学步园

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<sys/stat.h>

#include<unistd.h>

#define MAX_FILE_LEN  (1024*30)

#define DOWNLOAD_FILE_PATH
"/works/config/"

#define DOWNLOAD_FILE_NAME
"SWConf.ini"

int main(){

FILE *fp;

char filebuf[MAX_FILE_LEN];

char cmd[512];

struct stat sb;

sprintf(cmd, "%s%s", DOWNLOAD_FILE_PATH, DOWNLOAD_FILE_NAME);

stat(cmd, &sb); //取待下载文件的大小

//输出HTTP头信息，输出附加下载文件、文件长度以及内容类型

printf("Content-Disposition:attachment;filename=%s", DOWNLOAD_FILE_NAME);

printf("\r\n"); 

printf("Content-Length:%d", sb.st_size);

printf("\r\n");

//
printf("Content-Type:application/octet-stream %c%c", 13,10); (ascii:"13--\r", "10--\n") 与下一行等同

printf("Content-Type:application/octet-stream\r\n");

printf("\r\n");

sprintf(cmd, "%s%s", DOWNLOAD_FILE_PATH, DOWNLOAD_FILE_NAME);

if(fp=fopen(cmd, "r+b")){  

//成功打开文件，读取文件内容

do{

int rs = fread(filebuf, 1, sizeof(filebuf), fp);

fwrite(filebuf, rs, 1, stdout);

}while(!feof(fp));

fclose(fp);

}

return 1;

}

html中代码的一部分是：超链接。

<tr>

<th>文件下载：</th>

<td>
<a href="/cgi-bin/download">文件下载</a>

</td>

</tr>

html中代码的一部分是：button。

$('#swdownload').click(function(){

location.href="/cgi-bin/download";

});

<tr>

<th>文件下载：</th>

<td>

<input type="button" id="swdownload" value="下载">

</td>

</tr>