspress.microsoft.com/
try this link

Re: free downloadable books

Ivan Cachicatari30-Aug-04 4:32

Ivan Cachicatari

30-Aug-04 4:32

ftp.runnet.ru/BOOKS

Ivan Cachicatari

NDIS I/O Port Functions

Ayman Mahmoud30-Aug-04 0:51

Ayman Mahmoud

30-Aug-04 0:51

Hi,
I want to use the NDIS I/O Port functions that works in the kernel mode. If any one can provide me with a working example it will be great.

Thanks

Re: NDIS I/O Port Functions

Alexander ^M.,30-Aug-04 4:29

Alexander ^M.,

30-Aug-04 4:29

What exactly are you looking for?

Don't try it, just do it! Wink | ;-)

Re: NDIS I/O Port Functions

Ayman Mahmoud30-Aug-04 14:17

Ayman Mahmoud

30-Aug-04 14:17

I'm looking for a ready made code that send and recieve data using the NDIS I/O port functions

sorry David Crow

kriaz29-Aug-04 23:41

kriaz

29-Aug-04 23:41

I was away from net for a week; checked today and found remarks from ur fans well, I did't mean any thing by that title of thread, simply typed without any anything;

perhaps an on forum sorry is needed.

sorry Rose | [Rose]

kriaz

Re: sorry David Crow

David Crow30-Aug-04 3:08

David Crow

30-Aug-04 3:08

No apology is necessary. I guess your post could have been interpreted two different ways, but I did not take any offense by it. Carry on.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Disable a editbox

Larsson29-Aug-04 22:59

Larsson

29-Aug-04 22:59

How can I disable a Editbox from one dialog to another dialog where tha editbox is?.

Re: Disable a editbox

Anonymous29-Aug-04 23:11

Anonymous

29-Aug-04 23:11

if dialog1 is the class where the edit box is and dialog2 is the class where u r going to disable the dialog box, then

in dialog1----
dialog2 *d2;
d2->editbox.EnableWindow(FALSE);

Re: Disable a editbox

Larsson29-Aug-04 23:23

Larsson

29-Aug-04 23:23

No the editbox is on dialog2 and I want to diable from dialog1

Re: Disable a editbox

Maximilien30-Aug-04 1:02

Maximilien

30-Aug-04 1:02

that's what he wrote...

to add to that, you need to have a pointer to dialog2 in your dialog1.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Disable a editbox

Larsson30-Aug-04 1:15

Larsson

30-Aug-04 1:15

I have that but it don't work for me.

// Try to run this from dialog1
CEdit *EditDis; // Dialog2
EditDis->m_Company.EnableWindow(FALSE); // m_Company is EDIT1

The EnableWindow is NOT something I can use,
I do not have it. What Im I doing wrong?

Re: Disable a editbox

David Crow30-Aug-04 3:24

David Crow

30-Aug-04 3:24

Larsson wrote:
CEdit *EditDis; // Dialog2
EditDis->m_Company.EnableWindow(FALSE); // m_Company is EDIT1

This code makes no sense. If EditDis is an edit control, there is no (logical) way that m_Company can also be an edit control.

Based on the little bit of information you've provided, here's my take:

void Dialog2::SomeFunction( void )
{
    Dialog1 dlg(this); // instead of using the 'this' pointer, you could
                       // pass a pointer to the edit control that Dialog1
                       // needs to operate on.  that would be a 'cleaner'
                       // solution.
    dlg.DoModal();
}
 
class Dialog1 : public CDialog
{
    Dialog1(Dialog2 *pDialog2, CWnd *pParent );
    Dialog2 *m_pDialog2;
};
 
Dialog1::Dialog1(Dialog2 *pDialog2, CWnd *pParent )
{
    m_pDialog2 = pDialog2;
}
 
void Dialog1::SomeFunction( void )
{
    m_pDialog2->m_Company.EnableWindow(FALSE);
}

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Template classes and dllimport

WilliamD29-Aug-04 22:18

WilliamD

29-Aug-04 22:18

Hi all,

I have downloaded the code for C++ Wrapper classes for the COM interfaces of Microsoft XML parser (MSXML) from CodeProject at http://www.codeproject.com/soap/msxmlcpp.asp?df=100&forumid=3092&exp=0&select=911139&msg=911139. I tried to compile the demo project, but I keep getting the error c:\Dev\Samples\XML\XMLWrapper\Source\InterfaceWrapper.h(274): error C2491: 'CInterfaceCallingWrapper<T>::__ctor' : definition of dllimport function not allowed. Cry | :((

This is at the following code:

template<class T>
CInterfaceCallingWrapper<T>::CInterfaceCallingWrapper()
{}

There are several others of this type too. Cry | :((

I am using MSDev 7.1 (Visual Studio .net Professional 2003). Cool | :cool:

The error code description in MSDN is as follows:
---------- ERROR DESCRIPTION ----------
Data, static data members, and functions can be declared as dllimports but not defined as dllimports. The following sample generates C2491:
// C2491.cpp
// function definition
void __declspec(dllimport) funcB() { // C2491
}

// function declaration
void __declspec(dllimport) funcB(); // ok

int main() {
}
---------- END DESCRIPTION ----------

As you can see, the error points to a line in the code that in no way declares a dllimport/export at a definition of the constructor involved. Frown | :-(

How can I fix this? Confused | :confused:

Thanks!

----------------------
William Dicks

Re: Template classes and dllimport

Joaquín M López Muñoz30-Aug-04 0:05

Joaquín M López Muñoz

30-Aug-04 0:05

I've just compiled the demos provided with the article and everything works OK Confused | :confused:

Seems like you're not properly setting the project to generate a DLL. Make sure the macros _AFXDLL and _AFXEXT are defined. This should suffice.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Template classes and dllimport

WilliamD30-Aug-04 1:34

WilliamD

30-Aug-04 1:34

Actually, I did compile the DLL. That was no problem. When I wanted to build DOMXMLDemo I got the error mentioned in my previous message. DOMXMLDemo can be found in http://www.codeproject.com/soap/msxmlcpp/msxmlcpp_demo.zip.

Thanks for your reply!

----------------------
William Dicks

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