.csv ファイルの内容を配列に読み取り、関数getNumberOfRooms()が呼び出されたときに結果を画面 (より大きなプロジェクトの一部) に出力するプログラムを作成しようとしています。値を返そうとすると例外がスローされます。変数のnumberOfRooms、クラス内のプライベート メンバー。誰かが以前にこのような問題を抱えていたり、この種の問題で誰かを助けたりしたことがありますか? もしそうなら、どのように解決しましたか？
前もって感謝します、
完全なソース コードはこちらから入手できます: https://bitbucket.org/skutov/micropuzzle/
getNumberOfRooms() が呼び出されたときにスローされる例外:
Unhandled exception at 0x01354aa6 in MICROPUZZLE.exe: 0xC0000005: Access violation
reading location 0xccccccd0.
これらは問題の関数です（変数は常にクラスで参照されます）
ClassMap::ClassMap ()
{
numberOfRooms = 0;
// Get number of rooms in map.csv
/* Find number of entries in map.csv file */
numberOfRooms = number_of_lines;
// allocate memory for rooms array
/* loading data from file into array */
}
}
// self explanitory
int ClassMap::getNumberOfRooms()
{
// Exception occurs on this line when accessing the variable
return numberOfRooms;
}
int ClassMap::printRoomDescriptions ()
{
for(int j = this->getNumberOfRooms(); j > 0; j--)
{
cout << roomArray[j].getDescription();
}
return 0;
}
クラスヘッダーは次のとおりです。
class ClassMap
{
private:
int currentLocation;
int numberOfRooms;
// pointer to array initialised in constructor
ClassRoom *roomArray;
public:
// Constructors and Destructors
ClassMap();
~ClassMap();
// Print description, events and directions for current room
std::string getCurrentRoom();
// Change currentLocation to neighbour of current room if possible
int moveRoom(char direction);
// self explanitory
int getNumberOfRooms();
// dump room descriptions to command line (debugging)
int printRoomDescriptions();
};
roomArray も初期化する ClassMap のコンストラクタを次に示します。
ClassMap::ClassMap ()
{
numberOfRooms = 0;
// Get number of rooms in map.csv
unsigned int number_of_lines = 0;
FILE *infile = fopen("map.csv", "r");
int ch;
while (EOF != (ch=getc(infile)))
if ('\n' == ch)
++number_of_lines;
fclose(infile);
numberOfRooms = number_of_lines;
// allocate memory for rooms array
roomArray = new ClassRoom[numberOfRooms+1];
// set starting room
int currentLocation = 1;
// load that shit up
{
// Holders for values read from file
int newRoomID = 0;
char newRoomDescription[79] = "";
int newRoomNorthNeighbour = 0;
int newRoomEastNeighbour = 0;
int newRoomSouthNeighbour = 0;
int newRoomWestNeighbour = 0;
// used for iterations
int i = 0;
// File stream for map.csv
std::ifstream mapFile;
// Crack that shit open
mapFile.open ("map.csv");
// Line buffer for parsing
std::string line;
// For each line in the map.csv file read in the values into variables declared above then run initialise function for each room to store values into array
while (std::getline(mapFile, line))
{
// re-init parameters
newRoomID = 0;
newRoomNorthNeighbour = 0;
newRoomEastNeighbour = 0;
newRoomSouthNeighbour = 0;
newRoomWestNeighbour = 0;
for(i = 0;i<79;i++)
{
newRoomDescription[i] = ' ';
}
int parameter = 0;
int paraStart = 0;
int paraEnd = 0;
std::string buffer;
std::istringstream iss(line);
for(parameter = 0; parameter <= 5; parameter++)
{
// Empty buffer from last iteration
buffer.clear();
// Find end of current parameter
paraEnd = line.find(',',paraStart+1);
switch (parameter)
{
case 0:
buffer = line.substr((paraStart),(paraEnd-paraStart));
newRoomID = atoi(buffer.c_str());
break;
case 1:
buffer = line.substr((paraStart+2),(line.find("\"",paraStart+2)-(paraStart+2)));
for(i = 0;i<(buffer.length());i++)
{
newRoomDescription[i] = buffer.c_str()[i];
}
//newRoomDescription
break;
case 2:
buffer = line.substr((paraStart+1),(paraEnd-paraStart));
newRoomNorthNeighbour = atoi(buffer.c_str());
break;
case 3:
buffer = line.substr((paraStart+1),(paraEnd-paraStart));
newRoomEastNeighbour = atoi(buffer.c_str());
break;
case 4:
buffer = line.substr((paraStart+1),(paraEnd-paraStart));
newRoomSouthNeighbour = atoi(buffer.c_str());
break;
case 5:
buffer = line.substr((paraStart+1),(paraEnd-paraStart));
newRoomWestNeighbour = atoi(buffer.c_str());
break;
} // switch
// Cycle paraEnd to paraStart
paraStart = paraEnd;
} // for parameters loop
// Init next room with data
new (&roomArray[newRoomID]) ClassRoom( newRoomNorthNeighbour,
newRoomEastNeighbour,
newRoomSouthNeighbour,
newRoomWestNeighbour,
newRoomDescription);
} // while !EOF
// Close the file because we're a good little program and we don't need that shit no more
mapFile.close();
}
}