private void Worker()
{
float fY1;
float fY2;
float scale;
// calculate picFrame just once
if (picFrame == RectangleF.Empty)
{
// check if device has retina display, if so scale factor by 2
if (UIScreen.MainScreen.RespondsToSelector(new MonoTouch.ObjCRuntime.Selector(@"scale")) &&
UIScreen.MainScreen.Scale == 2)
scale = 2f;
else
scale = 1f;
// check if the device is an ipad or an iphone
if (UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Phone)
{
fY1 = 146f / UIScreen.MainScreen.Bounds.Height * scale;
fY2 = 157f / UIScreen.MainScreen.Bounds.Height * scale;
}
else
{
// ipad - constants probably need to be modified if running at native screen res
fY1 = 146f / UIScreen.MainScreen.Bounds.Height * scale;
fY2 = 157f / UIScreen.MainScreen.Bounds.Height * scale;
}
picFrame = new RectangleF(0, UIScreen.MainScreen.Bounds.Height * fY1, UIScreen.MainScreen.Bounds.Width * scale, UIScreen.MainScreen.Bounds.Height * fY2);
}
if(hints==null)
{
var list = new ArrayList();
list.Add(com.google.zxing.BarcodeFormat.EAN_8);
list.Add(com.google.zxing.BarcodeFormat.EAN_13);
hints = new Hashtable();
hints.Add(com.google.zxing.DecodeHintType.POSSIBLE_FORMATS, list);
hints.Add(com.google.zxing.DecodeHintType.NEED_RESULT_POINT_CALLBACK, new ResultCallBack(this));
}
if(_multiFormatOneDReader == null)
{
_multiFormatOneDReader = new com.google.zxing.oned.MultiFormatOneDReader(hints);
}
// Capturing screen image
using (var screenImage = CGImage.ScreenImage.WithImageInRect(picFrame))
{
_theScreenImage = UIImage.FromImage(screenImage);
Bitmap srcbitmap = new System.Drawing.Bitmap(_theScreenImage);
LuminanceSource source = null;
BinaryBitmap bitmap = null;
try {
source = new RGBLuminanceSource(srcbitmap, screenImage.Width, screenImage.Height);
bitmap = new BinaryBitmap(new HybridBinarizer(source));
com.google.zxing.common.BitArray row = new com.google.zxing.common.BitArray(screenImage.Width);
int middle = screenImage.Height >> 1;
int rowStep = System.Math.Max(1, screenImage.Height >> (4));
for (int x = 0; x < 9; x++)
{
// Scanning from the middle out. Determine which row we're looking at next:
int rowStepsAboveOrBelow = (x + 1) >> 1;
bool isAbove = (x & 0x01) == 0; // i.e. is x even?
int rowNumber = middle + rowStep * (isAbove?rowStepsAboveOrBelow:- rowStepsAboveOrBelow);
if (rowNumber < 0 || rowNumber >= screenImage.Height)
{
// Oops, if we run off the top or bottom, stop
break;
}
// Estimate black point for this row and load it:
try
{
row = bitmap.getBlackRow(rowNumber, row);
var resultb = _multiFormatOneDReader.decodeRow(rowNumber, row, hints);
if(resultb.Text!=null)
{
BeepOrVibrate();
_parentViewController.BarCodeScanned(resultb);
break;
}
else {
continue;
}
}
catch (ReaderException re)
{
continue;
}
}
// var result = _barcodeReader.decodeWithState(bitmap);
//
// if(result.Text!=null)
// {
// _multiFormatOneDReader = null;
// BeepOrVibrate();
// _parentViewController.BarCodeScanned(result);
// }
} catch (Exception ex) {
Console.WriteLine(ex.Message);
}
finally {
if(bitmap!=null)
bitmap = null;
if(source!=null)
source = null;
if(srcbitmap!=null)
srcbitmap = null;
}
}
}
private void Worker()
{
//iphone 4 : 960 x 640
//iphone 3 : 320 x 480
if(DeviceHardware.Version == DeviceHardware.HardwareVersion.iPhone4)
{
picFrame = new RectangleF(0, 146*2, 320*2, 157*2);
}
if(hints==null)
{
var list = new ArrayList();
list.Add(com.google.zxing.BarcodeFormat.EAN_8);
list.Add(com.google.zxing.BarcodeFormat.EAN_13);
hints = new Hashtable();
hints.Add(com.google.zxing.DecodeHintType.POSSIBLE_FORMATS, list);
hints.Add(com.google.zxing.DecodeHintType.NEED_RESULT_POINT_CALLBACK, new ResultCallBack(this));
}
if(_multiFormatOneDReader == null)
{
_multiFormatOneDReader = new com.google.zxing.oned.MultiFormatOneDReader(hints);
}
// Capturing screen image
using (var screenImage = CGImage.ScreenImage.WithImageInRect(picFrame))
{
_theScreenImage = UIImage.FromImage(screenImage);
Bitmap srcbitmap = new System.Drawing.Bitmap(_theScreenImage);
LuminanceSource source = null;
BinaryBitmap bitmap = null;
try {
source = new RGBLuminanceSource(srcbitmap, screenImage.Width, screenImage.Height);
bitmap = new BinaryBitmap(new HybridBinarizer(source));
com.google.zxing.common.BitArray row = new com.google.zxing.common.BitArray(screenImage.Width);
int middle = screenImage.Height >> 1;
int rowStep = System.Math.Max(1, screenImage.Height >> (4));
for (int x = 0; x < 9; x++)
{
// Scanning from the middle out. Determine which row we're looking at next:
int rowStepsAboveOrBelow = (x + 1) >> 1;
bool isAbove = (x & 0x01) == 0; // i.e. is x even?
int rowNumber = middle + rowStep * (isAbove?rowStepsAboveOrBelow:- rowStepsAboveOrBelow);
if (rowNumber < 0 || rowNumber >= screenImage.Height)
{
// Oops, if we run off the top or bottom, stop
break;
}
// Estimate black point for this row and load it:
try
{
row = bitmap.getBlackRow(rowNumber, row);
var resultb = _multiFormatOneDReader.decodeRow(rowNumber, row, hints);
if(resultb.Text!=null)
{
BeepOrVibrate();
_parentViewController.BarCodeScanned(resultb);
break;
}
else {
continue;
}
}
catch (ReaderException re)
{
continue;
}
}
// var result = _barcodeReader.decodeWithState(bitmap);
//
// if(result.Text!=null)
// {
// _multiFormatOneDReader = null;
// BeepOrVibrate();
// _parentViewController.BarCodeScanned(result);
// }
} catch (Exception ex) {
Console.WriteLine(ex.Message);
}
finally {
if(bitmap!=null)
bitmap = null;
if(source!=null)
source = null;
if(srcbitmap!=null)
srcbitmap = null;
}
}
}