Java ENOENT（没有这样的文件或目录）当有文件时
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/19992706/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
ENOENT (No such file or directory) When There Is A File There
提问by Steve Smith
I am trying to share A PNG with ShareActionProvider in Android. When I open the PNG to the Uri, it says there is no file found.
open failed: ENOENT (No such file or directory)even though I have gone into the file system and have seen it myself. I have tried it on my phone and the AVD with the save error. I have looked around but have found no answers. Any help would be much appreciated.
我正在尝试在 Android 中与 ShareActionProvider 共享 A PNG。当我打开 PNG 到 Uri 时，它说没有找到文件。
open failed: ENOENT (No such file or directory)即使我已经进入文件系统并亲自看过它。我已经在我的手机和 AVD 上尝试过，但保存错误。我环顾四周，但没有找到答案。任何帮助将非常感激。
Here is where I try to open the file:
这是我尝试打开文件的地方：
File file = new File(getFilesDir()+"wifiqr/", "QRCode.png");
file.setReadable(true, false);
Uri uri = Uri.fromFile(file);
Intent intent = new Intent(Intent.ACTION_SEND);
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_STREAM,uri);
provider.setShareIntent(intent);
If it helps here is where I save it:
如果有帮助，这里是我保存它的地方：
String fileName = getFilesDir()+"/wifiqr/" + "QRCode.png";
etSSID.setText(fileName);
OutputStream stream = null;
try {
stream = new FileOutputStream(fileName);
bmp.compress(Bitmap.CompressFormat.PNG, 80, stream);
stream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Finally the error log:
最后是错误日志：
11-15 02:34:43.243 594-892/com.android.mms E/Mms/media: IOException caught while opening or reading stream
java.io.FileNotFoundException: /data/data/com.frostbytedev.wifiqr/fileswifiqr/QRCode.png: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:416)
at java.io.FileInputStream.<init>(FileInputStream.java:78)
at java.io.FileInputStream.<init>(FileInputStream.java:105)
at android.content.ContentResolver.openInputStream(ContentResolver.java:447)
at com.android.mms.model.MediaModel.initMediaSize(MediaModel.java:235)
at com.android.mms.model.MediaModel.<init>(MediaModel.java:74)
at com.android.mms.model.RegionMediaModel.<init>(RegionMediaModel.java:36)
at com.android.mms.model.RegionMediaModel.<init>(RegionMediaModel.java:31)
at com.android.mms.model.ImageModel.<init>(ImageModel.java:73)
at com.android.mms.ui.SlideshowEditor.changeImage(SlideshowEditor.java:163)
at com.android.mms.data.WorkingMessage.internalChangeMedia(WorkingMessage.java:640)
at com.android.mms.data.WorkingMessage.changeMedia(WorkingMessage.java:588)
at com.android.mms.data.WorkingMessage.setAttachment(WorkingMessage.java:453)
at com.android.mms.ui.ComposeMessageActivity.addImage(ComposeMessageActivity.java:3150)
at com.android.mms.ui.ComposeMessageActivity.addAttachment(ComposeMessageActivity.java:3291)
at com.android.mms.ui.ComposeMessageActivity.access00(ComposeMessageActivity.java:167)
at com.android.mms.ui.ComposeMessageActivity.run(ComposeMessageActivity.java:3236)
at com.android.mms.ui.AsyncDialog$ModalDialogAsyncTask.doInBackground(AsyncDialog.java:129)
at com.android.mms.ui.AsyncDialog$ModalDialogAsyncTask.doInBackground(AsyncDialog.java:84)
at android.os.AsyncTask.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at android.os.AsyncTask$SerialExecutor.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
Caused by: libcore.io.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
at libcore.io.IoBridge.open(IoBridge.java:400)
... 24 more
回答by Jason C
In your save code you have:
在您的保存代码中，您有：
String fileName = getFilesDir()+"/wifiqr/" + "QRCode.png";
In your load code you have no leading slash before "wifiqr/":
在您的加载代码中，“wifiqr/”之前没有前导斜杠：
File file = new File(getFilesDir()+"wifiqr/", "QRCode.png");
It seems you meant to put a "/" before "wifiqr/" in your load code. Your save code implies that getFilesDir()may not already have a trailing slash on it.
您似乎打算在加载代码中的“wifiqr/”之前放置一个“/”。您的保存代码意味着它getFilesDir()可能还没有尾部斜杠。
The name of the file it is trying to open is even printed in your log:
它尝试打开的文件的名称甚至会打印在您的日志中：
/data/data/com.frostbytedev.wifiqr/fileswifiqr/QRCode.png
It doesn't seem like you expect to have a directory named "fileswifiqr".
您似乎不希望有一个名为“fileswifiqr”的目录。
The missing link in your troubleshooting attempt was: While you knew the file you were intendingto open existed, you still needed to make sure that your code was actually opening the file you were intending to open.
在您的故障排除尝试缺失的一环是：当你知道你的文件打算以开放的存在，你还需要确保你的代码实际上是打开你打算打开该文件。
回答by ianhanniballake
The getFilesDir()is private to that specific app (i.e., other apps cannot read it) as explained in openFileOutput(which is the same directory getFilesDirreturns as per its documentation).
如openFileOutput 中所述getFilesDir()，该特定应用程序是私有的（即，其他应用程序无法读取它）（根据其文档，该目录返回的目录相同）。getFilesDir
If you are attempting to share files across applications, you follow the Sharing Files training guideto ensure that other applications can access your files.
如果您尝试跨应用程序共享文件，请遵循共享文件培训指南以确保其他应用程序可以访问您的文件。
