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file input problems (with windows?)

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Join Date: Apr 2007
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Zatnik Zatnik is offline Offline
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file input problems (with windows?)

 
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  #1
Apr 2nd, 2007
I've finished my assignment (messily) and it works well enough in the uni linux computers - but I can't make file input work at home under XP. I wouldn't have thought that the windows/linux change would make a difference with the JRE...

(But then I'm new to this "com-puuuu-tah" stuff)

the directory contains:
ClassID.class & .java
ClassRecord.class & .java
RunRecord.class & .java
rec

rec is the file I'm trying to load.

IOException returned is:
(The filename, directory name, or volume label syntax is incorrect)

The section of code that deals with file io is here:

java Syntax (Toggle Plain Text) 
  1. public ClassRecord(String filename) 
  2. //load from file 
  3. { 
  4. FileInputStream fis; 
  5. InputStreamReader isr; 
  6. ...
  7. try { 
  8.  fis = new FileInputStream(filename); 
  9.  isr = new InputStreamReader(fis); 
  10.  ...
  11.   } 
  12.  } 
  13. catch( IOException e) 
  14.  { 
  15.  System.out.println("LOADING ERROR! " + filename + "\n" + e); 
  16.  } 
  17. }

The complete code is below:
(If anybody needs to know what the task actually was I can put that in, but I don't think it's nessisary. Nor really is the complete code... but just in case.)

ClassID
java Syntax (Toggle Plain Text) 
  1. import java.io.*; 
  2. import java.util.*; 
  3.  
  4. public class ClassID 
  5. { 
  6. /*feilds*/ 
  7. private String strName; 
  8. private int intID; 
  9. private int intACN; 
  10. private double dblTTim; //military H.MM 
  11. private int intTMod; 
  12. /*defaults*/ 
  13. public String dftName = new String("[UNNAMED!]"); 
  14. public int dftID = 0; 
  15. public int dftACN = 0; 
  16. public double dftTTim = 0.00; 
  17. public int dftTMod = 0; 
  18.  
  19. /*CONSTRUCTORS*/ 
  20. public ClassID() 
  21. { 
  22. strName = new String(dftName); 
  23. intID = dftID; 
  24. intACN = dftACN; 
  25. dblTTim = dftTTim; 
  26. intTMod = dftTMod; 
  27. } 
  28. public ClassID(String inName, int inID, int inACN, double inTTim, int 
  29. inTMod) 
  30. //Alternate 
  31. { 
  32. strName = new String(inName); 
  33. intID = inID; 
  34. intACN = inACN; 
  35. dblTTim = inTTim; 
  36. intTMod = inTMod; 
  37. } 
  38. public ClassID(String inString) 
  39. //Alternate2 - 1 
  40. { 
  41. StringTokenizer sttTokStr; 
  42. sttTokStr = new StringTokenizer(inString); 
  43. if (sttTokStr.hasMoreTokens()) 
  44. strName = new String(sttTokStr.nextToken()); 
  45. else strName = new String(dftName); 
  46. if (sttTokStr.hasMoreTokens()) 
  47. intID = Integer.parseInt( sttTokStr.nextToken()); 
  48. else intID = dftID; 
  49. if (sttTokStr.hasMoreTokens()) 
  50. intACN = Integer.parseInt( sttTokStr.nextToken()); 
  51. else intACN = dftACN; 
  52. if (sttTokStr.hasMoreTokens()) 
  53. dblTTim = Double.parseDouble( sttTokStr.nextToken()); 
  54. else dblTTim = dftTTim; 
  55. if (sttTokStr.hasMoreTokens()) 
  56. intTMod = Integer.parseInt( sttTokStr.nextToken()); 
  57. else intTMod = dftTMod; 
  58.  
  59. System.out.println(toString()); 
  60. } 
  61. public ClassID(ClassID inID) 
  62. //Alternate2 - 2 COPY 
  63. { 
  64. strName = new String(inID.getName()); 
  65. intID = inID.getID(); 
  66. intACN = inID.getACN(); 
  67. dblTTim = inID.getTTim(); 
  68. intTMod = inID.getTMod(); 
  69. } 
  70. /*MUTATORS*/ 
  71. //currently no validation. 
  72. public void setName(String inName) 
  73. { 
  74. strName = inName; 
  75. } 
  76. public void setID(int inID) 
  77. { 
  78. intID = inID; 
  79. } 
  80. public void setACN(int inACN) 
  81. { 
  82. intACN = inACN; 
  83. } 
  84. public void setTTim(double inTTim) 
  85. { 
  86. dblTTim = inTTim; 
  87. } 
  88. public void setTMod(int inTMod) 
  89. { 
  90. intTMod = inTMod; 
  91. } 
  92.  
  93. /*ACCESSORS*/ 
  94. public String getName() 
  95. { 
  96. return new String(strName); 
  97. } 
  98. public int getID() 
  99. { 
  100. return intID; 
  101. } 
  102. public int getACN() 
  103. { 
  104. return intACN; 
  105. } 
  106. public double getTTim() 
  107. { 
  108. return dblTTim; 
  109. } 
  110. public int getTMod() 
  111. { 
  112. return intTMod; 
  113. } 
  114. public String toString() 
  115. /*Format: (space seperated.) 
  116. strName intID intACN dblTTim intTMod*/ 
  117. { 
  118. String strTMod = new String("No mode specified"); 
  119. if( intTMod == 0) 
  120. strTMod = "ENTRY"; 
  121. else if( intTMod == 1) 
  122. strTMod = "EXIT"; 
  123. return new String(strName + " " + intID + " " + intACN + " " +dblTTim + " " 
  124. + strTMod); 
  125. } 
  126. public String saveString() 
  127. { 
  128. return new String(strName + " " + intID + " " + intACN + " " +dblTTim + " " 
  129. + intTMod + ":"); 
  130. } 
  131. public boolean equals(ClassID id2) 
  132. //compares id number and name. 
  133. //case sensitive 
  134. { 
  135. boolean sfgrdgkj = false; 
  136. if( strName.equals(id2.getName()) && intID == id2.getID()) 
  137. sfgrdgkj = true; 
  138. return sfgrdgkj; 
  139. } 
  140. }

