绘制时防止闪烁

这不应该是一个答案，但我不能在评论中发布代码：

您的代码中有许多GDI泄漏。

复制/粘贴以下代码，如果闪烁减少，则向我们报告：

void DrawBox(int x, int y, int r, int g, int b, int size, int thickness)
{
    // Brush style to hollow
    m_LogBrush.lbStyle = BS_NULL;
    // Create a logical brush and select into the context
    m_hBrush = CreateBrushIndirect(&m_LogBrush);
    HBRUSH hbrOldBrush = SelectObject(m_hDC, m_hBrush);
    // Create a logical pen and select into the context
    m_hPen = CreatePen(PS_SOLID, thickness, RGB(r, g, b));
    HPEN hpOldPen = SelectObject(m_hDC, m_hPen);
    // Draw the rectangle
    Rectangle(m_hDC, (x - size / 2), (y - size / 2), (x + size / 2), (y + size / 2));
    // Remove the object
    SelectObject(m_hDC, hbrOldBrush);  // first you must restore DC to original state
    SelectObject(m_hDC, hpOldPen);     // same here
    DeleteObject(m_hBrush);
    DeleteObject(m_hPen);

}

在MSDN上阅读有关GDI泄漏的信息。

这应该会减少闪烁，但要完全消除闪烁，您应该执行以下操作：

• 从窗口类定义中删除CS_VREDRAW | CS_HREDRAW
• 在窗口过程中返回1L（或在对话框过程中返回TRUE）以响应WM_ERASEBKGND
• 在内存位图上绘制所有内容，然后将其BitBlt写入m_hDC->，这称为双缓冲（您可以在网上找到许多示例）

    /*Hi You May Change Your Code To This*/ 
    LOGBRUSH m_LogBrush;
    //HBRUSH m_hBrush;
    //HPEN m_hPen;
    //HDC m_hDC;
    HWND m_hWND; //Your WindowHandle instead of your DC
    //
    void DrawBox(int x, int y, int r, int g, int b, int size, int thickness)
    {
    // Lock & Get Forground DC From m_hWND
    HDC m_hDC = GetDC(m_hWND);
    if (m_hDC != 0) //Make Sure It's ok
    {
    // Double Buffering Begins Here
    // Create Background DC From m_hDC
    HDC mem_m_hDC = CreateCompatibleDC(m_hDC);
    // Calculate Window Bounds
    RECT ClientRect = { 0 };
    GetClientRect(m_hWND, &ClientRect);
    // Create Background Buffer Frame
    BITMAPINFO bmi = { 0 };
    bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    bmi.bmiHeader.biWidth = ClientRect.right - ClientRect.left;
    bmi.bmiHeader.biHeight = ClientRect.bottom - ClientRect.top;
    bmi.bmiHeader.biBitCount = 32;
    bmi.bmiHeader.biCompression = BI_RGB;
    bmi.bmiHeader.biPlanes = 1;
    HBITMAP memBMP = CreateDIBSection(mem_m_hDC, &bmi, DIB_RGB_COLORS, 0, 0, 0);
    // Select Background Buffer Frame
    SelectObject(mem_m_hDC, memBMP);
    // Brush style to hollow
    m_LogBrush.lbStyle = BS_NULL;
    // Create a logical brush and select into the context
    HBRUSH m_hBrush = CreateBrushIndirect(&m_LogBrush);
    HGDIOBJ oldHGDIOBJ1 = SelectObject(m_hDC, m_hBrush); //Save Old Seleteed GDI Object To oldHGDIOBJ1
    // Create a logical pen and select into the context
    HPEN m_hPen = CreatePen(PS_SOLID, thickness, RGB(r, g, b));
    HGDIOBJ oldHGDIOBJ2 = SelectObject(m_hDC, m_hPen); //Save Old Seleteed GDI Object To oldHGDIOBJ2
    // Draw the rectangle in Background Memory DC
    Rectangle(mem_m_hDC, (x - size / 2), (y - size / 2), (x + size / 2), (y + size / 2));
    // Copy Background DC To Forground DC
    BitBlt(m_hDC, 0, 0, bmi.bmiHeader.biWidth, bmi.bmiHeader.biHeight, mem_m_hDC, 0, 0, SRCCOPY);
    // Delete Background Buffer Frame
    DeleteObject(memBMP);
    // Delete Background DC
    DeleteDC(mem_m_hDC);
    // Double Buffering Ends Here
    // Unlock Forground DC
    ReleaseDC(m_hWND, m_hDC);
    // Remove the objects
    DeleteObject(m_hBrush);
    DeleteObject(m_hPen);
    }
    }