Question

convert Cstring to char *

Asked by: sutejok

Hi,

I use this method to convert CString to char*

CString data;
const char* data_char = (LPCTSTR) data;

but this method works only if i use const char*. This means i cant manipulate it rite?

how do i make it into char * instead of const char* ?

or, can someone suggest other method?

thx

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Asked On
2004-07-18 at 03:51:18ID21062532
Tags

cstring

,

char

,

convert

Topic

Windows MFC Programming

Participating Experts
4
Points
500
Comments
9

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Answers

 

by: lemmeCPosted on 2004-07-18 at 04:06:14ID: 11577514

CString data="somestring";
char * data_char= new char[data.GetLength()+1];
strcpy(data_char, data);

 

by: lemmeCPosted on 2004-07-18 at 04:22:21ID: 11577549

Another way of doing it would be:

CString data = "somestring";
char * data_char = data.LockBuffer();
//Code using data_char
data.UnlockBuffer(); //After data_char 's work is done.
 

 

by: lemmeCPosted on 2004-07-18 at 04:31:21ID: 11577563

Yet another way of doing it would be:

char* data_char = data.GetBuffer();

//When you're done using data_char, use ReleaseBuffer().
data.ReleaseBuffer();

 

by: lemmeCPosted on 2004-07-18 at 04:39:46ID: 11577579

Using GetBuffer allows you to specify the minimum length of the string buffer you require. So that way is probably the most flexible one.

 

by: vijay_visanaPosted on 2004-07-18 at 05:01:45ID: 11577624

const char* data_char = (LPTSTR)(LPCTSTR) data;

 

by: vijay_visanaPosted on 2004-07-18 at 05:13:24ID: 11577645


remember that the pointer returned by LPCTSTR operator is valid during life time of CString object.
copy the content of CString to your char pointer if you're to use it after the CString object  life time.
e.g.

const char* data;
      {
            CString csTemp("vijay");
            data = (LPTSTR)(LPCTSTR)csTemp;
                                //data has string value
                               ....
                               ....
                            .....

      }//CString object life time ends here
            // from here data is pointing to string anymore




some points to remeber before using Buffer functions of CString.
If you use the pointer returned by GetBuffer to change the string contents, you must call ReleaseBuffer before using any other CString member functions

The address returned by GetBuffer may not be valid after the call to ReleaseBuffer since additional CString operations may cause the CString buffer to be reallocated.

The buffer memory will be freed automatically when the CString object is destroyed.

 

by: sutejokPosted on 2004-07-18 at 05:34:32ID: 11577682

thx guys!

 

by: wibuusPosted on 2008-08-12 at 10:40:03ID: 22215266

This works for me :-)

CString data;
data.SetString((wchar_t*)L"somestring");
char * pbDest= new char[data.GetLength()+1]; 
wcstombs (pbDest, data.GetBuffer(), cbDest);	

                                              
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by: soumenbPosted on 2009-06-04 at 05:29:38ID: 24546150

best way :

wsprintf(char[], "%LS", CString);

enjoy...

20120131-EE-VQP-002

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