ClassRecord
java Syntax (Toggle Plain Text) 
  1. import java.io.*; 
  2. import java.util.*; 
  3. public class ClassRecord 
  4. /* 
  5. +constructors... 
  6. ... 
  7. +toString 
  8. +save 
  9. +add 
  10. +getLength 
  11. +getCidValue 
  12. +findByID 
  13. +findByName 
  14. */ 
  15. { 
  16. private ClassID cid[]; 
  17.  
  18. public ClassRecord(String filename) 
  19. //load from file 
  20. { 
  21. FileInputStream fis; 
  22. InputStreamReader isr; 
  23. int data; 
  24. String str = new String(); 
  25. try { 
  26. fis = new FileInputStream(filename); 
  27. isr = new InputStreamReader(fis); 
  28. data = isr.read(); 
  29. double dblN = 0.0; 
  30. double d = 0.1; 
  31. int n = 0; 
  32. while( data != (int)':') 
  33. { 
  34. dblN += d*(double)(data - 48); //48 is 0 code. 
  35. data = isr.read(); 
  36. d = d/10.0; 
  37. } 
  38. n = (int)(dblN/(d*10.0)); 
  39. System.out.println("number of entries= " + n); 
  40. cid = new ClassID [n]; 
  41. data = isr.read(); //skip the : 
  42. data = isr.read(); 
  43. int i = 0; 
  44. while(i<n) 
  45. { 
  46. while( data != -1 && data != (int)':') 
  47. { 
  48. str += (char)data; 
  49. data = isr.read(); 
  50. } 
  51. cid[i] = new ClassID(str); 
  52. data = isr.read(); //skip : 
  53. data = isr.read(); 
  54. str = ""; 
  55. i++; 
  56. } 
  57. } 
  58. catch( IOException e) 
  59. { 
  60. System.out.println("LOADING ERROR! " + filename + "\n" + e); 
  61. } 
  62. } 
  63. public ClassRecord(ClassRecord inRec) 
  64. { 
  65. cid = new ClassID[inRec.getLength()]; 
  66. for( int i=0; i<inRec.getLength(); i++) 
  67. cid[i] = new ClassID(inRec.getCidValue(i)); 
  68. } 
  69. public ClassRecord(int n) 
  70. //constructs an array of size n default elements 
  71. { 
  72. cid = new ClassID[n]; 
  73. for( int i=0; i<n; i++) 
  74. cid[i] = new ClassID(); 
  75. } 
  76. public void save(String filename) 
  77. //write to file 
  78. { 
  79. FileOutputStream fos; 
  80. PrintWriter pw; 
  81. try { 
  82. System.out.println("SAVING... " + filename); 
  83. fos = new FileOutputStream(filename); 
  84. pw = new PrintWriter(fos, true); 
  85. pw.println(cid.length + ":"); 
  86. for( int i = 0; i< cid.length; i++) 
  87. pw.println(cid[i].saveString()); 
  88. pw.close(); 
  89. System.out.println("DONE SAVING!"); 
  90. } 
  91. catch (IOException e) 
  92. { 
  93. System.out.println("WRITE ERROR! " + filename); 
  94. } 
  95. } 
  96. public void add(ClassID inID) 
  97. //add one elment on end 
  98. { 
  99. int m = cid.length; 
  100. int n = m+1; 
  101. ClassID cid2[]; 
  102. cid2 = new ClassID[m]; 
  103. for( int i=0; i<m;i++) 
  104. cid2[i] = new ClassID(cid[i]); 
  105. cid = new ClassID [n]; 
  106. for( int i=0; i<m; i++) 
  107. { 
  108. cid[i] = new ClassID(cid2[i]); 
  109. } 
  110. cid[m] = new ClassID(inID); 
  111. } 
  112. public void findByName(String search) 
  113. { 
  114. System.out.println("SEARCHING for: " + search + 
  115. "\n#.| Name | ID | ACN | time(military) | mode"); 
  116. int resultCount = 0; 
  117. for( int i=0; i< cid.length; i++) 
  118. { 
  119. if ((cid[i].getName()).equals(search)) 
  120. { 
  121. resultCount++; 
  122. System.out.println(i + ". " + cid[i].toString()); 
  123. } 
  124. } 
  125. System.out.println("The Search is COMPLETE.\n" + 
  126. resultCount + " result(s) found matching your request."); 
