关于*&的不解

[lishihan]

有这样一段：
DWORD dwDIBSize; //////1
LPBITMAPINFOHEADER lpBI;///2
dwDIBSize=*(LPDWORD)lpBI+::PaletteSize((LPSTR)lpBI;///3
请问大虾们：第三句的“*(LPDWORD)lpBI”是什么意思？它和*（&)&是一样吗？都怎么理解呢？先谢谢大虾了。

[fvv]

不一样.指针和取地址不太一样.
*(LPDWORD)lpBI 只是把lpBI 转换成(LPDWORD)型的指针.*(LPDWORD)lpBI代表转换后指针所指向的内存的值 .（&)不是类型,应该不能这样用吧.没有试过.按面上来看它因该等价于*&&.
int i; *&&i; 它的值应该是i的地址.都没有调试.只是随便说说,看看别人怎么说吧.

[smallbull]

当然不一样 *(LPDWORD)lpBI：强制类型转换成LPDWORD后再取地址lpBI的值，而*（&)却还是原来的值。

[lishihan]

上边是“msdn”中的一个例子，虽然你们的解释和我的以前的认识一样，但在此却难解释？
BOOL WINAPI SaveDIB(HDIB hDib, CFile& file)
{
BITMAPFILEHEADER bmfHdr; // Header for Bitmap file
LPBITMAPINFOHEADER lpBI; // Pointer to DIB info structure
DWORD dwDIBSize;

if (hDib == NULL)
return FALSE;

/*
* Get a pointer to the DIB memory, the first of which contains
* a BITMAPINFO structure
*/
lpBI = (LPBITMAPINFOHEADER) ::GlobalLock((HGLOBAL) hDib);
if (lpBI == NULL)
return FALSE;

if (!IS_WIN30_DIB(lpBI))
{
::GlobalUnlock((HGLOBAL) hDib);
return FALSE; // It's an other-style DIB (save not supported)
}

/*
* Fill in the fields of the file header
*/
/* Fill in file type (first 2 bytes must be "BM" for a bitmap) */
bmfHdr.bfType = DIB_HEADER_MARKER; // "BM"

// Calculating the size of the DIB is a bit tricky (if we want to
// do it right). The easiest way to do this is to call GlobalSize()
// on our global handle, but since the size of our global memory may have
// been padded a few bytes, we may end up writing out a few too
// many bytes to the file (which may cause problems with some apps).
//
// So, instead let's calculate the size manually (if we can)
//
// First, find size of header plus size of color table. Since the
// first DWORD in both BITMAPINFOHEADER and BITMAPCOREHEADER conains
// the size of the structure, let's use this.

dwDIBSize = *(LPDWORD)lpBI + ::PaletteSize((LPSTR)lpBI); // Partial Calculation