Size of a displayed image in memory

Hello,
I am interested in controlling the memory usage of an application. The application loads and displays images from files (mostly GIFs). I'd like to prevent an image from being displayed if it would occupy more memory than some preset limit. Is there a way of determining how much memory a displayed Image object would take before it is created and displayed?
Thanks in advance,
Misha

True. But Gifs are for outdated weirdos ;o)
It gets a bit complicated. Typically, screen memory will use 4-byte buffers. Non-'true'-color file formats often don't. You can store an image in various forms: typically either compatible with the file format or compatible with the screen. If you want to use an image for rendering then it should be in a screen-compatible form, otherwise rendering will be very slow. However, an image in a reduced bit depth does occupy less heap space. So if we're talking about "displayed images" then we should probably be reckoning on 32bpp images, for desktop use at least.
One thing I'm not 100% sure about is whether Toolkit produces a file- or screen-compatible image by default. And I would assume that it would be perfectly possible to implement an ImageReader which always produced 32bpp images regardless of the file bpp.

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Change image size in web display of SRM MDM 3.0

Hello,
how can I change the size of the displayed images in the catalog?
I would like to display the image in the detail of the material data in the catalog larger.
The images are stored in in the repository.
Thanks for your help.
melanie

You can change this in the Web UI interface. In the Customize Display tab you can specify the size of you images to be displayed in pixel.
The UI interface that I'm talking about is where you change your OCI mapping, Search... etc
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How to set a uniform display size of multiple intermedia image types - wher

I have read "If you want to limit the size of the file that can be uploaded, you can do this as a post generation
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Bill,
I did some tests, and was able to reproduce it. The problem is that JHeadstart distinguishes between display types fileDownload and image, but UIX uses the same <media> tag to handle both display types. It will look at runtime whether it must render a hyperlink to download the document, or to render it right away as an image.
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How to decode a set of datas received from serial port and display image on a canvas based on CVI ?

Hi !
I have received a set of datas via rs232 and it contains picture messages. I have to decode the datas first and then display them on a canvas.
I have known several functions that may be used . Such as
int SetBitmapData (int bitmapID, int bytesPerRow, int pixelDepth, int colorTable[], unsigned char bits[], unsigned char mask[]);
int CanvasDrawBitmap (int panelHandle, int controlID, int bitmapID, Rect sourceRectangle, Rect destinationRectangle);
However,I don't know how to set the following parameters according to the actual pixel values and color values.
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What's more,I have no idea how to decode the datas.
The attachment is a incomplete project. I will be very appreciated if anyone could help me .
Best regards.
xiepei
I wouldn't care success or failure,for I will only struggle ahead as long as I have been destined to the distance.
Attachments:
Decode and display image.zip ‏212 KB

Well, things are getting a bit clearer now.
1. Your image is actually 240x240 pixel (not 320x240 as you told before). The size of image data is 57600 bytes which corresponds to that frmat (I was puzzled by such a data size compared with larger image dimensions!)
2. The image is a 8-bits-per-pixel one; this means that you must provide a color palette to create the bitmap
3. You cannot simply copy image data into bitmap fields in CVI: CreateBitmap always produce an image with pixeldepth matched with display colour depth (normally 24 or 32 bpp)
All that means that you must:
1. Create the appropriate color palette with 256 colors: it may be a grayscale or color palette depending on camera characteristics. Grayscale palette can be found in my sample project, while sample colour palettes can be found here (here the description of a "standard" 8-bpp color palette)
2. Create the bits array correctly dimensioned for the color depth of your monitor
3. Get each pixel value from the camera, lookup in the color palette for the appropriate colour and create the RGB informations into the bits array in memory
4. Display the bitmap on the canvas
As a first step, I would configure my system for 256-color display setting, create a bitmap and simply copy image data into it: you should be able to get the correct image back to your screen.
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

Lightroom 2.1 will not display images.