  127. } 
  128. public void findByID(int search) 
  129. { 
  130. System.out.println("SEARCHING for: " + search); 
  131. int resultCount = 0; 
  132. for( int i=0; i< cid.length; i++) 
  133. { 
  134. if (cid[i].getID() == search) 
  135. { 
  136. resultCount++; 
  137. System.out.println(i + ". " + cid[i].toString()); 
  138. } 
  139. } 
  140. System.out.println("The Search is COMPLETE.\n" + 
  141. resultCount + " result(s) found matching your request."); 
  142. } 
  143. public int getLength() 
  144. { 
  145. return cid.length; 
  146. } 
  147. public ClassID getCidValue(int i) 
  148. { 
  149. return new ClassID(cid[i]); 
  150. } 
  151. public String toString() 
  152. //for displaying results only 
  153. { 
  154. String outString = new String(""); 
  155. int n = cid.length; 
  156. for( int i=0; i<n; i++) 
  157. outString += (i+1) + ". " + cid[i].toString() + "\n"; 
  158. return outString; 
  159. } 
  160. public int getNumPpl() 
  161. //finds number of different people in the current array 
  162. //uses ClassID equals() 
  163. { 
  164. /* 
  165. ppl = 1 
  166. FOR c = 1 to n-1 
  167. if beenBefore(c) returns false 
  168. then increment ppl 
  169. END FOR 
  170. */ 
  171. int n = cid.length; 
  172. int i = 0; 
  173. int ppl = 1; //num people so far, including 0th element. 
  174. for( int c=1; c<n; c++) 
  175. { 
  176. if(beenBefore(c) == false) 
  177. ppl++; //ie, if there have been none the same so far, 
  178. //then increment ppl. 
  179. } 
  180. return ppl; 
  181. } 
  182. public boolean beenBefore(int c) 
  183. //has this person been in a previous ClassID? 
  184. { 
  185. boolean equ = false; 
  186. int n = cid.length; 
  187. int i = 0; 
  188. i = 0; 
  189. while((i<c) && (equ == false)) 
  190. { 
  191. if( cid[i].equals(cid[c])) 
  192. equ = true; 
  193. i++; 
  194. } 
  195. return equ; 
  196. } 
  197. public void groupID() 
  198. { 
  199. save("rtemp"); 
  200. ClassRecord rtemp = new ClassRecord("rtemp"); 
  201. int ct = 0; 
  202. int it = 0; 
  203. int cc = 0; 
  204. int ic = 0; 
  205. while(ct<cid.length) 
  206. { 
  207. if(rtemp.beenBefore(ct) == false) 
  208. { 
  209. cid[cc] = new ClassID(rtemp.getCidValue(ct)); cc++; 
  210. for(it=ct+1;it<cid.length;it++) 
  211. { 
  212. if((rtemp.getCidValue(it)).equals(cid[(cc-1)])) 
  213. { 
  214. cid[cc] = new ClassID(rtemp.getCidValue(it)); cc++; 
  215. } 
  216. } 
  217. } 
  218. ct++; 
  219. } 
  220.  
  221. /* 
  222. WHILE ct<n 
  223. IF t(ct) beenbefore = false 
  224. THEN 
  225. c(cc) = t(ct) 
  226. cc++ 
  227. FOR (ct<it<n) 
  228. IF t(it) = c(ct-1) 
  229. THEN 
  230. c(cc) = t(it) 
  231. cc++ 
  232. END IF 
  233. END FOR 
  234. END IF 
  235. ct++ 
  236. END WHILE 
  237.  
  238. Run Example: 
  239. FROM: 
  240. Alexander 1 1 6.0 ENTRY 
  241. Birchcoff 2 1 7.0 ENTRY 
  242. Cronowijk 3 2 7.01 ENTRY 
  243. Dawson 4 3 7.23 ENTRY 
  244. Eden 5 2 8.3 ENTRY 
  245. Cronowijk 3 2 8.31 EXIT 
  246. Alexander 1 1 9.0 EXIT 
  247. Birchcoff 2 1 9.1 EXIT 
  248. Dawson 4 3 9.11 EXIT 
  249. Eden 5 2 9.12 EXIT 
  250.  
  251.  
  252. TO: 
  253. 1. Alexander 1 1 6.0 ENTRY 
  254. 2. Alexander 1 1 9.0 EXIT 
  255. 3. Birchcoff 2 1 7.0 ENTRY 
  256. 4. Birchcoff 2 1 9.1 EXIT 
  257. 5. Cronowijk 3 2 7.01 ENTRY 
  258. 6. Cronowijk 3 2 8.31 EXIT 
