Databases
StackOverflow2013
Postsdbo
POIncorrect allocation of memory with an array of structures
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIncorrect allocation of memory with an array of structures
    primarykey
    data
    text
    <p>I have posted this problem before but I cannot seem to find a solution. So I am posting again with refined description in hopes of solving this problem. Your help is much appreciated.</p> <p>What I would like to do is read in a row from a text file. This text file contains 3 types of rows: </p> <ol> <li>A row containing the word "start" indicating the start of a particular test case result</li> <li>Rows containing the word PASS or FAIL or PWU or FWU and accompanying data</li> <li>A row containing the word "stop" indicating the end of a test case result</li> </ol> <p>The trouble I am having is with <code>dataRowPointer</code>. <code>dataRowPointer</code> is an array of struct. It's pointer was declared in the main function, and it was passed into the following function by reference.</p> <p>When I call <code>*dataRowPointer = new DataRow[MAX_NUMBER_DATA_ROWS_PER_TEST_CASE_SET];</code>, I can see in the debugger that the first array element, dataRowPointer[0] was properly allocated in memory. However the second, third and all other elements were not properly allocated because the debugger displays them as 0xcccccccc in memory.</p> <p>This is affecting my other function call <code>getDataRow( line, loc, tcsPointer, dataRowPointer );</code> which contains lines similar to <code>(*dataRowPointer)[dataRowIndex].tcSetNum = testCaseSetID;</code> .</p> <pre><code>void getRow( std::istream&amp; myfile, HeaderLocations* loc, TestCaseSet* tcsPointer, DataRow** dataRowPointer ) { std::string line; std::string word; int currentLoc = 0; bool startStop = true; std::getline( myfile, line); std::stringstream sline(line); while ( sline &gt;&gt; word ) { if ( word == "PASS" || word == "PWU" || word == "FWU" || word == "FAIL" ) { startStop = false; break; } else if( word == "start" ) { dataRowIndex = 0; *dataRowPointer = new DataRow[MAX_NUMBER_DATA_ROWS_PER_TEST_CASE_SET]; initializeDataRowPointer( dataRowPointer ); testCaseSetID = captureTestCaseSetNumber( line, tcsPointer ); getHeaderRow( myfile, loc ); startStop = true; break; } else if ( word == "stop" ) { tcsNumber++; *dataRowPointer = NULL; startStop = true; break; } else { startStop = false; } } if( !startStop ) { (*dataRowPointer)[dataRowIndex].tcSetNum = testCaseSetID; getDataRow( line, loc, tcsPointer, dataRowPointer ); dataRowIndex++; } } </code></pre> <p>Any help would be greatly appreciated.</p> <p>Note: I understand my code is fragile ( what if text document doesn't have start, or stop or etc), and it contains bad code (use of global variables, etc). But please I just want to solve this problem first before moving on. And please try to ignore the <code>*dataRowPointer = NULL;</code> within the <code>else if</code> statement, I will change this to something much more useful once this bug is fixed.</p> <p><strong>EDIT</strong> As requested the code for struct DataRow and the code for function InitializeDataRowPointer:</p> <p>DataRow:</p> <pre><code>struct DataRow { std::string tcSetNum; std::string class_PassFail; std::string rfPort; float temp; float margin; }; </code></pre> <p>InitializeDataRowPointer:</p> <pre><code>void initializeDataRowPointer( DataRow** dataRowPointer ) { DataRow newDataRow = {"a", "a", "a", 0.0, 0.0 }; for ( int i = 0; i &lt; MAX_NUMBER_DATA_ROWS_PER_TEST_CASE_SET; i++ ) { (*dataRowPointer)[i] = newDataRow; } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USSplaty
    1. USSplaty
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POIncorrect allocation of memory with an array of structures
      1. This table or related slice is empty.
      1. VTDownMod
    2. VO
      singulars
      1. POIncorrect allocation of memory with an array of structures
      1. This table or related slice is empty.
      1. VTDownMod
    1. COPlease show: class definition and default constructor for `DataRow`, definition of `initializeDataRowPointer`.
      singulars
      1. POIncorrect allocation of memory with an array of structures
      1. USzwol
    2. CO@Zack Please see edit
      singulars
      1. POIncorrect allocation of memory with an array of structures
      1. USSplaty
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload