IKScannerDeviceView只工作一次 [英] IKScannerDeviceView is only working once

问题描述

我有一个应用程序与主窗口和辅助窗口与NSScannerDeviceView在其中。
的想法是将图像扫描到内存，并将其放入主窗口中的NSImageView。

I have an app with a main window and a secondary window with an NSScannerDeviceView in it. The idea is to scan an image to memory and place it into an NSImageView in the main window.

到目前为止很好。当扫描仪窗口打开时，我可以扫描一个图像，它被正确放置到NSImageView。

So far so good. When the scanner window is opened I can scan an image and it is placed correctly in to the NSImageView.

问题是，我可以一遍又一遍地扫描，关闭扫描窗口并重新打开它NSScannerDeviceView不再工作。我确定解决方案比较简单，但因为我还在学习obj / c /可可，这让我很难。

The problem is this, I can scan again and again but if I close the scan window and re-open it the NSScannerDeviceView no longer works. I'm sure the solution is relatively simple but as I'm still learning obj-c / cocoa it's got me stumped.

我使用的代码如下：ScanWindowController.h

The code I'm using is as follows: ScanWindowController.h

#import <Cocoa/Cocoa.h>
#import <Quartz/Quartz.h>
#import <ImageCaptureCore/ImageCaptureCore.h>

@interface ScanWindowController : NSWindowController <IKScannerDeviceViewDelegate, ICScannerDeviceDelegate, ICDeviceBrowserDelegate> {

ICDeviceBrowser *mDeviceBrowser;

}

@property (strong) IBOutlet IKScannerDeviceView *ScannerView;

@end

和：ScannerWindowController.m

and: ScannerWindowController.m

#import "ScanWindowController.h"
#import "AppDelegate.h"

@interface ScanWindowController ()

@end

@implementation ScanWindowController

@synthesize ScannerView;

- (id)init
{
    if ( ! (self = [super initWithWindowNibName: @"ScanWindowController"]) ) {
        return nil;
    }

mDeviceBrowser = [[ICDeviceBrowser alloc] init];
mDeviceBrowser.delegate = self;
mDeviceBrowser.browsedDeviceTypeMask = ICDeviceLocationTypeMaskLocal|ICDeviceLocationTypeMaskRemote|ICDeviceTypeMaskScanner;
[mDeviceBrowser start];

return self;
}

- (void)windowDidLoad
{
    [super windowDidLoad];
}


- (void)windowWillClose:(NSNotification *)notification {
    [mDeviceBrowser stop];
}


- (void)scannerDeviceView:(IKScannerDeviceView *)scannerDeviceView didScanToURL:(NSURL *)url fileData:(NSData *)data error:(NSError *)error
{

    if(!error) {

        [(AppDelegate*)[[NSApplication sharedApplication] delegate] recieveScannedData:data];

    }

}


- (void)scannerDeviceDidBecomeAvailable:(ICScannerDevice*)scanner;
{

[scanner requestOpenSession];
}


- (void)deviceBrowser:(ICDeviceBrowser*)browser didAddDevice:(ICDevice*)addedDevice moreComing:(BOOL)moreComing
{


    if ( (addedDevice.type & ICDeviceTypeMaskScanner) == ICDeviceTypeScanner )
    {

        [ScannerView setScannerDevice:(ICScannerDevice*)addedDevice];

}
}


-(void)deviceBrowser:(ICDeviceBrowser *)browser didRemoveDevice:(ICDevice *)device moreGoing:(BOOL)moreGoing
{
[device requestCloseSession];
}


-(void)didRemoveDevice:(ICDevice*)removedDevice
{
    [removedDevice requestCloseSession];
}


@end

推荐答案

我已经解决了这个问题（在和苹果交谈后），结果是：

I have solved this problem (after talking to Apple), and the result is this:

NSScannerDeviceView在窗口初始化时被激活，但是因为这不会被再次调用，并且NSScannerDeviceView在窗口关闭时关闭，它不会被重新激活。

The NSScannerDeviceView is activated when the window is initialised, however as this doesn't get called again and the NSScannerDeviceView is closed when the window is closed, it never gets reactivated.

解决方案是创建一个新的方法scannerReopen），并在每次打开窗口时调用它：

The solution was to create a new method (scannerReopen) and call it each time the window is opened as follows:

#import <Cocoa/Cocoa.h>
#import <Quartz/Quartz.h>
#import <ImageCaptureCore/ImageCaptureCore.h>

@interface ScanWindowController : NSWindowController <IKScannerDeviceViewDelegate, ICScannerDeviceDelegate, ICDeviceBrowserDelegate> {

ICDeviceBrowser *mDeviceBrowser;

}

@property (strong) IBOutlet IKScannerDeviceView *ScannerView;

-(void)scannerReopen;

@end

和：

#import "ScanWindowController.h"
#import "AppDelegate.h"

@interface ScanWindowController ()

@end

@implementation ScanWindowController

@synthesize ScannerView;


- (id)init
{
    if ( ! (self = [super initWithWindowNibName: @"ScanWindowController"]) ) {
    return nil;
}

if(!mDeviceBrowser) {
    mDeviceBrowser = [[ICDeviceBrowser alloc] init];
    [mDeviceBrowser setDelegate:self];
    mDeviceBrowser.browsedDeviceTypeMask = ICDeviceLocationTypeMaskLocal|ICDeviceLocationTypeMaskRemote|ICDeviceTypeMaskScanner;
    [mDeviceBrowser start];
}

return self;
}

- (void)windowDidLoad
{
    [super windowDidLoad];
}


- (void)windowWillClose:(NSNotification *)notification {
[mDeviceBrowser stop];
}


- (void)scannerDeviceView:(IKScannerDeviceView *)scannerDeviceView didScanToURL:(NSURL *)url fileData:(NSData *)data error:(NSError *)error
{
//process the scanned data...
if(!error) {

    [(AppDelegate*)[[NSApplication sharedApplication] delegate] receiveScannedData:data];

}

}


- (void)scannerDeviceDidBecomeAvailable:(ICScannerDevice*)scanner;
{

[scanner requestOpenSession];
}


- (void)deviceBrowser:(ICDeviceBrowser*)browser didAddDevice:(ICDevice*)addedDevice moreComing:(BOOL)moreComing
{


if ( (addedDevice.type & ICDeviceTypeMaskScanner) == ICDeviceTypeScanner )
{

    [ScannerView setScannerDevice:(ICScannerDevice*)addedDevice];

}
}


-(void)deviceBrowser:(ICDeviceBrowser *)browser didRemoveDevice:(ICDevice *)device moreGoing:(BOOL)moreGoing
{
[device requestCloseSession];
}


-(void)didRemoveDevice:(ICDevice*)removedDevice
{
    [removedDevice requestCloseSession];
}


-(void)scannerReopen
{

[mDeviceBrowser start];

}

@end

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