  259. 7. Dawson 4 3 7.23 ENTRY 
  260. 8. Dawson 4 3 9.11 EXIT 
  261. 9. Eden 5 2 8.3 ENTRY 
  262. 10. Eden 5 2 9.12 EXIT 
  263.  
  264.  
  265. */ 
  266. } 
  267. public void viewDurations() 
  268. { 
  269. int imin, imax; 
  270. groupID(); 
  271. int c = 0; 
  272. int k = 0; 
  273. String strDur[]; 
  274. strDur = new String[getNumPpl()]; 
  275. while( c<cid.length) 
  276. { 
  277. imin = c; 
  278. //while the next element has the same person as this one 
  279. if( c+1<cid.length) 
  280. if( cid[c+1].equals(cid[c])) 
  281. c++; 
  282. imax = c; 
  283. strDur[k] = new String(calcTotalTime(imin, imax) + ": " + 
  284. cid[c].getID() + " " + cid[c].getName()); 
  285. k++; c++; 
  286. } 
  287. //SORT BY THE durations - not coded 
  288. System.out.println("_______________________________" + 
  289. "\nduration | ID | Name\n"+ 
  290. "[-ve duration: worker did not leave]"); 
  291. for(k=0;k<getNumPpl();k++) 
  292. System.out.println(strDur[k]); 
  293. /* 
  294. sort, if things are same, calcTotalTime(imin, imax), 
  295. stick stuff in an array of strings or make some other object, 
  296. then sort them into the correct order. 
  297. */ 
  298. } 
  299. private double calcTotalTime(int imin, int imax) 
  300. { 
  301. /* 
  302. IMPORTS: - 
  303. EXPORTS: total (a double) 
  304. double total = 0.0 
  305. FOR (imin <= i <= imax) 
  306. IF cid[i].getTMod() = 0 
  307. THEN total = total - cid[i].getTTim() 
  308. ELSE total += cid[i].getTTim() 
  309. END FOR 
  310. */ 
  311. int hours = 0; 
  312. int mins = 0; 
  313. int t = 0; 
  314. for( int i = imin; i<=imax; i++) 
  315. { 
  316. t = (int)(100.00*cid[i].getTTim()); 
  317. System.out.println(cid[i].getTTim()); 
  318. if(cid[i].getTMod() == 0) 
  319. { 
  320. hours = hours - t/100; 
  321. mins = mins - (t%100); 
  322. } 
  323. else 
  324. { 
  325. hours += t/100; 
  326. mins += t%100; 
  327. } 
  328. } 
  329. hours += mins/60; //note: integer division. 
  330. mins = mins - 60*(mins/60); // note: integer division. 
  331. if( mins<0) 
  332. { 
  333. mins = mins+60; 
  334. hours = hours -1; 
  335. } 
  336. return ((double)hours + ((double)(mins))/100.0); 
  337. /* 
  338. ASSERTION - data is valid. 
  339. Valid data: 
  340. is in pairs of 01! starts on 0, ends with 1, 
  341. 0 never follows 0 and 1 never follows 0, 
  342. and only 0 and 1 are present. 
  343.  
  344. Run Example: 
  345. from: 
  346. Name/ID/ACN/Time(H.MM)/mode 
  347. 1. Alexander 1 1 6.0 ENTRY 
  348. 2. Alexander 1 1 9.0 EXIT 
  349. 3. Birchcoff 2 1 7.0 ENTRY 
  350. 4. Birchcoff 2 1 9.1 EXIT 
  351. 5. Cronowijk 3 2 7.01 ENTRY 
  352. 6. Cronowijk 3 2 8.31 EXIT 
  353. 7. Dawson 4 3 7.23 ENTRY 
  354. 8. Dawson 4 3 9.11 EXIT 
  355. 9. Eden 5 2 8.3 ENTRY 
  356. 10. Eden 5 2 9.12 EXIT 
  357. 11. Henderson 6 3 0.1 ENTRY 
  358. 12. Henderson 6 4 1.0 EXIT 
  359. 13. Joans 7 5 9.0 ENTRY 
  360. 14. Mapel 8 3 9.0 ENTRY 
  361. 15. Mapel 8 3 9.01 EXIT 
  362. 16. Jhonston 9 2 6.0 ENTRY 
  363. to: 
  364. duration | ID | Name 
  365. [-ve duration: worker did not leave] 
  366. 3.0: 1 Alexander 
  367. 2.1: 2 Birchcoff 
  368. 1.3: 3 Cronowijk 
  369. 1.48: 4 Dawson 
  370. 0.41: 5 Eden 
  371. 0.5: 6 Henderson 
  372. -9.0: 7 Joans 
  373. 0.01: 8 Mapel 
  374. -6.0: 9 Jhonston 
  375. */ 
  376. } 
  377. }

