C 程序不显示下载速度和文件大小(卷曲)
我对Ubuntu上的curl有问题。我希望它显示下载速度和下载文件的大小。我已经声明了双倍大小、双倍速度和卷曲。我总是犯错误。程序编译到“文件下载”的那个一刻。它还应该告诉我来自CURLINFO\u SIZE\u下载和CURLINFO\u SPEED\u下载的信息。请帮忙C 程序不显示下载速度和文件大小(卷曲),c,curl,download,C,Curl,Download,我对Ubuntu上的curl有问题。我希望它显示下载速度和下载文件的大小。我已经声明了双倍大小、双倍速度和卷曲。我总是犯错误。程序编译到“文件下载”的那个一刻。它还应该告诉我来自CURLINFO\u SIZE\u下载和CURLINFO\u SPEED\u下载的信息。请帮忙 #define CURL_STATICLIB #include <stdio.h> #include <curl/curl.h> #include <string.h> #include &
#define CURL_STATICLIB
#include <stdio.h>
#include <curl/curl.h>
#include <string.h>
#include <stdlib.h>
size_t write_data(void *ptr, size_t size, size_t nmemb, FILE *stream)
{
size_t written;
written = fwrite(ptr, size, nmemb, stream);
return written;
}
int main(void)
{
CURL *curl;
FILE *fp;
CURLcode res;
FILE *stream = stdout;
int x;
char y[1024];
double* sized;
double* speedd;
char* name = calloc(1, 1024);
char* outfilename;
char* path_pdf = "/home/user/Desktop/%s.pdf";
char* path_jpg = "/home/user/Desktop/%s.jpg";
char* path_txt = "/home/user/Desktop/%s.txt";
char* path_mp3 = "/home/user/Desktop/%s.mp3";
char* path_avi = "/home/user/Desktop/%s.avi";
printf("Enter file url: \n"); // for example http://oi58.tinypic.com/15nk3de.jpg
scanf ("%s",y);
char *url = y;
printf("Type name of file \n");
scanf("%s",name);
char *result_pdf = malloc(strlen(path_pdf) - 2 + strlen(name) + 1);
sprintf(result_pdf, path_pdf, name);
char *result_jpg = malloc(strlen(path_jpg) - 2 + strlen(name) + 1);
sprintf(result_jpg, path_jpg, name);
char *result_txt = malloc(strlen(path_txt) - 2 + strlen(name) + 1);
sprintf(result_txt, path_txt, name);
char *result_mp3 = malloc(strlen(path_mp3) - 2 + strlen(name) + 1);
sprintf(result_mp3, path_mp3, name);
char *result_avi = malloc(strlen(path_avi) - 2 + strlen(name) + 1);
sprintf(result_avi, path_avi, name);
printf("Choose type of file:\n [0] - pdf\n [1] - jpg\n [2] - txt\n [3] - mp3\n [4] - avi\n "); //choose 1
scanf("%d",&x);
switch(x){
case 0:
outfilename = result_pdf;
break;
case 1:
outfilename = result_jpg;
break;
case 2:
outfilename = result_txt;
break;
case 3:
outfilename = result_mp3;
break;
case 4:
outfilename = result_avi;
break;
}
curl = curl_easy_init();
if (curl)
{
fp = fopen(outfilename,"wb");
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
printf("Download started!\n\n");
curl_easy_setopt (curl, CURLOPT_VERBOSE, 1L);
res = curl_easy_perform(curl);
if(res == CURLE_OK) {
printf("File downloaded!\n\n");}
else {
printf("Transfer failed!");}
curl_easy_getinfo(curl,CURLINFO_SIZE_DOWNLOAD,&sized);
fprintf(stream,"%.3f \n", sized);
curl_easy_getinfo(curl,CURLINFO_SPEED_DOWNLOAD,&speedd);
fprintf(stream, "%.3f \n", speedd);
curl_easy_cleanup(curl);
fclose(fp);
}
return 0;
}
#定义CURL\u STATICLIB
#包括
#包括
#包括
#包括
大小写入数据(void*ptr、大小、大小nmemb、文件*流)
{
书写的大小;
写入=写入(ptr、大小、nmemb、流);
书面回报;
}
内部主(空)
{
卷曲*卷曲;
文件*fp;
卷曲编码;
文件*stream=stdout;
int x;
chary[1024];
双倍*尺寸;
双倍*速度;
char*name=calloc(1024);
字符*输出文件名;
char*path_pdf=“/home/user/Desktop/%s.pdf”;
char*path_jpg=“/home/user/Desktop/%s.jpg”;
char*path_txt=“/home/user/Desktop/%s.txt”;
char*path_mp3=“/home/user/Desktop/%s.mp3”;
char*path_avi=“/home/user/Desktop/%s.avi”;
printf(“输入文件url:\n”);//例如http://oi58.tinypic.com/15nk3de.jpg
scanf(“%s”,y);
char*url=y;
printf(“文件类型名称”);
scanf(“%s”,名称);
char*result\u pdf=malloc(strlen(path\u pdf)-2+strlen(name)+1);
sprintf(结果、路径、名称);
char*result\u jpg=malloc(strlen(path\u jpg)-2+strlen(name)+1);
sprintf(结果、路径、名称);
char*result_txt=malloc(strlen(path_txt)-2+strlen(name)+1);
