curl：如何限制GET的大小？ [英] curl: How to limit size of GET?

问题描述

我想从带有curl的URL中检索前10k个字节（在我的例子中使用PHP）。有没有办法指定这个？我认为CURLOPT_BUFFERSIZE会做到这一点，但它只是看起来确定一个缓冲区的大小，直到所有的内容都被检索。

I want to retrieve the first 10k bytes from a URL with curl (using PHP in my case). Is there a way to specify this? I thought CURLOPT_BUFFERSIZE would do this, but it just appears to determine the size of a buffer that is reused until all of the content is retrieved.

推荐答案

这是我在c ++中做的

This is how i do it in c++

int offset = 0;
int size = 10*1024;

char range[256];
curl_slist_s *pHeaders = NULL;
snprintf(range, 256, "Range: bytes=%d-%d", offset, offset+size-1);

pHeaders = curl_slist_append(pHeaders, range);
curl_easy_setopt(pCurlHandle, CURLOPT_HTTPHEADER, pHeaders);

curl_slist_free_all(pHeaders);
pHeaders = NULL;

编辑：刚刚发现你的意思是在php。

Just found out you meant in php. Ill see if i can find out how to port it.

想想这应该可以在php中使用：

Think this should work in php:

$offset = 0;
$size = 10*1024;

$a = $offset;
$b = $offset + $size-1;

curl_easy_setopt(curlHandle, CURLOPT_HTTPHEADER, array("Range: bytes=$a-$b") );

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