C#窗体程序实现全屏及取消全屏步骤

 private Int16 zoom = -1;//用来控制点击此button4的时候，是需要全屏还是取消全屏 //视频窗口的缩放代码 private void button4_Click(object sender, EventArgs e) { if(zoom<0) { float w = this.Width - 210; //为了保证左边的控件不被挡上减了一个210 float h = this.Height - 50;//为了底下的按钮不被挡上，因为还要用到，因此减了50 this.VideoPlayWnd.Size = Size.Ceiling(new SizeF(w, h));//重新部署视频框即这个picturebox空间的长宽 VideoPlayWnd.Location = new System.Drawing.Point(210, 0);//视频框的左上角坐标，会发现与我上边减去的210一致（大家肯定都理解为什么我就不说了） button4.Location = new System.Drawing.Point(795, 0);//不能只有picturebox变了，这个button的位置也要保证和视频框同步，所以需要重设坐标 // button4.BackgroundImage = Image.FromFile(@"E:\lwj\addpersoninfo\addpersoninfo\Resources\退出全屏.png-600");//绝对路径（这是我测试的时候用的） button4.BackgroundImage = Image.FromFile(AppDomain.CurrentDomain.BaseDirectory + @"退出全屏.png-600");//AppDomain.CurrentDomain.BaseDirectory语句可以获取到你当前项目的bin目录，所以需要把图片放到对应目录下 zoom = 1;//全屏之后，再点击需要取消全屏，因此要改变zoom的值 } else { //以下为取消全屏，即还原自己的视频框和按钮，具体操作类似全屏，就不细致注释了 VideoPlayWnd.Location = new System.Drawing.Point(495, 360); this.VideoPlayWnd.Size = Size.Ceiling(new SizeF(323, 271)); button4.Location = new System.Drawing.Point(795, 360); button4.BackgroundImage = Image.FromFile(AppDomain.CurrentDomain.BaseDirectory + @"全屏.png-600"); zoom = -1;//取消全屏后再点击就要进行全屏，因此继续设为-1（保证小于0，以满足全屏操作的if条件） } } 

 using System; using System.Collections.Generic; using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace CvNetVideo.Play { class FullScreenHelper { bool m_bFullScreen = false; IntPtr m_OldWndParent = IntPtr.Zero; WINDOWPLACEMENT m_OldWndPlacement = new WINDOWPLACEMENT(); Control m_control = null; public FullScreenHelper(Control c) { m_control = c; } struct POINT { int x; int y; }; struct RECT { public int left; public int top; public int right; public int bottom; }; //锁定指定窗口，禁止它更新。同时只能有一个窗口处于锁定状态。锁定指定窗口，禁止它更新。同时只能有一个窗口处于锁定状态 [DllImport("User32.dll")] public static extern bool LockWindowUpdate(IntPtr hWndLock); //函数来设置弹出式窗口，层叠窗口或子窗口的父窗口。新的窗口与窗口必须属于同一应用程序 [DllImport("User32.dll")] public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent); //函数设置指定窗口的显示状态和恢复，最大化，最小化位置。函数功能： 函及原型 [DllImport("User32.dll")] public static extern bool SetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl); //函数将创建指定窗口的线程设置到前台，并且激活该窗口。键盘输入转向该窗口，并为用户改各种可视的记号 [DllImport("User32.dll")] public static extern bool SetForegroundWindow(IntPtr hWnd); //该函数返回桌面窗口的句柄。桌面窗口覆盖整个屏幕。桌面窗口是一个要在其上绘制所有的图标和其他窗口的区域 [DllImport("User32.dll")] public static extern IntPtr GetDesktopWindow(); //函数名。该函数返回指定窗口的显示状态以及被恢复的、最大化的和最小化的窗口位置 [DllImport("User32.dll")] public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl); //是用于得到被定义的系统数据或者系统配置信息的一个专有名词 [DllImport("User32.dll")] public static extern int GetSystemMetrics(int nIndex); [DllImport("user32.dll", EntryPoint = "GetParent", SetLastError = true)] public static extern IntPtr GetParent(IntPtr hWnd); [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags); [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern System.IntPtr GetForegroundWindow(); [DllImport("user32")] public static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect); [DllImport("user32.dll")] public static extern uint ScreenToClient(IntPtr hwnd, ref POINT p); public void FullScreen(bool flag) { m_bFullScreen = flag; if (!m_bFullScreen) { LockWindowUpdate(m_control.Handle); SetParent(m_control.Handle, m_OldWndParent); SetWindowPlacement(m_control.Handle, ref m_OldWndPlacement); SetForegroundWindow(m_OldWndParent); LockWindowUpdate(IntPtr.Zero); } else { GetWindowPlacement(m_control.Handle, ref m_OldWndPlacement); int nScreenWidth = GetSystemMetrics(0); int nScreenHeight = GetSystemMetrics(1); m_OldWndParent = GetParent(m_control.Parent.Handle); SetParent(m_control.Handle, GetDesktopWindow()); WINDOWPLACEMENT wp1 = new WINDOWPLACEMENT(); wp1.length = (uint)Marshal.SizeOf(wp1); wp1.showCmd = 1; wp1.rcNormalPosition.left = 0; wp1.rcNormalPosition.top = 0; wp1.rcNormalPosition.right = nScreenWidth; wp1.rcNormalPosition.bottom = nScreenHeight; SetWindowPlacement(m_control.Handle, ref wp1); SetForegroundWindow(GetDesktopWindow()); SetForegroundWindow(m_control.Handle); } m_bFullScreen = !m_bFullScreen; } struct WINDOWPLACEMENT { public uint length; public uint flags; public uint showCmd; public POINT ptMinPosition; public POINT ptMaxPosition; public RECT rcNormalPosition; }; } }

 /// 
 /// 全屏事件 /// 
 ///  ///  private void UCVideo_DoubleClick(object sender, EventArgs e) { //全屏设置 //sdlVideo.SDL_MaximizeWindow(); fullScreenHelper = new CvNetVideo.Play.FullScreenHelper(this); fullScreenHelper.FullScreen(true); Console.WriteLine("Entrance FullScreen Mode"); } /// 
 /// 按键弹起事件 /// 
 private void UCVideo_KeyUp(object sender, KeyEventArgs e) { // ESC 退出全屏 if (e.KeyCode == Keys.Escape&& fullScreenHelper!=null) { fullScreenHelper.FullScreen(false); fullScreenHelper = null; Console.WriteLine("Exit FullScreen Mode"); } }

 public void SDL_MaximizeWindow() { Console.WriteLine("设置全屏"); SDL.SDL_MaximizeWindow(screen); SDL.SDL_SetWindowFullscreen(screen, SDL.SDL_GetWindowFlags(screen)); SDL.SDL_ShowWindow(screen); //int width, height; 获取最大窗口值 //SDL2.SDL.SDL_GetWindowMaximumSize(screen, out width, out height); 设置最大窗口值 //if (width>0&&height>0) //{ // SDL2.SDL.SDL_SetWindowMaximumSize(screen, width, height); // Console.WriteLine("设置全屏......成功!width=" + width + ",height=" + height); //} //else //{ // Console.WriteLine("设置全屏......失败!width=" + width + ",height=" + height); // SDL2.SDL.SDL_SetWindowMaximumSize(screen, w, h); //} }

 using System; using System.Collections.Generic; using System.Linq; using System.Runtime.InteropServices; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace CvNetVideo.Play { /// 
 /// 定义全屏抽象类 /// 
 public abstract class FullScreenObject { public abstract void FullScreen(bool flag); } /// 
 /// 桌面全屏 /// 
