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我有一个输出 evbuffer，我想用以下数据填充：

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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                          �4�@�

我正在使用evbuffer_add_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!!!
}

所以我有二进制数据指针（binData）和一个长度（contLen），我如何将它打印到输出缓冲区？

提前谢谢了

4

1 回答 1

2

您不能使用evbuffer_add_printf. 试用evbuffer_add功能：

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);
}

找不到好的文档，除了源代码，我见过的最好的文档是：

http://transmission.sourcearchive.com/documentation/1.75/event_8h_b652a2f82d23509713258a6e44697164.html#b652a2f82d23509713258a6e44697164

 int evbuffer_add   (   struct evbuffer *   ,
    const void *    ,
    size_t           
)

将数据附加到 evbuffer 的末尾。

参数：

    buf     the event buffer to be appended to
    data    pointer to the beginning of the data buffer
    datlen  the number of bytes to be copied from the data buffer
于 2011-12-06T12:48:39.567 回答