wifstream problem

[ionutdinulescu]

Hello.
I write some information into a binary file:
int iLevel
WideString sCode;
wofstream *f=new wofstream(s,ios::binary);
....
f.write((wchar_t*)&(iLevel),sizeof(int));
iLen=t->sCode.Length();
f.write((wchar_t*)&iLen,sizeof(int));
f.write(sCode.c_bstr(),iLen);

When I want to get it back:
wifstream* f=new wifstream(s.c_str(),ios::in|ios::binary);
wchar_t* c;
...
f->read((wchar_t*)&iLevel,sizeof(int));
f->read((wchar_t*)&iLen,sizeof(int));
f->read(c,iLen);
sCode=WideString(c);
I obtain the right iLevel and iLen, but Access violation occurs when trying to read variable c.
Can you find the problem ?

 

[Cagliostro]

Ion, look at:
wchar_t* c;

you have not initialized variable c. In my opinion you should alloc space for it.

Ion Filipski

ICQ: 95034075
AIM: IonFilipski
filipski@excite.com

 

[ionutdinulescu]

Now I initialized c with:
wchar_t* c=L"";
There is another problem. If I write to the file 0 and 'Dep1', I obtain the following results:

iLevel=0
iLen=4
c=Dep1d\x6200\x7361\x6369\x735f\x7274\x6e69g
If I write 0 and 'De', then I obtain
ilevel=0
iLen=2
c=De\x6464\x.........

I really don't know the cause.

 

[chipperMDW]

You initialized it, but you still didn't allocate any space for it (except maybe a byte).

 

[Cagliostro]

Ion,
wchar_t* c=L"";//there are one single letter allocated
//alloc at least 128 characters under it
c = new wchar_t[100];

Ion Filipski

ICQ: 95034075
AIM: IonFilipski
filipski@excite.com