CefSharp在高DPI的屏幕上出现黑边（winform）

目录

• 问题现象
• 解决办法
  • 1.将cefsharp的gpu设置为无效，（后遗症，h5动画会出现卡顿现象，慎用）
  • 2.将屏幕的DPI置为96（缩放比例为100%）（后遗症，不可能每个电脑都去配置）
  • 3.支持高DPI（后遗症，winform窗体会缩放）
  • 4.（采用）让整个程序支持高DPI

 

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问题现象

如图所示：在高DPI（168） 缩放比例为：175%的配置下，，cefsharp控件的左侧和上部出现黑边

（电脑配置图）

 

（问题图）

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解决办法

1.将cefsharp的gpu设置为无效，（后遗症，h5动画会出现卡顿现象，慎用）

var settings = new CefSettings();
settings.Locale = "zh-CN";
settings.CefCommandLineArgs.Add("disable-gpu", "1");

Cef.Initialize(settings);

2.将屏幕的DPI置为96（缩放比例为100%）（后遗症，不可能每个电脑都去配置）

3.支持高DPI（后遗症，winform窗体会缩放）

Cef.EnableHighDPISupport();

4.（采用）让整个程序支持高DPI

（1）为项目添加应用程序清单文件（app.manifest）,并取消下面行的注释

<application xmlns="urn:schemas-microsoft-com:asm.v3">
<windowsSettings>
<dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
</windowsSettings>
</application>

（2）将Form和UserControl的AutoScaleMode设置为Dpi

如果你做了窗体自适应（根据控件的固定大小，按照拉伸比例来拉伸），还需要以下步骤：

（3）添加获取DPI和缩放比例的帮助类（因为网上出处太多了，这里就不写引用了）

 

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public class PrimaryScreenHelper     {         #region Win32 API          [DllImport("user32.dll")]         static extern IntPtr GetDC(IntPtr ptr);         [DllImport("gdi32.dll")]         static extern int GetDeviceCaps(         IntPtr hdc, // handle to DC          int nIndex // index of capability          );         [DllImport("user32.dll", EntryPoint = "ReleaseDC")]         static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);         #endregion         #region DeviceCaps常量          const int HORZRES = 8;         const int VERTRES = 10;         const int LOGPIXELSX = 88;         const int LOGPIXELSY = 90;         const int DESKTOPVERTRES = 117;         const int DESKTOPHORZRES = 118;         #endregion           #region 属性          /// <summary>          /// 获取屏幕分辨率当前物理大小          /// </summary>          public static Size WorkingArea         {             get             {                 IntPtr hdc = GetDC(IntPtr.Zero);                 Size size = new Size();                 size.Width = GetDeviceCaps(hdc, HORZRES);                 size.Height = GetDeviceCaps(hdc, VERTRES);                 ReleaseDC(IntPtr.Zero, hdc);                 return size;             }         }         /// <summary>          /// 当前系统DPI_X 大小 一般为96          /// </summary>          public static int DpiX         {             get             {                 IntPtr hdc = GetDC(IntPtr.Zero);                 int DpiX = GetDeviceCaps(hdc, LOGPIXELSX);                 ReleaseDC(IntPtr.Zero, hdc);                 return DpiX;             }         }         /// <summary>          /// 当前系统DPI_Y 大小 一般为96          /// </summary>          public static int DpiY         {             get             {                 IntPtr hdc = GetDC(IntPtr.Zero);                 int DpiX = GetDeviceCaps(hdc, LOGPIXELSY);                 ReleaseDC(IntPtr.Zero, hdc);                 return DpiX;             }         }         /// <summary>          /// 获取真实设置的桌面分辨率大小          /// </summary>          public static Size DESKTOP         {             get             {                 IntPtr hdc = GetDC(IntPtr.Zero);                 Size size = new Size();                 size.Width = GetDeviceCaps(hdc, DESKTOPHORZRES);                 size.Height = GetDeviceCaps(hdc, DESKTOPVERTRES);                 ReleaseDC(IntPtr.Zero, hdc);                 return size;             }         }           /// <summary>          /// 获取宽度缩放百分比          /// </summary>          public static float ScaleX         {             get             {                 IntPtr hdc = GetDC(IntPtr.Zero);                 int t = GetDeviceCaps(hdc, DESKTOPHORZRES);                 int d = GetDeviceCaps(hdc, HORZRES);                 float ScaleX = (float)GetDeviceCaps(hdc, DESKTOPHORZRES) / (float)GetDeviceCaps(hdc, HORZRES);                 ReleaseDC(IntPtr.Zero, hdc);                 return ScaleX;             }         }         /// <summary>          /// 获取高度缩放百分比          /// </summary>          public static float ScaleY         {             get             {                 IntPtr hdc = GetDC(IntPtr.Zero);                 float ScaleY = (float)(float)GetDeviceCaps(hdc, DESKTOPVERTRES) / (float)GetDeviceCaps(hdc, VERTRES);                 ReleaseDC(IntPtr.Zero, hdc);                 return ScaleY;             }         }           /// <summary>         /// 获取高DPI下屏幕的缩放比例         /// </summary>         public static float ScalePercent         {             get { return DpiX / 96.0F; }         }         #endregion     }

　　

 

（4）UserControl回复为缩放前的大小

 this.lblClassTime.Location = new System.Drawing.Point((int)(8 * PrimaryScreenHelper.ScalePercent), (int)(75 * PrimaryScreenHelper.ScalePercent));
            this.lblClassTime.Size = new System.Drawing.Size((int)(285 * PrimaryScreenHelper.ScalePercent), (int)(22 * PrimaryScreenHelper.ScalePercent));