[英]Writing data with ofstream crash C++
我正在使用的IDE(Visual Studio 2012)沒有顯示任何錯誤或警告,但我基本上是在嘗試將二進制數據寫入名為wizdata.bin的文件中,並且我聲明了Wizard類的一些對象。 該向導類具有幾個具有4個成員變量(1個字符串和3個整數)的函數。 當我在向導類中調用名為“保存”的函數時,控制台程序停止工作,但是它確實設法寫入了向導類成員變量名稱,即字符串。 之后,它將無法寫入該類中的任何int。 所以問題是,嘗試將int寫入二進制文件時我做錯了什么? 在Wizard.cpp中被推薦的部分導致了崩潰。
這是我的代碼文件:
Wizard.h:
#ifndef WIZARD_H
#define WIZARD_H
#include <string>
#include <fstream>
class Wizard
{
public:
Wizard();
Wizard( std::string name, int hp, int mp, int armor );
void print();
void save( std::ofstream& outFile );
void load( std::ifstream& inFile );
private:
std::string name;
int hitPoints;
int magicPoints;
int armor;
};
#endif
Wizard.cpp:
#include "Wizard.h"
#include <iostream>
using namespace std;
Wizard::Wizard()
{
name = "Default";
hitPoints = 0;
magicPoints = 0;
armor = 0;
}
Wizard::Wizard( string name, int hp, int mp, int armor )
{
this->name = name;
hitPoints = hp;
magicPoints = mp;
this->armor = armor;
}
void Wizard::print()
{
cout << "Name= " << name << endl;
cout << "HP= " << hitPoints << endl;
cout << "MP= " << magicPoints << endl;
cout << "Armor= " << armor << endl;
cout << endl;
}
void Wizard::save( ofstream& outFile )
{
outFile.write( name.c_str(), name.size() );
//outFile.write( (char*)hitPoints, sizeof(hitPoints) );
//outFile.write( (char*)magicPoints, sizeof(magicPoints) );
//outFile.write( (char*)armor, sizeof(armor) );
}
void Wizard::load( ifstream& inFile )
{
inFile.read( (char*)name.c_str(), name.size() );
inFile.read( (char*)&hitPoints, sizeof(hitPoints) );
inFile.read( (char*)&magicPoints, sizeof(magicPoints) );
inFile.read( (char*)&armor, sizeof(armor) );
}
和Main.cpp:
#include "Wizard.h"
using namespace std;
int main()
{
Wizard wiz0( "Gandalf", 25, 100, 10 );
Wizard wiz1( "Loki", 50, 150, 12 );
Wizard wiz2( "Magius", 10, 75, 6 );
ofstream outFile;
outFile.open( "wizdata.bin", ios_base::binary );
if( outFile )
{
wiz0.save( outFile );
wiz1.save( outFile );
wiz2.save( outFile );
outFile.close();
}
return 0;
}
這是第二個加載數據的控制台應用程序的“ Main.cpp”:
#include "Wizard.h"
#include <iostream>
using namespace std;
int main()
{
Wizard wiz0;
Wizard wiz1;
Wizard wiz2;
cout << "BEFORE LOADING..." << endl;
wiz0.print();
wiz1.print();
wiz2.print();
ifstream inFile;
inFile.open( "wizdata.bin", ios_base::binary );
if( inFile )
{
wiz0.load( inFile );
wiz1.load( inFile );
wiz2.load( inFile );
inFile.close();
}
cout << "AFTER LOADING..." << endl;
wiz0.print();
wiz1.print();
wiz2.print();
return 0;
}
加載數據后,這些值為以下值:名稱:Gandalf HP:25 MP:100護甲:10
名稱:Loki2生命值:38400 MP:3072護甲:1734429952
名稱:ius HP:75 MP:6護甲:0
簡短答案:
使用移位運算符“ <<”而不是write()。
一點點更長的答案:
問題是演員。 (char *)number將數字解釋為指針,它當然不能指向任何有意義的東西。
write的第一個參數應該是指向要寫入的數據的指針。 所以試試這個:
outFile.write( (char*)&hitPoints, sizeof(hitPoints) );
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