【UE4】下载URL图片保存到本地

/*
@author:Ning+
@theme:URL下载图片 2020/04/01
*/
#include "Windows/AllowWindowsPlatformTypes.h"
#include "Windows/PreWindowsApi.h"

#include 
#include 
#include 

#include "Windows/PostWindowsApi.h"
#include "Windows/HideWindowsPlatformTypes.h"

/*
#pragma comment(lib,"urlmon.lib") MS静态链接库：
*/
#pragma comment(lib,"urlmon.lib")
using namespace std;


//从指定URL下载瓦片
bool Uclass::DownLoadIMG(FString URL, FString SaveSource, FString SaveName)
{
	
	string url = TCHAR_TO_UTF8(*URL);
	size_t len = url.length();//获取字符串长度
	int nmlen = MultiByteToWideChar(CP_ACP, 0, url.c_str(), len + 1, NULL, 0);//如果函数运行成功，并且cchWideChar为零，
	//返回值是接收到待转换字符串的缓冲区所需求的宽字符数大小。
	wchar_t* buffer = new wchar_t[nmlen];
	MultiByteToWideChar(CP_ACP, 0, url.c_str(), len + 1, buffer, nmlen);
	
	//转换为ASNI
	string str = TCHAR_TO_UTF8(*SaveSource);
	str = str + TCHAR_TO_UTF8(*SaveName);

	std::wstring widstr = std::wstring(str.begin(), str.end());
	const wchar_t *pwidstr = widstr.c_str();

	HRESULT hr = URLDownloadToFile(NULL, buffer, pwidstr, 0, NULL);

	if (hr == S_OK)
	{
		return true;
	}
	else
	{
		return false;
	}
	
}