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The Second option is to set up a hook function. The hook function will be called by the µC/HTTP-client core to add a Header Field to the request. The hook function will be called until it return DEF_YES to notified the µC/HTTP-client stack that all the fields have been added. The API function HTTPc_ReqSetParam must be used with the parameter type HTTPc_PARAM_TYPE_REQ_HDR_HOOK to pass out hook function pointer to the µC/HTTP-client stack.
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| Response header hook |
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| Response header hook |
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| Code Block |
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| language | cpp |
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| title | Listing - Adding Header Fields with a Hook Example Code |
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| linenumbers | true |
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#define HTTPc_CFG_HDR_NBR_MAX 10
#define HTTPc_CFG_HDR_VAL_LEN_MAX 100
CPU_INT08U HTTPc_ReqHdrIx;
HTTPc_HDR HTTPc_ReqHdrTbl[HTTPc_CFG_HDR_NBR_MAX];
CPU_CHAR HTTPc_ReqHdrValTbl[HTTPc_CFG_HDR_NBR_MAX][HTTPc_CFG_HDR_VAL_LEN_MAX];
/*
*********************************************************************************************************
* HTTPc_ReqPrepare()
*
* Description : Prepare the HTTP request to send.
*
* Argument(s) : p_req Pointer to the HTTP Request object to configure.
*
* Return(s) : DEF_OK, if the request was configured successfully.
* DEF_FAIL, otherwise.
*********************************************************************************************************
*/
static CPU_BOOLEAN HTTPc_ReqPrepare (HTTPc_REQ_OBJ *p_req)
{
HTTPc_ERR err;
/* ------------ SET STRING QUERY PARAMETER ------------ */
HTTPc_ReqSetParam(p_req, HTTPc_PARAM_TYPE_REQ_HDR_HOOK, &HTTPc_ReqHdrHook, &err);
if (err != HTTPc_ERR_NONE) {
return (DEF_FAIL);
}
p_req->UserDataPtr = (void *)&HTTPc_ReqHdrIx;
... /* TODO other operations on request if necessary. */
return (DEF_OK);
}
/*
*********************************************************************************************************
* HTTPc_ReqHdrHook()
*
* Description : Hook function to retrieve the header fields to include in the HTTP request.
*
* Argument(s) : p_conn Pointer to the HTTP Connection object.
*
* p_req Pointer to the HTTP Request object.
*
* p_hdr Variable that will received the pointer to the Header field object.
*
* Return(s) : DEF_YES, if all the header fields to include have been passed.
* DEF_NO, otherwise.
*********************************************************************************************************
*/
static CPU_BOOLEAN HTTPc_ReqHdrHook (HTTPc_CONN_OBJ *p_conn,
HTTPc_REQ_OBJ *p_req,
HTTPc_HDR **p_hdr)
{
HTTPc_HDR *p_hdr_item;
CPU_INT08U index;
index = *(CPU_INT08U)p_req->UserDataPtr;
switch(index) {
case 0:
p_hdr_item = &HTTPc_ReqHdrTbl[0];
p_hdr_item->ValPtr = &HTTPc_ReqHdrValTbl[0][0];
p_hdr_item->HdrField = HTTP_HDR_FIELD_ACCEPT;
(void)Str_Copy_N(p_hdr_item->ValPtr, "text/*", HTTPc_CFG_HDR_VAL_LEN_MAX);
p_hdr_item->ValLen = Str_Len_N(p_hdr_item->ValPtr, HTTPc_CFG_HDR_VAL_LEN_MAX);
*p_hdr = p_hdr_item;
index++;
*(CPU_INT08U)p_req->UserDataPtr = index;
return (DEF_NO);
case 1:
p_hdr_item = &HTTPc_ReqHdrTbl[1];
p_hdr_item->ValPtr = &HTTPc_ReqHdrValTbl[1][0];
p_hdr_item->HdrField = HTTP_HDR_FIELD_DATE;
(void)Str_Copy_N(p_hdr_item->ValPtr, "Thurday, 21-Aug-14 02:15:31 GMT", HTTPc_CFG_HDR_VAL_LEN_MAX);
p_hdr_item->ValLen = Str_Len_N(p_hdr_item->ValPtr, HTTPc_CFG_HDR_VAL_LEN_MAX);
*p_hd = p_hdr_item;
index = 0;
*(CPU_INT08U)p_req->UserDataPtr = index;
return (DEF_YES);
default:
*p_hdr = DEF_NULL;
index = 0;
*(CPU_INT08U)p_req->UserDataPtr = index;
return (DEF_YES);
}
} |
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