copying data from wchar * to cstring

Did you try this:

cbuff = (LPCWSTR)buff;

actually i m allocating memory with heapalloc
the program crashes access violation

but works if used malloc and free

Espen Harlinn and john i tried in both ways ..works if used malloc and crashes if used heapalloc

WCHAR *buff=(WCHAR*)HeapAlloc(GetProcessHeap(),0,100);
//	 WCHAR *buff=(WCHAR*)malloc(100);
 wcscpy(buff,L"rajesh");
 CString cbuff;
 cbuff=CString(buff);
  // free(buff);
   HeapDestroy(buff);

Click here ->[^]

First question is... why are you using malloc or an OS function (HeapAlloc) when there's new/delete built into the language? If you use new or delete you can get rid of the cast and don't have to worry about sizing arrays.

Second question is... does the code work if you use the explicit unicode specialisation of CString, CStringW? If it does then you're probably not compiling with /D_UNICODE or /DUNICODE.

Another thing to consider is whether you need to actually need to use dynamic memory in the first place. If you're just trying to sort out a buffer to do I/O then just make the buffer an automatic array and you'll find the code is far simpler and more efficient to boot.

Cheers,

Ash

hi ash
i m using heapalloc because i can use heaprealloc to resize it instead of deleting and creating it again if i use new.
i m compiling with _UNICODE

regards
rajesh