How to get a pointer to starting bits of HBITMAP?

[answer]

I have created a DC using CreateCompatibleDC and attached an HBITMAP created using CreateCompatibleBitmap(). Everything works fine with windows api's . I have tryed using GetObject(HBITMAP, ..., &BITMAP), The BITMAP.bmBits is alway's NULL .

temp = GetObject(hbit, 0, NULL);
bmp = (BITMAP *)malloc(temp);
GetObject(hbit, temp, bmp);
lptr = (long *)bmp->bmBits;
if(lptr == NULL){MessageBox(hwnd, "it is NULL", "nothing", 0);}

Anyone know how to get a pointer to the starting bits of a HBITMAP?