-->的意思, 左边是指针变量
.的意思是, 左边是非指针变量
static struct http_request *req;
req->method = UH_HTTP_MSG_POST;
static struct http_request req;
req.method = UH_HTTP_MSG_POST;
//---结构和结构指针
typedef struct {
U32 fsize; /* FAT File Size */
U32 fpos; /* FAT File Position Indicator */
} IOB1;
typedef struct iob {
U16 fileID; /* File Identification Number */
U16 flags; /* File status flags */
U8 drive; /* Device Drive Media type */
U8 attrib; /* Attribute Flags */
U16 NumSect; /* Number of sectors */
U32 InitVal; /* Initial content of Flash/RAM */
void *DevCfg; /* Device configuration */
U16 _fblock; /* Current Flash Block index */
U16 _fidx; /* Current File Block index */
U32 _fbot; /* Flash Block free space bottom */
U32 _ftop; /* Flash Block free space top */
U32 _firstClus; /* FAT First Data Cluster */
U32 _lastEntClus; /* FAT Entry (last) Cluster */
U8 _currDatSect; /* FAT Curr Data Sect Offs in Cluster*/
U32 _currDatClus; /* FAT Current Data Cluster */
U32 fsize; /* FAT File Size */
U32 fpos; /* FAT File Position Indicator */
} IOB;
typedef struct falloc {
U32 end;
U16 fileID;
U16 index;
} FALLOC;
//---结构和结构指针的应用
FALLOC fa;
IOB *fcb;
if (fa.fileID == fcb->fileID && fa.index == fidx) {
fcb->_ftop = fa.end;
//---单独1个指针变量也作为结构.
typedef struct {
I16 * aY;
} PARAM1;
PARAM1 * pParam = (PARAM1 *)p;
GUI_DrawGraph(pParam->aY, NumPoints, x0, y0);
GUI_DrawGraph(pParam->aY+15, NumPoints, x0, y0);
PARAM1 Param;
Param.aY = (I16*)GUI_ALLOC_h2p(hMem);
//--- 结构内再应用本结构. LWIP的 pbuf.h
struct pbuf {
struct pbuf *next;//next pbuf in singly linked pbuf chain
void *payload; //pointer to the actual data in the buffer
u16_t tot_len; //p->tot_len == p->len + (p->next? p->next->tot_len: 0)
u16_t len; //length of this buffer
u8_t /*pbuf_type*/ type; //pbuf_type as u8_t instead of enum to save space
u8_t flags; //misc flags
};
//---链表的应用, 参考xucommon/list.h
struct list_head {
struct list_head *next, *prev;
};
static __inline void INIT_LIST_HEAD(struct list_head *list)
{
list->next = list;
list->prev = list;
}
static __inline void __list_add(struct list_head *new, struct list_head *prev, struct list_head *next)
{
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}
static __inline void list_add_tail(struct list_head *new, struct list_head *head)
{
__list_add(new, head->prev, head);
}
static __inline void list_add(struct list_head *new, struct list_head *head)
{
__list_add(new, head, head->next);
}
//--- 结构指针和结构变量的赋值
typedef struct { /* RL Time format (FFS, TCPnet) */
U8 hr; /* Hours [0..23] */
U8 min; /* Minutes [0..59] */
U8 sec; /* Seconds [0..59] */
U8 day; /* Day [1..31] */
U8 mon; /* Month [1..12] */
U16 year; /* Year [1980..2107] */
} RL_TIME;
typedef struct { /* Search info record */
S8 name[256]; /* Name */
U32 size; /* File size in bytes */
U16 fileID; /* System Identification */
U8 attrib; /* Attributes */
RL_TIME time; /* Create/Modify Time */
} FINFO;
static void set_time_date (FINFO *info, FILEREC *frec) {
/* Convert date/time info and write to 'info' structure. */
U32 v;
v = get_u16 ((U8 *)&frec->WriteTime);
info->time.hr = (v >> 11);
info->time.min = (v >> 5) & 0x3F;
info->time.sec = (v & 0x1F) << 1;
v = get_u16 ((U8 *)&frec->WriteDate);
info->time.day = (v & 0x1F);
info->time.mon = (v >> 5) & 0x0F;
info->time.year= ((v >> 9) & 0x7F) + 1980;
}
指针转换
SDK_Node_Real_Data RealData;
memset(&RealData, 0, sizeof(RealData));
//若此为阻塞, 则停在此处而无法判断是否停止
//int ret = recvfrom(PrimaryUDP, pcStr, MAXLEN, 0, (sockaddr *)&sender, &dwSender);
int ret = recvfrom(PrimaryUDP, (char *)&RealData, sizeof(RealData), 0, (sockaddr *)&sender, &dwSender);
typedef int (CALLBACK *fRealDataCallback)(unsigned long handle, int seq, const SDK_Node_Real_Data *data);
static fRealDataCallback g_fRealDataCallback = NULL;
if (g_fRealDataCallback) {
g_fRealDataCallback(handle, seq, (const SDK_Node_Real_Data *)&RealData);
}
//--- 多层结构指针应用, mini-xml. f:\linux-xu\1-wire\mxml
typedef struct mxml_attr_s /**** An XML element attribute value. @private@ ****/
{
char *name; /* Attribute name */
char *value; /* Attribute value */
} mxml_attr_t;
typedef struct mxml_element_s /**** An XML element value. @private@ ****/
{
char *name; /* Name of element */
int num_attrs; /* Number of attributes */
mxml_attr_t *attrs; /* Attributes */
} mxml_element_t;
typedef union mxml_value_u /**** An XML node value. @private@ ****/
{
mxml_element_t element; /* Element */
} mxml_value_t;
struct mxml_node_s /**** An XML node. @private@ ****/
{
mxml_value_t value; /* Node value */
struct mxml_node_s *next; /* Next node under same parent */
struct mxml_node_s *prev; /* Previous node under same parent */
};
//调用例程, 第一层为指针用 ->, 其余层无论是否指针用 .
