#include <iostream>
using namespace std;
//传统异常处理
int copyfile(char *from, char * to)
{
if (from==NULL)
{
cout<<""<<endl;
return 1;
}
if (to == NULL)
{
return 2;
}
if (*from == 'a')
{
return 3;
}
while(*from!='\0')
{
*to = *from;
to++;
from++;
}
*to = '\0';
return 0;
}
int main00()
{
char buf1[]="sbcdefghgjkl";
char buf2[1024];
int ret = copyfile(buf1,buf2);
switch (ret)
{
case 1:
cout<<"源出错"<<endl;
break;
case 2:
cout<<"目的出错"<<endl;
break;
case 3:
cout<<"过程出错"<<endl;
break;
default:
cout<<"未知异常"<<endl;
break;
}
printf("buf2:\n",buf2);
system("pause");
return 0;
}
//throw抛异常
void copyfile2(char *from, char * to)
{
if (from==NULL)
{
throw 1;
}
if (to == NULL)
{
throw 2;
}
if (*from == 'a')
{
throw 3;
}
while(*from!='\0')
{
*to = *from;
to++;
from++;
}
*to = '\0';
}
//char*异常
void copyfile3(char *from, char * to)
{
if (from==NULL)
{
throw "源异常";
}
if (to == NULL)
{
throw "目的异常";
}
if (*from == 'a')
{
throw "过程异常";
}
while(*from!='\0')
{
*to = *from;
to++;
from++;
}
*to = '\0';
}
class BadSrc
{};
class Badto{};
class BadPro
{
public:
BadPro()
{
cout<<"BadPro构造函数"<<endl;
}
~BadPro()
{
cout<<"BadPro析构函数"<<endl;
}
BadPro(const BadPro &obj)
{
cout<<"BadPro拷贝构造函数"<<endl;
}
};
//char*异常
void copyfile4(char *from, char * to)
{
if (from==NULL)
{
throw BadSrc();
}
if (to == NULL)
{
throw Badto();
}
if (*from == 'a')
{
throw BadPro();
}
if (*from == 'b')
{
throw new BadPro();
}
while(*from!='\0')
{
*to = *from;
to++;
from++;
}
*to = '\0';
}
int main()
{
char buf1[]="bbcdefghgjkl";
char buf2[1024];
try
{
copyfile4(buf1,buf2);
}
catch (int e)
{
cout<<"int星异常"<<endl;
}
catch (char* p)
{
cout<<"char*异常:"<<p<<endl;
}
catch (BadSrc e)
{
cout<<"BadSrc异常:"<<endl;
}
catch (Badto e)
{
cout<<"Badto异常:"<<endl;
}
//结论2：使用引用 会使用throw时的对象 调用一次构造函数
catch (BadPro &e)
{
cout<<"BadPro &异常:"<<endl;
}
/* //结论1：如果 接收异常使用异常变量 则调用拷贝构造函数
catch (BadPro e)//是把匿名对象拷贝给e 还是e就是那个匿名对象
{
cout<<"BadPro异常:"<<endl;
}*/
//结论3：使用指针接收异常 必须手动释放内存
//结论4：使用指针接收异常可以同时和元素 引用类型接收异常写在一块 但是引用接收异常不能同时和使用元素写在一块
catch (BadPro *e)
{
delete e;
cout<<"BadPro *异常:"<<endl;
}
catch (...)
{
cout<<"未知异常"<<endl;
}
printf("buf2:\n",buf2);
system("pause");
return 0;
}
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