I use previous versions of Lightroom 1.3, 1.4, 2 Beta and they work fine. Now I upgraded to Lightroom 2.1 and Masters Collection CS4 and Lightroom 2.1 will not display images. All the images I import are just a shade of gray.
When I adjust the parameters of the image the histogram is changing but the image is blank.
I have a Vista machine.
Thank you

I have a Vista Home Premium, I am on Vista X86 and I just installed LR 1.4 and is working. Also LR2 Beta was working.
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This is the sysinfo:
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Operating system: Windows Vista Home Edition Service Pack 1 (Build 6001)
Version: 6.0 [6001]
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How to display images and information

how to display images and information(e.g. like questions) on a jsp page that stored in a database

Look As far as i can see....
Utlimately every file could be expressed as a bytes buffer.
so say if you have a bean called Choice Bean which is expressed as
public class ChoiceBean{
   private String choiceid;
   private String choicedesc;
   private byte image[];
   public void setChoiceId(String choiceid){
          this.choiceid = choiceid;
    public String getChoiceId(){
           return this.choiceid;
      public void setChoiceDesc(String choicedesc){
           this.choicedesc = choicedesc;
       public String getChoiceDesc(){
           return this.choicedesc;
       public void setImage(byte image[]){
              this.image = image;
         public byte[] getImage(){
              return this.image;
}QuestionList.java:
===============
public class QuestionList{
     private List<ChoiceBean> choicelist;
      /*Other member variable declarations*/
       public List<ChoiceBean> getChoiceList(){
                /*Custom code where you may build the list by querying the DA layer*/
                 return this.choicelist;
     public int search(String choiceid){
             int index = -1;
             for(int i =0 ; i < this.choicelist.size() ; i++){
                    ChoiceBean cb = this.choicelist.get(i);
                     if(cb.getChoiceId().equals(choiceid)){
                            index = i;
                            break;
             return index;
    /* Other member method declarations */
}and you are retreving List<ChoiceBean> from DB using your query & have created a session attribute / <jsp:useBean> named ChoiceList
NOTE: sometimes your application server can go out of bounds as you are consuming a lot of memory by creating an arraylist object.
use the following methodology to display images & choices
sample.jsp:
=========
<jsp:useBean id="QuestionList" class="com.qpa.dao.QuestionList" scope="session"/>
<TABLE>
<%
/* QuestionList.getChoiceList() is a method which fetches data from the DB & returns it in form of List<ChoiceBean> */
List<ChoiceBean> choicelist = QuestionList.getChoiceList();
for(int i =0 ; i < choicelist.size() ; i++){
%>
<TR>
<TD><%!=choicelist.get(i).getChoiceId()%></TD>

<TD><IMAGE src="ImageServlet?choiceid=<%!=choicelist.get(i).getChoiceId()%>"/> </TD>
<TD><%!=choicelist.get(i).getChoiceDesc()%></TD>
</TR>
<%
%>
</TABLE>
<%
    session.remove("QuestionList");
%>
NOTE: usage of JSTL or any other custom built tag-libraries makes life more simpler in the following case
ImageServlet.java:
===============
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        byte buffer[] = null;
        HttpSession session = request.getSession(false);
        /*getting the QuestionList from the session*/
        QuestionList ql = null;
        String choiceid = new String("");
        try{
             choiceid = request.getParameter("choiceid");
             /*getting the QuestionList from the session*/
            ql = (QuestionList) session.getAttribute("QuestionList");
        } catch(Exception exp){
        if(choiceid.equals("") == false && ql != null ){
            List<ChoiceBean> clist = QuestionList.getChoiceList();
               assuming that you have created a serach method which searches the entire choice list and would give you
               the index of that object which is being refered by unique choiceid and returns -1 if not found
            int index = QuestionList.search(choiceid);
            if(index != -1){
               ChoiceBean cb = clist.get(index);
               buffer = cb.getImage();
        if(buffer != null){
             // assuming that we have stored images in JPEG format only
             JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(new ByteArrayInputStream(buffer));
             BufferedImage image =decoder.decodeAsBufferedImage();
             response.setContentType("image/jpeg");
             // Send back image
             ServletOutputStream sos = response.getOutputStream();
             JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
             encoder.encode(image);
        } else {
           response.setContentType("text/html");
           response.getWriter().println("<b>Image data not found</b>");
}However,i still feel there are few loopholes with this approach where Application Server can eat up a lot of heap space which may result in outofmemorybound exception.
Hope this might help :)
REGARDS,
RaHuL

