Hi all I wonder if anyone can help me. I am writing a program which interfaces with a scanner. I would like to have a secondary window which displays the images as they are scanned. I am using the control p5 library, specifically, the pApplet as a secondary window. the trouble I'm having is that the pApplet stuff is setup right before Void Setup. That's all very well, but I have asked "theApplet" to load up an image using variables which are yet to be established. for example the file name and file extension are given by a textfield. Is there a simpler method of going about what I am trying to achieve or can I pull it off this way?

2. // controlWindowCanvas class
3. class MyCanvas extends ControlWindowCanvas {
4. public PImage P;
5. public MyCanvas() {
6. P = loadImage("C:/Users/arthur prior/Desktop/OUTPUT/" +MARGINmyTextfield.getText()  + "." + FILETYPE.captionLabel());
7. }
8. public void draw(PApplet theApplet) {
9. theApplet.image(P,0,0);
10. }
11. }
12. 
    

I'll also post the whole code so you can see what's going on elsehwhere...

2. import processing.opengl.*;
3. 
   
4. import javax.imageio.ImageIO;
5. import java.awt.Toolkit;
6. import java.awt.image.BufferedImage;
7. 
   
8. import processing.serial.*;
9. import controlP5.*;
10. ControlP5 controlP5;
11. Serial port;
12. Textfield MARGINmyTextfield;
13. ListBox RESOLUTION;
14. ListBox FILETYPE;
15. ControlWindow controlWindow;
16. ControlWindowCanvas cc;
17. 
    
18. // controlWindowCanvas class
19. class MyCanvas extends ControlWindowCanvas {
20. public PImage P;
21. public MyCanvas() {
22. P = loadImage("C:/Users/arthur prior/Desktop/OUTPUT/" +MARGINmyTextfield.getText()  + "." + FILETYPE.captionLabel());
23. }
24. public void draw(PApplet theApplet) {
25. theApplet.image(P,0,0);
26. }
27. }
28. 
    
29. void setup() {
30. size(420, 594);  
31. 
    
32. 
    
33. frame.setLocation(0,0); // set to the position of the second display
34. 
    
35. controlP5 = new ControlP5(this); // initialize the GUI controls
36. 
    
37. println("Available serial ports:");
38. println(Serial.list());
39. 
    
40. port = new Serial(this, "COM8", 9600); 
41. 
    
42. MARGINmyTextfield = controlP5.addTextfield ("MARGIN",100,100,125,15); // addTextfield(name,x,y,width,height)
43. MARGINmyTextfield.setAutoClear (false);
44. MARGINmyTextfield.keepFocus (true); 
45. 
    
46. controlWindow = controlP5.addControlWindow("controlP5window",100,100,420, 594,30);
47. controlWindow.setUpdateMode(ControlWindow.NORMAL);
48. cc = new MyCanvas();
49. cc.pre();
50. controlWindow.addCanvas(cc);
51. 
    
52. controlP5.addButton       ("UPPE",     1,165,180,40,16); // buton(name,value,x,y,width,height)
53. controlP5.addButton       ("DOUNE",    1,165,220,40,16); // buton(name,value,x,y,width,height)
54. controlP5.addButton       ("RIHTE",    1,230,200,40,16); // buton(name,value,x,y,width,height)
55. controlP5.addButton       ("LIBBE",    1,100,200,40,16); // buton(name,value,x,y,width,height)
56. controlP5.addButton       ("RTN",      1,100,300,40,16); // buton(name,value,x,y,width,height)
57. controlP5.addButton       ("SCAN",     1,230,300,40,16); // buton(name,value,x,y,width,height)
58. controlP5.addButton       ("CLEAR",    1,230,100,40,16); // buton(name,value,x,y,width,height)
59.   
60. RESOLUTION = controlP5.addListBox("RESOLUTION",100,425,80,75);
61. RESOLUTION.setItemHeight(15);
62. RESOLUTION.setBarHeight(15); 
63. RESOLUTION.actAsPulldownMenu(true);
64. 
    
65. RESOLUTION.captionLabel().set("RESOLUTION (DPI)");
66. RESOLUTION.captionLabel().style().marginTop = 3;
67. RESOLUTION.valueLabel().style().marginTop = 3; // the +/- sign
68. 
    
