ZBar的简单使用
来源:互联网 发布:java多线程讲解 编辑:程序博客网 时间:2024/05/07 20:45
NSRunLoop类声明的编程接口用于管理输入源对象。一个NSRunLoop对象处理像来自窗口系统中的鼠标和键盘事件,NSPORT对象和NSConnection连接对象这类的输入源。一个NSRunLoop对象也处理的NSTimer事件。
1.下载ZBar的第三方库,添加入工程
{
[super viewDidLoad];
//设置代理
self.readerDelegate = self;
//扫瞄图像
ZBarImageScanner *mScanner = self.scanner;
//是否显示绿色的追踪框,注意,即当选择yes的时候,这个框仅仅当扫瞄EAN和I2/5的时候才可见。
self.tracksSymbols = YES;
//是否使用备用控制组
self.showsZBarControls = YES;
//支持的方向,用ZBarOrientationMask() 和 ZBarOrientationMaskAll
self.supportedOrientationsMask = ZBarOrientationMask(UIInterfaceOrientationMaskPortrait);
//提供自定义覆盖层。注意,在showsZBarControls启用的情况下才可以用
UIView *view = [[UIView alloc] initWithFrame:self.view.bounds];
view.backgroundColor = [UIColor grayColor];
self.cameraOverlayView = view;
//裁剪扫描的图像,在扫描前图像将被裁剪到这个矩形内,这个矩形框是将图像的尺寸和宽高比标准化,
//有效值将放置矩形内介于0和1的每个轴,其中x轴对应于图像的长轴。默认为完整的图像(0,0,1,1)。
// self.scanCrop
//调节以适应预览图片
// self.cameraViewTransform
- (void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image
{
ZBarSymbol *symbol = nil;
for (symbol in symbols)
break;
NSString *text = symbol.data;
NSLog(@"%@",text);
你的应用程序不能建立或明确管理NSRunLoop对象。每个NSThread对象,包括应用程序的主线程,具有根据需要自动创建一个NSRunLoop对象。如果你需要访问当前线程的运行循环,可以使用类方法currentRunLoop。
2.添加相关库
AVFoundation.framework
CoreMedia.framework
CoreVideo.framework
libiconv.2.4.0.dylib
3.增加一个以ZBarReaderViewController为父类的控制器,并实现ZBarReaderDelegate代理
4.在控制器中添加如下代码
条形码的扫描
- (void)viewDidLoad{
[super viewDidLoad];
//设置代理
self.readerDelegate = self;
//扫瞄图像
ZBarImageScanner *mScanner = self.scanner;
//是否显示绿色的追踪框,注意,即当选择yes的时候,这个框仅仅当扫瞄EAN和I2/5的时候才可见。
self.tracksSymbols = YES;
//是否使用备用控制组
self.showsZBarControls = YES;
//支持的方向,用ZBarOrientationMask() 和 ZBarOrientationMaskAll
self.supportedOrientationsMask = ZBarOrientationMask(UIInterfaceOrientationMaskPortrait);
//提供自定义覆盖层。注意,在showsZBarControls启用的情况下才可以用
UIView *view = [[UIView alloc] initWithFrame:self.view.bounds];
view.backgroundColor = [UIColor grayColor];
self.cameraOverlayView = view;
//裁剪扫描的图像,在扫描前图像将被裁剪到这个矩形内,这个矩形框是将图像的尺寸和宽高比标准化,
//有效值将放置矩形内介于0和1的每个轴,其中x轴对应于图像的长轴。默认为完整的图像(0,0,1,1)。
// self.scanCrop
//调节以适应预览图片
// self.cameraViewTransform
//解码配置
[mScanner setSymbology:ZBAR_I25
config:ZBAR_CFG_ENABLE
to:0];
// Do any additional setup after loading the view.
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self.readerView start];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.readerView stop];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//获取扫瞄结果
id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
[mScanner setSymbology:ZBAR_I25
config:ZBAR_CFG_ENABLE
to:0];
// Do any additional setup after loading the view.
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[self.readerView start];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.readerView stop];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//获取扫瞄结果
id<NSFastEnumeration> results = [info objectForKey:ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
//仅仅是抓住第一个条形码
for (symbol in results)
break;
NSString *text = symbol.data;
//解决中文乱码问题
if ([text canBeConvertedToEncoding:NSShiftJISStringEncoding]) {
text = [NSString stringWithCString:[text cStringUsingEncoding:NSShiftJISStringEncoding] encoding:NSUTF8StringEncoding];
}
NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:@"%@",text],@"resultLabel",[info objectForKey:UIImagePickerControllerOriginalImage],@"resultImgView", nil];
[self performSelectorOnMainThread:@selector(mainAction:) withObject:dic waitUntilDone:NO];
}
- (void)mainAction:(NSDictionary *)dic
{
OtherViewController *other = [[OtherViewController alloc] init];
other.resultString = [dic objectForKey:@"resultLabel"];
other.image = [dic objectForKey:@"resultImgView"];
[self.navigationController pushViewController:other animated:YES];
// delegate is notified of decode results.
