IBM Rational 系统开发最佳实践工具包	WebSphere MQ 最佳实践 TOP 15

有人作过摄像头的程序没有，在预览的同时录像为什么界面象死机？

楼主cq_lqj（程序员秘书）2006-03-13 10:20:54 在 .NET技术 / C# 提问

开始运行程序时设置好预览，这时我开始录像，鼠标就变成“酒杯状”，但预览在正常进行，录像也正常进行，停止通过按ESC键，该程序失去焦点后也停止。我本想作过停止按钮都不好作了。

有哪位知道或遇到过同样的问题，请指点指点，谢谢了！问题点数：50、回复次数：9Top

1 楼luqinjian（大海）回复于 2006-03-13 11:42:55 得分 10

关注Top

2 楼zlz_212（ShREk）回复于 2006-03-13 11:55:58 得分 10

关注Top

3 楼wxdl1981（沉默之狼）回复于 2006-03-13 12:10:15 得分 10

是不是因为录象时占用ＣＰＵ资源太多引起的．
你用多线程试试Top

4 楼cq_lqj（程序员秘书）回复于 2006-03-13 12:21:25 得分 0

单独录像开一个线程，是可以的
预览同时录像，开多线程也是一样的现象Top

5 楼blackhero（黑侠客）回复于 2006-03-13 15:26:08 得分 10

你做的是cs or bs的呀Top

6 楼luckin（aliang）回复于 2006-04-27 16:35:34 得分 10

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;

namespace CapTureMovie
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button BtnCapTure;
private System.Windows.Forms.Panel panel_Vedio;
private int hHwnd;
private System.Windows.Forms.Button BtnStop;
private System.Windows.Forms.Label LbSysMsg;
private System.Windows.Forms.Button button1;

public struct videohdr_tag
{
public byte[] lpData;
public int dwBufferLength;
public int dwBytesUsed;
public int dwTimeCaptured;
public int dwUser;
public int dwFlags;
public int[] dwReserved;

}
public delegate bool CallBack(int hwnd, int lParam);
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
[DllImport("avicap32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)]
public static extern int capCreateCaptureWindowA([MarshalAs(UnmanagedType.VBByRefStr)] ref string lpszWindowName, int dwStyle, int x, int y, int nWidth, short nHeight, int hWndParent, int nID);
[DllImport("avicap32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)]
public static extern bool capGetDriverDescriptionA(short wDriver, [MarshalAs(UnmanagedType.VBByRefStr)] ref string lpszName, int cbName, [MarshalAs(UnmanagedType.VBByRefStr)] ref string lpszVer, int cbVer);
[DllImport("user32", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)]
public static extern bool DestroyWindow(int hndw);
[DllImport("user32", EntryPoint="SendMessageA", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)]
public static extern int SendMessage(int hwnd, int wMsg, int wParam, [MarshalAs(UnmanagedType.AsAny)] object lParam);
[DllImport("user32", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)]
public static extern int SetWindowPos(int hwnd, int hWndInsertAfter, int x, int y, int cx, int cy, int wFlags);
[DllImport("vfw32.dll")]
public static extern string capVideoStreamCallback(int hwnd,videohdr_tag videohdr_tag);
[DllImport("vicap32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)]
public static extern bool capSetCallbackOnFrame(int hwnd,string s);