 public unsafe class FullScreenHelper: FullScreenObject { bool m_bFullScreen = false; WINDOWPLACEMENT m_OldWndPlacement = new WINDOWPLACEMENT(); UCVideo m_control = null; public FullScreenHelper(UCVideo control) { m_control = control; } private IntPtr m_OldWndParent = IntPtr.Zero; DockStyle old_docker_style; int old_left; int old_width; int old_height; int old_top; public override void FullScreen(bool flag) { m_bFullScreen = flag; if (!m_bFullScreen) { #region 方式一：窗体容积改变时不能全屏，未能解决IE全屏显示不全问题 //ShellSDK.LockWindowUpdate(m_control.Handle); //ShellSDK.SetParent(m_control.Handle, m_OldWndParent); //ShellSDK.SetWindowPlacement(m_control.Handle, ref m_OldWndPlacement); //ShellSDK.SetForegroundWindow(m_OldWndParent); //ShellSDK.LockWindowUpdate(IntPtr.Zero); #endregion #region 方式二：在容器改变时可以实现全屏，未能解决IE全屏显示不全问题 // 取消全屏设置 m_control.Dock = old_docker_style; m_control.Left = old_left; m_control.Top = old_top; m_control.Width = old_width; m_control.Height = old_height; ShellSDK.SetParent(m_control.Handle, m_OldWndParent); #endregion } else { #region 方式一：窗体容积改变时不能全屏，未能解决IE全屏显示不全问题 //ShellSDK.GetWindowPlacement(m_control.Handle, ref m_OldWndPlacement); //int nScreenWidth = ShellSDK.GetSystemMetrics(0); //int nScreenHeight = ShellSDK.GetSystemMetrics(1); //m_OldWndParent = ShellSDK.GetParent(m_control.Handle); //ShellSDK.SetParent(m_control.Handle, ShellSDK.GetDesktopWindow()); //WINDOWPLACEMENT wp1 = new WINDOWPLACEMENT(); //wp1.length = (uint)Marshal.SizeOf(wp1); //wp1.showCmd = 1; //wp1.rcNormalPosition.left = 0; //wp1.rcNormalPosition.top = 0; //wp1.rcNormalPosition.right = Screen.PrimaryScreen.Bounds.Width/*nScreenWidth*/; //wp1.rcNormalPosition.bottom = Screen.PrimaryScreen.WorkingArea.Height/* nScreenHeight*/; //ShellSDK.SetWindowPlacement(m_control.Handle, ref wp1); //ShellSDK.SetForegroundWindow(ShellSDK.GetDesktopWindow()); //ShellSDK.SetForegroundWindow(m_control.Handle); #endregion #region 方式二：在容器改变时可以实现全屏，未能解决IE全屏显示不全问题 // 记录原来的数据 old_docker_style = m_control.Dock; old_left = m_control.Left; old_width = m_control.Width; old_height = m_control.Height; old_top = m_control.Top; m_OldWndParent = ShellSDK.GetParent(m_control.Handle); // 设置全屏数据 int nScreenWidth = ShellSDK.GetSystemMetrics(0); int nScreenHeight = ShellSDK.GetSystemMetrics(1); m_control.Dock = DockStyle.None; m_control.Left = 0; m_control.Top = 0; m_control.Width = nScreenWidth; m_control.Height = nScreenHeight; ShellSDK.SetParent(m_control.Handle, ShellSDK.GetDesktopWindow()); ShellSDK.SetWindowPos(m_control.Handle, -1, 0, 0, m_control.Right - m_control.Left, m_control.Bottom - m_control.Top, 0); #endregion } m_bFullScreen = !m_bFullScreen; } } /// 
 /// 在容器内部全屏 /// 
