Hay我是新媒体和C＃的新手我正在尝试视频会议应用程序，我差不多完成它但我的问题是一个dll的窗口实际上我使用的是窗口8.1而我正在尝试使用avicap32。 DLL打开和关闭我的网络摄像头，但它不能很好地启动网络摄像头只有一次启动后，直到我不重新启动计算机它总是显示黑屏我附加我的代码也供参考。提前致谢。
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;
using System.Drawing.Imaging;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.IO;
using DirectX.Capture;
using DShowNET;
namespace Video_Conference
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.SaveFileDialog saveFileDialog1;
internal PictureBox picture_comming;
private TextBox IP_textBox;
private Label label1;
private TextBox device_number_textBox;
private Label label2;
private Button button1;
private Button button2;
private System.Windows.Forms.Timer timer1;
#region WebCam API
const short WM_CAP = 1024;
const int WM_CAP_DRIVER_CONNECT = WM_CAP + 10;
const int WM_CAP_DRIVER_DISCONNECT = WM_CAP + 11;
const int WM_CAP_EDIT_COPY = WM_CAP + 30;
const int WM_CAP_SET_PREVIEW = WM_CAP + 50;
const int WM_CAP_SET_PREVIEWRATE = WM_CAP + 52;
const int WM_CAP_SET_SCALE = WM_CAP + 53;
const int WS_CHILD = 1073741824;
const int WS_VISIBLE = 268435456;
const short SWP_NOMOVE = 2;
const short SWP_NOSIZE = 1;
const short SWP_NOZORDER = 4;
const short HWND_BOTTOM = 1;
int iDevice = 0;
Capture capture = null;
Filters filters = null;
int counter = 1;
int hHwnd;
[System.Runtime.InteropServices.DllImport("user32", EntryPoint="SendMessageA")]
static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)] object lParam);
[System.Runtime.InteropServices.DllImport("user32", EntryPoint="SetWindowPos")]
static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
[System.Runtime.InteropServices.DllImport("user32")]
static extern bool DestroyWindow(int hndw);
[System.Runtime.InteropServices.DllImport("avicap32.dll")]
static extern int capCreateCaptureWindowA(string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);
[System.Runtime.InteropServices.DllImport("avicap32.dll")]
static extern bool capGetDriverDescriptionA(short wDriver, string lpszName, int cbName, string lpszVer, int cbVer);
private void OpenPreviewWindow()
{
int iHeight = 320;
int iWidth = 200;
//
// Open Preview window in picturebox
////
hHwnd = capCreateCaptureWindowA(iDevice.ToString(), (WS_VISIBLE | WS_CHILD), 0, 0, 640, 480, picCapture.Handle.ToInt32(), 0);
////hHwnd = 132190;
////
//// Connect to device
////
if (SendMessage(hHwnd, WM_CAP_DRIVER_CONNECT, iDevice, 0) == 1)
{
// //
// // Set the preview scale
// //
SendMessage(hHwnd, WM_CAP_SET_SCALE, 1, 0);
// //
// // Set the preview rate in milliseconds
// //
/ SendMessage(hHwnd, WM_CAP_SET_PREVIEWRATE, 66, 0);
// //
// Start previewing the image from the camera
// //
SendMessage(hHwnd, WM_CAP_SET_PREVIEW, 1, 0);
// //
// // Resize window to fit in picturebox
// //
SetWindowPos(hHwnd, HWND_BOTTOM, 0, 0, iWidth,iHeight, (SWP_NOMOVE | SWP_NOZORDER));
}
else
{
// //
// // Error connecting to device close window
// //
DestroyWindow(hHwnd);
}
}
void startOrStopCapturing(Capture capture)
{
btnStart.Visible = false;
if (capture != null) capture.Stop();
if (timer1.Enabled) timer1.Stop();
if (btnStart.Text == "START")
{
btnStart.Text = "STOP";
btnStart.BackColor = Color.Maroon;
try
{
if (!capture.Cued) capture.Filename = counter + ".wmv";
capture.Cue();
capture.Start();
timer1.Start();
}
catch (Exception ex)
{
MessageBox.Show("Error Message: \n\n" + ex.Message);
}
}
else
{
btnStart.Text = "START";
btnStart.BackColor = Color.DarkSlateBlue;
}
btnStart.Visible = true;
}
void preview(int deviceNo)
{
try
{
capture = new Capture(filters.VideoInputDevices[deviceNo], filters.AudioInputDevices[0]);
capture.PreviewWindow = picCapture;
if (btnStart.Text == "STOP")
{
counter++;
if (!capture.Cued) capture.Filename = counter + ".wmv";
capture.Cue();
}
capture.Start();
}
catch { }
}
private void ClosePreviewWindow()
{
//
// Disconnect from device
//
SendMessage(hHwnd, WM_CAP_DRIVER_DISCONNECT, iDevice, 0);
//
// close window
//
DestroyWindow(hHwnd);
}
#endregion
internal System.Windows.Forms.Button btnStop;
internal System.Windows.Forms.Button btnStart;
