C#窗体程序实现全屏及取消全屏步骤
由于项目需要，需要用vs窗体程序实现播放视频的窗口的全屏和取消全屏。
具体实现界面如图：
这是初始状态，视频框的右上角就是控制全屏的按钮
这是全屏后的状态，此时全屏按钮变成了取消全屏的样式
注：为了界面的美观我的全屏并没有把左边的那些控件也盖住，但是是可以设置的，下边代码部分我会进行讲解。
1、首先说明一下我所用的控件及我的项目中控件的名称，以便大家理解。
显示视频的黑框是一个picturebox即代码中的VideoPlayWnd，全屏/取消全屏是一个button即代码中的button4
2、具体代码如下：
全屏和取消全屏是一个按钮即button4
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");//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");//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");
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）
}
}
以上代码中的按钮是给它加了一个全屏样式的背景图片，并在点击时切换背景图片。
补充知识：C# 窗体视频控件进入全屏模式和退出全屏模式
窗体控件进入全屏模式和退出全屏模式，视频播放的时候用到此功能。
工具类代码
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;
};
}
}
调用方式
/// <summary>
/// 全屏事件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
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");
}
/// <summary>
/// 按键弹起事件
/// </summary>
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");
}
}
测试效果图
注意：在使用SDL的全屏操作过程中设置是无效的，播放视频过程中不能实现修改。代码如下：
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);
//}
}
工具代码功能改进
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
{
/// <summary>
/// 定义全屏抽象类
/// </summary>
public abstract class FullScreenObject
{
public abstract void FullScreen(bool flag);
}
/// <summary>
/// 桌面全屏
/// </summary>
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;
}
}
/// <summary>
/// 在容器内部全屏
/// </summary>
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;
}
}
/// <summary>
/// Windows系统API-SDK
/// </summary>
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);
}
/// <summary>
/// 图像区域对象
/// </summary>
public struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
}
/// <summary>
/// 图像点位位置
/// </summary>
public struct POINT
{
public int x;
public int y;
}
/// <summary>
/// 图像窗口对象
/// </summary>
public struct WINDOWPLACEMENT
{
public uint length;
public uint flags;
public uint showCmd;
public POINT ptMinPosition;
public POINT ptMaxPosition;
public RECT rcNormalPosition;
}
}
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