CefSharp 在Winform中有黑边的解决方法

标签：GetDeviceCaps IntPtr CefSharp 黑边 int Zero hdc static Winform

存在的问题如下：

 

 

 

解决方法1：将cefsharp的gpu设置为无效，在Program.cs中修改，或者在构造cefsharp之前做如下修改（后遗症，h5动画会出现卡顿现象，慎用）：

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

 

解决方法2：支持高DPI（后遗症，winform窗体会缩放）

Cef.EnableHighDPISupport();

 

解决方法3：让整个程序支持高DPI（最优解决方案）：

（1）为项目添加应用程序清单文件（app.manifest），创建app.manifest程序清单文件

（2）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>

（3）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：

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));

   添加获取DPI和缩放比例的帮助类

 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
     }

 

标签：GetDeviceCaps,IntPtr,CefSharp,黑边,int,Zero,hdc,static,Winform
From： https://www.cnblogs.com/19930521zhang/p/16807649.html