http://imagej.273.s1.nabble.com/Pointing-to-a-fixed-directory-structure-tp3690781p3690784.html
OK, I checked. I input an 8-bit image so
wasn't correct. When I changed to
What surprises me isn't not being able to upcast to an int.
> Thank you both, the ("\\") fixed the path and the short test plugin
> generates dialog windows at points through the code and also displays the
> path to the test1.bmp. However, i have been stumped by my inability to read
> and display the image to verify that i have successfully imported the image
> into my function. Hopefully you can help me again.
>
> my simple test code is:
>
> public class FileGrabTest_ implements PlugIn {
>
> private String title;
>
> ImagePlus ip1;
> private String imagePath1 = "";
> private String imagePath2 = "";
> private String imagePath3 = "";
>
>
> public void run(String arg) {
> IJ.showMessage(title, "Running the first Test");
>
> // line 29 in error report
> test_file_grab();
> }
>
> public void test_file_grab() {
>
> String imagePath1 = IJ.getDirectory("C:\\Users\\draby\\Documents");
>
> imagePath2 = imagePath1+"test1.bmp";
> imagePath3 = IJ.openAsString(imagePath2);
>
> ImagePlus rgbBackGround = IJ.openImage(imagePath3);
>
> IJ.showMessage(title, imagePath2);
>
> IJ.showMessage(title, "Running the second Test");
>
> // extract image information and pixel data
> // line 47 in error report
> ImageProcessor bg_ip = rgbBackGround.getProcessor();
> int[] bg_pixels = (int[]) bg_ip.getPixels();
>
> rgbBackGround.show();
> rgbBackGround.updateAndDraw();
> }
> }
>
> and the error message is:
> java.lang.NullPointerException
> at HandDet_.test_file_grab(HandDet_.java:47)
> at HandDet_.run(HandDet_.java:29)
> at ij.IJ.runUserPlugIn(IJ.java:179)
> at ij.IJ.runPlugIn(IJ.java:146)
> at ij.Executer.runCommand(Executer.java:122)
> at ij.Executer.run(Executer.java:59)
> at java.lang.Thread.run(Unknown Source)
>
> I am sorry to bother you with what is probably trivial but i have confused
> myself over the past 8 hours to the point where i cant see the "plug for
> the
> wires". Any further assistance would be greatly appreciated.
> Thank you, Dean
>
>
> On Tue, Oct 13, 2009 at 12:24 PM, Curtis Rueden <
[hidden email]> wrote:
>
> > Hi Dean,
> >
> > I have tried to read 3 bitmap images from the same directory and have
> been
> > > unable to set the correct path. Could you let me know from which
> location
> > > the path should be set relative to (i am running Eclipse on my PC):
> > >
> >
> > Backslash literals in Java must be escaped with another backslash ("\\"),
> > because backslash is used to represent other special characters (tab is
> > "\t", newline is "\n", etc.).
> >
> > So in your code, try:
> >
> > String imagePath =
> > IJ.getDirectory("C:\\Code\\Java\\MyPlugin\\images\\test1.bmp");
> >
> > It would probably also work with forward slashes.
> >
> > -Curtis
> >
> > On Tue, Oct 13, 2009 at 1:52 PM, Dean Raby <
[hidden email]> wrote:
> >
> > > I am new to writing Java (2 months), but find the ImageJ a very
> > interesting
> > > tool, and hope to write a few plugins to "quickly" test some imaging
> > > concepts. This work requires me to compare three images. The available
> > > examples, i have found, show the image information being taken from the
> > > image selected via the GUI however i need my plugin to read the
> contents
> > > from a fixed directory on the host PC. The image names will also be
> hard
> > > coded by the camera attached to the PC. If you have a pointer to a
> > similar
> > > plugin or example it would be greatly appreciated.
> > >
> > > I have tried to read 3 bitmap images from the same directory and have
> > been
> > > unable to set the correct path. Could you let me know from which
> location
> > > the path should be set relative to (i am running Eclipse on my PC):
> > >
> > > plugin directory path: C:\Code\Java\MyPlugin\src\test_.java
> > > image directory path: C:\Code\Java\MyPlugin\images\xxx.bmp
> > >
> > > I have tried using the full system path and the relative path and
> neither
> > > one seems to work.
> > >
> > > I am trying to use, to point to and open a test image:
> > >
> > > String imagePath =
> > > IJ.getDirectory("C:\Code\Java\MyPlugin\images\test1.bmp");
> > > dirPath = IJ.openAsString(imagePath);
> > > ImagePlus imp2 = IJ.openImage(dirPath);
> > >
> > > In the above code, the "slash" direction reflects that shown on the
> > Eclipse
> > > tool, please let me know if is need to parse this and change the
> "slash"
> > > direction.
> > >
> > > thank you, Dean
> > >
> >
>