在c#中集成

2026年 5月 20日下午3:55

## 简介
NodeMediaClient-Windows由c/c++开发，也可由c#调用。

## 集成步骤
下载并解压开发包，拷贝dll到编译目录下
### 1.注册dll
```
 public partial class Form1 : Form
    {
        private IntPtr _libNodeMediaClientDll;
        private IntPtr _npHandle;
        private bool _isStarting;

[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Ansi, BestFitMapping = false)]
        internal static extern IntPtr LoadLibrary(string dllToLoad);

[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Ansi, BestFitMapping = false)]
        internal static extern IntPtr GetProcAddress(IntPtr hModule, string procedureName);

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate IntPtr NodePlayer_new(byte[] domain, byte[] license);
        private NodePlayer_new _NodePlayer_new;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate void NodePlayer_free(IntPtr handle);
        private NodePlayer_free _NodePlayer_free;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_start(IntPtr handle, byte[] url);
        private NodePlayer_start _NodePlayer_start;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_stop(IntPtr handle);
        private NodePlayer_stop _NodePlayer_stop;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_onResize(IntPtr handle);
        private NodePlayer_onResize _NodePlayer_onResize;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_attachView(IntPtr handle, IntPtr hwnd);
        private NodePlayer_attachView _NodePlayer_attachView;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_detachView(IntPtr handle);
        private NodePlayer_detachView _NodePlayer_detachView;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_setBufferTime(IntPtr handle,int bufferTime);
        private NodePlayer_setBufferTime _NodePlayer_setBufferTime;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_setScaleMode(IntPtr handle, int scaleMode);
        private NodePlayer_setScaleMode _NodePlayer_setScaleMode;

[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_setVolume(IntPtr handle, float volume);
        private NodePlayer_setVolume _NodePlayer_setVolume;
		
		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
        private delegate int NodePlayer_setCryptoKey(IntPtr handle, byte[] cryptoKey);
        private NodePlayer_setCryptoKey _NodePlayer_setCryptoKey;
```
### 2.创建播放对象
```
        public Form1()
        {
            InitializeComponent();
            LoadDllDynamic();
            if(_libNodeMediaClientDll != IntPtr.Zero)
            {
                _npHandle = _NodePlayer_new(GetUtf8Bytes(""), GetUtf8Bytes(""));
            }
        }
		 private static byte[] GetUtf8Bytes(string s)
        {
            return Encoding.UTF8.GetBytes(s + "\0");
        }

private object GetDllType(Type type, string name)
        {
            IntPtr address = GetProcAddress(_libNodeMediaClientDll, name);
            if (address != IntPtr.Zero)
                return Marshal.GetDelegateForFunctionPointer(address, type);
            return null;
        }

private void LoadDllDynamic()
        {
            _libNodeMediaClientDll = LoadLibrary("libNodeMediaClient.dll");
            _NodePlayer_new = (NodePlayer_new)GetDllType(typeof(NodePlayer_new), "NodePlayer_new");
            _NodePlayer_free = (NodePlayer_free)GetDllType(typeof(NodePlayer_free), "NodePlayer_free");
            _NodePlayer_start = (NodePlayer_start)GetDllType(typeof(NodePlayer_start), "NodePlayer_start");
            _NodePlayer_stop = (NodePlayer_stop)GetDllType(typeof(NodePlayer_stop), "NodePlayer_stop");
            _NodePlayer_attachView = (NodePlayer_attachView)GetDllType(typeof(NodePlayer_attachView), "NodePlayer_attachView");
            _NodePlayer_detachView = (NodePlayer_detachView)GetDllType(typeof(NodePlayer_detachView), "NodePlayer_detachView");
            _NodePlayer_onResize = (NodePlayer_onResize)GetDllType(typeof(NodePlayer_onResize), "NodePlayer_onResize");
            _NodePlayer_setBufferTime = (NodePlayer_setBufferTime)GetDllType(typeof(NodePlayer_setBufferTime), "NodePlayer_setBufferTime");
            _NodePlayer_setScaleMode = (NodePlayer_setScaleMode)GetDllType(typeof(NodePlayer_setScaleMode), "NodePlayer_setScaleMode");
            _NodePlayer_setVolume = (NodePlayer_setVolume)GetDllType(typeof(NodePlayer_setVolume), "NodePlayer_setVolume");
            _NodePlayer_setCryptoKey = (NodePlayer_setCryptoKey)GetDllType(typeof(NodePlayer_setCryptoKey), "NodePlayer_setCryptoKey");
        }
```

### 3.设置视图
```
 var windowId = pictureBox1.Handle;
 _NodePlayer_attachView(_npHandle, windowId);
```
### 4.开始播放
```
        private void button1_Click(object sender, EventArgs e)
        {
            if(_isStarting)
            {
                _NodePlayer_stop(_npHandle);
                button1.Text = "Start";
            } else
            {
                var windowId = pictureBox1.Handle;
                _NodePlayer_attachView(_npHandle, windowId);
                _NodePlayer_setScaleMode(_npHandle,1);
                _NodePlayer_setBufferTime(_npHandle, 500);
                _NodePlayer_start(_npHandle, GetUtf8Bytes(textBox1.Text));
                button1.Text = "Stop";
            }
            _isStarting = !_isStarting;
        }

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (_npHandle != IntPtr.Zero)
            {
                _NodePlayer_free(_npHandle);
            }
        }
		
```

## 运行效果
![](https://www.nodemedia.cn/doc/server/../Public/Uploads/2022-01-19/61e7b1f4ba5fc.jpg)

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在c#中集成