C / C++ / MFC

Ajeesh c v wrote:

int * p = NULL; delete p;

how the datas will be deleted from the location which is pointed by p initialy.
since u r saying to delete the pointer after asigning the pointer to null.

Ajeesh c v wrote:

how the datas will be deleted from the location which is pointed by p initialy.
since u r saying to delete the pointer after asigning the pointer to null.

int* pTest;
if (pTest)
   delete pTest;

if( p != NULL )
{
    delete p;
    p = NULL;
}

delete p;
p = NULL;

<br />
CMyDialog* pMyDialog;<br />
pMyDialog = new CMyDialog;<br />
pMyDialog->Create(IDD_TEST);//id from dialog<br />
pMyDialog->EndDialog(0);<br />
delete pMyDialog ;<br />
pMyDialog = 0;<br />

RahulOP wrote:

avctx=(AVCodecContext *)p4;
if(avctx==NULL){
CString str;
int a = GetLastError();
str.Format("%d",a);
AfxMessageBox(str);}
avctx->bit_rate=64000;

Cedric Moonen wrote:
And what are you trying to do here ? You are casting a function pointer into a pointer of type AVCodecContext*. That's logical that you will have some problems. You try to get a return from the function ? Then you need to put the exact function prototype in the typedef (with the return and the arguments of the function). Then, you can simply call it like another function and get the returned value.

RahulOP wrote:

AVCodecContext is defined in avcodec.h as struct.

typedef void (avcodec_alloc_context)();

typedef AVCodecContext* (avcodec_alloc_context)();

AVCodecContext *avctx = p4(); 

RahulOP wrote:

gave me a lot of linker errors LNK 2019 and LNK2001

VuNic wrote:

I think he's shooting in the dark!

AVCodec *codec;<br />
    AVCodecContext *c= NULL;<br />
    int frame_size, i, j, out_size, outbuf_size;<br />
    FILE *f;<br />
    short *samples;<br />
    float t, tincr;<br />
    uint8_t *outbuf;<br />
    /* find the MP2 encoder */<br />
    codec = avcodec_find_encoder(CODEC_ID_MP2);<br />
    c= avcodec_alloc_context();<br />
        /* put sample parameters */<br />
    c->bit_rate = 64000;<br />
    c->sample_rate = 44100;<br />
    c->channels = 2;