參考：http://stackoverflow.com/questions/5184988/should-i-use-urldownloadtofile

#include "stdafx.h"
#include <stdio.h>
#include <tchar.h>

#include <windows.h>
#include <Urlmon.h>

#pragma comment(lib,"Urlmon.lib") //加入連結庫

int _tmain(int argc, _TCHAR* argv[])
{
	TCHAR url[] = TEXT("http://a.hiphotos.baidu.com/image/pic/item/1b4c510fd9f9d72a9090781dd62a2834349bbb3e.jpg");

	printf("Url: %S\n", url);

	TCHAR path[MAX_PATH];

	GetCurrentDirectory(MAX_PATH, path);

	wsprintf(path, TEXT("%s\\index.jpg"), path);

	printf("Path: %S\n", path);

	HRESULT res = URLDownloadToFile(NULL, url, path, 0, NULL);

	if (res == S_OK) {
		printf("Ok\n");
	}
	else if (res == E_OUTOFMEMORY) {
		printf("Buffer length invalid, or insufficient memory\n");
	}
	else if (res == INET_E_DOWNLOAD_FAILURE) {
		printf("URL is invalid\n");
	}
	else {
		printf("Other error: %d\n", res);
	}

	return 0;
}