C / C++ / MFC

Re: how can i find CString value in std::map iterator?

1-Dec-11 20:49

The iterator must be defines as - std::map<CString, std::map<DWORD, CString> >::iterator m_mpIter;
You can then access the key using m_mpIter->first.
To access the value you do m_mpIter->Second.

Since the value is another map, you will need to iterate through that map too.

Here is a nested loop that can iterate through the entire collection -

for (auto i = map1.begin(); i != map1.end(); ++i)
{
  i->first;  // CString key of map
  for (auto j = i->second.begin(); j != i->second.end(); ++j)
  {
    j->first;  // DWORD key of internal map
    j->second; // CString value of internal map
  }
}

I have assumed the map to be named as map1.
Also, since I'm using the auto keyword, this will compile only in VS2010 or later versions.
If you're using older versions of Visual Studio you will need to replace the auto keyword with the following -

std::map<CString, std::map<DWORD, CString> >::iterator i;
std::map<DWORD, CString>::iterator j;

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

Microsoft MVP (Visual C++)

Polymorphism in C

Le@rner1-Dec-11 20:59

Le@rner

1-Dec-11 20:59

i am already use the for loop to chek all value of iteration.

is there no any method to find dirctly the value in iterator without using for loop to chk all value,

thanks.

Re: how can i find CString value in std::map iterator?

«_Superman_»1-Dec-11 21:10

Re: how can i find CString value in std::map iterator?

1-Dec-11 21:10

Sure.
You can do something like (i + 2)->first; or (i + 2)->second;.

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

Microsoft MVP (Visual C++)

Polymorphism in C

Le@rner2-Dec-11 23:35

Le@rner

2-Dec-11 23:35

i dont understand can u please more specific.

or please provide me any example.

Re: how can i find CString value in std::map iterator?

Addy Tas4-Dec-11 11:00

Addy Tas

4-Dec-11 11:00

Not sure what you're asking here; if you know the 'real' key (CString- DWORD) you could use a find on the outer map and another on the second of the returned iterator...

Hoe this helps, AT

Cogito ergo sum

convertion between string and double

Chrissie.ja1-Dec-11 18:51

Chrissie.ja

1-Dec-11 18:51

I have a problem with convertion between string and double as following:

double dValue = 1000;
std::ostrstream oStrStream;
oStrStream << dValue << std::ends;
std::string strValue = oStrStream.str();
//here strValue is "1,000", a comma is added!

//when I use following code to convert, error occurred.
double dValue = strtod( strValue .c_str(), NULL );
//here dValue is "1", it seems "," can't be recognized!

How to avoid this? Is there any way to avoid adding comma when convert double to string?

«_Superman_»1-Dec-11 20:56

1-Dec-11 20:56

ostrstream is not supported anymore.
Try using ostringstream;

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

Microsoft MVP (Visual C++)

Polymorphism in C

Chrissie.ja1-Dec-11 22:22

Chrissie.ja

1-Dec-11 22:22

I got the same result. The problem was not solved yet.

KingsGambit1-Dec-11 23:08

KingsGambit

1-Dec-11 23:08

The problem is due to ',' in '1,000'. Remove ',' and it would work.

Richard MacCutchan1-Dec-11 22:57

1-Dec-11 22:57

You need to parse the string to remove non-numeric characters before trying to convert it. The string is only allowed to follow a specific pattern, as described here[^].

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Addy Tas4-Dec-11 11:10

Addy Tas

4-Dec-11 11:10

I could be wrong here, didn't verify yet, but using the setlocale to LC_NUMERIC for US English shoul make it recognize the thousand seperator as well.
Always consider that there are languages (mine included) that use a different decimal seperator.

Cheers, AT

Cogito ergo sum

Richard MacCutchan4-Dec-11 22:39

Get COM Dll path from an other Exe

4-Dec-11 22:39

If you look at the link I provided you can see which characters may be accepted.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

MrKBA1-Dec-11 0:01

MrKBA

1-Dec-11 0:01

Hi All,
I have to retreive the full path of the COM Dll (named "MyDllCom") from an other Exe.
How do this ?

«_Superman_»1-Dec-11 4:42

1-Dec-11 4:42

If you know the CLSID of the component, you can get the DLL path from the value of the registry key HKEY_CLASSES_ROOT\CLSID\<CLSID of COM>\InprocServer32\(Default).

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

Microsoft MVP (Visual C++)

Polymorphism in C

Richard MacCutchan1-Dec-11 5:15

1-Dec-11 5:15

Back on form I see! Thumbs Up | :thumbsup:

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Albert Holguin1-Dec-11 5:24

Albert Holguin

1-Dec-11 5:24

«_Superman_»1-Dec-11 15:40

How to prevent customization of main menu items (File, Edit, View, Window, Help, ...) when using CMFCMenuBar in Visual Studio 2010

1-Dec-11 15:40

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

Microsoft MVP (Visual C++)

Polymorphism in C

User 2694230-Nov-11 23:08

User 26942

30-Nov-11 23:08

Hello,

I've started moving a MFC MDI application from VS2005 to VS2010 (used the samples Visual C++ 2008 Feature Pack as source) and got some problems with the menu now using CMFCMenuBar.

Normally all the menu items are customizable by the user, but I want to protect the main menu items File, Edit, View, Help, ... from user customizing and only allow the user to add his own main menu(s) to the menu bar.

I thought using CMFCToolBarButton::SetProtectedCommands but that doesn't help for the main items, for the sub menu items this works.
I found also out that I could add the 0 with the call lstProtectedCmds.AddTail( (UINT)0 ); to the protected commends but this prevents the menu bar completely from customizing and the user isn't able to add his own menu to the bar any more.

Any help or ideas are welcome.

Thanks,

Andreas.

How to return char*

Paulraj G30-Nov-11 19:18

Paulraj G

30-Nov-11 19:18

Hi All,

How to reyurn char* in c++? My code is

extern "C" char* callFunction()
{
        std::string stroutput = pObject->ProcessNumber("hi","hi");
        char* strout = new char [stroutput.size()+1];
        strcpy (strout, stroutput.c_str());
        return strout;
        delete[] strout;
    
}

Thanks in advance...

G.Paulraj

«_Superman_»30-Nov-11 19:47

30-Nov-11 19:47

What you've done is almost correct.
2 things are not right.

First, you cannot use extern "C" if you're using std::string because string is an object of the basic_string class.
class is not understood by C.

Second, you cannot delete the memory inside the function.
Deletion has to be done by the caller.
Also there is no point in having any statements after the return statement.

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

Microsoft MVP (Visual C++)

Polymorphism in C

Richard MacCutchan30-Nov-11 22:30

30-Nov-11 22:30

«_Superman_» wrote:
First, you cannot use extern "C" if you're using std::string

The extern "C" merely prevents name decoration of exported function or variable names, it has nothing to do with the underlying C++ code, which may use any classes internally.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

«_Superman_»30-Nov-11 22:35

30-Nov-11 22:35

You're right. My mistake. Sigh | :sigh:

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

Microsoft MVP (Visual C++)

Polymorphism in C

Richard MacCutchan30-Nov-11 23:45