C++异常处理范例代码

概述C++异常处理范例代码

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// Program shows copying one text file from source location// to any other location (destination),plus possibility of changing its name,// and also shows many language features in exception handling.// This program should be run from the command prompt  #include<iostream>#include<stdio.h>#include<stdexcept>  using namespace std;  class PathError : public runtime_error{    public:        PathError(const char *x) : runtime_error(x)    {}};  // function to open source file for read  file* source (char* argvs[]){    file *in;    //open source file for read    if((in = fopen(argvs[1],"r"))==NulL)    {        throw PathError("attempted to open wrong input file path");//terminate function    }    return in;}  //function to create destination file for writtingfile* destination (char* argvs[]){    file *out;    //open destination file for write    if((out = fopen(argvs[2],"w")) == NulL)    {        throw PathError("attempted to open wrong output file path");//terminate function    }    return out;}  int main(int argc,char *argv[]){    file *in,*out;    bool flag = 1;    int temp;    while(argc == 3)    {        try        {            in = source( argv );            out = destination( argv );            argc = 0;        }        catch(PathError& PathError)        {            cerr <<"\nException occured: " << PathError.what() << endl;            return -1;        }          while(!feof(in))//test for it is not end of input file        {            temp = fgetc(in);//get char from (in)file            if( temp != EOF)            {                fputc(temp,out);//put char to (out) file            }        }        fclose(in);        fclose(out);        cout<<"\n\t 1 file copIEd.\n";        flag = 0;    }    if( flag != 0 )    {        cerr<<"\nWrong argument List!!!\n\n";        return -1;    }    return 0;}

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