public async Task <bool> Initialize(MediaCapture mediaCap)
{
var mediaFrameSourceFinder = new MediaFrameSourceFinder();
// We want a source of media frame groups which contains a color video
// preview (and we'll take the first one).
var populated = await mediaFrameSourceFinder.PopulateAsync(
MediaFrameSourceFinder.ColorVideoPreviewFilter,
MediaFrameSourceFinder.FirstOrDefault);
if (populated)
{
// We'll take the first video capture device.
var videoCaptureDevice =
await VideoCaptureDeviceFinder.FindFirstOrDefaultAsync();
// Make a processor which will pull frames from the camera and run
// ZXing over them to look for QR codes.
frameProcessor = new QrCaptureFrameProcessor(
mediaFrameSourceFinder,
videoCaptureDevice,
MediaEncodingSubtypes.Bgra8,
mediaCap);
return(true);
}
return(false);
}
public static async void ScanFirstCameraForQrCode(
Action <Result> resultCallback,
TimeSpan timeout)
{
Result result = null;
// Note - I keep this frame processor around which means keeping the
// underlying MediaCapture around because when I didn't keep it
// around I ended up with a crash in Windows.Media.dll related
// to disposing of the MediaCapture.
// So...this isn't what I wanted but it seems to work better :-(
if (frameProcessor == null)
{
var mediaFrameSourceFinder = new MediaFrameSourceFinder();
// We want a source of media frame groups which contains a color video
// preview (and we'll take the first one).
var populated = await mediaFrameSourceFinder.PopulateAsync(
MediaFrameSourceFinder.ColorVideoPreviewFilter,
MediaFrameSourceFinder.FirstOrDefault);
if (populated)
{
// We'll take the first video capture device.
var videoCaptureDevice =
await VideoCaptureDeviceFinder.FindFirstOrDefaultAsync();
if (videoCaptureDevice != null)
{
// Make a processor which will pull frames from the camera and run
// ZXing over them to look for QR codes.
frameProcessor = new QrCaptureFrameProcessor(
mediaFrameSourceFinder,
videoCaptureDevice,
MediaEncodingSubtypes.Bgra8);
// Remember to ask for auto-focus on the video capture device.
frameProcessor.SetVideoDeviceControllerInitialiser(
vd => vd.Focus.TrySetAuto(true));
}
}
}
if (frameProcessor != null)
{
// Process frames for up to 30 seconds to see if we get any QR codes...
await frameProcessor.ProcessFramesAsync(timeout);
// See what result we got.
result = frameProcessor.QrZxingResult;
}
// Call back with whatever result we got.
resultCallback(result);
}
public static async void ScanFirstCameraForQrCode(
Action <Result> resultCallback,
TimeSpan timeout)
{
Result result = null;
var mediaFrameSourceFinder = new MediaFrameSourceFinder();
// We want a source of media frame groups which contains a color video
// preview (and we'll take the first one).
var populated = await mediaFrameSourceFinder.PopulateAsync(
MediaFrameSourceFinder.ColorVideoPreviewFilter,
MediaFrameSourceFinder.FirstOrDefault);
if (populated)
{
// We'll take the first video capture device.
var videoCaptureDevice =
await VideoCaptureDeviceFinder.FindFirstOrDefaultAsync();
if (videoCaptureDevice != null)
{
// Make a processor which will pull frames from the camera and run
// ZXing over them to look for QR codes.
var frameProcessor = new QrCaptureFrameProcessor(
mediaFrameSourceFinder,
videoCaptureDevice,
MediaEncodingSubtypes.Bgra8);
// Remember to ask for auto-focus on the video capture device.
frameProcessor.SetVideoDeviceControllerInitialiser(
vd => vd.Focus.TrySetAuto(true));
// Process frames for up to 30 seconds to see if we get any QR codes...
await frameProcessor.ProcessFramesAsync(timeout);
// See what result we got.
result = frameProcessor.QrZxingResult;
}
}
// Call back with whatever result we got.
resultCallback(result);
}
