C# 调用摄像头 黑屏
我在网上下截了一个生成解析二维码的源码,在某些电脑上可以正常运行,但是在win8系统的平板电脑上就不能正常使用,在调用摄像头的时候,摄像头的指示灯都没亮。求大神帮忙解决…… 摄像头 平板电脑 win8 C# --------------------编程问答-------------------- 是不是少framework --------------------编程问答-------------------- 不同的系统,不同的电脑,驱动也不一样。 --------------------编程问答-------------------- 我使用的是 C#的 WinForm开发界面。只是调用API连接摄像头,不应该存在驱动不一样的问题,平板电脑本身是可以拍照的。而framework不是WinForm的吧,应该是xaml的。 --------------------编程问答-------------------- 贴码 --------------------编程问答-------------------- 你的api的问题吧,能够正常连接说明连接那块儿没有问题,就是图像获取的时候出错了--------------------编程问答--------------------
--------------------编程问答-------------------- 顶上来。求大神…… --------------------编程问答-------------------- 不想看源码了,楼主你确定没打错字,开场先说是“在网上下截了一个生成解析二维码的源码”,后面提问居然是调用摄像头。。。 --------------------编程问答-------------------- 可它里面有调用摄像头扫描二维码的功能啊,就是扫描二维码的picturebox的地方是黑屏的,所以才解决。
button开始调用摄像头
private void button2_Click(object sender, EventArgs e)
{
_doCount = 0;
_directory = Path.Combine(Application.StartupPath, "temp");
if (Directory.Exists(_directory))
{
var files = Directory.GetFiles(_directory);
for (int i = 0; i < files.Length; i++)
{
File.Delete(files[i]);
}
}
else
{
Directory.CreateDirectory(_directory);
}
//_camWorker = new CamWorker(panel1.Handle, 0, 0, panel1.Width, panel1.Height);
_camWorker = new CamWorker(panel1.Handle, 10,10, this.panel1.Width, this.panel1.Height);
_camWorker.Start();
_labelStatus.Text = "Cameram is working...";
if (_timer != null && _timer.Enabled)
{
_timer.Stop();
_timer.Dispose();
}
_timer = new System.Timers.Timer(1000);
_timer.Start();
_timer.Elapsed += new System.Timers.ElapsedEventHandler(_timer_Elapsed);
}
调用的类
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace GZBC
{
public class CamWorker
{
private const int WM_USER = 0x400;
private const int WS_CHILD = 0x40000000;
private const int WS_VISIBLE = 0x10000000;
private const int WM_CAP_START = WM_USER;
private const int WM_CAP_STOP = WM_CAP_START + 68;
private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
private const int WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63;
private const int WM_CAP_SET_OVERLAY = WM_CAP_START + 51;
private const int WM_CAP_SET_PREVIEW = WM_CAP_START + 50;
private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START + 6;
private const int WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2;
private const int WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START + 3;
private const int WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START + 5;
private const int WM_CAP_SET_SCALE = WM_CAP_START + 53;
private const int WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52;
private IntPtr hWndC;
private bool bWorkStart = false;
private IntPtr mControlPtr;
private int mWidth;
private int mHeight;
private int mLeft;
private int mTop;
/// <summary>
/// 初始化显示图像
/// </summary>
/// <param name= “handle “> 控件的句柄 </param>
/// <param name= “left “> 开始显示的左边距 </param>
/// <param name= “top “> 开始显示的上边距 </param>
/// <param name= “width “> 要显示的宽度 </param>
/// <param name= “height “> 要显示的长度 </param>
public CamWorker(IntPtr handle, int left, int top, int width, int height)
{
mControlPtr = handle;
mWidth = width;
mHeight = height;
mLeft = left;
mTop = top;
}
[DllImport("avicap32.dll ")]
private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
[DllImport("avicap32.dll ")]
private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize);
//
//这里特别注意,因为WinAPI中的long为32位,而C#中的long为64wei,所以需要将lParam该为int
//
[DllImport("User32.dll ")]
private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, int lParam);
/// <summary>
/// 开始显示图像
/// </summary>
public void Start()
{
if (bWorkStart)
return;
bWorkStart = true;
byte[] lpszName = new byte[100];
hWndC = capCreateCaptureWindowA(lpszName, WS_CHILD | WS_VISIBLE, mLeft, mTop, mWidth, mHeight, mControlPtr, 0);
if (hWndC.ToInt32() != 0)
{
SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
//Global.log.Write( “SendMessage “);
}
return;
}
/// <summary>
/// 停止显示
/// </summary>
public void Stop()
{
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
bWorkStart = false;
}
/// <summary>
/// 抓图
/// </summary>
/// <param name= “path “> 要保存bmp文件的路径 </param>
public void GrabImage(string path)
{
IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
SendMessage(hWndC, WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
}
}
}
运行在win8的系统上。
补充:.NET技术 , C#