Java Question DirAssets

derez · May 9, 2012

How can I access File.DirAssets from a jave library ?

I use the following code with Assets = True :

B4X:

if(Assets) 
    st = File.Combine(File.getDirAssets(), "WMMC.COF") ;
else
    st = File.Combine(File.getDirRootExternal() + "/Magnetics", "WMMC.COF") ;

and get the following error:

Java.io.FileNotFoundException /AssetsDir/WMMC.COF (no such file or directory)

when using False - it works (for File.DirRootExternal).

Erel · May 9, 2012

The assets folder is not a real folder. You cannot treat it as a standard folder. The various File methods know how to treat this folder.
The simplest solution is to call File.getInputStream. This method will open correctly all files.

Firpas · Jan 27, 2015

Hi Erel:

I have a similar problem, but I can´t find "getInputStream" method after adding "import java.io. *;"

What am I doing wrong?

Thanks in advance

DonManfred · Jan 27, 2015

to create a new imputstream you should not use the iFile methods... they are available AFTER you CREATE a NEW InputStream...
Search google

B4X:

 InputStream is;
    try {
        is = new FileInputStream("file.pdf");
        // Do your work here with the is
        is.close();
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Firpas · Jan 27, 2015

Hi Manfred.

Thanks for your replay.

The problen is when the File is in File.DirAssets Folder:

I call library AddImage method from my App in B4A:

B4X:

Dim Jet as AGSpdf;
.....
Jet.AddImage(File.Combine(File.DirAssets, "imag0001.jpg")

And this is the library method applying your suggestion:

B4X:

public void AddImage(String FileFullPath)
]InputStream is;
    try {
        is = new FileInputStream(FileFullPath)
        // Do your work here with the is
        is.close();
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

java.io.FileNotFoundException: /AssetsDir/imag0001.jpg: open failed: ENOENT (No such file or directory)

Erel · Jan 27, 2015

See this tutorial: https://www.b4x.com/android/forum/threads/java-loading-files-from-a-library.38728/#content

Firpas · Jan 27, 2015

Ok Erel,

I`ve seen it, but i can´t find "getObject()" method.

those are my impot´s

B4X:

import java.io.*;
import java.util.*;
import com.pdfjet.*;
import android.util.Log;
import anywheresoftware.b4a.BA.*;
import anywheresoftware.b4a.objects.streams.*;
import anywheresoftware.b4a.ObjectWrapper.*;

Do I need anything else?

Erel · Jan 28, 2015

Read the post carefully. It is simpler. The code posted is only for the rare case where you need to work with file descriptors.

Firpas · Jan 28, 2015

rHi Erel,

Thanks for your replay.

Here is my code at library:

B4X:

        public void AddImage2(String FilePath, String FileName, float x, float y, float ScaleWidth, float ScaleHeight, int ImgType){
        try {
            FileInputStream ImgFile = GetImage(FilePath, FileName);
            ...

        } catch (Exception e){
            Log.w("B4A", Log.getStackTraceString(e));
        }
    }

    private FileInputStream GetImage(String FilePath, String FileName) throws IOException {
        if(FilePath.equals(anywheresoftware.b4a.objects.streams.File.getDirAssets())) {
            if (anywheresoftware.b4a.objects.streams.File.virtualAssetsFolder != null) {
                return GetImage(anywheresoftware.b4a.objects.streams.File.virtualAssetsFolder,
                    anywheresoftware.b4a.objects.streams.File.getUnpackedVirtualAssetFile(FileName));
            } else {
                return BA.applicationContext.openFileInput(anywheresoftware.b4a.objects.streams.File.getUnpackedVirtualAssetFile(FileName));
    //            return BA.applicationContext.openFileInput(anywheresoftware.b4a.objects.streams.File.Combine(
    //                    anywheresoftware.b4a.objects.streams.File.virtualAssetsFolder,
    //                    anywheresoftware.b4a.objects.streams.File.getUnpackedVirtualAssetFile(FileName)));
            }
        } else {
            return new FileInputStream(anywheresoftware.b4a.objects.streams.File.Combine(FilePath, FileName));
        }
    }

And it is the error log:

** Activity (main) Create, isFirst = true **

** Activity (main) Resume **

java.lang.NullPointerException
at anywheresoftware.b4a.objects.streams.File.Exists(File.java:90)
at anywheresoftware.b4a.objects.streams.File.getUnpackedVirtualAssetFile(File.java:345)
at com.ags.agspdf.AGSpdf.GetImage(AGSpdf.java:233)
at com.ags.agspdf.AGSpdf.AddImage2(AGSpdf.java:222)
at b4a.example.main._createpdfjet(main.java:465)
at b4a.example.main._button1_click(main.java:380)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:163)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:159)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:77)
at android.view.View.performClick(View.java:4660)
at android.view.View$PerformClick.run(View.java:19445)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5603)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)

I've noticed that "anywheresoftware.b4a.objects.streams.File.getUnpackedVirtualAssetFile (FileName));" one who causes the exception.

Also that "anywheresoftware.b4a.objects.streams.File.virtualAssetsFolder" is null.

As you can see, the "GetImage" method must return a Java FileInputStream.

I can create this object from a string path, ...
or from a File object, ...
or from a descriptor object.

But how do I get one of these three objects?

Thank for your help.

Erel · Jan 28, 2015

You don't need to use this code. You just need to call anywheresoftware.b4a.objects.streams.File.OpenInput

Firpas · Jan 28, 2015

Ok Erel,

this is the correct method, but returns an InputStream object and not a FileInputStream object, but I've made some changes to my code and now everything works fine.

Thanks for your help.

Java Question DirAssets

derez

Expert

Erel

B4X founder

Firpas

Active Member

Attachments

DonManfred

Expert

Firpas

Active Member

Erel

B4X founder

Firpas

Active Member

Erel

B4X founder

Firpas

Active Member

Erel

B4X founder

Firpas

Active Member

Similar Threads

Java Question DirAssets

Expert

B4X founder

Active Member

Attachments

Expert

Active Member

B4X founder

Active Member

B4X founder

Active Member

B4X founder

Active Member

Similar Threads

Privacy & Transparency

Privacy & Transparency