QuickPreview and Preview won't display images

OK. We're on a MacPro 5,1 and have been running mountain lion for a week or two now with no issues. all of a sudden, preview has stopped displaying images when you open them. The finder window, when in column view, will not display the preview, and hitting spacebar to go into QuickView will just open a blank white screen in the size of the image. Image icons for the pgs do display. Interestingly enough, Screen sharing also is displaying blank white screens.
The system config is below:
Model Name:          Mac Pro
Model Identifier:          MacPro5,1
Processor Name:          Quad-Core Intel Xeon
Processor Speed:          2.8 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          8 MB
Memory:          8 GB
Processor Interconnect Speed:          4.8 GT/s
Boot ROM Version:          MP51.007F.B03
SMC Version (system):          1.39f11
SMC Version (processor tray):          1.39f11
Serial Number (system):
Serial Number (processor tray):
Hardware UUID:          DCB72D90-0983-55C8-AD71-E92CCFD886E4
We have 2 x ATI Radeon HD 5770 video cards running a total of 3 displays (2 at 1024x768, 1 at 1280 x 1024)
Any suggestions as to what's gone wrong?

Try deleting the Finder .plists.
You need to look in your user Library/Preferences for the .plist. Hold down the option key while using the Finder "Go To Folder" command. Enter ~`/Library. Delete the .plist(s) for the application or move them to your desktop so you can put them back. Since there are several .plists, you may want to try them one at a time You'll need to Force quit Finder to get it to relaunch (command - option- esc).
If you prefer to make your user library permanently visible, use the Terminal command found below.
http://osxdaily.com/2011/07/04/show-library-directory-in-mac-os-x-lion/
You might want to bookmark the command. I had to use it again after I installed 10.8.2. I have also been informed that if you drag the user library to Finder it will remain visible.

