如何提高下载速度HttpSendFile

yyx_attach

我写了一个web，需要下载一个文件，首先把这个文件拼装好，然后调用HttpSendFile(T_HTTP_SERVER *http, char *str, int len, char *name, char *type)
实现下载功能。
但是发现拼装这个文件也需要10几分钟时间，所以想能不能边拼装文件，边下载。
应该怎么实现呀？
请各位老大指导！

1. HttpSendFile(T_HTTP_SERVER *http, char *str, int len, char *name, char *type)
   
2. {
   
3.     HttpSetContent(http, 0);
   
4.     HttpSetContent(http, "HTTP/1.1 200 OK\r\n");
   
5.     HttpSetContent(http, "Content-Disposition: attachment; filename=");
   
6.     HttpSetContent(http, name);
   
7.     HttpSetContent(http, "\r\n");
   
8.     HttpSetContent(http, "Content-Type: ");
   
9.     HttpSetContent(http, type);
   
10.     HttpSetContent(http, "\r\n");
    
11.     HttpSetContentLen(http, "Content-Length: ", len);
    
12.     HttpSetContent(http, "\r\n");
    
13.     HttpSendContent(http, str, len);

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