Databases
StackOverflow2013
Postsdbo
POWhat am I doing wrong with my serializing a vector with structs in it to a .dat file?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhat am I doing wrong with my serializing a vector with structs in it to a .dat file?
    primarykey
    data
    text
    <p>If I type in </p> <p>Description: Apple</p> <p>Quantity: 10</p> <p>Wholesale Cost: 30</p> <p>Retail Cost: 20</p> <p>Date Added: December</p> <p>These are the contents in my .dat file:</p> <p><strong>1Apple103020December</strong></p> <p>But when I load my program, it doesn't load the struct back in correctly resulting in there being 0 items in my list. Is that what it is suppose to look like or am I doing something seriously wrong.</p> <p>Code:</p> <pre><code>#include "stdafx.h" #include &lt;iostream&gt; #include &lt;fstream&gt; #include &lt;string&gt; #include &lt;vector&gt; using namespace System; using namespace std; #pragma hdrstop bool isValidChoice(int size, int choice); template&lt;typename T&gt; void writeVector(ofstream &amp;out, const vector&lt;T&gt; &amp;vec); template&lt;typename T&gt; vector&lt;T&gt; readVector(ifstream &amp;in); template&lt;typename T&gt; vector&lt;T&gt; addItem(vector&lt;T&gt; &amp;vec); template&lt;typename T&gt; void printItemDescriptions(vector&lt;T&gt; &amp;vec); template&lt;typename T&gt; int displayRecord(vector&lt;T&gt; &amp;vec); struct InventoryItem { string Description; int Quantity; int wholesaleCost; int retailCost; string dateAdded; } ; int main(void) { cout &lt;&lt; "Welcome to the Inventory Manager extreme! [Version 1.0]" &lt;&lt; endl; ifstream in("data.dat"); if (in.is_open()) { cout &lt;&lt; "File \'data.dat\' has been opened successfully." &lt;&lt; endl; } else { cout &lt;&lt; "Error opening data.dat" &lt;&lt; endl;} cout &lt;&lt; "Loading data..." &lt;&lt; endl; vector&lt;InventoryItem&gt; structList = readVector&lt;InventoryItem&gt;( in ); cout &lt;&lt;"Load complete." &lt;&lt; endl &lt;&lt; endl; in.close(); while (1) { string line = ""; cout &lt;&lt; "There are currently " &lt;&lt; structList.size() &lt;&lt; " items in memory."; cout &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "Commands: " &lt;&lt; endl; cout &lt;&lt; "1: Add a new record " &lt;&lt; endl; cout &lt;&lt; "2: Display a record " &lt;&lt; endl; cout &lt;&lt; "3: Edit a current record " &lt;&lt; endl; cout &lt;&lt; "4: Delete a record " &lt;&lt; endl; cout &lt;&lt; "5: Save current information " &lt;&lt; endl; cout &lt;&lt; "6: Exit the program " &lt;&lt; endl; cout &lt;&lt; endl; cout &lt;&lt; "Enter a command 1-6: "; getline(cin , line); int rValue = atoi(line.c_str()); system("cls"); ofstream out("data.dat"); switch (rValue) { case 1: addItem(structList); break; case 2: displayRecord(structList); break; case 3: break; case 4: break; case 5: if (!structList.size()) { cout &lt;&lt; "There are no items to save! Enter one first!" &lt;&lt; endl &lt;&lt; endl; system("pause"); system("cls"); break; } writeVector(out , structList); break; case 6: return 0; default: cout &lt;&lt; "Command invalid. You can only enter a command number 1 - 6. Try again. " &lt;&lt; endl; } out.close(); } system("pause"); return 0; } template&lt;typename T&gt; void writeVector(ofstream &amp;out, const vector&lt;T&gt; &amp;vec) { out &lt;&lt; vec.size(); for(vector&lt;T&gt;::const_iterator i = vec.begin(); i != vec.end(); i++) { out &lt;&lt; *i; } cout &lt;&lt; "Save completed!" &lt;&lt; endl &lt;&lt; endl; } ostream &amp;operator&lt;&lt;(ostream &amp;out, const InventoryItem &amp;i) { out &lt;&lt; i.Description; out &lt;&lt; i.Quantity; out &lt;&lt; i.wholesaleCost &lt;&lt; i.retailCost; out &lt;&lt; i.dateAdded; return out; } istream &amp;operator&gt;&gt;(istream &amp;in, InventoryItem &amp;i) { in &gt;&gt; i.Description; in &gt;&gt; i.Quantity; in &gt;&gt; i.wholesaleCost &gt;&gt; i.retailCost; in &gt;&gt; i.dateAdded; return in; } template&lt;typename T&gt; vector&lt;T&gt; readVector(ifstream &amp;in) { size_t size; if (in.fail()) { in &gt;&gt; size; } else { size = 0; } vector&lt;T&gt; vec; vec.reserve(size); for(unsigned int i = 0; i &lt; size; i++) { T tmp; in &gt;&gt; tmp; vec.push_back(tmp); } return vec; } template&lt;typename T&gt; vector&lt;T&gt; addItem(vector&lt;T&gt; &amp;vec) { system("cls"); string