RunRecord
java Syntax (Toggle Plain Text) 
  1. import io.*; 
  2. import java.io.*; 
  3.  
  4. public class RunRecord 
  5. { 
  6. public static void main( String []args) 
  7. { 
  8. String filename = new String(ConsoleInput.readLine( 
  9. "Please Enter filename to load/prep\n" + 
  10. "[a non-existant file will go to main menu]")); 
  11. ClassRecord rec = new ClassRecord(filename); 
  12.  
  13. boolean timeToBuggerOff = false; 
  14. do { 
  15. System.out.println("_______________________________" + 
  16. "\nSECURITY RECORD - MAIN MENU\n" + 
  17. "Apparent file: " + filename + "\n" + 
  18. "1 - LOAD a new file\n" + 
  19. "2 - SAVE changes OVER " + filename + "\n" + 
  20. "3 - SAVE AS\n" + 
  21. "4 - ADD a new entry\n" + 
  22. "5 - SEARCH for an entry\n" + 
  23. "6 - VEIW current file\n" + 
  24. "7 - VEIW sign in durations\n" + "8 - QUIT"); 
  25. int choice = ConsoleInput.readInt( 
  26. "Please enter your selection and press ENTER"); 
  27. if (choice == 1) 
  28. { 
  29. filename = ConsoleInput.readLine( 
  30. "Please Enter filename"); 
  31. rec = new ClassRecord(filename); 
  32. } 
  33. else if (choice == 2) 
  34. rec.save(filename); 
  35. else if (choice == 3) 
  36. { 
  37. filename = ConsoleInput.readLine( 
  38. "Please Enter filename"); 
  39. rec.save(filename); 
  40. } 
  41. else if (choice == 4) 
  42. { 
  43. System.out.println("NEW ENTRY:"); 
  44. rec.add(new ClassID(ConsoleInput.readLine("Name") + 
  45. " " + ConsoleInput.readLine("ID") + 
  46. " " + ConsoleInput.readLine("Access Control Number (ACN)") + 
  47. " " + ConsoleInput.readLine("time (in the form HH.MM, otherwise [Deleted For Security Reasons] you do wrong.)") + 
  48. " " + ConsoleInput.readLine("Mode:\n0.Entry\n1.Exit\n (enter number only. See above.)"))); 
  49. } 
  50. else if (choice == 5) 
  51. { 
  52. int choice2 = ConsoleInput.readInt( 
  53. "Search by:\n1.Name\n2.ID number\nENTER NUMBER ONLY"); 
  54. if (choice2 == 1) 
  55. rec.findByName(ConsoleInput.readLine("Enter Name")); 
  56. else 
  57. rec.findByID(ConsoleInput.readInt("Enter ID")); 
  58. } 
  59. else if (choice == 6) 
  60. { 
  61. System.out.println("_______________________________\n" + 
  62. "Name/ID/ACN/Time(H.MM)/mode\n" + rec.toString()); 
  63. } 
  64. else if (choice == 8) 
  65. timeToBuggerOff = true; 
  66. else if (choice == 7) 
  67. { 
  68. rec.viewDurations(); 
  69. } 
  70. else 
  71. System.out.println("Invalid entry."); 
  72. } 
  73. while (timeToBuggerOff == false); 
  74. } 
  75. }

