Question

我真的很喜欢这个。我已经看过如何使用libcurl下载和写入数据到文件的示例，但我不知道如何将它们写入数组

这是我到目前为止的代码：

static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
{

int written = fwrite(ptr, size, nmemb, (FILE *)stream);
return written;
}

int main(void)
{
CURL *curl_handle;
FILE *bodyfile;
static const char *headerfilename = "head.out";
FILE *headerfile;
static const char *bodyfilename = "body.out";

curl_global_init(CURL_GLOBAL_ALL);

/* init the curl session */
curl_handle = curl_easy_init();

/* set URL to get */
curl_easy_setopt(curl_handle, CURLOPT_URL,"http://example.com/");
/* no progress meter please */
curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, 1L);

/* send all data to this function  */
curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_data);

/* open the files */
headerfile = fopen(headerfilename,"w");
if (headerfile == NULL) {
    curl_easy_cleanup(curl_handle);
    return -1;
}
bodyfile = fopen(bodyfilename,"w");
if (bodyfile == NULL) {
    curl_easy_cleanup(curl_handle);
    return -1;
}

/* we want the headers to this file handle */
curl_easy_setopt(curl_handle,   CURLOPT_WRITEHEADER, headerfile);

/* we want the body to this file handle */
curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, bodyfile);

/* get it! */
curl_easy_perform(curl_handle);

/* close the header file */
fclose(headerfile);
fclose(bodyfile);
return 0;
}

Answer 1

看来，libcurl documentation：

中描述了您需要的内容

CURLOPT_WRITEFUNCTION

应与以下原型匹配的函数指针：size_t   function（char * ptr，size_t size，size_t nmemb，void * userdata）;这个   一旦收到数据，libcurl就会调用函数   需要保存。 [...]

那就是你必须用签名

来实现一个功能

size_t my_array_write(char *ptr, size_t size, size_t nmemb, void *userdata);

并将其传递给curl：

curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, my_array_write);

但是，我还没有测试过（我不知道有一种更简单的方法来实现这一点）。有关详细信息，请参阅libcurl docs。

Libcurl将数据写入数组

1 个答案: