不能得到的文件描述符资产 [英] Can't get File Descriptor for asset
问题描述
我需要得到一个DAE文件的文件描述符，这样我就可以开始偏移量和长度。我有文件描述符PNG文件，它做工精细。我用这个code这样做。
I need to get a file descriptor for a dae file, so I can get the Start Offset and Length. I have got file descriptors for png files, which work fine. I did this by using this code.
int id = 0;
id = getResources().getIdentifier("duck", "drawable", getPackageName());
mAssetDescriptor = getResources().openRawResourceFd(id);
就像我说的，我的PNG的这个工作得很好，我的DAE的，但是，这并不工作，我得到了以下异常：
Like I said, for my png's this worked fine, for my dae's, however, this did not work, I got the following exception:
android.content.res.Resources $ NotFoundException：
从文件RES /绘制/ duck.dae
绘制资源ID＃0x7f020030
android.content.res.Resources$NotFoundException: File res/drawable/duck.dae from drawable resource ID #0x7f020030
mAssetDescriptor为null。
mAssetDescriptor was null.
于是，我就做另一种方式。我把我的DAE文件的文件夹资产
So I tried to do another way. I put my dae files in the assets folder
mAssetDescriptor = getAssets().openFd("duck.dae");
这想出了一个错误
此文件不能打开一个文件
描述;它可能是COM pressed。
This file can not be opened as a file descriptor; it is probably compressed.
我想知道的，是我怎么能获得起始偏移和文件长度不使用getFileDescriptor（）和getStartOffset（）函数，因为它似乎我不能使用这些。
What I would like to know, is how I can get the Start Offset and Length of the file without using the getFileDescriptor() and getStartOffset() functions, as it seems I can not use these.
我想这也没什么看头的DAE文件都在1MB，与duck.dae我试着在500K的时刻加载。
I guess it is also worth nothing the dae files are all under 1mb, with duck.dae which i'm trying to load at the moment at 500k.
非常感谢您的帮助。
汤姆
推荐答案
这可能适用于PNG图像，因为他们不是还COM pressed，而其他大多数文件。看到这个线程：的http://groups.google.com/group/android-ndk/browse_thread/thread/8274a4c51cc9cc1d
This probably works for pngs because they are not additionally compressed, while most other files are. See this thread: http://groups.google.com/group/android-ndk/browse_thread/thread/8274a4c51cc9cc1d
尝试添加和扩展您的文件，那prevents文件被COM pressed。
Try adding and extension to your files, that prevents file from being compressed.
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