rec
16:
Alexander 1 1 6.0 0:
Birchcoff 2 1 7.0 0:
Henderson 6 3 0.1 0:
Mapel 8 3 9.01 1:
Jhonston 9 2 6.0 0:
Cronowijk 3 2 8.31 1:
Eden 5 2 9.12 1:
Dawson 4 3 9.11 1:
Eden 5 2 8.3 0:
Alexander 1 1 9.0 1:
Henderson 6 4 1.0 1:
Joans 7 5 9.90 0:
Dawson 4 3 7.23 0:
Birchcoff 2 1 9.1 1:
Cronowijk 3 2 7.01 0:
Mapel 8 3 9.0 0:
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Re: file input problems (with windows?)

 
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  #2
Apr 2nd, 2007
Error you get is: "IOException returned is:
(The filename, directory name, or volume label syntax is incorrect)"
Did you check if you're giving the path correctly? May be it's some simple bug like using "/" instead of "\" (/ is for Linux/Unix and \ for windows as you know)
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Re: file input problems (with windows?)

 
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  #3
Apr 2nd, 2007
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Originally Posted by thekashyap View Post
Error you get is: "IOException returned is:
(The filename, directory name, or volume label syntax is incorrect)"
Did you check if you're giving the path correctly? May be it's some simple bug like using "/" instead of "\" (/ is for Linux/Unix and \ for windows as you know)
Just as a note. You can use "/" in Java on both Windows and all Unix flavors (I haven't got a Mac to try, but I'm fairly sure you can use it there, too). So, for convenience sake (and efficiency sake, since it will eliminate errors such as using a single, instead of a double, "\") it is better to either always use "/", or, if you don't like this, to always use File.separator
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
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Re: file input problems (with windows?)

