Imgui顯示中文

#include <windows.h>
#include <winnls.h>
#include <iostream>

std::string utf8_to_string(const std::string& str)
{
	int nwLen = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, NULL, 0);
	wchar_t* pwBuf = new wchar_t[nwLen + 1];
	memset(pwBuf, 0, nwLen * 2 + 2);
	MultiByteToWideChar(CP_UTF8, 0, str.c_str(), str.length(), pwBuf, nwLen);

	int nLen = WideCharToMultiByte(CP_ACP, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
	char* pBuf = new char[nLen + 1];
	memset(pBuf, 0, nLen + 1);
	WideCharToMultiByte(CP_ACP, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);

	std::string ret = pBuf;
	delete[]pBuf;
	delete[]pwBuf;

	return ret;
}

std::string string_to_utf8(const std::string& str)
{
	int nwLen = MultiByteToWideChar(CP_ACP, 0, str.c_str(), -1, NULL, 0);
	wchar_t* pwBuf = new wchar_t[nwLen + 1];
	memset(pwBuf, 0, nwLen * 2 + 2);
	MultiByteToWideChar(CP_ACP, 0, str.c_str(), str.length(), pwBuf, nwLen);

	int nLen = WideCharToMultiByte(CP_UTF8, 0, pwBuf, -1, NULL, NULL, NULL, NULL);
	char* pBuf = new char[nLen + 1];
	memset(pBuf, 0, nLen + 1);
	WideCharToMultiByte(CP_UTF8, 0, pwBuf, nwLen, pBuf, nLen, NULL, NULL);

	std::string ret = pBuf;
	delete[]pwBuf;
	delete[]pBuf;

	return ret;
}

//imgui顯示中文測試代碼
void show_chinese()
{
	ImGui::Text(string_to_utf8("顯示中文").c_str());
}

我自己實際代碼:

實際顯示得效果圖:

可以看到，我轉化的字符串 "CSGO遊戲輔助" 能夠正常顯示,不需要字符串前面加上那可惡的u8;