我正在使用CaptureElement显示我的
Windows Store App的相机Feed.现在,当用户点击显示时,我想将照片作为流捕获,我使用下面的代码进行工作.不幸的是,返回的图像的分辨率为640 x 360,但相机(Surface RT)可以拍摄1280×800的图像,我想做.
我试过设置
encodingProperties.Height = 800;
encodingProperties.Width = 1280;
但那没有办法.那么如何更改分辨率？
private async void captureElement_Tapped(object sender,TappedRoutedEventArgs e)
{
var encodingProperties = ImageEncodingProperties.CreateJpeg();
//encodingProperties.Height = 800;
//encodingProperties.Width = 1280;
WriteableBitmap wbmp;
using (var imageStream = new InMemoryRandomAccessStream())
{
await captureMgr.CapturePhotoToStreamAsync(encodingProperties,imageStream);
await imageStream.FlushAsync();
imageStream.Seek(0);
wbmp = await new WriteableBitmap(1,1).FromStream(imageStream);
}
capturedImage.Source = wbmp;
}
解决方法
所以我终于弄清楚如何来这个,也摆脱了可怕的“HRESULT：0xC00D36B4”错误,部分是由于这里找到的代码：
http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/751b8d83-e646-4ce9-b019-f3c8599e18e0
http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/751b8d83-e646-4ce9-b019-f3c8599e18e0
我做了一些调整,这就是为什么我在这里重新发布我的代码
MediaCapture mediaCapture;
DeviceInformationCollection devices;
protected override void OnNavigatedTo(NavigationEventArgs e)
{
devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
this.mediaCapture = new MediaCapture();
if (devices.Count() > 0)
{
await this.mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings { VideoDeviceId = devices.ElementAt(1).Id,PhotoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.VideoPreview });
SetResolution();
}
}
//This is how you can set your resolution
public async void SetResolution()
{
System.Collections.Generic.IReadOnlyList<IMediaEncodingProperties> res;
res = this.mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
uint maxResolution = 0;
int indexMaxResolution = 0;
if (res.Count >= 1)
{
for (int i = 0; i < res.Count; i++)
{
VideoEncodingProperties vp = (VideoEncodingProperties)res[i];
if (vp.Width > maxResolution)
{
indexMaxResolution = i;
maxResolution = vp.Width;
Debug.WriteLine("Resolution: " + vp.Width);
}
}
await this.mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview,res[indexMaxResolution]);
}
}
虽然拍照,确保你一直使用.VideoPreview,而不是.Photo！