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
this.panel_Vedio = new System.Windows.Forms.Panel();
this.BtnCapTure = new System.Windows.Forms.Button();
this.BtnStop = new System.Windows.Forms.Button();
this.LbSysMsg = new System.Windows.Forms.Label();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// panel_Vedio
//
this.panel_Vedio.BackgroundImage = ((System.Drawing.Image)(resources.GetObject("panel_Vedio.BackgroundImage")));
this.panel_Vedio.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
this.panel_Vedio.Location = new System.Drawing.Point(8, 16);
this.panel_Vedio.Name = "panel_Vedio";
this.panel_Vedio.Size = new System.Drawing.Size(288, 224);
this.panel_Vedio.TabIndex = 0;
//
// BtnCapTure
//
this.BtnCapTure.Location = new System.Drawing.Point(24, 256);
this.BtnCapTure.Name = "BtnCapTure";
this.BtnCapTure.TabIndex = 1;
this.BtnCapTure.Text = "图象采集";
this.BtnCapTure.Click += new System.EventHandler(this.BtnCapTure_Click);
//
// BtnStop
//
this.BtnStop.Enabled = false;
this.BtnStop.Location = new System.Drawing.Point(136, 256);
this.BtnStop.Name = "BtnStop";
this.BtnStop.TabIndex = 1;
this.BtnStop.Text = "停止采集";
this.BtnStop.Click += new System.EventHandler(this.BtnStop_Click);
//
// LbSysMsg
//
this.LbSysMsg.Location = new System.Drawing.Point(16, 296);
this.LbSysMsg.Name = "LbSysMsg";
this.LbSysMsg.Size = new System.Drawing.Size(240, 23);
this.LbSysMsg.TabIndex = 2;
//
// button1
//
this.button1.Location = new System.Drawing.Point(304, 48);
this.button1.Name = "button1";
this.button1.TabIndex = 3;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(400, 357);
this.Controls.Add(this.button1);
this.Controls.Add(this.LbSysMsg);
this.Controls.Add(this.BtnCapTure);
this.Controls.Add(this.panel_Vedio);
this.Controls.Add(this.BtnStop);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void BtnCapTure_Click(object sender, System.EventArgs e)
{
this.OpenCapture();

}
private void OpenCapture()
{

int intWidth=this.panel_Vedio.Width;
int intHeight=this.panel_Vedio.Height;
int intDevice=0;
string refDevice=intDevice.ToString();
hHwnd=Form1.capCreateCaptureWindowA(ref refDevice,1342177280,0,0,640,480,this.panel_Vedio.Handle.ToInt32(),0);
this.LbSysMsg.Text="";
this.LbSysMsg.Text+="驱动:"+refDevice;
if(Form1.SendMessage(hHwnd,0x40a,intDevice,0)>0)
{
Form1.SendMessage(this.hHwnd,0x435,-1, 0);
Form1.SendMessage(this.hHwnd,0x434,0x42, 0);
Form1.SendMessage(this.hHwnd,0x432,-1, 0);
Form1.SetWindowPos(this.hHwnd,1,0,0,intWidth,intHeight,6);
this.BtnCapTure.Enabled=false;
this.BtnStop.Enabled=true;
}
else
{
Form1.DestroyWindow(this.hHwnd);
this.BtnCapTure.Enabled=false;
this.BtnStop.Enabled=true;
}
}

private void BtnStop_Click(object sender, System.EventArgs e)
{
Form1.SendMessage(this.hHwnd, 0x40b, 0, 0);
Form1.DestroyWindow(this.hHwnd);
this.BtnCapTure.Enabled=true;
this.BtnStop.Enabled=false;
}

private void button1_Click(object sender, System.EventArgs e)
{
try
{
Form1.SendMessage(this.hHwnd,0x41e,0,0);
IDataObject obj1 = Clipboard.GetDataObject();
if (obj1.GetDataPresent(typeof(Bitmap)))
{
Image image1 = (Image) obj1.GetData(typeof(Bitmap));
// this.panel_Vedio.Image = image1;
// this.ClosePreviewWindow();

SaveFileDialog SaveFileDialog1=new SaveFileDialog();
if (SaveFileDialog1.ShowDialog() == DialogResult.OK)
{
image1.Save(SaveFileDialog1.FileName, ImageFormat.Bmp);
}
}
}
catch
{
}
}
}
}Top

7 楼luckin（aliang）回复于 2006-04-27 16:36:09 得分 0

8 楼LCW010（编程无涯）回复于 2006-04-27 17:32:54 得分 0

studyTop

9 楼Climb_Tree（climbTree@msn.com）回复于 2006-04-27 17:59:08 得分 0