mxml_node_t *state,*url;
state->value.element.num_attrs
state->value.element.attrs[i].name
state->value.element.attrs[i].value
//-------------- 良好的代码可扩展性实例 --------------------------------------------------
typedef struct {
const char *name;
u8_t shtml;
} default_filename;
const default_filename g_psDefaultFilenames[] = {
{"/index.shtml", true },
{"/index.ssi", true },
{"/index.shtm", true },
{"/index.html", false },
{"/index.htm", false }
};
#define NUM_DEFAULT_FILENAMES (sizeof(g_psDefaultFilenames) / sizeof(default_filename))
for(loop = 0; loop < NUM_DEFAULT_FILENAMES; loop++) {
uri = (char *)g_psDefaultFilenames[loop].name;
file = fs_open((char *)g_psDefaultFilenames[loop].name);
if(file != NULL) {
DEBUG_PRINT("Opened %s\n", uri);
#ifdef INCLUDE_HTTPD_SSI
hs->tag_check = g_psDefaultFilenames[loop].shtml;
#endif
break;
}
}
tWidget *g_psScreens[] = {
(tWidget *)&g_sHomeScreen,
(tWidget *)&g_sIOScreen,
(tWidget *)&g_sDemoScreen,
(tWidget *)&g_sImageScreen,
(tWidget *)&g_sAudioScreen,
};
#define NUM_SCREENS (sizeof(g_psScreens) / sizeof(tWidget *))
//--- 应用结构以获得对应的参数
#ifdef DYNAMIC_HTTP_HEADERS
typedef struct {
const char *pszExtension;
unsigned long ulHeaderIndex;
} tHTTPHeader;
const char *g_psHTTPHeaderStrings[] = {
"Content-type: text/html\r\n\r\n",
"Content-type: text/html\r\nExpires: Fri, 10 Apr 2008 14:00:00 GMT\r\n" \
"Pragma: no-cache\r\n\r\n",
"Content-type: image/gif\r\n\r\n",
"Content-type: image/png\r\n\r\n",
"Content-type: image/jpeg\r\n\r\n",
"Content-type: image/bmp\r\n\r\n",
"Content-type: application/octet-stream\r\n\r\n",
"Content-type: application/x-javascript\r\n\r\n",
"Content-type: audio/x-pn-realaudio\r\n\r\n",
"Content-type: text/css\r\n\r\n",
"Content-type: application/x-shockwave-flash\r\n\r\n",
"Content-type: text/plain\r\n\r\n",
"HTTP/1.0 200 OK\r\n",
"HTTP/1.0 404 File not found\r\n",
"Server: lwIP/1.3.0 \r\n",
"\r\n
404: The requested file cannot be found." \
"
\r\n",
"Content-type: application/xml\r\n\r\n"
};
#define HTTP_HDR_HTML 0
#define HTTP_HDR_SSI 1
#define HTTP_HDR_GIF 2
#define HTTP_HDR_JPG 3
#define HTTP_HDR_PNG 4
#define HTTP_HDR_BMP 5
#define HTTP_HDR_APP 6
#define HTTP_HDR_JS 7 //"Content-type: application/x-javascript\r\n\r\n",
#define HTTP_HDR_RA 8
#define HTTP_HDR_CSS 9
#define HTTP_HDR_SWF 10
#define HTTP_HDR_DEFAULT_TYPE 11
#define HTTP_HDR_OK 12
#define HTTP_HDR_NOT_FOUND 13
#define HTTP_HDR_SERVER 14
#define DEFAULT_404_HTML 15
#define HTTP_HDR_XML 16 //"Content-type: application/xml\r\n\r\n"
//列出所有的文件类型, 必须包含所有的. 09-3
tHTTPHeader g_psHTTPHeaders[] = {
{ "html", HTTP_HDR_HTML},
{ "htm", HTTP_HDR_HTML},
{ "shtml",HTTP_HDR_SSI},
{ "shtm", HTTP_HDR_SSI},
{ "ssi", HTTP_HDR_SSI},
{ "gif", HTTP_HDR_GIF},
{ "png", HTTP_HDR_PNG},
{ "jpg", HTTP_HDR_JPG},
{ "bmp", HTTP_HDR_BMP},
{ "class",HTTP_HDR_APP},
{ "cls", HTTP_HDR_APP},
{ "js", HTTP_HDR_JS},
{ "ram", HTTP_HDR_RA},
{ "css", HTTP_HDR_CSS},
{ "swf", HTTP_HDR_SWF},
{ "xml", HTTP_HDR_XML} //09-3
};
#define NUM_HTTP_HEADERS (sizeof(g_psHTTPHeaders) / sizeof(tHTTPHeader))
#endif
