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C++异常处理的几种方法

#include<cstdio>
class BadSrcFile{};
class BadDestFile{};
class BadCopy{};

int myCp(const char* destFile,const char* srcFile)
{
   FILE* inFile;
   if((inFile=fopen(srcFile,"rb"))==0)
   {
      return 1;
   }
   FILE* outFile;
   if((outFile=fopen(destFile,"wb"))==0)
   {
      return 2;
   }
   char buf[20];
   size_t inSize;
   size_t outSize;
   while((inSize=fread(buf,sizeof(char),20,inFile))!=0)
   {
      outSize=fwrite(buf,sizeof(char),inSize,outFile);
      if(outSize!=inSize)
      {
         return 3;
      }  
   }
   fclose(inFile);
   fclose(outFile);
return 0;
}

int myCp2(const char* destFile,const char* srcFile)
{
   FILE* inFile;
   if((inFile=fopen(srcFile,"rb"))==0)
   {
     // return 1;
     throw 1;
   }
   FILE* outFile;
   if((outFile=fopen(destFile,"wb"))==0)
   {
    //  return 2;
     throw 2;
   }
   char buf[20];
   size_t inSize;
   size_t outSize;
   while((inSize=fread(buf,sizeof(char),20,inFile))!=0)
   {
      outSize=fwrite(buf,sizeof(char),inSize,outFile);
      if(outSize!=inSize)
      {
        // return 3;
        throw 3;
      }  
   }
   fclose(inFile);
   fclose(outFile);
return 0;
}

void myCp3(const char* destFile,const char* srcFile)
{
   FILE* inFile;
   if((inFile=fopen(srcFile,"rb"))==0)
   {
     // return 1;
     throw "打开输入文件时出错!\n";
   }
   FILE* outFile;
   if((outFile=fopen(destFile,"wb"))==0)
   {
    //  return 2;
     throw "打开输出文件时出错!\n";
   }
   char buf[20];
   size_t inSize;
   size_t outSize;
   while((inSize=fread(buf,sizeof(char),20,inFile))!=0)
   {
      outSize=fwrite(buf,sizeof(char),inSize,outFile);
      if(outSize!=inSize)
      {
        // return 3;
        throw "拷贝时出错!\n";
      }  
   }
   fclose(inFile);
   fclose(outFile);
}

void myCp4(const char* destFile,const char* srcFile)
{
   FILE* inFile;
   if((inFile=fopen(srcFile,"rb"))==0)
   {
     // return 1;
     //throw "打开输入文件时出错!\n";
       throw BadSrcFile();
   }
   FILE* outFile;
   if((outFile=fopen(destFile,"wb"))==0)
   {
    //  return 2;
    // throw "打开输出文件时出错!\n";
       throw BadDestFile();
   }
   char buf[20];
   size_t inSize;
   size_t outSize;
   while((inSize=fread(buf,sizeof(char),20,inFile))!=0)
   {
      outSize=fwrite(buf,sizeof(char),inSize,outFile);
      if(outSize!=inSize)
      {
        // return 3;
       // throw "拷贝时出错!\n";
        throw BadCopy();
      }  
   }
   fclose(inFile);
   fclose(outFile);
}
int main()
{
   int result= myCp("11.txt","1.txt");
   int result1;
   switch(result)
   {
    case 0:printf("正常拷贝1!\n");break;
    case 1:printf("打开输入文件时出错1!\n");break;
    case 2:printf("打开输出文件时出错1!\n");break;
    case 3:printf("拷贝时出错1!\n");break;
    default:printf("未知错误1!\n");break;
   }
  try{
      result=myCp2("22.txt","1.txt");
      myCp3("33.txt","1.txt");
      myCp4("44.txt","1.txt");
   }
   catch(int e){
	switch(e)
        {
          case 1:printf("打开输入文件时出错2!\n");break;
          case 2:printf("打开输出文件时出错2!\n");break;
          case 3:printf("拷贝时出错2!\n");break;
          default:printf("未知错误2!\n");break;
        }
    }
    catch(const char* e)
    {
      printf("%s\n",e);
    }
    catch(BadSrcFile e)
    {
      printf("打开输入文件时出错!\n");
    }
    catch(BadDestFile e)
    {
      printf("打开输出文件时出错!\n");
    }
    catch(BadCopy e)
    {
      printf("拷贝时出错!\n");
    }
    catch(...)
    {
      printf("未知错误!\n");
    }
   printf("OK!\n");
return 0;
}