操作环境：windwos10 & vs2017 & EasyX Library for C++ (Ver:20220116)

我希望可以在dll中进行绘制，我可以将点坐标传给参数，绘图与保存完全在dll中实现，然后通过接口去调用

在EasyX中，设备分两种，分别做了一种是默认的绘图窗口，另一种是IMAGE对象的测试

在同一台设备相同环境下，我将这段代码在dll导出程序export工程里以dll方式导出，在控制台应用工程load里进行调用时，可以成功执行绘图并保存，

但是执行完后却无法释放dll导致程序阻塞或者崩溃，我猜测可能是在绘图结束后有内存没有释放，但是无法找出问题点在哪里

//windwos10 && vs2017 &&  EasyX Library for C++ (Ver:20220116)
//在EasyX中，设备分两种，分别做了一种是默认的绘图窗口，另一种是IMAGE对象的测试

//工程A 动态导出库ExportApi
//ExportApi.h
#include <vector>
extern "C" __declspec(dllexport)  int  ExportEasyXImg(std::vector<POINT>& points);
extern "C" __declspec(dllexport)  int  ExportEasyXWind(std::vector<POINT>& points);

//ExportApi.cpp
//#include "ExportApi.h"
#include "graphics.h"
extern "C" __declspec(dllexport)  int  ExportEasyXImg(std::vector<POINT>& points)//IMAGE对象
{
	IMAGE img(600, 600);

	SetWorkingImage(&img);

	ellipse(200, 200, 100, 100);
	//polygon(&points[0], points.size());//我希望如此，demo仅作简单测试，并没有传参，但依然有问题

	saveimage(_T("E://ouput.png"), &img);

	return 1;
}
extern "C" __declspec(dllexport)  int  ExportEasyXWind(std::vector<POINT>& points)//默认的绘图窗口
{
	initgraph(640, 600);

	rectangle(200, 200, 100, 100);

	saveimage(_T("wind.png"));

	closegraph();

	return 1;
}

//工程B 控制台应用程序Load
//load.cpp
#include <iostream>
#include <Windows.h>
#include <vector>
using std::cout;
using std::endl;

typedef int(*Func_EasyXImage)(std::vector<POINT>& points);
typedef int(*Func_EasyXWind)(std::vector<POINT>& points);

int LoadApiFunc_EasyXImage()
{
	std::vector<POINT> points;
	HINSTANCE h = LoadLibraryA("ExportApi.dll");
	if (h)
	{
		Func_EasyXImage func_byimage = (Func_EasyXImage)GetProcAddress(h, "ExportEasyXImg");
		if (func_byimage)
		{
			int i_rec = func_byimage(points);
			if (i_rec == 1)
			{
				cout << "load draw by image success!" << endl;
			}
		}
		else
		{
			cout << "ExportEasyXImg Interface is error!" << endl;
		}
	}
	else {
		cout << "load dll error!" << endl;
	}
	FreeLibrary(h);
	//问题是卡在了dll的释放这里
	//应该是EasyX在绘图结束后有内存没有释放掉，但是追不到到底哪里没有释放
	cout << "free dll is success!";
	return 1;
}
int LoadApiFunc_EasyXWind()
{
	std::vector<POINT> points;
	HINSTANCE h = LoadLibraryA("ExportApi.dll");
	if (h)
	{
		Func_EasyXWind func_bywind = (Func_EasyXWind)GetProcAddress(h, "ExportEasyXWind");
		if (func_bywind)
		{
			int i_rec = func_bywind(points);
			if (i_rec == 1)
			{
				cout << "load draw by Wind success!" << endl;
			}
		}
		else
		{
			cout << "ExportEasyXWind Interface is error!" << endl;
		}
	}
	else {
		cout << "load dll error!" << endl;
	}
	FreeLibrary(h);
	//问题也是卡在了dll的释放这里
	cout << "free dll is success!";
	return 1;
}

int main()
{
	int recode = LoadApiFunc_EasyXImage();
	if (recode != 1)
	{
		cout << "FreeDll is error!";
	}
	int recode2 = LoadApiFunc_EasyXWind();
	if (recode2 != 1)
	{
		cout << "FreeDll is error!";
	}
	return 1;
}