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I dont want to use the dropdownlist because in my application based on the combobox selection another combo box has to be populated with the first combobox seleted item.
EX: if i click "alphabets"
i have to set the other combobox to this value,
and i am not able to use the m_combobox2.setwindowtext() and also
SetDlgItemText(idc_combobox2,"string"); if i use the dropdownlist
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Hi i am new to the concepts of mfc..
in my application i want to change the backgroung color of the button through ctlcolor for that i am ticking the option owner draw for the button.when i try to run the application i am getting abort error..
can anybody please suggest me the reason for this???
Thanks in advance...
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hariakuthota wrote: can anybody please suggest me the reason for this???
The debugger can (for free!).
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]
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CPallini wrote: The debugger can (for free!)
Who is that guy? Does he make house calls?
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Luc Pattyn wrote: Who is that guy?
Girl my friend, girl. And it's lovely to have a break with her (or simply a watch).
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]
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Aha. That could be the reason why people tend to spend so much time debugging...
But then I wonder why they ask for help on sites like this one 
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Possibly because girls drive you crazy, after a while...
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]
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Can any one help me to truncate the string based on the buffer size, for the below show scenario.
main()
{
int size = 50;
char errmsg [size];
get_last_error( errmsg, size );
cout<<errmsg;
}
get_last_error( char *errmsg, int bufsize )
{
string sErrMsg;
if ( sErrMsg.capacity() > bufsize )
{
// here i want to truncate the string, so that the size of string will fit into "bufsize". Then copy the string to errmsg
// strcpy( errmsg, sErrMsg.c_str() );
// how to truncate the string based on given buffersize
// so that we can atlest copy the possible string to errmsg if not the whole string
}
else
{
strcpy( errmsg, sErrMsg.c_str() );
*errcode = nErrCode;
}
}
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Nandu_77b wrote: // how to truncate the string based on given buffersize
How about the substr() method?
"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
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Nandu_77b wrote:
// how to truncate the string based on given buffersize
How about the substr() method?
substr() this fun will not take buffer size, it takes length of characters. I need to truncate based on buffer size. Please see my code which will give you clear idea.
-Nandu
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If the size of your buffer is 50, then you would extract characters 0-49.
"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
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What about strncpy [^]?
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]
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strncpy() will also take char length not the buffersize.
- Nandu
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--strncpy() will also take char length not the buffersize.
- Nandu
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Are you aware that, for ANSI strings, the char length and the buffer size (bytes) are basically the same?
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]
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Yes you are correct,
Thanks
Nandu
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lstrcpynA(errmsg, bufsize);
If using TCHAR, do:
<br />
lstrcpyn(errmsg, bufsize / sizeof(TCHAR));
(lstrcpyn is a tiny bit more efficient than strncpy since it doesn't fill the rest of the buffer with zeros after completing the copy. With large buffers, this is generally a waste of cycles.)
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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Hi,
I have created an SDI application with tabbed view. I have used view class derived from CTabView (class from MFC Feature Pack). I want to show different toolbars on the MainFrame for each tab and alternately change the toolbars when the tab selection is changed. But i have problems with swithching the toolbars. Is there any way to switch the toolbars or associate a custom toolbar for each tab of the view?
Thanks
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Dear All,
I have two classes Test and Test1. I have a static variable in the class Test and I have to access it in another class Test1 from a funtion. When I access it, I got linker error. The error is :
1>Test1.obj : error LNK2001: unresolved external symbol "public: static int Test::cnt" (?cnt@Test@@2HA)
1>Test.obj : error LNK2001: unresolved external symbol "public: static int Test::cnt" (?cnt@Test@@2HA)
Code snippet :
class Test : public CDialog,public CDemux
{
DECLARE_DYNAMIC(DecodeTS)
Public
static int cnt;
.......
void Test1::GetData()
{
int cnt =Test::cnt;
}
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This is a known quirk in C++: For static variables in a class, you need to repeat the declaration in the .cpp file.
So add this:
int Test1::cnt;
to your .cpp file and it will stop this linker error.
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I have the static variable in Test class. When I declare again in Test.cpp it shows redefinition error. I do like this in Test.cpp file.
int Test::cnt;
Linker error gone but another error occur as redefinition.
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Hello Alan,
Now I have fixed it, the problem is that I give the int Test::cnt; in the constructor and thats why the error I got. Now I give the line at the top of the cpp file and it is working fine.
Thank you very much.
Many thanks.
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Alan Balkany wrote: This is a known quirk in C++: For static variables in a class, you need to repeat the declaration in the .cpp file.
It's not a quirk, and you're not re-declaring the variable.
The one-and-only static member variable instance needs to exist
somewhere, so you have to define that instance.
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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But this is counterintuitive; you don't have to redeclare the non-static class members.
I got burned by this quirk years ago. I've seen several other people run into this same problem on this forum over the years. There's no good reason for this behavior.
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Alan Balkany wrote: you don't have to redeclare the non-static class members.
A declaration is not an instance. You are NOT declaring static member variables twice.
You declare the variable once, and you also must provide an instance of the variable.
Non-static members are not the same - every existing object (instance) of the type gets its
own instance of the variable.
Alan Balkany wrote: There's no good reason for this behavior.
You'll have to ask Bjarne for the good reason
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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