捕获类型错误 AS3 时出现问题

发布于 2024-11-03 02:36:50 字数 1141 浏览 1 评论 0原文

您好，我正在通过 XML 将图像和数据加载到 Flash 中。由于各种原因，某些数据丢失了图像或根本没有图像。当图像 URL 为 null 时，flash 返回消息 TypeError: Error #2007: Parameter url must be non-null。我一直在尝试使用 IO 错误事件捕获此错误，但我不确定这是否是执行此操作的正确方法，因为我似乎无法让它工作。这给我带来了一个问题，因为当我将项目添加到舞台时，数据与图像不匹配，一旦我能够捕获此错误，我想要做的就是将默认图像推入 _trackArray 中，我将然后用于将项目添加到舞台上。

private function callTracks(): void {

        for (var i:Number = 0; i < _tracksTotal; i++){
                var _trackpicUrl = _trackImage[i];

                //trace(_trackImage[i]);

                var _trackpicLoader = new Loader();


                _trackpicLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, trackpicLoaded);
                _trackpicLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, loadError);
                _trackpicLoader.load(new URLRequest(_trackpicUrl));


                _trackpicLoader.name = i+1;


                _trackArray.push(_trackpicLoader);
                _containerMc.addChildAt(_trackpicLoader, _ringCounter);


    }

}

private function loadError(e:IOErrorEvent): void {
        trace("IO Error: " + e);

}

原文

Hi I am loading images and data into flash via XML. Some bits of data are missing an image or just don't have one for various reasons. When the image URL is null flash returns the message TypeError: Error #2007: Parameter url must be non-null. I have been trying to catch this error using IO error event but I am unsure if this is the the correct method for doing this as I can't seem to get it working. This is causing a problem for me because when I add the items to the stage the data doesn't match the images and what I would like to do once I am able to capture this error is push a default image into the _trackArray which i will then use to add items to the stage.

private function callTracks(): void {

        for (var i:Number = 0; i < _tracksTotal; i++){
                var _trackpicUrl = _trackImage[i];

                //trace(_trackImage[i]);

                var _trackpicLoader = new Loader();


                _trackpicLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, trackpicLoaded);
                _trackpicLoader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, loadError);
                _trackpicLoader.load(new URLRequest(_trackpicUrl));


                _trackpicLoader.name = i+1;


                _trackArray.push(_trackpicLoader);
                _containerMc.addChildAt(_trackpicLoader, _ringCounter);


    }

}

private function loadError(e:IOErrorEvent): void {
        trace("IO Error: " + e);

}

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⒈起吃苦の倖褔 2024-11-10 02:36:50

那么为什么不在分配给 _trackpicUrl 时测试该值是否为 null 呢？

var _trackpicUrl:String;
if(_trackImage[i] == null) {
    //do whatever you need to handle the null
    _trackImage[i] = "myDefault.url";
}
_trackpicUrl = _trackImage[i];

So why not just test if the value is null when you assign to _trackpicUrl?

var _trackpicUrl:String;
if(_trackImage[i] == null) {
    //do whatever you need to handle the null
    _trackImage[i] = "myDefault.url";
}
_trackpicUrl = _trackImage[i];

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