c++ - Understanding BufferStruct + WriteMemoryCallback -

- 

struct bufferstruct { char * buffer; size_t size; };  // function pass lc, writes output bufferstruct static size_t writememorycallback (void *ptr, size_t size, size_t nmemb, void *data) { size_t realsize = size * nmemb;  struct bufferstruct * mem = (struct bufferstruct *) data;  mem->buffer = realloc(mem->buffer, mem->size + realsize + 1);  if ( mem->buffer ) { memcpy( &( mem->buffer[ mem->size ] ), ptr, realsize ); mem->size += realsize; mem->buffer[ mem->size ] = 0; } return realsize; }

i found here

what trying here? espacially multiplying size_t's? trying show how export html code file. why necesarry write complex (for me) function that? if can explain or post source can me understand :)

this code below "c" way of doing it.. libcurl c library (there c++ wrappers well):

struct bufferstruct {     char* buffer;     size_t size; };  static size_t writememorycallback(void *ptr, size_t size, size_t nmemb, void *data) {     size_t realsize = size * nmemb;  //size size of buffer. nmemb size of each element of buffer.     //thus  realsize = size * sizeof(each_element).      //example:  size_t realsize = size * sizeof(char)  or size_t realsize = size * sizeof(wchar_t)     //again: size buffer size , char or wchar_t element size.      struct bufferstruct* mem = (struct bufferstruct*) data;      //resize buffer hold old data + new data.     mem->buffer = realloc(mem->buffer, mem->size + realsize + 1);       if (mem->buffer)     {         memcpy(&(mem->buffer[mem->size]), ptr, realsize); //copy new data buffer.         mem->size += realsize; //update size of buffer.         mem->buffer[mem->size] = 0; //null terminate buffer/string.     }     return realsize; }

that "c" way of doing things..

the c++ way shown below:

static size_t writememorycallback(void *ptr, size_t size, size_t nmemb, void *data) {     size_t realsize = size * nmemb;      std::string* mem = reinterpret_cast<std::string*>(data);     mem->append(static_cast<char*>(data), realsize);      return realsize; }

then somewhere in code do:

std::string data; //create std::string.. curl_easy_setopt(curl_handle, curlopt_writefunction, writememorycallback); //set callback. curl_easy_setopt(curl_handle, curlopt_writedata, &data); //pass string data pointer.

Comments

Post a Comment

Popular posts from this blog

python - mat is not a numerical tuple : openCV error -

-
i have write down code showing error ma not getting it: please help: showing mat not numerical tuple: import cv import cv2 capture = cv2.videocapture("j.3gp") while(1): _, frame1 = capture.read() grayimage1 = cv2.cvtcolor(frame1, cv2.color_bgr2gray) _, frame2 = capture.read() grayimage2 = cv2.cvtcolor(frame2, cv2.color_bgr2gray) differenceimage = cv2.absdiff(grayimage1,grayimage2) thresholdimage = cv2.threshold(differenceimage,25,255,cv2.thresh_binary) cv2.imshow("difference image", differenceimage) cv2.imshow("threshold image", thresholdimage) cv2.imshow("image", frame1) k = cv2.waitkey(30) & 0xff error arising : ----------------------------------------------------------------------------------------- traceback (most recent call last): file "desk.py", line 15, in <module> cv2.imshow("threshold image", thresholdimage) typeerror: mat not numerical tuple ...
Read more

c# - MSAA finds controls UI Automation doesn't -

-
i'm working on automating windows application. i'm using teststack white framework. i've hit problem. program has 'window' object cannot see inside of. white shows no controls inside of it. inspect.exe shows no controls inside of either when running in ui automation mode. if switch inspect msaa see controls inside fine. there anyway me use msaa c# handle on these controls? if can identify msaa functions need, can use p/invoke call them c#. here's example article doing msaa: http://www.codeproject.com/articles/38906/ui-automation-using-microsoft-active-accessibility also, pinvoke.net can used identify iaccessible (msaa) functions: http://www.pinvoke.net/search.aspx?search=iaccessible&namespace=[all] here's answer along lines: msaa com-based? finally, alternative p/invoke, might able use tlbimp.exe create wrapper assembly oleacc.dll, , access msaa functions through it. i'm not sure if works msaa, it's worth try. as e...
Read more

wordpress - .htaccess: RewriteRule: bad flag delimiters -

-
pulling hair out on one. have following .htaccess file custom redirects in addition wordpress's default settings. when tested on local wamp server worked fine after moving production i'm not getting rewriterule: bad flag delimiters error in server log , after while site goes down internal server error any appreciated. in advance! <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^rockford_weddings___welcome\.html$ /wedding/ [r=301,l] rewriterule ^blog/?$ /journal/ [r=301,l] rewriterule ^blog/(.*)$ /$1 [r=301,l] rewriterule ^portraitinvestment/?$ /portraitinvestment\.pdf [r=301,l] rewriterule ^weddinginvestment/?$ /weddinginvestment\.pdf [r=301,l] rewriterule ^holidaycards2014/?$ /holidaycards2014\.pdf [r=301,l] </ifmodule> # begin wordpress <ifmodule mod_rewrite.c> rewriteengine on rewritebase / rewriterule ^index\.php$ - [l] rewritecond %{request_filename} !-f rewritecond %{request_filename} !-d rewriterule . /index.php [l] </...
Read more