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POC++ STATUS_ACCESS_VIOLATION error when program runs
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9796200
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9796365
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2
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2012-03-20T22:47:47.873
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2015-02-26T20:11:58.273
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2012-03-20T22:56:37.940
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Everytime I run the program, this mysterious error pops up saying that I have some type of status access violation. I have tried googling it and all it comes up with is that I might be trying to access some memory that is not allowed. Help would be highly appreciated! Here is the error when I run the program: <pre><code> 2 [main] a 5772 exception::handle: Exception: STATUS_ACCESS_VIOLATION 1532 [main] a 5772 open_stackdumpfile: Dumping stack trace to a.exe.stackdump </code></pre> Here is the .cpp code: <pre><code>int main() { Stack s; //variable declarations StackItem *newItem; char token, nextChar, prevChar, response, check; int lineCount, apostCount; char filename[50]; bool insideComment = false, insideString = false, error, isMatch, delimError = false; fstream sourceFile; do //do while response is 'y' { do //do while opening the source file fails { cout << "Enter filename of source file: "; cin.getline (filename,51); sourceFile.open(filename); //opens the file with given filename if (sourceFile.fail()) cout << "File could not be opened" << endl; //error if can't open sourceFile.clear(); } while (sourceFile.fail()); //exits if source file doesn't fail sourceFile.clear(); lineCount = 0; //initializes line count to zero while (!sourceFile.eof()) //exits if end of source file is reached { sourceFile.get(nextChar); //gets the next character in file if ((int)nextChar == '\n') //if next character is an end line { lineCount++; //increments line count cout << "Line count: " << lineCount << endl; //echoes line count } else if (nextChar == '{' || nextChar == '[' || nextChar == '(') { //continues if next char is an opening token newItem->token = nextChar; //sets newItem's token newItem->lineNumber = lineCount; //sets newItem's line count if (!s.isFull()) //continues if stack isn't full s.push(newItem); //pushes newItem onto the stack s.displayStack(); //displays the stack } else if (nextChar == '}' || nextChar == ']' || nextChar == ')') { //continues if next char is a closing token if (!s.isEmpty()) //continues if stack isn't empty { isMatch = s.matchStack(nextChar); //checks if token matches top if (isMatch == true) //if true, pops the top of the stack s.pop(); else //continues if match is false { newItem->token = nextChar; //sets newItem's token newItem->lineNumber = lineCount; //sets newITem's line count s.trailingItem(newItem); //calls the trailingItem function cout << endl << endl << "Process another file? (y/n): "; cin >> response; //asks user whether to continue while (response != 'y' && response != 'n') //checks for input error { cout << "Error! Must enter either y for yes or n for no." << endl; cout << endl << endl << "Process another file? (y/n): "; cin >> response; } break; //leaves the while loop } } else if (s.isEmpty()) //continues if stack is empty { newItem->token = nextChar; //sets newItem's token newItem->lineNumber = lineCount; //sets newItem's line count s.push(newItem); //pushes newItem onto the top of the stack s.processStack(); //processes the error cout << endl << endl << "Process another file? (y/n): "; cin >> response; //asks user whether to continue while (response != 'y' && response != 'n') //checks for input error { cout << "Error! Must enter either y for yes or n for no." << endl; cout << endl << endl << "Process another file? (y/n): "; cin >> response; //gets user input } break; //leaves the while loop } s.displayStack(); //displays the items on the stack } else if (nextChar == '/') //continues if next char is a '/' { sourceFile.get(nextChar); //gets the next character in file if (nextChar == '*') //continues if next char is a '*' { //at this point a comment has started because of '/' then '*' insideComment = true; //sets bool to true newItem->token = 'c'; //sets newItem's token to c for "comment" newItem->lineNumber = lineCount; //sets newItem's line count s.push(newItem); //pushes the item onto the stack while (insideComment == true && !sourceFile.eof()) { //continues while inside a comment and end of file isn't reached sourceFile.get(nextChar); //gets the next character in file if (nextChar == '*') //continues if next char is * { sourceFile.get(nextChar); //gets the next character in file if (nextChar == '/') //continues if next char is '/' { //at this point the comment has ended because of '*' then '/' insideComment = false; //sets bool to false s.pop(); //pops off the c in the stack } } } } else if (nextChar == '/') //continues if next char is a '/' { //at this point a comment has started because of / then another '/' insideComment = true; //sets bool to true while (insideComment == true && !sourceFile.eof()) { //continues while inside a comment and not at end of file sourceFile.get(nextChar); //gets the next character in file if (nextChar == '\n') //leaves comment if next line is entered insideComment = false; //sets bool to false } } } else if (nextChar == '\n') //continues if next char is an end line { lineCount++; //increments line count cout << "Line count: " << lineCount << endl; //echoes line count } else if (nextChar == '\"' && insideComment == false) { //continues if next char is a " and is not currently inside a comment insideString = true; //sets bool to true b/c " starts a string while (insideString == true && !sourceFile.eof()) { sourceFile.get(nextChar); //gets the next character in file if (nextChar == '\"') insideString = false; else if (nextChar == '\n') { lineCount++; //increments line count cout << "Line count: " << lineCount << endl; //echoes line count } } } else if (nextChar == '\'' && insideComment == false && insideString == false) { //continues if next char is a ' and not in a comment or string apostCount = 1; //initializes apostrophe count (chars after first apostrophe) while (nextChar != '\'' && !sourceFile.eof()) { //continues while next char isn't another ' and not end of file sourceFile.get(nextChar); //gets the next character in file prevChar = nextChar; apostCount++; //increments apostrophe count if (nextChar == '\'' && prevChar == '\\' && apostCount <= 3) nextChar = ' '; //sets next char to space if 3 or more apostrophes else if (nextChar == '\n') //continues if next char is an end line { lineCount++; //increments line count cout << "Line count: " << lineCount << endl; //echoes line count } } if (apostCount >= 4) //if more than 3 chars come after apostrophe { //displays delimeter error cout << "Character delimeter error on line " << lineCount << endl; delimError = true; } if (delimError == true) //continues if delimiter error occured break; //leaves 2nd while loop } } //end of while loop if (s.isEmpty() == true) //continues if no errors within stack { //displays successful nesting structure to user cout << "Source file of " << lineCount << " lines has proper nesting structure"; cout << endl << endl << "Process another file? (y/n): "; //asks to continue cin >> response; //gets user's response while (response != 'y' && response != 'n') //checks for input error { cout << "Error! Must enter either y for yes or n for no." << endl; cout << endl << endl << "Process another file? (y/n): "; cin >> response; //gets user input } } else //continues if errors are present { s.processStack(); //processes and displays the delimiter errors cout << endl << endl << "Process another file? (y/n): "; //asks to continue cin >> response; //gets user's response while (response != 'y' && response != 'n') //checks for input error { cout << "Error! Must enter either y for yes or n for no." << endl; cout << endl << endl << "Process another file? (y/n): "; cin >> response; //gets user input } } } while (response == 'y'); //opens another file if user entered y for yes return 0; //quits program } </code></pre> Here is the .h code: <pre><code>struct StackItem //defines StackItem structure { char token; //holds delimeter int lineNumber; //holds the line number of the delimeter in the source file StackItem *next; //points to the next structure }; typedef StackItem* nodePtr; const int MAX_ITEMS = 99; class Stack //Stack class definition { private: nodePtr top; //points to the top of the stack int numberItems; //number of items in the stack public: Stack() //initializes private variables { top = NULL; numberItems = 0; } ~Stack() { while (numberItems > 0) { pop(); } } bool isEmpty() //returns whether the stack is empty or not { return top == NULL; } bool isFull() //returns whether the stack is full or not { return MAX_ITEMS == numberItems;} void push(nodePtr newItem) //pushes a new item onto the top of the stack { newItem->next = top; top = newItem; numberItems++; } void pop() //removes the item on top of the stack { nodePtr p = top; //sets pointer p to what top points to top = top->next; //top is set to the next struct in stack delete p; //deletes the top item in the stack numberItems--; } void displayStack() //displays all of the items on the stack { nodePtr p = top; //sets pointer p to what top points to cout << "Stack Contents: " << endl; while(p != NULL) //while loop to display the stack contents { cout << p->token << " on line " << p->lineNumber << "." << endl; p = p->next; } } void processStack() //displays the error for each delimeter in stack { nodePtr p = top; //sets pointer p to what top points to while (p != NULL) //continues until p points to NULL { cout << "\" " << p->token << " \" on line " << setw(5) << right; cout << p->lineNumber << " has no matching element" << endl; p = p->next; } } //determines whether the stack delimeter matches the current character bool matchStack(char character) { bool match = false; if (top->token == '{') { if (character == '}') match = true; //sets bool to true if we have { and } } else if (top->token == '[') { if (character == ']') match = true; //sets bool to true if we have [ and ] } else if (top->token == '(') { if (character == ')') match = true; //sets bool to true if we have ( and ) } return match; //returns the bool } //called if we have a trailing item that doesn't match stack delimeter void trailingItem(nodePtr newItem) //displays what doesn't match { cout << "\" " << top->token << " \" on line " << setw(5) << right; cout << top->lineNumber << " doesn't match \" " << newItem->token; cout << " \" on line " << setw(5) << right << newItem->lineNumber; } }; </code></pre> Here is the a.exe.stackdump file: <pre><code>Exception: STATUS_ACCESS_VIOLATION at eip=00401701 eax=61100049 ebx=0028CD40 ecx=00A01998 edx=00000000 esi=0028CD40 edi=00000000 ebp=0028CD18 esp=0028CAF0 program=C:\Users\Tyler\Desktop\Program 2\a.exe, pid 5772, thread main cs=0023 ds=002B es=002B fs=0053 gs=002B ss=002B Stack trace: Frame Function Args 0028CD18 00401701 (00000001, 009E8628, 009E8510, 00000001) 0028CD68 61007038 (00000000, 0028CDA4, 61006980, 7EFDE000) End of stack trace </code></pre>
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<c++><windows>
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C++ STATUS_ACCESS_VIOLATION error when program runs
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1. USTyler Gavin
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