69.   RESOLUTION.addItem("72", 72);
70.   RESOLUTION.addItem("150",150);
71.   RESOLUTION.addItem("240",240);
72.   RESOLUTION.addItem("300",300);
73.   RESOLUTION.addItem("360",360);
74.   RESOLUTION.addItem("400",400);
75.   RESOLUTION.addItem("600", 600);
76.   RESOLUTION.addItem("720",720);
77.   RESOLUTION.addItem("800",800);
78.   RESOLUTION.addItem("1200",1200);
79.   RESOLUTION.addItem("2400",2400);
80.   RESOLUTION.addItem("3200",3200);
81.   RESOLUTION.addItem("4800",4800);
82.   RESOLUTION.addItem("6400",6400);
83.   RESOLUTION.addItem("9600",9600);
84.   RESOLUTION.addItem("12800",12800);
85. 
    
86. RESOLUTION.setColorBackground(color(255,128));
87. RESOLUTION.setColorActive(color(0,0,255,128));
88. 
    
89. //////////////////////////////////////////////
90. 
    
91. FILETYPE = controlP5.addListBox("FILETYPE",192,425,80,120);
92. FILETYPE.setItemHeight(15);
93. FILETYPE.setBarHeight(15); 
94. FILETYPE.actAsPulldownMenu(true);
95. 
    
96. FILETYPE.captionLabel().set("FILE TYPE");
97. FILETYPE.captionLabel().style().marginTop = 3;
98. FILETYPE.valueLabel().style().marginTop = 3; // the +/- sign
99. 
    
100.   FILETYPE.addItem("jpg",1);
101.   FILETYPE.addItem("tiff",2);
102.   FILETYPE.addItem("png",3);
103.   FILETYPE.addItem("bmp",4);
104. 
     
105. FILETYPE.setColorBackground(color(255,128));
106. FILETYPE.setColorActive(color(0,0,255,128));
107. 
     
108. }
109.   void draw() {
110. }
111.   void controlEvent(ControlEvent theEvent) {
112.   println(theEvent.controller().name());
113. }
114.   void UPPE(int theValue){
115.   port.write('<'+"U"+MARGINmyTextfield.getText()+'>');
116.   println("sent"+"U"+MARGINmyTextfield.getText()+'>');
117. }
118.   void DOUNE(int theValue) {
119.   port.write('<'+"D"+MARGINmyTextfield.getText()+'>');
120.   println("sent"+"D"+MARGINmyTextfield.getText());
121. }
122.   void RIHTE(int theValue) {
123.   port.write('<'+"R"+MARGINmyTextfield.getText()+'>');
124.   println("sent"+"R"+MARGINmyTextfield.getText());
125. }
126.   void LIBBE(int theValue) {
127.   port.write('<'+"L"+MARGINmyTextfield.getText()+'>');
128.   println("sent"+"L"+MARGINmyTextfield.getText());
129. }
130.   void RTN(int theValue) {
131.   port.write('<'+"H"+MARGINmyTextfield.getText()+'>');
132.   println("sent"+"H"+MARGINmyTextfield.getText());
133. }
134.   void CLEAR(int theValue) {
135.   MARGINmyTextfield.clear();
136.   println("sent CLEAR"); // print it to the debug screen as well
137. }
138. 
     
139. void SCAN() {
140.     
141. try {
142.     TwainSource source = TwainManager.getDefaultSource();
143.     source.setVisible(false);
144.     double resolution = Double.parseDouble(RESOLUTION.stringValue());
145.     System.err.println("PARSE RESOLUTION : "+resolution);
146.     source.setResolution(resolution);
147.     System.err.println("RESOLUTION DPI : "+source.getResolution());
148.     
149.     MorenaImage morenaImage = new MorenaImage(source); 
150.     Image image=Toolkit.getDefaultToolkit().createImage(morenaImage); 
151.     BufferedImage bimg=new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB);
152.     bimg.createGraphics().drawImage(image, 0, 0, null);
153.     ImageIO.write(bimg, "jpg" , new File ("C:/Users/arthur prior/Desktop/OUTPUT/" +MARGINmyTextfield.getText()  + "." + FILETYPE.captionLabel()));
154.     
155. } catch (Exception ex) {
156. }
157. }
158. 
     
159.   void serialEvent(Serial aPort){
160.   String myString = aPort.readStringUntil('\n');
161.   if (myString != null){
162.   myString = trim(myString);
163.   println(myString);
164.   }
165. }
166. 
     
167. 
     
168. 
     
169. 
     
170. 
     
171. 
     
172. 
     

The error message I get is as follows:

Thankyou for your time! Best, Arthur