Open and display image in MVC layout

Hello!
I cant figure out how I shall do this in an MVC layout:
The program request user to open an image file that are then displayed in a JLabel
My setup at the moment resolve in a nullpointerexeption because it dont get any actual image file, but I dont understand what I have missed.
I can not post the whole code fo you to run because it is to big, so I post the part that are the most important. please have a look.
PicturePanel
//Import Java library
import javax.swing.*;
import java.awt.*;
public class PicturePanel extends JPanel {
     //Variables
     private ImageIcon picture;
     //Method to get information of the selected file
     PicturePanel (String fileName) {
          picture = new ImageIcon (fileName); //Get the filename
          int w = picture.getIconWidth(); //Get the image with
          int h = picture.getIconHeight(); //Get the image height
          //Set preferable size for the image (Use the properties for the selected image)
          setPreferredSize(new Dimension(w, h));
          setMinimumSize(new Dimension(w, h));
          setMaximumSize(new Dimension(w, h));
     //Method to draw the selected image
     protected void paintComponent(Graphics g) {
          super.paintComponent(g); //We invoke super in order to: Paint the background, do custom painting.
          g.drawImage(picture.getImage(), 0, 0, this); //Draw the image at its natural state
}From my model:
//Local attributes
     boolean check = false; //Used to see if a statement is true or not
     PicturePanel pp;
     JFileChooser fc;
     int returnVal;
//newFile in File menu
     public void newFile() {
          //Open a file dialog in users home catalog
          fc = new JFileChooser();
          //In response to a button click:
          returnVal = fc.showOpenDialog(pp);
          System.out.println("You pressed new in file menu");
     }From my controler:
//User press "New" in File menu
          else if (user_action.equals("New")) {
               //Call method in model class
               model.newFile();
               //Update changes
               if (model.returnVal == JFileChooser.APPROVE_OPTION) {
                    System.out.println("Hello1");
                    File f = model.fc.getSelectedFile();
                    if (model.pp != null)
                         model.pp = new PicturePanel(f.getAbsolutePath());
                    System.out.println("Hello2");
                    //Display image (Here is line 83)
                    view.setImage_DisplayArea(model.pp);
                    System.out.println("Hello3");
          }From my view:
//Sets the image to be displayed on the image_display area (Here is line 302)
     public void setImage_DisplayArea(PicturePanel pp) {
          image_display.add(pp);
     }The complet error:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
     at java.awt.Container.addImpl(Container.java:1015)You pressed new in file menu
Hello1
Hello2
     at java.awt.Container.add(Container.java:351)
     at View_Inlupp2.setImage_DisplayArea(View_Inlupp2.java:302)
     at Control_Inlupp2.actionPerformed(Control_Inlupp2.java:83)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
     at javax.swing.AbstractButton.doClick(AbstractButton.java:334)
     at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1050)
     at apple.laf.CUIAquaMenuItem.doClick(CUIAquaMenuItem.java:119)
     at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1091)
     at java.awt.Component.processMouseEvent(Component.java:5602)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3129)
     at java.awt.Component.processEvent(Component.java:5367)
     at java.awt.Container.processEvent(Container.java:2010)
     at java.awt.Component.dispatchEventImpl(Component.java:4068)
     at java.awt.Container.dispatchEventImpl(Container.java:2068)
     at java.awt.Component.dispatchEvent(Component.java:3903)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3936)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866)
     at java.awt.Container.dispatchEventImpl(Container.java:2054)
     at java.awt.Window.dispatchEventImpl(Window.java:1801)
     at java.awt.Component.dispatchEvent(Component.java:3903)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)Edited by: onslow77 on Dec 16, 2009 5:00 PM
Edited by: onslow77 on Dec 16, 2009 5:04 PM

Hello again!
Anyone that can help me figure out how to implement this in an MVC layout, I feel stuck.
I post a little program that open and display an image file so that you better can understand what I whant to do.
ShowImage
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import javax.swing.filechooser.*;
public class ShowImage extends JFrame{
     //Variables
     JFileChooser fc = new JFileChooser();
     PicturePanel pp = null;
     ShowImage () {
          super("Show"); //Title
          //Create the GUI
          JPanel top = new JPanel();
          add(top, BorderLayout.NORTH);
          JButton openBtn = new JButton("Open");
          top.add(openBtn);
          openBtn.addActionListener(new Listner());
          //Settings for the GUI
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          pack();
          setVisible(true);
     class Listner implements ActionListener {
          public void actionPerformed(ActionEvent ave) {
               int answer = fc.showOpenDialog(ShowImage.this);
               if (answer == JFileChooser.APPROVE_OPTION){
                    File f = fc.getSelectedFile();
                    //Check
                    System.out.println(f);
                    System.out.println(pp);
                    if (pp != null)
                         remove(pp); //Clean so that we can open another image
                    //Check
                    System.out.println(pp);
                    //Set the PicturePanel
                    pp = new PicturePanel(f.getAbsolutePath());
                    //Check
                    System.out.println(pp);
                    //Add PicturePanel to frame
                    add(pp, BorderLayout.CENTER);
                    validate();
                    pack();
                    repaint();
     //Main
     public static void main(String[] args) {
          new ShowImage();
}PicturePanel
//Import Java library
import javax.swing.*;
import java.awt.*;
public class PicturePanel extends JPanel {
     //Variables
     private ImageIcon picture;
     //Method to get information of the selected file
     PicturePanel (String fileName) {
          picture = new ImageIcon (fileName); //Get the filename
          int w = picture.getIconWidth(); //Get the image with
          int h = picture.getIconHeight(); //Get the image height
          //Set preferable size for the image (Use the properties for the selected image)
          setPreferredSize(new Dimension(w, h));
          setMinimumSize(new Dimension(w, h));
          setMaximumSize(new Dimension(w, h));
     //Method to draw the selected image
     protected void paintComponent(Graphics g) {
          super.paintComponent(g); //We invoke super in order to: Paint the background, do custom painting.
          g.drawImage(picture.getImage(), 0, 0, this); //Draw the image at its natural state
}//The endEdited by: onslow77 on Dec 16, 2009 7:30 PM