 
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  #4
Apr 3rd, 2007
@masijade:
Interesting..
Checked and it works as well..

@Zatnik
Can you please post the full stack trace that you got.. ?
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Re: file input problems (with windows?)

 
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  #5
Apr 3rd, 2007
stack trace? Unfortunatly I'm new to this, so I don't actually know what that is. (and "a printout of the calling stack with the current routine at the top of the trace, showing the name of any violated assertions," doesn't mean much to me. Sorry.)

With the linix computers I didn't need to use a path - just "rec" worked, I'm guessing since "rec" is in the directory I'm running my program from - I find I can load rec if I recompile with the path inside the program itself,
java Syntax (Toggle Plain Text) 
  1. //fis = new FileInputStream(filename); 
  2. fis = new FileInputStream("C:\\Documents and Settings\\Step\\My Documents\\Curtin\\2007-Sem1\\ST152\\W01\\rec");
but that rather defies the point of trying to load and save different files by typing them into the command line. I suppose I could always put ("C:\\Documents and Settings\\Step\\My Documents\\Curtin\\2007-Sem1\\ST152\\W01\\" + filename), but then (if I made something similar and wanted to use it on different computers) I'de have to recompile it with whatever path every single tmie.

But possibly I'm working towards my own solution: is there something I can put into the code that will just mean "this current directory here"?
Also, how would I got about typing the path into the command line.

Oh, on testing, ("C:\\Documents and Settings\\Step\\My Documents\\Curtin\\2007-Sem1\\ST152\\W01\\" + filename) doesn't work, though ("C:\\Documents and Settings\\Step\\My Documents\\Curtin\\2007-Sem1\\ST152\\W01\\rec") does. I have no idea why.

(thanks for looknig at this.)
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Re: file input problems (with windows?)

 
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  #6
Apr 3rd, 2007
I will go out on a limb and say that the problem arises form the following:

Java Syntax (Toggle Plain Text) 
  1. filename = ConsoleInput.readLine( "Please Enter filename");
  2. rec.save(filename);

As I am fairly sure that you will be entering the filename as follows:
Java Syntax (Toggle Plain Text) 
  1. C:\Bogus\Path\To\File.txt

if this is the case you need to modify the above two lines as follows:
Java Syntax (Toggle Plain Text) 
  1. filename = ConsoleInput.readLine( "Please Enter filename");
  2. rec.save(filename.replaceAll("\\", "\\\\"));
  3. // or rec.save(filename.replaceAll("\\", "/"));

As otherwise, you are saving a String with single "\" characters in it, and so, when you attempt to open the file it will interpret the "\" and the character directly after it as special constructs, so you need to escape each of those single "\" characters with a double "\" character, but since "\" is a special character in the replace Strings, you need to escape it there as well, which is the reason for the double and then quadruple "\" characters in the replace statement. The double "\" will find all instances of a "\" and the quadruple "\" will place a double "\" in all those places.

I hope this makes sense to you, as I can't really explain it any better.
Last edited by masijade; Apr 3rd, 2007 at 6:51 am. Reason: I was posting this at the same time the OP was making his last post.
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--Brian Kernighan
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Re: file input problems (with windows?)

 
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  #7
Apr 4th, 2007
In other words:
You need to understand how the escape characters/sequences work in Java. When you prefix a character in a string with a '\' you are escaping it. When you escape a character it's meaning changes as masijade explained..
Finally abt the stack trace.. In your code replace:
java Syntax (Toggle Plain Text) 
  1. catch( IOException e)
  2. {
  3.     System.out.println("LOADING ERROR! " + filename + "\n" + e);
  4. }

with

java Syntax (Toggle Plain Text) 
  1. catch( IOException e)
  2. {
  3.     System.out.println("IOException caught. Stack trace is:");
  4.     e.printStackTrace();
  5. }

Now run your program with the wrong path and see what is printed on the screen. That's your stack trace.
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