sprintf(结果文本、路径文本、名称);
char*result\u mp3=malloc(strlen(path\u mp3)-2+strlen(name)+1);
sprintf(结果、路径、名称);
char*result_avi=malloc(strlen(path_avi)-2+strlen(name)+1);
sprintf(结果、路径、名称);
printf(“选择文件类型:\n[0]-pdf\n[1]-jpg\n[2]-txt\n[3]-mp3\n[4]-avi\n”);//选择1
scanf(“%d”和&x);
开关(x){
案例0:
outfilename=结果\ uPDF;
打破
案例1:
outfilename=结果_jpg;
打破
案例2:
outfilename=result_txt;
打破
案例3:
outfilename=结果\u mp3;
打破
案例4:
outfilename=结果_avi;
打破
}
curl=curl_easy_init();
if(curl)
{
fp=fopen(出口名称,“wb”);
curl_easy_setopt(curl,CURLOPT_URL,URL);
curl\u easy\u setopt(curl,CURLOPT\u WRITEFUNCTION,write\u data);
curl_easy_setopt(curl,CURLOPT_WRITEDATA,fp);
printf(“下载已开始!\n\n”);
卷曲度(卷曲度,卷曲度(1L));
res=旋度(curl)\u容易执行(curl);
如果(res==CURLE\u OK){
printf(“已下载文件!\n\n”);}
否则{
printf(“传输失败!”;}
curl\u easy\u getinfo(curl、CURLINFO\u SIZE\u下载和调整大小);
fprintf(流,“%.3f\n”,大小);
curl\u easy\u getinfo(curl、CURLINFO\u SPEED\u下载和speedd);
fprintf(流“%.3f\n”,speedd);
旋度\轻松\清洁(旋度);
fclose(fp);
}
返回0;
}
您在问题中提供的代码有几个问题:
stdlib.h
名称
未分配scanf(3)
读取路径名时,它会尝试将其存储到name
引用的内存位置。由于name
未初始化,指针的值未定义。这会导致分段错误
为name
分配内存,或者将类型从指针更改为大小适当的数组
char *name = calloc(1, 1024);
printf("Type name of file \n");
scanf("%s",name);
或
这两种方法都能很好地满足您的需要。但是,请注意,这些方法会引入堆或堆栈溢出错误,因为scanf(3)
不执行边界检查。这类事情的通常模式是使用fgets(3)
读取一行输入,并使用sscanf(3)
标记它。在这种情况下,您实际上只需要fgets(3)
不要使用获取(3)
if (res == CURLE_OK) {
printf("File downloaded!\n\n");
} else {
printf("Transfer failed!");}
curl_easy_getinfo(curl,CURLINFO_SIZE_DOWNLOAD,sized);
curl_easy_getinfo(curl,CURLINFO_SPEED_DOWNLOAD,speedd);
curl_easy_cleanup(curl);
fclose(fp);
}
相反,我认为你的意思是:
if (res == CURLE_OK) {
printf("File downloaded!\n\n");
} else {
printf("Transfer failed!");}
}
curl_easy_getinfo(curl,CURLINFO_SIZE_DOWNLOAD,sized);
curl_easy_getinfo(curl,CURLINFO_SPEED_DOWNLOAD,speedd);
curl_easy_cleanup(curl);
fclose(fp);
我冒昧地猜测这个问题的原因是因为您的代码风格。看起来您至少是C语言的新手。使用一致的风格编写代码将提高代码的可读性,并帮助您避免类似的错误。你用什么样的风格并不重要,只要你坚持下去
getopt(3)
手册页。您可能会发现,一旦您这样做,您的程序的大小将缩小约一半
较小的程序是更好的程序
curl\u easy\u getinfo
double* sized;
double* speedd;
但没有为这些提供存储。当您调用curl\u easy\u getinfo
时,它会崩溃。您在评论中提到,您通过将地址传递到curl\u easy\u getinfo
解决了这个问题。这将停止崩溃,因为您已经为地址提供了存储。然而,如果你试图打印这些信息,你要么一无所获,要么再次崩溃
相反,您想要的是:
double sized;
double speedd;
...
curl_easy_getinfo(curl,CURLINFO_SIZE_DOWNLOAD,&sized);
curl_easy_getinfo(curl,CURLINFO_SPEED_DOWNLOAD,&speedd);
double sized;
double speedd;
...
curl_easy_getinfo(curl,CURLINFO_SIZE_DOWNLOAD,&sized);
curl_easy_getinfo(curl,CURLINFO_SPEED_DOWNLOAD,&speedd);
printf("Size: %g KB\nSpeed: %g KB/s\n", sized / 1024., speedd / 1024.);
Enter file url:
http://oi58.tinypic.com/15nk3de.jpg
Type name of file
foo.jpg
Choose type of file:
[0] - pdf
[1] - jpg
[2] - txt
[3] - mp3
[4] - avi
1
Download started!
* Hostname was NOT found in DNS cache
* Trying 209.17.68.209...
* Connected to oi58.tinypic.com (209.17.68.209) port 80 (#0)
> GET /15nk3de.jpg HTTP/1.1
Host: oi58.tinypic.com
Accept: */*
< HTTP/1.1 200 OK
* Server Apache is not blacklisted
< Server: Apache
< Last-Modified: Thu, 13 Feb 2014 19:51:01 GMT
< ETag: "1d7a5-4f24f024dc8be"
< Cache-Control: max-age=21600
< Expires: Sun, 04 Jan 2015 00:02:56 GMT
< Content-Type: image/jpeg
< Content-Length: 120741
< Accept-Ranges: bytes
< Date: Sat, 03 Jan 2015 19:24:19 GMT
< X-Varnish: 1269536769 1268437896
< Age: 4883
< Via: 1.1 varnish
< Connection: keep-alive
< X-Varnish-Server: den2tpv65
< X-Cache: HIT
<
* Connection #0 to host oi58.tinypic.com left intact
File downloaded!
Size: 117.911 KB
Speed: 169.138 KB/s