Display image in JPanel without saving any file to disk

Hi,
I am fetching images from database. I am saving this image, display in JPanel and delete it. But this is not actually I want.
I wish to fetch this image as stream , store in memory and display in JPanel without saving any fiel in disk.
I wonder if it is Possible or any used implementation that I can use in my project. Any idea or experienced knowledge is enough.
Thanks

In what format is the image coming to you from the database? If it's an InputStream subclass, just use javax.imageio.ImageIO:
InputStream in = getImageInputStream();
BufferedImage image = null;
try {
   image = ImageIO.read(in);
} finally {
   in.close();
// ... Display image in your JPanel as you have beenIf you receive the image as an array of bytes, use the same method as above, but with a ByteArrayInputStream:
byte[] imageData = getImageData();
ByteArrayInputStream in = new ByteArrayInputStream(imageData);
BufferedImage image = null;
try {
   image = ImageIO.read(in);
} finally {
   in.close();
// ... Display image in your JPanel as you have been

Display image in Smart camera web interface

Hi!
I need some assistance with LV-RT.
What I have succeeded is to enalble the web server on NI 17XX camera and successfully displayed a VI with Image Display on it. I thikn I got the hang of it.
What I would like to know is there another way to display images on the camera web page. I really do not need the whole VI up there just an image and a string with serial number. One way I know would work is to write an image file to the system memory and then embed that image to the web page, but I am not sure that is the best solution as writing process takes time and it is not recommended to write too often to the program memory (am I right?).
So, is there some way to assign some object to say a memory bank and display it (without having to install the runtime maybe) on the page?
Thank you for your attention,
Mart

Hey Mart,
Going back to your original question; are you looking to stream images to a web page from your smart camera or simple see what your camera is seeing when you go to a particular site? Take a look at the sample project below. It is sort of a work around, but it posts an image to a web service. Essentially it snaps an image, saves it, and then posts the saved image to a web service. You will have to change the file path for the image, then build and deploy the webservice from the project view. Also, it would be beneficial to take a look at the webservice build specifications. The webbing to view the snapped image from your local machine would then be viewable from your web browsers at the address : "http://localhost/Stream_Service/ShowImag"
Let us know if you have trouble getting this example working. Also, perhaps another visit to what your end goal is would be helpful. What was it that you had working?
Hope this helps
-Ben
Message Edited by BCho on 04-10-2009 02:27 PM
Hope this helps.
-Ben
WaterlooLabs
Attachments:
SnapWebService.zip ‏14 KB

How to display image in selection-screen of a report

Dear all ,
i want to show my image from url or from desktop to the report selection-screen . i have searched sdn and found some code . after applying it i am not able to display image in the selection-screen although it is displaying the box in which the image should appear . here i am sending my code plz verify where is the mistake .
REPORT ZPIC2.
DATA: docking TYPE REF TO cl_gui_docking_container,
picture_control_1 TYPE REF TO cl_gui_picture,
url(256) TYPE c .
PARAMETERS: A(4) DEFAULT '4' .
PARAMETERS: B(4) DEFAULT '5' .
AT SELECTION-SCREEN OUTPUT.
PERFORM show_pic.
**& Form show_pic
FORM show_pic.
CREATE OBJECT picture_control_1 EXPORTING parent = docking.
CHECK sy-subrc = 0.
CALL METHOD picture_control_1->set_3d_border
EXPORTING
border = 5.
CALL METHOD picture_control_1->set_display_mode
EXPORTING
display_mode = cl_gui_picture=>display_mode_stretch.
CALL METHOD picture_control_1->set_position
EXPORTING
height = 100
left =   150
top =    58
width = 350.
CALL METHOD picture_control_1->load_picture_from_url
EXPORTING
url = 'C:\abc.jpg' .
endif .
IF sy-subrc NE 0.
ENDIF.
ENDFORM.
CORECT ANSWERS WILL BE HIGHLY APPRECIATED AND SURELY REWARED .
THANKS ,
AMIT RANJAN

