cgi实现下载文件

#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 "/www/picture/" #define DOWNLOAD_FILE_NAME "1.jpg" int main(){ FILE *fp; char filebuf[MAX_FILE_LEN]; char cmd[65535]; 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\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; }