使用lincurl下载的图片为什么打不开

#include <stdio.h>
#include <curl/curl.h>
#include<string>
#include<sqlite3.h>
#include<iostream>
#include<fstream>
#include<vector>
#include<Windows.h>
using namespace std;
//写入函数

static size_t get_count();
size_t write_data(void *ptr, size_t size, size_t count,char *stream)
{
memcpy(stream,ptr,get_count()/sizeof(char));
//printf("%s",ptr);
return count;}

//获取应下载文件大小
size_t save_data(void *ptr, size_t size , size_t count,char *stream)
{
return count*size;
}

static size_t get_count(){
CURL *curl;
CURLcode res;
res=curl_global_init(CURL_GLOBAL_WIN32);
double filesize=0;
curl_global_init(CURL_GLOBAL_ALL);
curl = curl_easy_init();
if (curl) {
res=curl_easy_setopt(curl, CURLOPT_URL, "http://cdn.duitang.com/uploads/item/201111/09/20111109230753_kaeuy.thumb.600_0.jpg");
res=curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);
/* res=curl_easy_setopt(curl, CURLOPT_FILETIME, 1L);*/
res=curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, save_data);
res=curl_easy_setopt(curl, CURLOPT_HEADER, 0L);
//curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

res=curl_easy_perform(curl);

if (res == CURLE_OK) {
res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &filesize);
} else {
filesize = -1;
}
return filesize;
}
}
int main()
{
//初始化
CURLcode res;
res = curl_global_init(CURL_GLOBAL_WIN32);
CURL *curl_handle;
curl_handle = curl_easy_init();
char *zErrMsg = 0;
size_t fsize=0;
fsize = get_count();
char*fp = new char[fsize/sizeof(char)+1];
if(res!=CURLE_OK)
{
std::cerr<<"initialize libcurl failed";
return-1;
}
if(curl_handle!=NULL)
{
res = curl_easy_setopt(curl_handle, CURLOPT_URL, "http://cdn.duitang.com/uploads/item/201111/09/20111109230753_kaeuy.thumb.600_0.jpg" );
res = curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_data);
res = curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, fp);
res = curl_easy_perform(curl_handle);

//读入数据库
sqlite3 *db;
sqlite3_stmt *stat;
int value= sqlite3_open("f:/ceshi/gtestpic.db", &db);
sqlite3_exec(db, "CREATE TABLE list (fliename varchar(128) UNIQUE, fzip blob);", 0, 0, &zErrMsg);
sqlite3_prepare(db, "insert into list values ('download',?);", -1, &stat, 0);
sqlite3_bind_blob(stat,1,fp,fsize/sizeof(char), NULL);
sqlite3_step(stat);

//选取该条数据
char buffer2[111111]="0";
sqlite3_prepare(db, "select*from list;", -1, &stat, 0);
sqlite3_step(stat);
//得到记录中的BLOB字段
const void * test = sqlite3_column_blob(stat, 1);
//得到字段中数据的长度
int size = sqlite3_column_bytes(stat, 1);
//拷贝该字段
sprintf(buffer2, "%s", test);
FILE *fp2;
fp2 = fopen("f:/ceshi/outfile.jpg", "wb");
if(fp2 != NULL)
{
size_t ret = fwrite(test, sizeof(char), size, fp2);
fclose(fp2);
}
//释放资源
delete[]fp;
sqlite3_finalize(stat);
sqlite3_close(db);
}

//释放资源

curl_easy_cleanup(curl_handle);
curl_global_cleanup();


return 0;
}

自己写了一个下载图片数据不经过本地存储直接加载到数据库中的小程序，但是为什么加载到数据库中的文件打不开呢？