Hi,
Try this code. hope it will work.
DATA: DOCKING TYPE REF TO CL_GUI_DOCKING_CONTAINER,
      PICTURE_CONTROL_1 TYPE REF TO CL_GUI_PICTURE,
      URL(256) TYPE C,
      PIC_DATA TYPE TABLE OF W3MIME WITH HEADER LINE,
      PIC_SIZE TYPE I.
SELECTION-SCREEN BEGIN OF BLOCK B1.
PARAMETERS: A(4) DEFAULT '4' .
PARAMETERS: B(4) DEFAULT '5' .
SELECTION-SCREEN END OF BLOCK B1.
AT SELECTION-SCREEN OUTPUT.
PERFORM SHOW_PIC.
*&      Form SHOW_PIC
FORM SHOW_PIC .
CREATE OBJECT PICTURE_CONTROL_1
EXPORTING PARENT = DOCKING.
CHECK SY-SUBRC = 0.
CALL METHOD PICTURE_CONTROL_1->SET_3D_BORDER
    EXPORTING
      BORDER = 5.
CALL METHOD PICTURE_CONTROL_1->SET_DISPLAY_MODE
    EXPORTING
      DISPLAY_MODE = CL_GUI_PICTURE=>DISPLAY_MODE_STRETCH.
CALL METHOD PICTURE_CONTROL_1->SET_POSITION
    EXPORTING
      HEIGHT = 200
      LEFT   = 100
      TOP    = 20
      WIDTH = 400.
CHANGE POSITION AND SIZE ABOVE**************************
IF URL IS INITIAL.
    CALL FUNCTION 'DP_CREATE_URL'
      EXPORTING
        TYPE     = 'image'
        SUBTYPE = CNDP_SAP_TAB_UNKNOWN
        SIZE     = PIC_SIZE
        LIFETIME = CNDP_LIFETIME_TRANSACTION
      TABLES
        DATA     = PIC_DATA
      CHANGING
        URL      = URL
      EXCEPTIONS
        OTHERS   = 1.
ENDIF.
CALL METHOD PICTURE_CONTROL_1->LOAD_PICTURE_FROM_URL
    EXPORTING
      URL = 'file://D:\img.jpg'.
ENDFORM.                    " SHOW_PIC

Problems displaying images stored in SQL Server as Datatype "image"

I am trying to display an Image stored in SQL Server as
datatype
'image' and it only shows a portion of the image.
It seems to be tied to the size (kb) of the image since the
larger the
image the less of it is shown before it cuts off(sometimes it
cuts off
mid line so it's about the file size and not fitting the
image on the
screen).
Here is the code I am using that deals with the image.
[Bindable]
public var theImage:ByteArray = new ByteArray;
private function getScans_result(event:ResultEvent):void{
var imageByteArray:ByteArray = event.result[0].Image;
theImage = imageByteArray
<mx:Image id="theIMG" width="160" height="220"
source="{theImage}"/>
Any Thoughts??