internal System.Windows.Forms.PictureBox picCapture;
private IContainer components;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.btnStop = new System.Windows.Forms.Button();
this.btnStart = new System.Windows.Forms.Button();
this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
this.IP_textBox = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.device_number_textBox = new System.Windows.Forms.TextBox();
this.label2 = new System.Windows.Forms.Label();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.timer1 = new System.Windows.Forms.Timer(this.components);
this.picture_comming = new System.Windows.Forms.PictureBox();
this.picCapture = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.picture_comming)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.picCapture)).BeginInit();
this.SuspendLayout();
//
// btnStop
//
this.btnStop.Anchor = System.Windows.Forms.AnchorStyles.None;
this.btnStop.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnStop.Location = new System.Drawing.Point(123, 56);
this.btnStop.Name = "btnStop";
this.btnStop.Size = new System.Drawing.Size(112, 32);
this.btnStop.TabIndex = 11;
this.btnStop.Text = "Stop Capturing";
this.btnStop.Click += new System.EventHandler(this.btnStop_Click);
//
// btnStart
//
this.btnStart.Anchor = System.Windows.Forms.AnchorStyles.None;
this.btnStart.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.btnStart.Location = new System.Drawing.Point(123, 18);
this.btnStart.Name = "btnStart";
this.btnStart.Size = new System.Drawing.Size(112, 32);
this.btnStart.TabIndex = 9;
this.btnStart.Text = "Start Capturing";
this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
//
// IP_textBox
//
this.IP_textBox.Location = new System.Drawing.Point(69, 303);
this.IP_textBox.Name = "IP_textBox";
this.IP_textBox.Size = new System.Drawing.Size(161, 20);
this.IP_textBox.TabIndex = 13;
this.IP_textBox.Text = "127.0.0.1";
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(12, 306);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(51, 13);
this.label1.TabIndex = 14;
this.label1.Text = "Remot IP";
//
// device_number_textBox
//
this.device_number_textBox.Location = new System.Drawing.Point(336, 25);
this.device_number_textBox.Name = "device_number_textBox";
this.device_number_textBox.Size = new System.Drawing.Size(48, 20);
this.device_number_textBox.TabIndex = 15;
this.device_number_textBox.Text = "0";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(238, 28);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(91, 13);
this.label2.TabIndex = 16;
this.label2.Text = "Capture Device #";
//
// button1
//
this.button1.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.button1.Location = new System.Drawing.Point(336, 300);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 17;
this.button1.Text = "Listener";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.FlatStyle = System.Windows.Forms.FlatStyle.System;
this.button2.Location = new System.Drawing.Point(239, 301);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(91, 23);
this.button2.TabIndex = 18;
this.button2.Text = "Start Sending";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// timer1
//
this.timer1.Interval = 1000;
this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
//
// picture_comming
//
this.picture_comming.Anchor = System.Windows.Forms.AnchorStyles.None;
this.picture_comming.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.picture_comming.Image = global::Video_Conference.Properties.Resources.ip;
this.picture_comming.Location = new System.Drawing.Point(15, 104);
this.picture_comming.Name = "picture_comming";
this.picture_comming.Size = new System.Drawing.Size(246, 189);
this.picture_comming.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.picture_comming.TabIndex = 12;
this.picture_comming.TabStop = false;
//
// picCapture
//
this.picCapture.Anchor = System.Windows.Forms.AnchorStyles.None;
this.picCapture.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.picCapture.Image = global::Video_Conference.Properties.Resources.icony;