 public class FullScreenInContainerHelper : FullScreenObject { bool m_bFullScreen = false; Control m_control = null; public FullScreenInContainerHelper(Control control) { m_control = control; } private IntPtr m_OldWndParent = IntPtr.Zero; private IntPtr m_father_hwnd; private RECT m_rect = new RECT(); public override void FullScreen(bool flag) { m_bFullScreen = flag; if (!m_bFullScreen) { ShellSDK.SetParent(m_control.Handle, m_father_hwnd); ShellSDK.SetWindowPos(m_control.Handle, 0, m_rect.left, m_rect.top, m_rect.right - m_rect.left, m_rect.bottom - m_rect.top, 0); ShellSDK.SetForegroundWindow(m_father_hwnd); } else { m_father_hwnd = ShellSDK.GetParent(m_control.Handle); ShellSDK.GetWindowRect(m_control.Handle, out RECT rect); POINT pt = new POINT(); pt.x = rect.left; pt.y = rect.top; ShellSDK.ScreenToClient(m_father_hwnd, ref pt); rect.right = rect.right - rect.left + pt.x; rect.bottom = rect.bottom - rect.top + pt.y; rect.left = pt.x; rect.top = pt.y; m_rect = rect; ShellSDK.GetWindowRect(m_father_hwnd, out RECT rect_fature); ShellSDK.SetWindowPos(m_control.Handle, 0, 0, 0, rect_fature.right - rect_fature.left, rect_fature.bottom - rect_fature.top, 0); } m_bFullScreen = !m_bFullScreen; } } /// 
 /// Windows系统API-SDK /// 
 public class ShellSDK { //锁定指定窗口，禁止它更新。同时只能有一个窗口处于锁定状态。锁定指定窗口，禁止它更新。同时只能有一个窗口处于锁定状态 [DllImport("User32.dll")] public static extern bool LockWindowUpdate(IntPtr hWndLock); //函数来设置弹出式窗口，层叠窗口或子窗口的父窗口。新的窗口与窗口必须属于同一应用程序 [DllImport("User32.dll")] public static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent); //函数设置指定窗口的显示状态和恢复，最大化，最小化位置。函数功能： 函及原型 [DllImport("User32.dll")] public static extern bool SetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl); //函数将创建指定窗口的线程设置到前台，并且激活该窗口。键盘输入转向该窗口，并为用户改各种可视的记号 [DllImport("User32.dll")] public static extern bool SetForegroundWindow(IntPtr hWnd); //该函数返回桌面窗口的句柄。桌面窗口覆盖整个屏幕。桌面窗口是一个要在其上绘制所有的图标和其他窗口的区域 [DllImport("User32.dll")] public static extern IntPtr GetDesktopWindow(); //函数名。该函数返回指定窗口的显示状态以及被恢复的、最大化的和最小化的窗口位置 [DllImport("User32.dll")] public static extern bool GetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl); //是用于得到被定义的系统数据或者系统配置信息的一个专有名词 [DllImport("User32.dll")] public static extern int GetSystemMetrics(int nIndex); [DllImport("user32.dll", EntryPoint = "GetParent", SetLastError = true)] public static extern IntPtr GetParent(IntPtr hWnd); [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern int SetWindowPos(IntPtr hWnd, int hWndInsertAfter, int x, int y, int Width, int Height, int flags); [DllImport("user32.dll", CharSet = CharSet.Auto)] public static extern System.IntPtr GetForegroundWindow(); [DllImport("user32")] public static extern bool GetWindowRect(IntPtr hwnd, out RECT lpRect); [DllImport("user32.dll")] public static extern uint ScreenToClient(IntPtr hwnd, ref POINT p); } /// 
 /// 图像区域对象 /// 
 public struct RECT { public int left; public int top; public int right; public int bottom; } /// 
 /// 图像点位位置 /// 
 public struct POINT { public int x; public int y; } /// 
 /// 图像窗口对象 /// 
 public struct WINDOWPLACEMENT { public uint length; public uint flags; public uint showCmd; public POINT ptMinPosition; public POINT ptMaxPosition; public RECT rcNormalPosition; } }