I do that sort of thing using PHP and mySQL the binary part
of the image is stored in a BLOB field (Binary Large OBject) along
the rest of the information necessary for the http headers (e.g.
mime type, file name, file size) being staored in their own fields.
That info is then used to build the file using PHP. The PHP
file contains a mySQL query whos result is echoed with the
appropriate headers. The URL points at the PHP file rather than at
any saved image.
Here's the php:
<?
# display_imagebank_file.php
# Note: the ID is passed through the url e.g.
# this_files_name.php?id=1
# connect to mysql database
mysql_connect('HOST', 'USERNAME', 'PASSWORD');
mysql_select_db('DATABASE');
# run a query to get the file information
$query = mysql_query("SELECT FileName, MimeType, FileSize,
FileContents FROM blobTable WHERE ID='$id'");
# perform an error check
if(mysql_num_rows($query)==1){
$fileName = mysql_result($query,0,0);
$fileType = mysql_result($query,0,1);
$fileSize = mysql_result($query,0,2);
$fileContents = mysql_result($query,0,3);
header("Content-type: $fileType");
header("Content-length: $fileSize");
header("Content-Disposition: inline; filename=$fileName");
header("Content-Description: from imagebank");
header("Connection: close");
echo $fileContents;
}else{
$numRows = mysql_num_rows($query);
echo "File not found <br>";
echo $numRows;
echo " is the number of rows returned for id = ";
echo $ID;
?>
Hope that helps
Phil

Displaying images stored in SQL Server

Is there someway of displaying images stored within SQL
Server. Is FDS required? Prefer a method to display images without
using FDS; Web Service would be okay if that can work

I do that sort of thing using PHP and mySQL the binary part
of the image is stored in a BLOB field (Binary Large OBject) along
the rest of the information necessary for the http headers (e.g.
mime type, file name, file size) being staored in their own fields.
That info is then used to build the file using PHP. The PHP
file contains a mySQL query whos result is echoed with the
appropriate headers. The URL points at the PHP file rather than at
any saved image.
Here's the php:
<?
# display_imagebank_file.php
# Note: the ID is passed through the url e.g.
# this_files_name.php?id=1
# connect to mysql database
mysql_connect('HOST', 'USERNAME', 'PASSWORD');
mysql_select_db('DATABASE');
# run a query to get the file information
$query = mysql_query("SELECT FileName, MimeType, FileSize,
FileContents FROM blobTable WHERE ID='$id'");
# perform an error check
if(mysql_num_rows($query)==1){
$fileName = mysql_result($query,0,0);
$fileType = mysql_result($query,0,1);
$fileSize = mysql_result($query,0,2);
$fileContents = mysql_result($query,0,3);
header("Content-type: $fileType");
header("Content-length: $fileSize");
header("Content-Disposition: inline; filename=$fileName");
header("Content-Description: from imagebank");
header("Connection: close");
echo $fileContents;
}else{
$numRows = mysql_num_rows($query);
echo "File not found <br>";
echo $numRows;
echo " is the number of rows returned for id = ";
echo $ID;
?>
Hope that helps
Phil

Apex 4.0 display image item :BLOB column returned by SQL statement

Hello
I'm creating an display image item in apex 4.0. The source is a BLOB column returned by SQL statement.
When I'm issuing an sql statement like this:
   select lado.blob_content
   from   large_documents      lado
   ,        large_doc_headers    ladh
   where lado.ladh_nr = ladh.nr
   more criteriait works fine.
When I create a function inside a package with the same query (in a cursor)
function get_image(some parameters in) return blob
Following in apex by:
select get_image(some parameters) from dualI get a
ORA-06502: PL/SQL: numeric or value error: character string buffer too smallAnybody any idea why this does not work?
Regards Erik

Hi Eric,
the environment assumes varchar2-output by default, which will be limited to 32767 characters and may have problems with binary formats. You could define a blob-variable to select the value into.
DECLARE
l_blob BLOB;
BEGIN
SELECT get_image(some parameters)
    INTO l_blob
    FROM dual;
END;
/If you expect the BLOB-Content to be text (you should consider CLOB then), you may use UTL_RAW.CAST_TO_VARCHAR2 to convert the content. If your object is larger than the maximum varchar2 size, or you want to convert BLOB to CLOB, you might be interested in some converter like described here: {message:id=559749}
Hope this is what you were searching for.
-Udo

Size of a displayed image in memory

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