this.picCapture.Location = new System.Drawing.Point(15, 18);
this.picCapture.Name = "picCapture";
this.picCapture.Size = new System.Drawing.Size(102, 80);
this.picCapture.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
this.picCapture.TabIndex = 6;
this.picCapture.TabStop = false;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(414, 338);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.label2);
this.Controls.Add(this.device_number_textBox);
this.Controls.Add(this.label1);
this.Controls.Add(this.IP_textBox);
this.Controls.Add(this.picture_comming);
this.Controls.Add(this.btnStop);
this.Controls.Add(this.btnStart);
this.Controls.Add(this.picCapture);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
this.MaximizeBox = false;
this.Name = "Form1";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Video Conference - Peer 1 - www.fadidotnet.org";
this.Closing += new System.ComponentModel.CancelEventHandler(this.Form1_Closing);
this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.picture_comming)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.picCapture)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
TcpClient myclient;
MemoryStream ms;
NetworkStream myns;
BinaryWriter mysw;
Thread myth;
TcpListener mytcpl;
Socket mysocket;
NetworkStream ns;
private void Start_Receiving_Video_Conference()
{
try
{
// Open The Port
string i = "2.1.168.192";
long z = (long)(uint)IPAddress.NetworkToHostOrder((int)IPAddress.Parse(i).Address);
IPAddress ip = new IPAddress(z);
mytcpl = new TcpListener(ip, 6000);
mytcpl.Start(); // Start Listening on That Port
mysocket = mytcpl.AcceptSocket(); // Accept Any Request From Client and Start a Session
ns = new NetworkStream(mysocket); // Receives The Binary Data From Port
picture_comming.Image = Image.FromStream(ns);
mytcpl.Stop(); // Close TCP Session
if (mysocket.Connected == true) // Looping While Connected to Receive Another Message
{
while (true)
{
Start_Receiving_Video_Conference(); // Back to First Method
}
}
myns.Flush();
}
catch (Exception) { button1.Enabled = true; myth.Abort(); }
}
private void Start_Sending_Video_Conference(string remote_IP, int port_number)
{
try
{
ms = new MemoryStream();// Store it in Binary Array as Stream
IDataObject data;
Image bmap;
// Copy image to clipboard
SendMessage(hHwnd, WM_CAP_EDIT_COPY, 0, 0);
// Get image from clipboard and convert it to a bitmap
data = Clipboard.GetDataObject();
if (data.GetDataPresent(typeof(System.Drawing.Bitmap)))
{
bmap = ((Image)(data.GetData(typeof(System.Drawing.Bitmap))));
bmap.Save(ms, ImageFormat.Bmp);
}
picCapture.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
byte[] arrImage = ms.GetBuffer();
myclient = new TcpClient(remote_IP, port_number);//Connecting with server
myns = myclient.GetStream();
mysw = new BinaryWriter(myns);
mysw.Write(arrImage);//send the stream to above address
ms.Flush();
mysw.Flush();
myns.Flush();
ms.Close();
mysw.Close();
myns.Close();
myclient.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Video Conference Error Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void btnStart_Click(object sender, System.EventArgs e)
{
iDevice = int.Parse (device_number_textBox.Text);
OpenPreviewWindow();
}
private void btnStop_Click(object sender, System.EventArgs e)
{
ClosePreviewWindow();
}
private void Form1_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
if (btnStop.Enabled)
{
ClosePreviewWindow();
}
}
private void button1_Click(object sender, EventArgs e)
{
button1.Enabled = false;
myth = new Thread(new System.Threading.ThreadStart(Start_Receiving_Video_Conference)); // Start Thread Session
myth.Start(); // Start Receiveing Camera
}
private void timer1_Tick(object sender, EventArgs e)
{
Start_Sending_Video_Conference(IP_textBox.Text, 6000);
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
try
{
mytcpl.Stop();
myth.Abort();
}
catch (Exception){}
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
}
}
}