word; unsigned int number; InventoryItem newItem; cout &lt;&lt; "-Add a new item-" &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "Enter the description for the item: "; getline (cin , word); newItem.Description = word; cout &lt;&lt; endl; cout &lt;&lt; "Enter the quantity on hand for the item: "; getline (cin , word); number = atoi(word.c_str()); newItem.Quantity = number; cout &lt;&lt; endl; cout &lt;&lt; "Enter the Retail Cost for the item: "; getline (cin , word); number = atoi(word.c_str()); newItem.retailCost = number; cout &lt;&lt; endl; cout &lt;&lt; "Enter the Wholesale Cost for the item: "; getline (cin , word); number = atoi(word.c_str()); newItem.wholesaleCost = number; cout &lt;&lt; endl; cout &lt;&lt; "Enter current date: "; getline (cin , word); newItem.dateAdded = word; vec.push_back(newItem); return vec; } template&lt;typename T&gt; void printItemDescriptions(vector&lt;T&gt; &amp;vec) { int size = vec.size(); if (size) { cout &lt;&lt; "---------------------------------" &lt;&lt; endl; cout &lt;&lt; "| ~ Item Descriptions ~ |" &lt;&lt; endl; cout &lt;&lt; "---------------------------------" &lt;&lt; endl; cout &lt;&lt; "*********************************" &lt;&lt; endl; for (int i = 0 ; i &lt; size ; i++) { cout &lt;&lt; "(" &lt;&lt; i+1 &lt;&lt; ")" &lt;&lt; ": " &lt;&lt; vec[i].Description &lt;&lt; endl; } cout &lt;&lt; "*********************************" &lt;&lt; endl &lt;&lt; endl; } } template&lt;typename T&gt; int displayRecord(vector&lt;T&gt; &amp;vec) { string word = ""; string quit = "quit"; int choice = 1; int size = vec.size(); if (size) { printItemDescriptions(vec); cout &lt;&lt; endl; while (1) { cout &lt;&lt; "Type \"exit\" to return to the Main Menu." &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "Enter \"list\" to re-display the items." &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; endl; cout &lt;&lt; "Pick the number of the item you would like to display: "; getline (cin , word); if (convertToLower(word) == "exit") { system("cls"); return 0; } if (convertToLower(word) == "list") { system("cls"); displayRecord(vec); } choice = atoi(word.c_str()); if (isValidChoice(size, choice)) { system("cls"); cout &lt;&lt; endl &lt;&lt; "[Item (" &lt;&lt; choice &lt;&lt; ") details] " &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "******************" &lt;&lt; endl; cout &lt;&lt; "* Description * " &lt;&lt; vec[choice-1].Description &lt;&lt; endl; cout &lt;&lt; "******************" &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "******************" &lt;&lt; endl; cout &lt;&lt; "*Quantity On Hand* " &lt;&lt; vec[choice-1].Quantity &lt;&lt; endl; cout &lt;&lt; "******************" &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "******************" &lt;&lt; endl; cout &lt;&lt; "* Wholesale Cost * " &lt;&lt; vec[choice-1].wholesaleCost &lt;&lt; endl; cout &lt;&lt; "****************** " &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "******************" &lt;&lt; endl; cout &lt;&lt; "* Retail Cost * " &lt;&lt; vec[choice-1].retailCost &lt;&lt; endl; cout &lt;&lt; "****************** " &lt;&lt; endl &lt;&lt; endl; cout &lt;&lt; "******************" &lt;&lt; endl; cout &lt;&lt; "* Data Added * " &lt;&lt; vec[choice-1].dateAdded &lt;&lt; endl; cout &lt;&lt; "****************** " &lt;&lt; endl &lt;&lt; endl; } else { system("cls"); cout &lt;&lt; "That item doesn't exist!" &lt;&lt; endl; cout &lt;&lt; "Pick another item or enter \"list\" to see available items." &lt;&lt; endl &lt;&lt; endl; } } } else { cout &lt;&lt; "There are currently no items to display." &lt;&lt; endl &lt;&lt; endl; system("pause"); system("cls"); return 0; } return 1; } bool isValidChoice(int size, int choice) { for (int i = 0 ; i &lt;= size ; i++) { if (choice == size) { return true; } } return false; } string convertToLower(string word) { for (unsigned int i = 0 ; i &lt; word.size() ; i++) { word[i] = tolower(word[i]); } return word; } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USOneShot
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POWhat am I doing wrong with my serializing a vector with structs in it to a .dat file?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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