构造函数内使用EasyX颜色初始化函数引发异常0xC0000005

Question

环境: Windows 10, VS 2022 (x64).

只要把颜色初始化函数放在类的构造函数里就会引发异常：
0x00007FF6D7085729 处(位于 ProgressBarControl.exe 中)引发的异常: 0xC0000005: 读取位置 0x0000000000000000 时发生访问冲突。

完整代码：

#pragma once

#include <graphics.h>

struct ProgressBarCtrlPosition
{
    int mLeft;
    int mTop;
    int mRight;
    int mBottom;
};

struct ProgressBarCtrlStyles
{
    COLORREF mLineColor;
    COLORREF mBkColor;
    COLORREF mFillColor;
};

class ProgressBarControl
{
public:
    ProgressBarControl(int left, int top, int right, int bottom)
    {
        mPosition.mLeft = left;
        mPosition.mTop = top;
        mPosition.mRight = right;
        mPosition.mBottom = bottom;

        mStyles.mLineColor = BLACK;
        mStyles.mBkColor = WHITE;
        mStyles.mFillColor = LIGHTBLUE;

        setlinecolor(mStyles.mLineColor);
        setbkcolor(mStyles.mBkColor);
        setfillcolor(mStyles.mFillColor);
    }

    void Draw()
    {
        rectangle(mPosition.mLeft, mPosition.mTop, mPosition.mRight, mPosition.mBottom);
        fillrectangle(mPosition.mLeft, mPosition.mTop, mPosition.mRight - 100, mPosition.mBottom);
    }

private:
    ProgressBarCtrlPosition mPosition;
    ProgressBarCtrlStyles mStyles;
};

Answer 1

注意对象的生存期