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提供window平台下基于Net技术和Qt技术的多点触摸设备应用开发，画板开发，摄像头/展台设备应用开发
本质还是对DX接口的运用，直接代码好理解
1. 定义设备接口
public interface IDevice{
string DeviceName{get;set;} //设备名称
string DevicePath{get;set;} //设备路径
System.Runtime.InteropServices.ComTypes.IMoniker Moniker{get;set;}
}
2.展台设备接口
public class CameraDevice : IDevice{
// - interface IDevice -
public string DeviceName{get;set;}
public string DevicePath{ get; set; }
public System.Runtime.InteropServices.ComTypes.IMoniker Moniker{get;set;}
// end IDevice
//分辨率结构体
public struct Resolution{
public double Width{set;set;}
public double Height{get;set;}
}
public CameraDevice(){
this.DevicePath = string.Empty;
this.DeviceName = string.Empty;
}
}
3. 服务类，实现利用DirectShowLib获取设备的分辨率,本质还是DX接口的运用
public class DeviceService
{
// 获取系统内安装的视频输入设备~
public System.Collections.Generic.IList<IDevice> GetDevices()
{
DsDevice[] devicesOfCat = DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice);
System.Collections.Generic.IList<IDeviceInfo> list = new System.Collections.Generic.List<IDeviceInfo>();
DsDevice[] array = devicesOfCat;
for( int i = 0 ; i < array.length ; i++ ){
DsDevice dsdevice = array[i];
list.Add({new CameraDevice{
DeviceName = dsdevice.Name,
DevicePath = dsdevice.DevicePath,
Moniker = dsdevice.Mon
}});
}
return list;
}
public System.Collections.Generic.IList<CameraDevice.Resolution> GetResolutions(string devicePath)
{
//获取设备
System.Collections.Generic.IList<IDevice> devices= this.GetDevices();
foreach( IDevice current in devices)
{
//获取当前指定设备路径的关联分辨率
if( current.DevicePath == devicePath ){
return this.GetResolutions(current);
}
}
return new System.Collections.Generic.List<CameraDevice.Resolution>();
}
private System.Collections.Generic.IList<CameraDevice.Resolution> GetResolutions(IDevice deivce)
{
System.Collections.Generic.List<CameraDevice.Resolution> list = new System.Collections.Generic.List<CameraDevice.Resolution>();
IBaseFilter vSource = null;
IFilterGraph2 filterGraph = new FilterGraph() as IFilterGraph2;
if (filterGraph == null)
{
return list;
}
filterGraph.AddSourceFilterForMoniker(deivce.Moniker, null, deivce.DeviceName, out vSource);
IPin pin = DsFindPin.ByCategory(vSource, PinCategory.Capture, 0);
VideoInfoHeader videoInfoHeader = new VideoInfoHeader();
IEnumMediaTypes enumMediaTypes;
pin.EnumMediaTypes(out enumMediaTypes);
AMMediaType[] array = new AMMediaType[1];
System.IntPtr zero = System.IntPtr.Zero;
enumMediaTypes.Next(1, array, zero);
int num = 0;
int num2 = 0;
while (array.Any<AMMediaType>() && array[0] != null)
{
System.Runtime.InteropServices.Marshal.PtrToStructure(array[0].formatPtr, videoInfoHeader);
if (videoInfoHeader.BmiHeader.Size != 0 && videoInfoHeader.BmiHeader.BitCount != 0)
{
if ((int)videoInfoHeader.BmiHeader.BitCount > num2)
{
list.Clear();
num = 0;
num2 = (int)videoInfoHeader.BmiHeader.BitCount;
}
list.Add(new CameraDevice.Resolution
{
Width = (double)videoInfoHeader.BmiHeader.Width,
Height = (double)videoInfoHeader.BmiHeader.Height
});
if (videoInfoHeader.BmiHeader.Width > num || videoInfoHeader.BmiHeader.Height > num)
{
num = System.Math.Max(videoInfoHeader.BmiHeader.Width, videoInfoHeader.BmiHeader.Height);
}
}
enumMediaTypes.Next(1, array, zero);
}
return (from d in list.Distinct<CameraDevice.Resolution>()
orderby d.Width
select d).ToList<CameraDevice.Resolution>();
}
}
4. 测试：新建WPF工程，一个按钮。 click事件
private void _btnGetDevices_Click_1(object sender, RoutedEventArgs e) { DeviceService videoservice = new DeviceService(); IList<IDevice> deviceinfos = videoservice.GetDevices(); if (deviceinfos != null && deviceinfos.Count > 0) { IDevice d = deviceinfos[0]; List<CameraDevice.Resolution> ls = videoservice.GetResolutions(d).ToList<CameraDevice.Resolution>(); string strmsg = string.Empty; strmsg += "device count:" + deviceinfos.Count.ToString() + "\n"; strmsg += "device name:" + d.DeviceName + "\n"; foreach (CameraDevice.Resolution cur in ls) { strmsg += "RW:" + cur.Width + " ; RH: " + cur.Height + "\n"; } MessageBox.Show(strmsg); } }
WPF中使用DirectShowLib枚举摄像头设备和分辨率
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原文地址：http://www.cnblogs.com/visonme/p/4897540.html
