C&;Libevent:将二进制数据添加到输出缓冲区
我有一个输出evbuffer,我想用以下数据填充它:C&;Libevent:将二进制数据添加到输出缓冲区,c,binary,buffer,libevent,C,Binary,Buffer,Libevent,我有一个输出evbuffer,我想用以下数据填充它: HTTP/1.1 200 OK Date: Tue, 06 Dec 2011 10:35:08 GMT Server: Apache/2.2.14 (Ubuntu) X-Powered-By: PHP/5.3.2-1ubuntu4.9 Vary: Accept-Encoding Content-Encoding: gzip Content-Length: 48 Content-Type: text/html ��(�ͱ���I�O����H
HTTP/1.1 200 OK
Date: Tue, 06 Dec 2011 10:35:08 GMT
Server: Apache/2.2.14 (Ubuntu)
X-Powered-By: PHP/5.3.2-1ubuntu4.9
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 48
Content-Type: text/html
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我使用的是evbuffer\u add\u printf(…)
我有以下C回调函数:
static void echo_read_cb(struct bufferevent *bev, void *ctx){
/* This callback is invoked when there is data to read on bev. */
struct evbuffer *input = bufferevent_get_input(bev);
struct evbuffer *output = bufferevent_get_output(bev);
...
char* response=NULL;
response=applyGetReq(url,data,len);
int contLen=0;
contLen=getContentLength(response);
char* binData=strstr(response,"\r\n\r\n");
binData=binData+strlen("\r\n\r\n");
fwrite(binData,sizeof(char),contLen,stdout);
printf("\n");
evbuffer_add_printf(output,"%s",binData); //I want to print binData as binary, not printf!!!
}
int
evbuffer_add(struct evbuffer *buf, const void *data, size_t datlen)
{
size_t need = buf->misalign + buf->off + datlen;
size_t oldoff = buf->off;
if (buf->totallen < need) {
if (evbuffer_expand(buf, datlen) == -1)
return (-1);
}
memcpy(buf->buffer + buf->off, data, datlen);
buf->off += datlen;
if (datlen && buf->cb != NULL)
(*buf->cb)(buf, oldoff, buf->off, buf->cbarg);
return (0);
}
所以我有二进制数据指针(binData)和长度(contLen),如何将其打印到输出缓冲区
非常感谢您使用
evbuffer\u add\u printf
无法安全地添加二进制数据。尝试evbuffer\u添加功能:
static void echo_read_cb(struct bufferevent *bev, void *ctx){
/* This callback is invoked when there is data to read on bev. */
struct evbuffer *input = bufferevent_get_input(bev);
struct evbuffer *output = bufferevent_get_output(bev);
...
char* response=NULL;
response=applyGetReq(url,data,len);
int contLen=0;
contLen=getContentLength(response);
char* binData=strstr(response,"\r\n\r\n");
binData=binData+strlen("\r\n\r\n");
fwrite(binData,sizeof(char),contLen,stdout);
printf("\n");
evbuffer_add_printf(output,"%s",binData); //I want to print binData as binary, not printf!!!
}
int
evbuffer_add(struct evbuffer *buf, const void *data, size_t datlen)
{
size_t need = buf->misalign + buf->off + datlen;
size_t oldoff = buf->off;
if (buf->totallen < need) {
if (evbuffer_expand(buf, datlen) == -1)
return (-1);
}
memcpy(buf->buffer + buf->off, data, datlen);
buf->off += datlen;
if (datlen && buf->cb != NULL)
(*buf->cb)(buf, oldoff, buf->off, buf->cbarg);
return (0);
}
将数据追加到evbuffer的末尾
参数:
这是evbuffer\u add
本身的源代码,不是用法示例。对我来说,阅读libevent的源代码比查找文档更容易。是的,起初我以为这是一个片段,但从您的链接中,我看到这是源代码本身。非常感谢。对于文档,您可以尝试libevent.org页面上的链接。有些人觉得这本书很有用;还有最新的强氧剂