multi-debugcallback.c
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上传日期:2018-10-23
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文件大小:4k
- /*****************************************************************************
- * _ _ ____ _
- * Project ___| | | | _ | |
- * / __| | | | |_) | |
- * | (__| |_| | _ <| |___
- * ___|___/|_| ______|
- *
- * $Id: multi-debugcallback.c,v 1.4 2008-05-22 21:20:09 danf Exp $
- *
- * This is a very simple example using the multi interface and the debug
- * callback.
- */
- #include <stdio.h>
- #include <string.h>
- /* somewhat unix-specific */
- #include <sys/time.h>
- #include <unistd.h>
- /* curl stuff */
- #include <curl/curl.h>
- typedef char bool;
- #define TRUE 1
- static
- void dump(const char *text,
- FILE *stream, unsigned char *ptr, size_t size,
- bool nohex)
- {
- size_t i;
- size_t c;
- unsigned int width=0x10;
- if(nohex)
- /* without the hex output, we can fit more on screen */
- width = 0x40;
- fprintf(stream, "%s, %zd bytes (0x%zx)n", text, size, size);
- for(i=0; i<size; i+= width) {
- fprintf(stream, "%04zx: ", i);
- if(!nohex) {
- /* hex not disabled, show it */
- for(c = 0; c < width; c++)
- if(i+c < size)
- fprintf(stream, "%02x ", ptr[i+c]);
- else
- fputs(" ", stream);
- }
- for(c = 0; (c < width) && (i+c < size); c++) {
- /* check for 0D0A; if found, skip past and start a new line of output */
- if (nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
- i+=(c+2-width);
- break;
- }
- fprintf(stream, "%c",
- (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
- /* check again for 0D0A, to avoid an extra n if it's at width */
- if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
- i+=(c+3-width);
- break;
- }
- }
- fputc('n', stream); /* newline */
- }
- fflush(stream);
- }
- static
- int my_trace(CURL *handle, curl_infotype type,
- char *data, size_t size,
- void *userp)
- {
- const char *text;
- (void)handle; /* prevent compiler warning */
- switch (type) {
- case CURLINFO_TEXT:
- fprintf(stderr, "== Info: %s", data);
- default: /* in case a new one is introduced to shock us */
- return 0;
- case CURLINFO_HEADER_OUT:
- text = "=> Send header";
- break;
- case CURLINFO_DATA_OUT:
- text = "=> Send data";
- break;
- case CURLINFO_HEADER_IN:
- text = "<= Recv header";
- break;
- case CURLINFO_DATA_IN:
- text = "<= Recv data";
- break;
- }
- dump(text, stderr, data, size, TRUE);
- return 0;
- }
- /*
- * Simply download a HTTP file.
- */
- int main(int argc, char **argv)
- {
- CURL *http_handle;
- CURLM *multi_handle;
- int still_running; /* keep number of running handles */
- http_handle = curl_easy_init();
- /* set the options (I left out a few, you'll get the point anyway) */
- curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.haxx.se/");
- curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace);
- curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L);
- /* init a multi stack */
- multi_handle = curl_multi_init();
- /* add the individual transfers */
- curl_multi_add_handle(multi_handle, http_handle);
- /* we start some action by calling perform right away */
- while(CURLM_CALL_MULTI_PERFORM ==
- curl_multi_perform(multi_handle, &still_running));
- while(still_running) {
- struct timeval timeout;
- int rc; /* select() return code */
- fd_set fdread;
- fd_set fdwrite;
- fd_set fdexcep;
- int maxfd;
- FD_ZERO(&fdread);
- FD_ZERO(&fdwrite);
- FD_ZERO(&fdexcep);
- /* set a suitable timeout to play around with */
- timeout.tv_sec = 1;
- timeout.tv_usec = 0;
- /* get file descriptors from the transfers */
- curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
- /* In a real-world program you OF COURSE check the return code of the
- function calls, *and* you make sure that maxfd is bigger than -1
- so that the call to select() below makes sense! */
- rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
- switch(rc) {
- case -1:
- /* select error */
- still_running = 0;
- printf("select() returns error, this is badnessn");
- break;
- case 0:
- default:
- /* timeout or readable/writable sockets */
- while(CURLM_CALL_MULTI_PERFORM ==
- curl_multi_perform(multi_handle, &still_running));
- break;
- }
- }
- curl_multi_cleanup(multi_handle);
- curl_easy_cleanup(http_handle);
- return 0;
- }