带有WebView的Mac屏幕保护程序崩溃

大家好,

我有一个用obj-c和可可制作的屏幕保护程序。在OsX 10.6.2下,除了以下各项之外,其他一切都可以正常工作。 在我的屏幕保护程序中,我有一个运行着一些应用程序的WebView。当我试图通过javascript调用objective-c应用程序(屏幕保护程序)时,出现错误,屏幕保护程序和系统首选项面板崩溃。

系统首选项[86666] ***由于未捕获异常“NSInvalidArgumentException”而终止应用程序

原因:'-[NSCFArray drain]:无法识别的选择器已发送到实例0x20049b1e0'

***第一次抛出时调用堆栈:(

1 libobjc.A.dylib 0x00007fff81f130f3 objc_异常_抛出+45
2 CoreFoundation 0x00007fff812931c0+[NSObject(NSObject)不识别选择器:+0
转发 + 751
4 CoreFoundation 0x00007fff812091d8\u CF\u转发\u准备\u 0+232 5网络存储0x00007fff847adee0(u zn3JSC8绑定12对象虚拟现实环境+48

7 JavaScriptCore 0x00007fff80862b66 NK3JSC7JSValue3getEPNS\u 9执行状态KNS\u 10标识符\u 12 PropertySlote+486
)

我知道这看起来像是内存泄漏,但正如您在代码中看到的,我几乎没有分配对象。

只有当我从屏幕保护程序系统prefs用“测试”按钮启动屏幕保护程序时,才会发生这种情况。

也许有人知道错误可能来自哪里。下面是实现中的一些代码:

@implementation ScreensaverView

- (id)initWithFrame:(NSRect)frame isPreview:(BOOL)isPreview {

    self = [super initWithFrame:frame isPreview:isPreview];

    if (self) {

        [self setAnimationTimeInterval:-1];
        [self setAutoresizesSubviews:YES];

        // ::::::::::::::::::::::: Init stuff ::::::::::::::::::    

        // init 
        quitFlag = false;
        previewMode = isPreview;

        // find out the path the screensaver bundle
        pMainBundle = [NSBundle bundleForClass:[self class]];
        pBundlePath = [pMainBundle bundlePath];

        // read Info.plist
        infoDict = [pMainBundle infoDictionary];
    }

    return self;
}

- (void)startAnimation
{   
    [super startAnimation];

    // combine: bundle path + filename for screensaver file 
    NSString *pathToScreensaver = [NSString stringWithString:pBundlePath];
    NSString *valueScreensaverFile;

    if(!previewMode)
    {
        valueScreensaverFile = [infoDict objectForKey:@"ScreensaverFile"];
    }
    else 
    {
        valueScreensaverFile = [infoDict objectForKey:@"PreviewFile"];
    }

    // add filename to bundle path
    pathToScreensaver = [pathToScreensaver stringByAppendingString:valueScreensaverFile];

    // complete NSURL to the screensaver file
    NSURL *screensaverUrl = [NSURL fileURLWithPath: pathToScreensaver];

    webView = [WebView alloc];
    [webView initWithFrame:[self frame]];
    [webView setDrawsBackground:NO];

    // delegation policy for interactive mode
    [webView setPolicyDelegate: self];
    [webView setUIDelegate:self];

    // load screensaver
    [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:screensaverUrl]];

    scriptObject = [webView windowScriptObject];
    [scriptObject setValue:self forKey:@"screensaver"];

    [self addSubview:webView];
}

- (void)stopAnimation
{   
    [[webView mainFrame] stopLoading];
    [webView removeFromSuperview];
    [webView release];
    [super stopAnimation];
}

+ (BOOL)isSelectorExcludedFromWebScript:(SEL)selector 
{       
    if (selector == @selector(quitScreenSaver)) {
        return NO;
    }

    if(selector == @selector(gotoUrl:) ){
        return NO;
    }

    return YES;
}

+(NSString *)webScriptNameForSelector:(SEL)selector
{   
    if(selector == @selector(quitScreenSaver))
    {
        return @"quitNoOpen";
    }

    if(selector == @selector(gotoUrl:))
    {
        return @"openAndQuit";
    }

    return nil;
}

- (void) quitScreenSaver
{
    quitFlag = true;
    [super stopAnimation];
}

- (void) gotoUrl:(NSString *) destinationURL 
{   
    if(destinationURL == NULL)
    {
        return;
    }

    NSString * path    = destinationURL;
    NSURL    * fileURL = [NSURL URLWithString:path];
    [[ NSWorkspace sharedWorkspace ] openURL:fileURL];
    [self quitScreenSaver];
}

@end

我希望这些代码足够让您看到一些问题/解决方案。