// enable pinch gesture recognition for zooming the preview/decode
// (default YES).
for (symbol in results)
break;
NSString *text = symbol.data;
//解决中文乱码问题
if ([text canBeConvertedToEncoding:NSShiftJISStringEncoding]) {
text = [NSString stringWithCString:[text cStringUsingEncoding:NSShiftJISStringEncoding] encoding:NSUTF8StringEncoding];
}
NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:@"%@",text],@"resultLabel",[info objectForKey:UIImagePickerControllerOriginalImage],@"resultImgView", nil];
[self performSelectorOnMainThread:@selector(mainAction:) withObject:dic waitUntilDone:NO];
}
{
OtherViewController *other = [[OtherViewController alloc] init];
other.resultString = [dic objectForKey:@"resultLabel"];
other.image = [dic objectForKey:@"resultImgView"];
[self.navigationController pushViewController:other animated:YES];
}
此时,我们再来看看ZBarReaderViewController中的ZBarReaderView这个类
// supply a pre-configured image scanner.//支持一个预先准备的图片扫描
- (id) initWithImageScanner: (ZBarImageScanner*) imageScanner;
// start the video stream and barcode reader.
- (id) initWithImageScanner: (ZBarImageScanner*) imageScanner;
// start the video stream and barcode reader.
//开始视频流和条形码扫描
- (void) start;
// stop the video stream and barcode reader.
- (void) start;
// stop the video stream and barcode reader.
//停止视频流和条形码扫描
- (void) stop;
// clear the internal result cache
- (void) stop;
// clear the internal result cache
//清理内部的缓存
- (void) flushCache;
// compensate for device/camera/interface orientation
- (void) flushCache;
// compensate for device/camera/interface orientation
// 适应设备的方向
- (void) willRotateToInterfaceOrientation: (UIInterfaceOrientation) orient
- (void) willRotateToInterfaceOrientation: (UIInterfaceOrientation) orient
duration: (NSTimeInterval) duration;
//代理
@property (nonatomic, assign) id<ZBarReaderViewDelegate> readerDelegate;
// access to image scanner for configuration.
@property (nonatomic, assign) id<ZBarReaderViewDelegate> readerDelegate;
// access to image scanner for configuration.
//直接对图片扫描配置
@property (nonatomic, readonly) ZBarImageScanner *scanner;
// whether to display the tracking annotation for uncertain barcodes
// (default YES).
@property (nonatomic, readonly) ZBarImageScanner *scanner;
// whether to display the tracking annotation for uncertain barcodes
// (default YES).
// 是否为不确定的条形码显示追踪
@property (nonatomic) BOOL tracksSymbols;
// color of the tracking box (default green)
@property (nonatomic) BOOL tracksSymbols;
// color of the tracking box (default green)
//追踪框的颜色,默认为绿色
@property (nonatomic, retain) UIColor *trackingColor;
// (default YES).
// 是否能对预览图进行手势缩放,默认是可以的
@property (nonatomic) BOOL allowsPinchZoom;
// torch mode to set automatically (default Auto).
@property (nonatomic) BOOL allowsPinchZoom;
// torch mode to set automatically (default Auto).
// 0为不闪光,1为闪光
// zoom scale factor applied to video preview *and* scanCrop.
// also updated by pinch-zoom gesture. clipped to range [1,maxZoom],
// defaults to 1.25
@property (nonatomic) NSInteger torchMode;
// also updated by pinch-zoom gesture. clipped to range [1,maxZoom],
// defaults to 1.25
// 施加于摄像前景画面和扫描区域的缩放
@property (nonatomic) CGFloat zoom;
- (void) setZoom: (CGFloat) zoom
// the region of the image that will be scanned. normalized coordinates.
@property (nonatomic) CGFloat zoom;
- (void) setZoom: (CGFloat) zoom
animated: (BOOL) animated;
// 图片将被扫描的区域,标准坐标
@property (nonatomic) CGRect scanCrop;
二维码的扫描
实现代理ZBarReaderViewDelegate
{
ZBarSymbol *symbol = nil;
for (symbol in symbols)
break;
NSString *text = symbol.data;
NSLog(@"%@",text);
}
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